RT9187

1

DS9187-08 August 2007

www.richtek.com

Pin Configurations

Applications

CDMA/GSM Cellular Handsets

Battery-Powered Equipment

Laptop, Palmtops, Notebook Computers

Hand-Held Instruments

Mini PCI & PCI-Express Cards

PCMCIA & New Cards

Portable Information Appliances

1A, Ultra-Low Dropout, Ultra-Fast CMOS LDO Regulator

Ordering Information

Marking Information

For marking information, contact our sales representative

directly or through a RichTek distributor located in your

area, otherwise visit our website for detail.

General Description

The RT9187 is a high-performance, 1A LDO regulator,

offering extremely high PSRR and ultra-low dropout. Ideal

for portable RF and wireless applications with demanding

performance and space requirements.

A noise reduction pin is also available for further reduction

of output noise. Regulator ground current increases only

slightly in dropout, further prolonging the battery life. The

RT9187 also works with low-ESR ceramic capacitors,

reducing the amount of board space necessary for power

applications, critical in hand-held wireless devices.

The RT9187 consumes less than 0.1

μAin shutdown mode

and has fast turn-on time less than 40

μs. The other features

include ultra-low dropout voltage, high output accuracy,

current limiting protection, and high ripple rejection ratio.

Available in the VDFN-8L 3x3 package.

(TOP VIEW)

VDFN-8L 3x3

Features

Ultra-Low-Noise for RF Application

Ultra-Fast Response in Line/Load Transient

μμμμμs)

< 0.1

μμμμμA Standby Current When Shutdown

Wide Operating Voltage Ranges : 2.5V to 5.5V

TTL-Logic-Controlled Shutdown Input

Current Limiting Protection

Thermal Shutdown Protection

Only 2.2

μμμμμF Output Capacitor Required for Stability

High Power Supply Rejection Ratio

RoHS Compliant and 100% Lead (Pb)-Free

RT9187(

Package Type

QV : VDFN-8L 3x3 (V-Type)

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

cial Standard)

None : Adjustable Output

Fixed Output Voltage Code

10 : 1.0V

12 : 1.2V

15 : 1.5V

18 : 1.8V

25 : 2.5V

28 : 2.8V

30 : 3.0V

33 : 3.3V

-

)

VIN

VOUT

VOUT

VIN

EN

BP/ADJ

NC

GND

7

6

5

1

2

3

4

8

9

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.