UTC LD1117/A LINEAR INTEGRATED CIRCUIT
LOW DROP FIXED AND
ADJUSTABLE POSITIVE VOLTAGE 2 1
3
REGULATORS
DESCRIPTION SOT-223 SOP-8
The UTC LD1117/A is a LOW DROP Voltage Regulator
able to provide up to 0.8/1.0A of Output Current, available
even in adjustable version (Vref=1.25V). Concerning fixed
versions, are offered the following Output Voltages: 1.8V, 1
2.5V, 2.85V, 3.0V, 3.3V and 5.0V. The 2.85V type is ideal for 1
SCSI-2 lines active termination. The device is supplied in: TO-220 TO-252
SOT-223, TO-252, TO-263, TO-263-3, SOP-8 and TO-220.
The SOT-223, TO-263, TO-263-3 and TO-252 surface mount
packages optimize the thermal characteristics even offering a
relevant space saving effect. High efficiency is assured by
1 1
NPN pass transistor. In fact in the case, unlike than PNP one,
the Quiescent Current flows mostly into the load. Only a very TO-263 TO-263-3
common 10µF minimum capacitor is needed for stability. On
chip trimming allows the regulator to reach a very tight output
voltage tolerance, within ±1% at 25°C. The ADJUSTABLE SOP-8 1: GND; 2,3,6,7: Vout;
LD1117/A is pin to pin compatible with the other standard 4: Vin; 5,8: NC
Adjustable voltage regulators maintaining the better
performances in terms of Drop and Tolerance.
FEATURES
*Low dropout voltage (1V Typ.)
*2.85V device performances are suitable for SCSI-2 active
termination
*Output current up to 0.8/1.0A
*Fixed output voltage of: 1.8V,2.5V, 2,85V, 3.0V, 3.3V, 5.0V
*Adjustable version availability (Vref=1.25V)
*Internal current and thermal limit
*Available in ±1%(at 25°C) and 2% in all temperature range
*Supply voltage rejection: 75dB (TYP)
*Temperature range: 0°C to 125°C
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UTC LD1117/A LINEAR INTEGRATED CIRCUIT
MARKING INFORMATION
PACKAGE VOLTAGE PIN CODE PIN 1 PIN 2 PIN 3 MARKING
CODE
18:1.8V A GND OUT IN
25:2.5V
B OUT GND IN CURRENT LD1117
PIN CODE
SOT-223 28:2.85V CODE
VOLTAGE
30:3.0V C GND IN OUT CODE
DATE
CODE
33:3.3V
D IN GND OUT 1 2 3
50:5.0V
AD:ADJ A GND OUT IN
TO-220 UTC CURRENT
B OUT GND IN LD1117 CODE
TO-252 PIN CODE
VOLTAGE DATE
TO-263 C GND IN OUT CODE CODE
TO-263-3
D IN GND OUT 1 2 3
Note: The current code “A” means output current up to 1.0A, while without “A” means output current up to 0.8A.
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BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL VALUE UNIT
DC Input Voltage VIN 15 V
Power Dissipation Ptot 12 W
Storage temperature Tstg -65 ~ +150 °C
Operating Junction Top 0 ~ +125 °C
Temperature
Note: Absolute Maximum Ratings are those value beyond which damage to the device may occur. Functional
operation under there condition is not implied. Over the above suggested Max Power Dissipation a Short Circuit
could definitively damage the device.
