LD39020

Datasheet

200 mA very low quiescent current linear regulator IC

Features
• Input voltage from 1.5 to 5.5 V
• Ultra low dropout voltage (200 mV typ. at 200 mA load)
• Very low quiescent current (20 µA typ at no load, 0.03 µA typ in off mode)
DFN4 1x1 SOT23-5L • Output voltage tolerance: ± 0.5 % (A version) or ± 2.0 % @ 25 °C (standard
version)
• 200 mA guaranteed output current
• High PSRR (80 dB@1 kHz, 50 db@100 kHz)
• Wide range of output voltages available on request: from 0.8 V up to 5.0 V in 50
mV step
• Logic-controlled electronic shutdown
• Internal soft-start
• Optional output voltage discharge feature
• Compatible with ceramic capacitor COUT = 0.47 µF
• Internal current limit and thermal protections
• Available in DFN4 1x1 and SOT23-5L packages
• Operating temperature range: -40 °C to 125 °C

Applications
• Mobile phones
• Tablets
Maturity status link
• Digital still cameras (DSC)
LD39020 • Cordless phones and similar battery-powered systems
• Portable media players

Description
The LD39020 high accuracy voltage regulator provides 200 mA of maximum current
from an input voltage ranging from 1.5 V to 5.5 V, with a typical dropout voltage of
200 mV.
It is available in DFN4 1x1 and SOT23-5L packages, allowing the maximum space
saving.
The device is stabilized with a ceramic capacitor on the output. The ultra low drop
voltage, low quiescent current and low noise features, together with the internal soft-
start circuit, make the LD39020 suitable for low power battery-operated applications.
An enable logic control function puts the LD39020 in shutdown mode allowing a total
current consumption lower than 0.1 µA. Constant current and thermal protection are
provided.

DS9956 - Rev 5 - January 2019 www.st.com

For further information contact your local STMicroelectronics sales office.
 LD39020
Diagram

1 Diagram

Figure 2. Block diagram

VIN VOUT

Bias
generator
OPAMP

EN
Enable
Thermal
protection

Bandgap
reference *

GND

AM13852V1

Note: The output discharge MOSFET is optional.

DS9956 - Rev 5 page 2/30

 LD39020
Pin configuration

2 Pin configuration

Figure 3. Pin connection (top view)

Table 1. Pin description

Pin DFN4 1x1 Pin SOT23-5L Symbol Function

1 5 OUT Output voltage

2 2 GND Common ground
Enable pin logic input: Low = shutdown,
3 3 EN
High = active
4 1 IN Input voltage
Thermal pad - GND Connect to GND on the PCB
- 4 NC Not internally connected

DS9956 - Rev 5 page 3/30

 LD39020
Typical application

3 Typical application

Figure 4. Typical application circuits

LD39020

DS9956 - Rev 5 page 4/30

 LD39020
Maximum ratings

4 Maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

VIN Input voltage - 0.3 to 7 V

VOUT Output voltage - 0.3 to VIN + 0.3 V

VEN Enable input voltage - 0.3 to 7 V

IOUT Output current Internally limited mA

PD Power dissipation Internally limited mW

TSTG Storage temperature range - 40 to 150 °C

TOP Operating junction temperature range - 40 to 125 °C

Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional
operation under these conditions is not implied. All values are referred to GND.

Table 3. Thermal data

Symbol Parameter Value Unit

RthJA Thermal resistance junction-ambient, DFN4 1x1 250 °C/W

RthJC Thermal resistance junction-case, SOT23-5L 81 °C/W

RthJA Thermal resistance junction-ambient, SOT23-5L 255 °C/W

Table 4. ESD performance

Symbol Parameter Test conditions Value Unit

HBM 4 kV
ESD ESD Protection voltage MM 400 V
CDM 500 V

DS9956 - Rev 5 page 5/30

 LD39020
Electrical characteristics

5 Electrical characteristics

TJ = 25 °C, VIN = VOUT(NOM) + 1 V , CIN = COUT = 1 µF, IOUT = 1 mA, VEN = VIN, unless otherwise specified.

