RT9179A Datasheet, PDF (1/11 Pages) Richtek Technology Corporation – Adjustable, 500mA LDO Regulator with Enable

RT9179A
Adjustable, 500mA LDO Regulator with Enable
General Description
The RT9179A is a high performance linear voltage
regulator with enable high function and adjustable output
with a 1.175V reference voltage. It operates from an input
of 3V to 5.5V and provides output current up to 500mA
with two external resistors to set the output voltage ranges
from 1.175V to 4.5V.
The RT9179A has superior regulation over variations in line
and load. Also it provides fast response to step changes in
load. Other features include over-current and over-
temperature protection. The device has enable pin to reduce
power consumption in shutdown mode.
The device is available in SOP-8 package.
Ordering Information
RT9179A
Package Type
S : SOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
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.
Features
400mV Dropout @ 500mA
150μA Low Quiescent Current
Excellent Line and Load Regulation
<1μA Standby Current in Shutdown Mode
Guaranteed 500mA Output Current
Adjustable Output Voltage Ranges from 1.175V to
4.5V
Over-Temperature/Over-Current Protection
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Battery-Powered Equipments
Graphic Card
Peripheral Cards
PCMCIA Card
Pin Configurations
(TOP VIEW)
EN
VIN
2
VOUT
3
ADJ
4
8
GND
7
GND
6
GND
5
GND
SOP-8
Typical Application Circuit
V_IN
Chip Enable
C₃
0.1uF
RT9179A
VIN
VOUT
EN
C₁
1uF
GND ^ADJ
V_OUT
R₁
C₂
3.3uF
R₂
V_OUT
=
1.175
x
(
1+
R1
R2
) Volts
Note: R2 around 200kΩ is recommended.
Refer to the “Application Information” for COUT selection.
DS9179A-07 March 2007
www.richtek.com
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