THERMAL DATA
PARAMETER SYMBOL VALUE UNIT
Thermal Resistance Junction-case Rth-case
SOT-223 15 °C/W
SOP-8 20 °C/W
TO-252 8 °C/W
TO-220 3 °C/W
TO-263 3 °C/W
Thermal Resistance Junction-ambient Rthj-amb
TO-220 50 °C/W
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UTC LD1117/A LINEAR INTEGRATED CIRCUIT
APPLICATION CIRCUIT
LD1117/A
UTC LD1117/A-1.8 ELECTRICAL CHARACTERISTICS
(refer to the test circuits, Tj=0 to 125°C, Co=10µF unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Output Voltage Vo Vin=3.8V, Io=10mA, Tj=25°C 1.780 1.800 1.820 V
Output Voltage Vo Io=0 to 800/1000mA, Vin=3.3 to 8V 1.760 1.840 V
Line Regulation ∆Vo Vin=3.3 to 8V, Io=0mA 1 6 mV
Load Regulation ∆Vo Vin=3.3V, Io=0 to 800/1000mA 1 10 mV
Temperature stability ∆Vo 0.5 %
Long Term Stability ∆Vo 1000 hrs, Tj=125°C 0.3 %
Operating Input Voltage Vin Io=100mA 10 V
Quiescent Current Id Vin≤8V 5 10 mA
Output Current Io Vin=6.8V, Tj=25°C 800 950 1200 mA
Output Noise Voltage eN B=10Hz to 10KHz, Tj=25°C 100 µV
Supply Voltage SVR Io=40mA, f=120Hz, Tj=25°C, Vin=5.5V, 60 75 dB
Rejection Vripple=1Vpp
Dropout Voltage Vd Io=100mA 1.00 1.10 V
Io=500mA 1.05 1.15 V
Io=800mA 1.10 1.20 V
Io=1000mA 1.15 1.25 V
Thermal Regulation Ta=25°C, 30ms Pulse 0.01 0.10 %/W
UTC LD1117/A-2.5 ELECTRICAL CHARACTERISTICS
(refer to the test circuits, Tj=0 to 125°C, Co=10µF unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Output Voltage Vo Vin=4.5V, Io=10mA, Tj=25°C ±1% 2.475 2.500 2.525 V
±2% 2.450 2.500 2.550 V
Output Voltage Vo Io=0 to 800/1000mA, ±2% 2.450 2.550 V
Vin=3.9 to 10V ±4% 2.400 2.600 V
Line Regulation ∆Vo Vin=3.9 to 10V, Io=0mA 1 6 mV
Load Regulation ∆Vo Vin=3.9V, Io=0 to 800/1000mA 1 10 mV
Temperature stability ∆Vo 0.5 %
Long Term Stability ∆Vo 1000 hrs, Tj=125°C 0.3 %
Operating Input Voltage Vin Io=100mA 15 V
Quiescent Current Id Vin≤10V 5 10 mA
Output Current Io Vin=7.5V, Tj=25°C 800 950 1200 mA
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PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Output Noise Voltage eN B=10Hz to 10KHz, Tj=25°C 100 µV
Supply Voltage SVR Io=40mA, f=120Hz, Tj=25°C, Vin=5.5V, 60 75 dB
Rejection Vripple=1Vpp
Dropout Voltage Vd Io=100mA 1.00 1.10 V
Io=500mA 1.05 1.15 V
Io=800mA 1.10 1.20 V
Io=1000mA 1.15 1.25 V
Thermal Regulation Ta=25°C, 30ms Pulse 0.01 0.10 %/W
UTC LD1117/A-2.85 ELECTRICAL CHARACTERISTICS
(refer to the test circuits, Tj=0 to 125°C, Co=10µF unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Output Voltage Vo Vin=4.85V, Io=10mA, Tj=25°C 2.82 2.85 2.88 V
Output Voltage Vo Io=0 to 800/1000mA,Vin=4.25 to 10V 2.79 2.91 V
Line Regulation ∆Vo Vin=4.25 to 10V, Io=0mA 1 6 mV
Load Regulation ∆Vo Vin=4.25V, Io=0 to 800/1000mA 1 10 mV
Temperature stability ∆Vo 0.5 %
Long Term Stability ∆Vo 1000 hrs, Tj=125°C 0.3 %
Operating Input Voltage Vin Io=100mA 15 V
Quiescent Current Id Vin≤10V 5 10 mA
Output Current Io Vin=7.85V, Tj=25°C 800 950 1200 mA
Output Noise Voltage eN B=10Hz to 10KHz, Tj=25°C 100 µV
Supply Voltage SVR Io=40mA, f=120Hz, Tj=25°C, Vin=5.85V, 60 75 DB
Rejection Vripple=1Vpp
Dropout Voltage Vd Io=100mA 1.00 1.10 V
Io=500mA 1.05 1.15 V
Io=800mA 1.10 1.20 V
Io=1000mA 1.15 1.25 V
Thermal Regulation Ta=25°C, 30ms Pulse 0.01 0.10 %/W
UTC LD1117/A-3.0 ELECTRICAL CHARACTERISTICS