Table 5. Electrical characteristics for LD39020T, LD39020DT

Symbol Parameter Test conditions Min. Typ. Max. Unit

VIN Operating input voltage 1.5 5.5 V

IOUT = 1 mA, TJ = 25 °C -2 2 %
VOUT VOUT accuracy IOUT = 1 mA,
-3 3 %
-40 °C < TJ < 125 °C

VOUT(NOM) + 1 V ≤ VIN ≤ 5.5 V,

0.02 %/V
∆VOUT Static line regulation (1) IOUT = 10 mA

-40 °C < TJ < 125 °C 0.2

IOUT = 0 mA to 200 mA 10 mV
∆VOUT Static load regulation
-40 °C < TJ < 125 °C 0.01 %/mA

IOUT = 30 mA,VOUT = 2.8 V 35

VDROP Dropout voltage IOUT = 200 mA, VOUT = 2.8 V mV
200 350
-40 °C < TJ < 125 °C

10 Hz to 100 kHz, µVRMS/

eN Output noise voltage 45
IOUT = 10 mA VOUT

VIN = VOUT(NOM)+ 1 V +/- VRIPPLE

VRIPPLE = 0.2 V
80
Freq. = 1 kHz
SVR Supply voltage rejection IOUT = 30 mA dB

VIN = VOUT(NOM)+ 1 V +/- VRIPPLE,

VRIPPLE = 0.2 V 55
Freq. = 100 kHz, IOUT = 30 mA

IOUT = 0 mA 20 40
IQ Quiescent current µA
IOUT = 200 mA 100

VIN input current in OFF MODE:

IStandby Standby current 0.03 1 µA
VEN = GND

ISC Short circuit current RL = 0 250 350 mA

Output voltage discharge

RON (only on LD39020DT) 100 Ω
MOSFET
VIN = 1.5 V to 5.5 V
Enable input logic low 0.4
-40 °C < TJ < 125 °C
VEN V
VIN = 1.5 V to 5.5 V
Enable input logic high 1
-40 °C < TJ< 125 °C

IEN Enable pin input current VEN = VIN 100 nA

TON (2)
Turn on time 100 µs

DS9956 - Rev 5 page 6/30

 LD39020
Electrical characteristics

Symbol Parameter Test conditions Min. Typ. Max. Unit

Thermal shutdown 160

TSHDN °C
Hysteresis 20
Capacitance see
COUT Output capacitor Figure 18. Stability area vs. (COUT, 0.47 22 µF
ESR)

1. Not applicable for Vout(nom) > 4.5 V

2. Turn-on time is time measured between the enable input just exceeding VEN high value and the output voltage just reaching
95 % of its nominal value

TJ = 25 °C, VIN = VOUT(NOM) + 1 V , CIN = COUT = 1 µF, IOUT = 1 mA, VEN = VIN, unless otherwise specified.

Table 6. Electrical characteristics for LD39020AT, LD39020ADT

Symbol Parameter Test conditions Min. Typ. Max. Unit

VIN Operating input voltage 1.5 5.5 V

IOUT = 1 mA, TJ = 25 °C -0.5 0.5 %

VOUT VOUT accuracy IOUT = 1 mA,
-1.5 1.5 %
-40 °C < TJ < 125 °C

VOUT(NOM) + 1 V ≤ VIN ≤ 5.5 V,

0.02 %/V
∆VOUT Static line regulation(1) IOUT = 10 mA

-40 °C < TJ < 125 °C 0.2

IOUT = 0 mA to 200 mA 10 mV
∆VOUT Static load regulation
-40 °C < TJ < 125 °C 0.01 %/mA

IOUT = 30 mA, VOUT = 2.8 V 35

VDROP Dropout voltage IOUT = 200 mA, VOUT = 2.8 V mV
200 350
-40 °C < TJ < 125 °C

10 Hz to 100 kHz, µVRMS /

eN Output noise voltage 45
IOUT = 10 mA VOUT

VIN = VOUT(NOM)+ 1 V +/- VRIPPLE

VRIPPLE = 0.2 V
80
Freq. = 1 kHz
SVR Supply voltage rejection IOUT = 30 mA dB

VIN = VOUT(NOM)+ 1 V +/- VRIPPLE,

VRIPPLE = 0.2 V 55
Freq. = 100 kHz, IOUT = 30 mA

IOUT = 0 mA 20 40
IQ Quiescent current µA
IOUT = 200 mA 100

VIN input current in OFF MODE:

IStandby Standby current 0.03 1 µA
VEN = GND

ISC Short circuit current RL = 0 250 350 mA

DS9956 - Rev 5 page 7/30

 LD39020
Electrical characteristics

Symbol Parameter Test conditions Min. Typ. Max. Unit

Output voltage discharge

RON (only on LD39020ADT) 100 Ω
MOSFET
VIN = 1.5 V to 5.5 V
Enable input logic low 0.4
-40 °C < TJ < 125 °C
VEN V
VIN = 1.5 V to 5.5 V
Enable input logic high 1
-40 °C < TJ < 125 °C

