RT9172
3A Fixed Output Voltage LDO Regulator
General Description
The RT9172 series of low-dropout linear regulators operate
from a +2.25V to +6.0V input supply. A wide range of preset
output voltage options is available. These low dropout linear
regulators respond very fast to step changes in load, which
are suitable for low voltage microprocessor applications.
The RT9172 uses an internal PMOS as the pass device,
which does not cause extra GND current in heavy load
and dropout condition. The shutdown mode of low operation
current makes the IC suitable for power-saving systems.
The other features include current limiting and over
temperature protection.
Features
Low Dropout Voltage
Low Ground Pin Current
Load Regulation of 0.4% at 3A
0.5mA Quiescent Current in Shutdown Mode
Guaranteed Output Current of 3A DC
Available in TO-263 and TO-220 Packages
Output Voltage Accuracy
±
1.5%
Error Flag Indicates Output Status
Sense Option Improves Better Load Regulation
Extremely Low Output Capacitor Requirements
Over-Temperature/Over- Current Protection
RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9172
-
Applications
Microprocessor Power Supplies
GTL, GTL+, BTL, and SSTL Bus Terminators
Power Supplies for DSPs
SCSI Terminator
Post Regulators
High Efficiency Linear Regulators
Battery Chargers
Other Battery Powered Applications
Package Type
T5 : TO-220-5
M5 : TO-263-5
T : TO-220
M : TO-263
G : SOT-223
S : SOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Output Voltage
15 : 1.5V
16 : 1.6V
:
32 : 3.2V
33 : 3.3V
S : Pin Out Exchange
N : Pin 5 bond SENSE
F : Pin 5 bond FLG
Pin Configurations
(TOP VIEW)
VIN GND VOUT
(TAB)
2
3
1
2
3
Note :
Richtek Pb-free and Green products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
100%matte tin (Sn) plating.
1
2
TO-220
1
VIN GND VOUT
(TAB)
TO-263
3
VOUT
SENSE
GND
NC
2
3
4
8
7
6
5
VIN
GND
GND
EN
VIN GND VOUT
(TAB)
SOP-8
SOT-223
DS9172-15 April 2008
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
