PRELIMINARY
S1117
Features
1.0A Adjustable LDO Linear Regulator
Symbol
adjustable version.
Space saving SMD types of SOT-223 and D-Pak(TO-252)
1.1V Drop-out Voltage
1.0A Output Current
Current Limiting and Thermal protection
Over Current Protection.
Ouput trimmed to 2% Tolerance
Fast Transient Response
General Description
The S1117 is a series of low dropout voltage regulators which can pro-
vide up to 1A of output current. On chip precision trimming adjusts the
refernce/output voltage to within
路
2%. Current limit is also trimmed to
ensure specified output current and controlled short-circuit current.
The S1117 series is available in SOT-223 and DPAK power packages.
A minimum of 10uF tantalum capacitor is required at the output to
improve the transient response and stability.
DPAK
SOT-223
Applications
Post Regulator for Sitching DC/DC Converter
High Efficiency Linear Regulator
Battery Chargers
PC Add on Card
Motherboard clock supplies
Absolute Maximum Ratings
Parameter
Input Voltage
Junction Temperature
Storage Temperature
Symbol
V
IN(MAX)
T
J
T
STG
Value
18
-25擄C ~ +125擄C
-55擄C ~ +150擄C
Units
V
擄C
擄C
Electrical Characteristics
( Vin = 3.25V, Co = 10uF, Ta = 25擄C, unless otherwise specified)
Parameter
Reference Voltage
Line Regulation
Load Regulation
Dropout Voltage 1
Dropout Voltage 2
Quiescent Current
Ripple Rejection
Symbol
Vref
dV
OUT1
dV
OUT2
V
DROP1
V
DROP2
Iq
RR
Test Condition
V
IN
= 3.25V, I
O
= 10mA
I
OUT
=10mA, 3.25V < V
IN
< 12.25V
V
IN
= 3.25V, 10mA < I
OUT
< 1A
I
OUT
= 100mA
I
OUT
= 1A
V
IN
< 12V
f
= 120Hz, C
OUT
= 22uF Tantalum,
4.15V < V
IN
< 4.35, I
OUT
= 500mA
MIn.
1.225
0
0
-
-
-
55
Typ.
1.250
1.0
1.0
1.00
1.10
5
100
Max.
1.275
2.5
6.0
1.15
1.25
10
200
Units
V
mV
mV
V
V
mA
dB
Sep 2002. Rev. 0
1/4
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