IEN Enable pin input current VEN = VIN 100 nA

TON (2) Turn on time 100 µs

Thermal shutdown 160 °C

TSHDN
Hysteresis 20
Capacitance see
COUT Output capacitor Figure 18. Stability area vs. (COUT, 0.47 22 µF
ESR)

1. Not applicable for Vout(nom) > 4.5 V

2. Turn-on time is time measured between the enable input just exceeding VEN high value and the output voltage just reaching
95 % of its nominal value

DS9956 - Rev 5 page 8/30

 LD39020
Application information

6 Application information

6.1 Soft-start function

The LD39020 has an internal soft start circuit. By increasing the startup time up to 100 µs, without the need of any
external soft start capacitor, this feature is able to keep the regulator inrush current at startup under control.

6.2 Output discharge function

The LD39020 integrates a MOSFET connected between VOUT and GND. This transistor is activated when the EN
pin goes to low logic level and has the function to quickly discharge the output capacitor when the device is
disabled by the user.
The device is available with or without auto-discharge feature.
See Table 10. DFN4 1x1 order code for more details.

6.3 Input and output capacitors

The LD39020 requires external capacitors to assure the regulator control loop stability.
Any good quality ceramic capacitor can be used but, the X5R and the X7R are suggested since they guarantee a
very stable combination of capacitance and ESR overtemperature.
Locating the input/output capacitors as closer as possible to the relative pins is recommended.
The LD39020 requires an input capacitor with a minimum value of 1 μF.
This capacitor must be located as closer as possible to the input pin of the device and returned to a clean analog
ground.
The control loop of the LD39020 is designed to work with an output ceramic capacitor.
This capacitor must meet the requirements of minimum capacitance and equivalent series resistance (ESR), as
shown in Figure 18. Stability area vs. (COUT, ESR). To assure stability, the output capacitor must maintain its ESR
and capacitance in the stable region, over the full operating temperature range.
The LD39020 shows stability with a minimum effective output capacitance of 220 nF.
However, to keep stability in all operating conditions (temperature, input voltage and load variations), a minimum
output capacitor of 0.47 µF is recommended.
The suggested combination of 1 μF input and output capacitors offers a good compromise among the stability of
the regulator, optimum transient response and total PCB area occupation.

DS9956 - Rev 5 page 9/30

 LD39020
Typical characteristics

7 Typical characteristics

(CIN = COUT = 1 µF, VEN to VIN, TJ = 25 °C unless otherwise specified)

Figure 5. Output voltage vs. temperature Figure 6. Output voltage vs. temperature
(IOUT = 1 mA) (IOUT = 200 mA)

3.4

3.38

3.36

3.34
Output Voltage [V]

Output Voltage [V]

3.32

3.3

3.28

3.26

3.24

3.22

3.2
-40 -25 0 25 55 85 125 -40 -25 0 25 55 85 125
Temperature [ °C] Temperature [ °C]

VIN = 4.3 V, IOUT = 1 mA VIN=4.3V, IOUT=200mA

AM13855V1 AM13856V1

Figure 7. Line regulation vs. temperature Figure 8. Load regulation vs. temperature
Line regulation [%/V]

Load regulation

-0.05

-0.15

Temperature [ °C]

VIN = 4.3 V to 5.5 V, IOUT = 10 mA

AM13857V1

DS9956 - Rev 5 page 10/30

 LD39020
Typical characteristics

Figure 9. Quiescent current vs. temperature Figure 10. Quiescent current vs. temperature
(IOUT = 0 mA) (IOUT = 200 mA)

50
200
45
180
40
160
35
Quiesce nt current [µA]

140

Quiescent current [µA]

30
120
25
100
20
80
15
60
10
40
5
20
0
-40 -25 0 25 55 85 125 0
Temperature [ °C] -40 -25 0 25 55 85 125
Temperature [ °C]
VIN = 4.3 V, IOUT = 0 mA VIN=4.3V, IOUT= 200mA
AM13859V1 AM13860V1

Figure 11. Shutdown current vs. temperature Figure 12. Quiescent current vs. load current

1 160

0.9
140
0.8
120
Quiescent curr ent [µA]

