AX6607

600mA LDO Linear Regulator with Shutdown

™ GENERAL DESCRIPTION

The AX6607 is a low dropout, positive linear regulator with very low quiescent. It can
supply 600mA output current with low dropout about 600mV.The BP pin with a 10nF
bypass capacitor can help reduce the output noise level. The characteristics of low
dropout voltage and less quiescent current make it good for some critical current
application, for example, some battery powered devices. The typical quiescent current is
approximately 45µA. In the shutdown mode, the maximum supply current is less than
1uA. The AX6607 regulator is able to operate with output capacitors as small as 1uF for
stability. The AX6607 series are offering several fixed output voltage types including 1.5V,
1.8V, 2.5V, 2.6V, 2.7V, 2.8V, 3.0V, 3.3V and adjustable version. Built-in current-limit and
thermal-shutdown functions prevent any fault condition from IC damage.

™ FEATURES

- Input voltage range : 2.8V~5.5V

- Adjustable and 1.5/1.8/2.5/2.6/2.7/2.8/3.0/3.3V fixed output voltages
- VOUT adjust range from VFB to 5.0V
- Max. ±2% Fixed Output Accuracy
- Dropout voltage is 600mV at 600mA output current
- Guaranteed 600mA output current
- Very Low quiescent current at 45µA (typ.)
- Needs Only 1uF capacitor for Stability
- Maximum supply current in shutdown mode <1uA
- Current limit and thermal shutdown protection
- Available in the SOT23-5L and DFN-6L Pb-Free Packages

1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 May.04, 2009
 AX6607

™ Block Diagram

VIN
VIN VOUT
VOUT

Error Error
Current Current
Amp Limit Amp
Limit - +
- +
NC
EN Enable FB
EN Enable
Bandgap Bandgap

Thermal Thermal
Shutdown GND Shutdown GND

BP

Fixed Version Adjustable Version

™ PIN ASSIGNMENT

The packages of AX6607 are SOT23-5L and DFN-6L; the pin assignment is given by:
(Top View) Name Description
VIN 1 5 VOUT Voltage input. The input capacitor
VIN in the range of 1uF to 10uF is
GND 2 sufficient.
EN 3 4 BP GND Ground
EN Enable pin (Active High)
SOT23-5L Reference Noise Bypass (The
BP
Bypass capacitor ≧1nF
VIN EN GND
Output Voltage, The AX6607 is
6 5 4 VOUT stable with an output capacitor 1uF
for greater.
AX6607
For adjustable output voltage
1 2 3 version only, the pin connects two
FB/NC resistances to decide output
VOUT BP FB/NC
voltage. When use fixed output
DFN-6L (2*2)
(TOP VIEW)
voltage version, this pin is NC pin.

2/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 May.04, 2009
 AX6607

™ ORDER/MARKING INFORMATION
Order Information
AX6607 - XX X X

Output voltage Package Packing

15 : 1.5V B : SOT23-5L Blank:Tube

18 : 1.8V Z2 : DFN-6L(2*2) A : Taping
25 : 2.5V
26 : 2.6V
27 : 2.7V
28 : 2.8V
30 : 3.0V
33 : 3.3V
Blank : ADJ(DFN only)

Top Marking (SOT23-5L) Top Marking (DFN-6L)

Output type
F&XXX XX Refer Identification Code

YWX ID Code: Internal

Date Code Week: 01~26(A~Z)

27~52(a~z)
Year : 9 = 2009
Identification Code A = 2010

Appendix
Part Number Identification Code Part Number Identification Code
AX6607-ADJ FA AX6607-2.7V Fp
AX6607-1.5V Fi AX6607-2.8V Fn
AX6607-1.8V Fk AX6607-3.0V Fr
AX6607-2.5V Fm AX6607-3.3V Fs
AX6607-2.6V Fj

™ Absolute Maximum Ratings (at TA=25℃)

Characteristics Symbol Rating Unit
VIN Pin Voltage VIN GND - 0.3 to GND + 6 V
Output Voltage VOUT GND - 0.3 to VIN + 0.3 V
Enable Voltage VEN GND - 0.3 to GND + 6 V
Feedback Voltage VFB GND - 0.3 to GND + 6 V
Power Dissipation PD SOT=400, DFN=830 mW
Storage Temperature Range TST -40 to +150 ℃
Operating Temperature Range TOP -40 to +85 ℃
Junction Temperature TJ -40 to +125 ℃
Thermal Resistance from Junction to case θJC SOT25=180,DFN6=25 ℃/W
Thermal Resistance from Junction to ambient θJA SOT25=250,DFN6=120 ℃/W
Note1 : θJA is measured with the PCB copper area of approximately 1 in2(Multi-layer). That need connect to VIN pin.