(refer to the test circuits, Tj=0 to 125°C, Co=10µF unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Output Voltage Vo Vin=5V, Io=10mA, Tj=25°C ±1% 2.97 3.00 3.03 V
±2% 2.94 3.00 3.06 V
Output Voltage Vo Io=0 to 800/1000mA, ±2% 2.94 3.06 V
Vin=4.5 to 10V ±4% 2.88 3.12 V
Line Regulation ∆Vo Vin=4.5 to 12V, Io=0mA 1 6 mV
Load Regulation ∆Vo Vin=4.5V, Io=0 to 800/1000mA 1 10 mV
Temperature stability ∆Vo 0.5 %
Long Term Stability ∆Vo 1000 hrs, Tj=125°C 0.3 %
Operating Input Voltage Vin Io=100mA 15 V
Quiescent Current Id Vin≤12V 5 10 mA
Output Current Io Vin=8V, Tj=25°C 800 950 1200 mA
Output Noise Voltage eN B=10Hz to 10KHz, Tj=25°C 100 µV
Supply Voltage SVR Io=40mA, f=120Hz, Tj=25°C, Vin=6V, 60 75 dB
Rejection Vripple=1Vpp
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UTC LD1117/A LINEAR INTEGRATED CIRCUIT
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Dropout Voltage Vd Io=100mA 1.00 1.10 V
Io=500mA 1.05 1.15 V
Io=800mA 1.10 1.20 V
Io=1000mA 1.15 1.25 V
Thermal Regulation Ta=25°C, 30ms Pulse 0.01 0.10 %/W
UTC LD1117/A-3.3 ELECTRICAL CHARACTERISTICS
(refer to the test circuits, Tj=0 to 125°C, Co=10µF unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Output Voltage Vo Vin=5.3V, Io=10mA, Tj=25°C ±1% 3.267 3.300 3.333 V
±2% 3.235 3.300 3.365 V
Output Voltage Vo Io=0 to 800/1000mA, ±2% 3.235 3.365 V
Vin=4.75 to 10V ±4% 3.160 3.440 V
Line Regulation ∆Vo Vin=4.75 to 15V, Io=0mA 1 6 mV
Load Regulation ∆Vo Vin=4.75V, Io=0 to 800/1000mA 1 10 mV
Temperature stability ∆Vo 0.5 %
Long Term Stability ∆Vo 1000 hrs, Tj=125°C 0.3 %
Operating Input Voltage Vin Io=100mA 15 V
Quiescent Current Id Vin≤15V 5 10 mA
Output Current Io Vin=8.3V, Tj=25°C 800 950 1200 mA
Output Noise Voltage eN B=10Hz to 10KHz, Tj=25°C 100 µV
Supply Voltage SVR Io=40mA, f=120Hz, Tj=25°C, Vin=6.3V, 60 75 DB
Rejection Vripple=1Vpp
Dropout Voltage Vd Io=100mA 1.00 1.10 V
Io=500mA 1.05 1.15 V
Io=800mA 1.10 1.20 V
Io=1000mA 1.15 1.25 V
Thermal Regulation Ta=25°C, 30ms Pulse 0.01 0.10 %/W
UTC LD1117/A-5.0 ELECTRICAL CHARACTERISTICS
(refer to the test circuits, Tj=0 to 125°C, Co=10µF unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Output Voltage Vo Vin=7V, Io=10mA, Tj=25°C ±1% 4.95 5.00 5.05 V
±2% 4.90 5.00 5.10 V
Output Voltage Vo Io=0 to 800/1000mA, ±2% 4.90 5.10 V
Vin=6.5 to 15V ±4% 4.80 5.20 V
Line Regulation ∆Vo Vin=6.5 to 15V, Io=0mA 1 10 mV
Load Regulation ∆Vo Vin=6.5V, Io=0 to 800/1000mA 1 15 mV
Temperature stability ∆Vo 0.5 %
Long Term Stability ∆Vo 1000 hrs, Tj=125°C 0.3 %
Operating Input Voltage Vin Io=100mA 15 V
Quiescent Current Id Vin≤15V 5 10 mA
Output Current Io Vin=10V, Tj=25°C 800 950 1200 mA
Output Noise Voltage eN B=10Hz to 10KHz, Tj=25°C 100 µV
Supply Voltage SVR Io=40mA, f=120Hz, Tj=25°C, Vin=8V, 60 75 dB
Rejection Vripple=1Vpp
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UTC LD1117/A LINEAR INTEGRATED CIRCUIT
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Dropout Voltage Vd Io=100mA 1.00 1.10 V
Io=500mA 1.05 1.15 V
Io=800mA 1.10 1.20 V
Io=1000mA 1.15 1.25 V
Thermal Regulation Ta=25°C, 30ms Pulse 0.01 0.10 %/W
UTC LD1117/A-ADJUSTABLE ELECTRICAL CHARACTERISTICS
(refer to the test circuits, Tj=0 to 125°C, Co=10µF unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Reference Voltage Vref Vin-VO=2V, Io=10mA, Tj=25°C 1.238 1.25 1.262 V