0.7
Quiescent current [µA]

100
0.6

0.5 80

0.4
60
0.3
40
0.2
20
0.1

0 0
-40 -25 0 25 55 85 125 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2
Temperature [°C]
Output current [A]
VIN = 4.3 V, VEN = GND VIN=2V, VOUT=1V
AM13861V1 AM13862V1

Figure 13. Quiescent current vs. input voltage Figure 14. Dropout voltage vs. temperature

100 275

90 250
Iout = 0 mA
225
80
Iout = 1 mA Iout = 30 mA
200
Quiescent current [µA]

70 Iout = 10 mA Iout = 50 mA
175 Iout = 100 mA
60
Iout = 200 mA
Dropout voltage [mV]

150
50
125
40
100
30
75
20 50
10 25

0 0
0 1 2 3 4 5 6 -40 -25 0 25 55 85 125
Temperature [ °C]
Input voltage [V]
V IN = 2 V, VOUT = 1 V

AM13863V1 AM13864V1

DS9956 - Rev 5 page 11/30

 LD39020
Typical characteristics

Figure 16. Supply voltage rejection vs. input

Figure 15. Supply voltage rejection vs. frequency
voltage

100
Iout = 1 mA 90
90 Iout = 30 mA
80
80 Iout = 100 mA
Iout = 200 mA
70
70

60 60
SVR [dB]

50 50

SVR [dB]
f = 1 kHz
40 40 f = 10 kHz
f = 100 kHz
30 30

20
20
10
10
0
100 1000 10000 100000 1000000 0
Frequency [Hz] 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Input voltage [V]
VIN = 2 V+/-200 mV, V OUT = 1 V, C OUT = 1 µF
IOUT = 30mA , V OUT = 1 V , C OUT = 1 µF
AM13865V1
AM13866V1

Figure 17. Output noise spectral density Figure 18. Stability area vs. (COUT, ESR)

4.0

Iout = 0 mA 1.4
3.5
Iout = 10 mA
1.2
3.0
ESR @100 KHz[Ω]

1
2.5
eN [uV / SQRT(Hz)]

0.8
2.0

1.5 0.6

STABILITY AREA
1.0 0.4

0.5 0.2

0.0 0
10 100 1000 10000 100000 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Frequency [Hz] C OUT [µF] (nominal value)

V IN = 2.0 V, V OUT = 1.0 V, C IN = C OUT = 1 µF VIN from 2 to 5.5 V, I OUT from 0 to 300 mA, C IN = 1 µF
AM13867V1 AM13868V1

Figure 19. Enable startup (VOUT = 1 V) Figure 20. Enable startup (VOUT = 5 V)

V EN
VEN

V OUT

VOUT

I OUT I OUT

VIN = 2 V, VEN = 0 V to VIN , IOUT = 0.2 A, VOUT = 1 V, Tr = 5 µs

VIN = 5.5 V, VEN = 0 V to 2 V, I OUT = 0.2 A, VOUT = 5 V, Tr = 5 µs

AM13869V1 AM13870V1

DS9956 - Rev 5 page 12/30

 LD39020
Typical characteristics

Figure 21. Turn-on time (VOUT = 1 V) Figure 22. Turn-off time (VOUT = 1 V)

VIN

VIN

VOUT

VOUT

I OUT

I OUT

V IN = VEN = from 0 V to 5.5 V, I OUT = 0.2 A, VOUT = 1 V, Tr = 5 µs VIN = V EN = from 5.5 V to 0 V, IOUT = 0.2 A, VOUT = 1 V, Tf = 5 µs

AM13871V1 AM13872V1

Figure 23. Turn-on time (VOUT = 5 V) Figure 24. Turn-off time (VOUT = 5 V)

VIN

VIN VOUT

IOUT
VOUT

I OUT

VIN = VEN = from 5.5 V to 0 V, I OUT = 0.2 A, VOUT = 5 V, Tf = 5 µs

VIN = VEN = from 0 V to 5.5 V, IOUT = 0.2 A, VOUT = 5 V, Tr = 5 µs

AM13873V1 AM13874V1

Figure 25. Line transient (VOUT = 1 V) Figure 26. Line transient (VOUT = 5 V)

VIN
VIN

VOUT

VOUT

VIN = VEN = from 2 V to 3 V, I OUT = 10 mA, VOUT = 1 V, Tr = Tf = 5 µs VIN = VEN = from 5.1 V to 5.5 V, IOUT = 10 mA, VOUT = 5 V, Tr =Tf = 5 µs

AM13875V1 AM13876V1

DS9956 - Rev 5 page 13/30

 LD39020
Typical characteristics

Figure 27. Load transient (VOUT = 1 V) Figure 28. Load transient (VOUT = 5 V)

I OUT
IOUT

VOUT

V OUT

VIN = VEN = 2 V, IOUT = from 0 to 0.2 A, VOUT = 1 V, tr = tf = 5 µs VIN = VEN = 5.5 V, IOUT = from 0 to 0.2 A, VOUT = 5 V, tr = tf = 5 µs

AM13877V1 AM13878V1

DS9956 - Rev 5 page 14/30

 LD39020
Package information

8 Package information

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK®
packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions
and product status are available at: www.st.com. ECOPACK® is an ST trademark.

