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PDF LD1117B Data sheet ( Hoja de datos )
| Número de pieza | LD1117B | |
| Descripción | LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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LD1117A/B
® SERIES
LOW DROP FIXED AND ADJUSTABLE
POSITIVE VOLTAGE REGULATORS
s LOW DROPOUT VOLTAGE
(1.15V TYP @ IOUT=1.2A, 25 oC)
s VERY LOW QUIESCENT CURRENT
(5mA TYP @ 25 oC)
s TYPE A: OUTPUT CURRENT UP TO 1000mA
s TYPE B: OUTPUT CURRENT UP TO 1200mA
s FIXED OUTPUT VOLTAGE OF: 1.8V, 2.5V,
2.85V, 3.3V, 5.0V
s ADJUSTABLE VERSION AVAILABILITY
(Vref=1.25V)
s INTERNAL CURRENT AND THERMAL LIMIT
s ONLY 10 µF FOR STABILITY
s AVAILABLE IN ± 2% (AT 25oC) AND 4% IN
FULL TEMPERATURE RANGE
s HIGH SUPPLY VOLTAGE REJECTION :
(80dB TYP)
s TEMPERATURE RANGE : 0oC TO 125oC
DESCRIPTION
The LD1117A and LD1117B are two LOW
DROP Voltage Regulator able to provide
respectively up to 1000mA and 1200mA of
Output Current, available even in adjustable
version (Vref=1.25V). Concerning fixed versions,
are offered the following Output Voltages: 1.8V,
2.5V, 2.85V, 3.3V and 5.0V. The 2.85V type is
ideal for SCSI-2 lines active termination. The
device is supplied in: SOT-223, DPAK. The
BLOCK DIAGRAM
PRELIMINARY DATA
SOT-223
TO-252 (DPAK)
SOT-223 and DPAK surface mount packages
optimize the thermal characteristics even
offering a relevant space saving effect. High
efficency is assured by NPN pass transistor. In
fact in this case, unlike than PNP one, the
Quiescent Current flows mostly into the load.
Only a very common 10µF minimum capacitor
is needed for stability. The ADJUSTABLE
LD1117 is pin to pin compatible with the other
standard Adjustable voltage regulators
maintaining the better performances in terms of
Drop and Tolerance.
June 2000
1/16
1 page  
LD1117A/B SERIES
ELECTRICAL CHARACTERISTICS FOR LD1117A#25 (refer to the test circuits,
Tj = 0 to 125 oC, CO = 10 µF, CI = 10 µF unless otherwise specified)
Symbol
Parameter
Test Conditions
Min. Typ.
VO Output Voltage
VI = 4.5 V IO = 10 mA Tj = 25 oC
2.45 2.5
VO Output Voltage
IO = 0 to 1000 mA VI = 3.9 to 8 V
2.4
∆VO Line Regulation
VI = 3.9 to 8 V IO = 0 mA
1
∆VO Load Regulation
VI = 3.9 V IO = 0 to 1000 mA
1
VI Operating Input Voltage
IO = 100 mA
Id Quiescent Current
IO Output Current
VI ≤ 10 V IO = 0 mA
VI - VO = 5 V Tj = 25 oC
1000
5
1 20 0
SVR Supply Voltage Rejection
IO = 40 mA f = 120 Hz
VI - VO = 3 V Vripple = 1 Vpp
60 80
VD Dropout Voltage
∆VO(pwr) Thermal Regulation
IO = 100 mA
IO = 500 mA
IO = 1000 mA
Ta = 25 oC 30ms Pulse
1
1. 05
1. 15
0. 08
Max.
2.55
2.6
6
10
10
10
1.10
1.15
1.30
0.2
Unit
V
V
mV
mV
V
mA
mA
dB
V
V
V
%/W
ELECTRICAL CHARACTERISTICS FOR LD1117B#25 (refer to the test circuits,
Tj = 0 to 125 oC, CO = 10 µF, CI = 10 µF unless otherwise specified)
Symbol
Parameter
Test Conditions
Min. Typ.
VO Output Voltage
VI = 4.5 V IO = 10 mA Tj = 25 oC
2.45 2.5
VO Output Voltage
IO = 0 to 1200 mA VI = 3.9 to 8 V
2.4
∆VO Line Regulation
VI = 3.9 to 8 V IO = 0 mA
1
∆VO Load Regulation
VI = 3.9 V IO = 0 to 1200 mA
1
VI Operating Input Voltage
IO = 100 mA
Id Quiescent Current
IO Output Current
VI ≤ 10 V IO = 0 mA
VI - VO = 5 V Tj = 25 oC
1200
5
1 50 0
SVR Supply Voltage Rejection
IO = 40 mA f = 120 Hz
VI - VO = 3 V Vripple = 1 Vpp
60 80
VD Dropout Voltage
∆VO(pwr) Thermal Regulation
IO = 100 mA
IO = 500 mA
IO = 1200 mA
Ta = 25 oC 30ms Pulse
1
1. 05
1. 15
0. 08
Max.
2.55
2.6
6
10
10
10
1.10
1.15
1.30
0.2
Unit
V
V
mV
mV
V
mA
mA
dB
V
V
V
%/W
5/16
5 Page 
TYPICAL APPLICATIONS (continued):
FIGURE 4: Voltage Regulator With Reference
LD1117A/B SERIES
FIGURE 5: Battery Backed-up Regulated Supply
11/16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LD1117B.PDF ] | |
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