Document
BL317
HIGH CURRENT ADJUSTABLE VOLTAGE REGULATOR BL317
DESCRIPTION
The BL317 is an adjustable 3-terminal positive voltage regulator, designed to supply 1A of
output current with voltage adjustable from 1.3V ~ 35V.
F E AT U R E S
Typical 1% Output Voltage Tolerance Output voltage adjustable from 1.3V ~35V Output current in excess of 1A Internal short circuit protection Internal over temperature protection Output transistor safe area compensation
A P P L I C AT I O N S
PC Motherboard LCD Monitor Graphic Card DVD Player Network Interface Card/Switch Telecom Equipment Printer and other Peripheral Equipment
Pin No. 1 2 3
Symbol Adj. Vout Vin
Definition Adjustable
Output Input
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BLOCK DIAGRAM
BL317
ABSOLUTE MAXIMUM RATINGS (Ta=25°C) *
Characteristic
Symbol Min. Max. Unit
Input - Output Voltage Difference
Vin-Vout
37 V
Power Dissipation
Pd Internal limited
Maximum junction temperature
TJ 150 °C
Storage temperature Lead temperature (soldering, 10sec)
TS -40 150 °C
TLEAD
260 °C
ESD (human body model)
ESD
4000
V
*: Absolute maximum ratings are stress ratings only and functional device operation is not implied. The device could be damaged beyond Absolute maximum ratings.
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BL317
ELECTRICAL CHARACTERISTICS (VIN-VOUT=5V, IOUT=10mA, Ta=25°C,
unless otherwise specified. ) *
Characteristics Reference voltage Line regulation
Test conditions
10mA≤ IOUT ≤1A 3V≤ (VIN-VOUT) ≤37V PD≦ 20W
3V≦ VIN-VOUT≦ 37V
Load regulation
0mA≦ IOUT≦ 1A
Symbol Min. Typ. Max. Unit VREF 1.20 1.25 1.30 V SV 0.01 0.04 %/V Si 0.2 0.4 %
Adjust pin current
Iadj 50 100 µA
Adjust pin current change
Minimum current
load
Ripple rejection
Te m p e r a t u r e stability
RMS output noise (% of VOUT)
Thermal resistance, Junction to case
Thermal resistance,
Junction
to
Ambient
Thermal shutdown hysteresis
3V≦ VIN-VOUT≦ 37V, 10mA≦ IOUT≦ 1A, PD≦ 20W
VIN-VOUT=37V
f=120Hz,COUT=1µ F tantalum, ( V I N -V O U T ) = 3 V, I O U T = 1 A
TMIN≦ TJ≦ TMAX
Ta=25℃ , 10Hz≤ f ≤10kHz
S O T- 2 2 3 TO-252 TO-220 TO-263 S O T- 2 2 3 TO-252 TO-220 TO-263
Δ Iadj ILmin RR
en θJC θJA Thys
0.2 5.0 µA
3.5 10.0 mA
60 75
dB
0.7
0.003
23 12 5 5 165 112 54 64
25
%
%
℃ /W
℃ /W
℃
*: Maximum Power Dissipation is Package Type and Case Temperature dependent.
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APPLICATION CIRCUIT
BL317
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CHARACTERISTICS CURVES
BL317
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OUTLINE DRAWING
S O T- 2 2 3
BL317
Unit:mm
TO-220
Unit:mm
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TO-252
BL317
Unit:mm
TO-263
Unit:mm
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