DS9956 - Rev 5 page 15/30

 LD39020
DFN4 1x1 package info

8.1 DFN4 1x1 package info

Figure 29. DFN4 1x1 package outline

8405587_A

DS9956 - Rev 5 page 16/30

 LD39020
DFN4 1x1 package info

Table 7. DFN4 1x1 mechanical data

mm
Dim.
Min. Typ. Max.

A 0.34 0.37 0.40

A1 0 0.02 0.05
A3 0.10
b 0.17 0.22 0.27
D 0.95 1.00 1.05
D2 0.43 0.48 0.53
E 0.95 1.00 1.05
E2 0.43 0.48 0.53
e 0.65
L 0.20 0.25 0.30
K 0.15

DS9956 - Rev 5 page 17/30

 LD39020
DFN4 1x1 package info

Figure 30. DFN4 1x1 recommended footprint

8405587_A

DS9956 - Rev 5 page 18/30

 LD39020
DFN4 1x1 package info

Figure 31. DFN4 1x1 tape outline

Figure 32. DFN4 1x1 reel outline

Tape width (mm) A max. N min. W1 max. W2 max. W3 min. / max.

8 180 60 8.4 14.4 7.9 / 10.9

DS9956 - Rev 5 page 19/30

 LD39020
DFN4 1x1 package info

Figure 33. DFN4 1x1 orientation

DS9956 - Rev 5 page 20/30

 LD39020
SOT23-5L mechanical data

8.2 SOT23-5L mechanical data

Figure 34. SOT23-5L package outline

7049676_k

Table 8. SOT23-5L package mechanical data

mm
Dim.
Min. Typ. Max.

A 0.90 1.45
A1 0 0.15
A2 0.90 1.30
b 0.30 0.50
c 0.09 0.20
D 2.95
E 1.60
e 0.95
H 2.80
L 0.30 0.60
θ 0° 8°

DS9956 - Rev 5 page 21/30

 LD39020
SOT23-5L mechanical data

Figure 35. SOT23-5L recommended footprint

Note: Dimensions are in mm

DS9956 - Rev 5 page 22/30

 LD39020
SOT23-5L packing information

8.3 SOT23-5L packing information

Figure 36. SOT23-5L tape and reel outline

A D N

T
Po

Bo
Ko Ao P

Table 9. SOT23-5L tape and reel mechanical data

mm
Dim.
Min. Typ. Max.

A 180
C 12.8 13.0 13.2
D 20.2
N 60
T 14.4
Ao 3.13 3.23 3.33
Bo 3.07 3.17 3.27
Ko 1.27 1.37 1.47
Po 3.9 4.0 4.1
P 3.9 4.0 4.1

DS9956 - Rev 5 page 23/30

 LD39020
Order code

9 Order code

Table 10. DFN4 1x1 order code

Order code Output voltage (V) Auto-discharge Tolerance (%) Marking

LD39020ADTPU08R 0.5 A1
0.8 Yes
LD39020DTPU08R 2 08
LD39020ADTPU11R 0.5 A4
1.1 Yes
LD39020DTPU11R 2 11
LD39020ADTPU13R 0.5 AP
1.3 Yes
LD39020DTPU13R 2 13

LD39020ADTPU15R (1) 0.5 A6

1.5 Yes
LD39020DTPU15R 2 15
LD39020ADTPU18R 0.5 A7
1.8 Yes
LD39020DTPU18R 2 18
LD39020ATPU185R 0.5 BR
1.85 No
LD39020TPU185R 2 CR
LD39020ADTPU21R 0.5 A9
2.1 Yes
LD39020DTPU21R(1) 2 21