3/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 May.04, 2009
 AX6607

™ Electrical Characteristics
(VIN=VOUT+1V or VIN=2.8V whichever is greater, CIN=COUT=1uF, TA=25℃, unless otherwise noted)
Characteristics Symbol Conditions Min Typ Max Units
Input Voltage VIN (Note1) 2.8 - 5.5 V
Quiescent Current IQ IOUT =0mA - 45 70 µA
Output Voltage Accuracy ∆VOUT IOUT=1mA (Fixed Version) -2 - +2 %
Feedback Voltage VFB VIN=2.8V to 5.5V, IOUT=1mA 0.784 0.8 0.816 V
FB Input Leakage Current IFB VFB=0.8V -100 - 100 nA
Adjustable Output Voltage
Range
VOUT Adjustable Version only VFB - 5.0 V
1.5V≦VOUT≦2.0V - - 1400
Dropout Voltage
VDROP IOUT=600mA 2.0V＜VOUT≦2.8V - - 800 mV
(Note2) 2.8V＜VOUT≦5.0V - - 600
Current Limit ILIMIT RLOAD=1Ω 600 - - mA
I =1mA,
Line Regulation ∆VLINE OUT - 1 5 mV
VIN=VOUT+1V to 5V
Load Regulation (Note 3) ∆VLOAD IOUT =0m~600mA - 13 50 mV
V =V +1V, CO=1uF
Ripple Rejection PSRR IN OUT - -60 - dB
F=120Hz
CBP=10nF,F=1KHz, uV/ Hz
Output Noise - 0.4 -
VIN=5V
VENH 2.0 - -
Enable Input Threshold V
VENL - - 0.6
Enable Pin Current IEH VEN=VIN - - 0.1 µA
Shutdown Current ISD VIN=2.8~5V, VEN=0V - - 1 µA
Temperature Coefficient TC IOUT=1mA, VIN=5V - 50 - ppm/℃
Temperature Shutdown TS - 160 - ºC
Temperature Shutdown
Hysterisis
TSH - 25 - ºC
Note 1. Minimum VIN voltage is defined by output adds a dropout voltage.
Note 2. The dropout voltage is defined as VIN-VOUT, which is measured when VOUT drop about 100mV.
Note 3. Regulation is measured at constant junction temperature by using pulsed testing with a low ON time.

4/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 May.04, 2009
 AX6607

™ Application Circuit

(1) Fixed Output Voltage Version

ON
EN
AX6607 OFF
VIN EN VOUT
VIN
VOUT
GND BP COUT
CIN
1uF CBP 1uF
10nF

(2) Adjustable Output Voltage Version (For DFN-6L Only)

ON
EN
AX6607-ADJ OFF
VIN EN VOUT
VIN VOUT
R1
CIN COUT
1uF GND BP FB/NC 1uF
R2
CBP
10nF

™ Function Descriptions

A minimum of 1uF capacitor must be connected from VOUT to ground to insure

stability. Typically a large storage capacitor is connected from VIN to ground to ensure that
the input voltage does not sag below the minimum dropout voltage during the load
transient response. This pin must always be dropout voltage higher than VOUT in order for
the device to regulate properly.

™ Application Information

Like any low-dropout regulator, the AX6607 requires input and output decoupling
capacitors. The device is specifically designed for portable applications requiring
minimum board space and smallest components. These capacitors must be correctly
selected for good performance (see Capacitor Characteristics Section). Please note that
linear regulators with a low dropout voltage have high internal loop gains which require
care in guarding against oscillation caused by insufficient decoupling capacitance.
5/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 May.04, 2009
 AX6607

Capacitor Selection

Normally, use a 1µF capacitor on the input and a 1µF capacitor on the output of the
AX6607. Larger input capacitor values and lower ESR provide better supply-noise
rejection and transient response. A large value output capacitor may be necessary if large,
fast transients are anticipated and the device is located several inches from the power
source. The capacitors is recommended to use 1uF X5R or X7R dielectric ceramic
capacitors with 30mΩ to 50mΩ ESR range between device outputs to ground for
transient stability.