Reference Voltage Vref Io=10 to 800/1000mA, Vin-Vo=1.4 to 1.225 1.275 V
10V
Line Regulation ∆Vo Vin-Vo=1.5 to 13.75V, Io=10mA 0.035 0.200 %
Load Regulation ∆Vo Vin-Vo=3V, Io=10 to 800/1000mA 0.10 0.400 %
Temperature stability ∆Vo 0.50 %
Long Term Stability ∆Vo 1000 hrs, Tj=125°C 0.3 %
Operating Input Voltage Vin 15 V
Adjustment Pin Current Iadj Vin≤15V 60 120 µA
Adjustment Pin Current ∆Iadj Vin-Vo=1.4 to 10V, 1 5 µA
Change Io=10 to 800/1000mA
Minimum Load Current Io(min) Vin=15V 2 5 mA
Output Current Io Vin-Vo=5V, Tj=25°C 800 950 1200 mA
Output Noise (%Vo) eN B=10Hz to 10KHz, Tj=25°C 0.003 %
Supply Voltage SVR Io=40mA, f=120Hz, Tj=25°C, 60 75 dB
Rejection Vin-Vo=3V, Vripple=1Vpp
Dropout Voltage Vd Io=100mA 1.00 1.10 V
Io=500mA 1.05 1.15 V
Io=800mA 1.10 1.20 V
Io=1000mA 1.15 1.25 V
Thermal Regulation Ta=25°C, 30ms Pulse 0.01 0.10 %/W
TYPICAL APPLICATIONS
FIG.1 Negative Supply
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UTC LD1117/A LINEAR INTEGRATED CIRCUIT
FIG.2 Active Terminator for SCSI-2 BUS
FIG.3 Circuit for Increasing Output Voltage
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FIG.4 Voltage Regulator With Reference
FIG.5 Battery Backed-up Regulated Supply
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FEEDBACK PATH
FIG.6 Post-Regulated Dual Supply
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LD1117/A ADJUSTABLE APPLICATION NOTE
The LD1117/A ADJUSTABLE has a thermal stabilized 1.25±0.012V reference voltage between the OUT and ADJ
pins. IADJ is 60µA typ. (120µA max.) and ∆IADJ is 1µA typ. (5µA max.).
R1 is normally fixed to 120Ω. From figure 7 we obtain:
VOUT=VREF+R2(IADJ + IR1)=VREF + R2(IADJ + VREF / R1)=VREF(1+R2/R1) + R2 x IADJ.
In normal application R2 value is in the range of few Kohm,, so the R2 X IADJ product could not be considered in the
VOUT calculation; then the above expression becomes: VOUT=VREF(1+R2/R1)
In order to have the better load regulation it is important to realize a good Kelvin connection of R1 and R2 resistors.
In particular R1 connection must be realized very close to OUT and ADJ pin, while R2 ground connection must be
placed as near as possible to the negative Load pin. Ripple rejection can be improved by introducing a 10µF
electrolytic capacitor placed in parallel to the R2 resistor (See Fig. 8)
FIG.7 Adjustable Output Voltage Application Circuit
FIG.8 Adjustable Output Voltage Application with improved Ripple Rejection.
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UTC LD1117/A LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
Fig.1 Reference Voltge vs. Fig.2 Output Voltage vs.
Temperature Temperautre
1.250 3.70
1.245 3.65
VOUT SET WITH 1% RESISTORS
1.240 3.60
Vout=3.6V
reference voltage (V)
Output Voltage(V)
1.235 3.55
1.230 3.50
1.225 3.45
1.220 3.40
1.215 3.35
Vout=3.3V
1.210 3.30
1.205 3.25
Note: LD1117 Only
1.200 3.20
-75 -50 -25 0 25 50 75 100 125 150 175 -75 -50 -25 0 25 50 75 100 125 150 175
Junction Temperature(°C) Junction Temperature(°C)
Fig.3 Maximum Power Dissipation
10
TO-263 & TO-252
6
Power (W)
4
SOT-223
0
25 45 65 85 105 125
Case Temperature(°C)
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