LD39020ADTPU25R 0.5 AA
2.5 Yes
LD39020DTPU25R 2 25

LD39020ADTPU27R(1) 0.5 AB
2.7 Yes
LD39020DTPU27R(1) 2 27

LD39020ADTPU28R 0.5 AC
2.8 Yes
LD39020DTPU28R(1) 2 28

LD39020ADTPU30R 0.5 AF
3 Yes
LD39020DTPU30R 2 30

LD39020ADTPU31R(1) 0.5 AG
3.1 Yes
LD39020DTPU31R 2 31
LD39020ATPU32R 0.5 BH
3.2 No
LD39020TPU32R 2 CH
LD39020ADTPU33R 0.5 AJ
Yes
LD39020DTPU33R 2 33
3.3
LD39020ATPU33R 0.5 BJ
No
LD39020TPU33R 2 CJ

LD39020ADTPU40R(1) 0.5 AL
4 Yes
LD39020DTPU40R 2 40

LD39020ADTPU47R(1) 0.5 AM
4.7 Yes
LD39020DTPU47R 2 47

1. Available on request.

DS9956 - Rev 5 page 24/30

 LD39020
Order code

Table 11. SOT23-5L order code

Order code Output voltage (V) Auto-discharge Tolerance (%) Marking

LD39020ADM30R 3.0 Yes 0.5 AD30

DS9956 - Rev 5 page 25/30

 LD39020

Revision history

Table 12. Document revision history

Date Revision Changes

04-Dec-2013 1 Initial release.

02-Apr-2014 2 Updated Table 10: "DFN4 1x1 order codes"..
Added SOT23-5L package. Modified features and description in cover page.
Updated Section 7: "Pin configuration" and Table 3: "Thermal data". Added
05-Jun-2015 3 Section 13.2: "SOT23-5L package information" and Section 13.3: "SOT23-5L
packing information".
Minor text changes.
Updated package name from DFN1x1-4L to DFN4 1x1.
03-Jul-2015 4 Updated note in Table 11: "SOT23-5L order code".
Minor text changes.
Added Figure 31. DFN4 1x1 tape outline, Figure 32. DFN4 1x1 reel outline and
07-Jan-2019 5 Figure 33. DFN4 1x1 orientation.
Updated Section 9 Order code.

DS9956 - Rev 5 page 26/30

 LD39020
Contents

Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 Typical application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
5 Electrical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1 Soft start function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.2 Output discharge function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.3 Input and output capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

7 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

8 Package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
8.1 DFN4 1x1 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.2 SOT23-5L package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.3 SOT23-5L packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
List of tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
List of figures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

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 LD39020
List of tables

List of tables
Table 1. Pin description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 4. ESD performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 5. Electrical characteristics for LD39020T, LD39020DT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 6. Electrical characteristics for LD39020AT, LD39020ADT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 7. DFN4 1x1 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 8. SOT23-5L package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 9. SOT23-5L tape and reel mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 10. DFN4 1x1 order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 11. SOT23-5L order code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 12. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

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 LD39020
List of figures

List of figures
Figure 2. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Figure 3. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 4. Typical application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 5. Output voltage vs. temperature (IOUT = 1 mA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6. Output voltage vs. temperature (IOUT = 200 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7. Line regulation vs. temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 8. Load regulation vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 9. Quiescent current vs. temperature (IOUT = 0 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 10. Quiescent current vs. temperature (IOUT = 200 mA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 11. Shutdown current vs. temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 12. Quiescent current vs. load current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 13. Quiescent current vs. input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 14. Dropout voltage vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 15. Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 16. Supply voltage rejection vs. input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 17. Output noise spectral density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 18. Stability area vs. (COUT, ESR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 19. Enable startup (VOUT = 1 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 20. Enable startup (VOUT = 5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 21. Turn-on time (VOUT = 1 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 22. Turn-off time (VOUT = 1 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 23. Turn-on time (VOUT = 5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 24. Turn-off time (VOUT = 5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 25. Line transient (VOUT = 1 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 26. Line transient (VOUT = 5 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 27. Load transient (VOUT = 1 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 28. Load transient (VOUT = 5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 29. DFN4 1x1 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 30. DFN4 1x1 recommended footprint. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 31. DFN4 1x1 tape outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 32. DFN4 1x1 reel outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 33. DFN4 1x1 orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 34. SOT23-5L package outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 35. SOT23-5L recommended footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 36. SOT23-5L tape and reel outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

DS9956 - Rev 5 page 29/30

 LD39020

IMPORTANT NOTICE – PLEASE READ CAREFULLY

STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST
products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST
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Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of
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Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
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DS9956 - Rev 5 page 30/30