Input-Output (Dropout) Voltage

A regulator's minimum input-to-output voltage differential (dropout voltage)
determines the lowest usable supply voltage. In battery-powered systems, this determines
the useful end-of-life battery voltage. Because the device uses a PMOS, its dropout
voltage is a function of drain-to source on-resistance, RDS (ON), multiplied by the load
current:
VDROPOUT = VIN -VOUT = RDS (ON) x IOUT

Current Limit and Thermal Shutdown Protection

In order to prevent overloading or thermal condition from damaging the device,

AX6607 regulator has internal thermal and current limiting functions designed to protect
the device. It will rapidly shut off PMOS pass element during overloading or over
temperature condition.

Thermal Considerations
The AX6607 series can deliver a current of up to 300mA over the full operating
junction temperature range. However, the maximum output current must be dated at
higher ambient temperature to ensure the junction temperature does not exceed 125°C.
With all possible conditions, the junction temperature must be within the range specified
under operating conditions. Power dissipation can be calculated based on the output
current and the voltage drop across regulator.
PD = (VIN - VOUT) IOUT
The final operating junction temperature for any set of conditions can be estimated by the
following thermal equation:
PD (MAX) = (TJ (MAX) - TA) / θJA
Where TJ (MAX) is the maximum junction temperature of the die (125° C) and TA is the
maximum ambient temperature. The junction to ambient thermal resistance (θJA) for
SOT-23-5 package at recommended minimum footprint is 250°C/W. Visit our website in
which “Recommended Footprints for Soldering Surface Mount Packages” for detail.

6/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 May.04, 2009
 AX6607

PCB Layout

An input capacitance of ≅ 1µF is required between the AX6607 input pin and
ground (the amount of the capacitance may be increased without limit), this capacitor
must be located a distance of not more than 1cm from the input and return to a clean
analog ground. Input capacitor can filter out the input voltage spike caused by the surge
current due to the inductive effect of the package pin and the printed circuit board’s
routing wire. Otherwise, the actual voltage at the VIN pin may exceed the absolute
maximum rating. The output capacitor also must be located a distance of not more than
1cm from output to a clean analog ground. Because it can filter out the output spike
caused by the surge current due to the inductive effect of the package pin and the printed
circuit board’s routing wire.

7/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 May.04, 2009
 AX6607

™ Package Outlines

(1) SOT23-5L

C
E1
E
GAUGE PLANE

L θ

L1
e
DETAL A
e1

θ1(4x)
A2

DETAL A
A1

θ 2(4x)
b(5x)

Dimensions in Millimeters Dimensions in Inches

Symbol
Min. Nom. Max. Min. Nom. Max.
A 1.05 - 1.35 0.041 - 0.053
A1 0.05 - 0.15 0.002 - 0.006
A2 1.00 1.10 1.20 0.039 0.043 0.047
b 0.30 - 0.50 0.012 - 0.020
C 0.08 - 0.22 0.003 - 0.009
D 2.80 2.90 3.00 0.110 0.114 0.118
E1 1.50 1.60 1.70 0.059 0.063 0.067
E 2.60 2.80 3.00 0.102 0.110 0.118
L 0.30 - 0.60 0.012 - 0.024
L1 0.50 0.60 0.70 0.020 0.024 0.028
e1 1.80 1.90 2.00 0.071 0.075 0.079
e 0.85 0.95 1.05 0.033 0.037 0.041
θ 0o 4o 8o 0o 4o 8o
θ1 5o 10o 15o 5o 10o 15o
θ2 5o 10o 15o 5o 10o 15o

8/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 May.04, 2009
 AX6607

(2) DFN-6L (VSON-6L)

(Top View) (Bottom View)

A

b #6

E1
D

L
B e #1
#1 E
D1
A

A3

SEATING PLANE
A1

y
C

Dimensions In Millimeters Dimensions In Inches

Symbol
Min. Nom. Max. Min. Nom. Max.
A 0.55 0.60 0.65 0.022 0.024 0.026
A1 0.00 0.005 0.01 0.000 0.0002 0.0004
A3 0.06 REF. 0.003 REF
b 0.20 0.30 0.40 0.008 0.012 0.016
D 1.90 2.00 2.10 0.075 0.079 0.083
D1 1.8 BSC 0.071 BSC
E 1.90 2.00 2.10 0.075 0.079 0.083
E1 1.0 BSC 0.039 BSC
L 0.25 REF. 0.01 REF.
e 0.5 BSC. 0.02 BSC.
y 0.00 - 0.1 0.000 - 0.004

9/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 May.04, 2009