RT9187
1A, Ultra-Low Dropout, Ultra-Fast CMOS LDO Regulator
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 0.1uA in shutdown mode
and has fast turn-on time less than 40μs. 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 and SOP-8 (Exposed Pad)
package.
Features
Ultra-Low-Noise for RF Application
Ultra-Fast Response in Line/Load Transient
Quick Start-Up
(Typically 40μs)
μ
< 0.1uA Standby Current When Shutdown
Low Dropout : 240mV
at 1A
Wide Operating Voltage Ranges : 2.5V to 5.5V
TTL-Logic-Controlled Shutdown Input
Current Limiting Protection
Thermal Shutdown Protection
Only 2.2uF Output Capacitor Required for Stability
High Power Supply Rejection Ratio
RoHS Compliant and 100% Lead (Pb)-Free
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
Ordering Information
RT9187(
-
)
Package Type
QV : VDFN-8L 3x3 (V-Type)
SP : SOP-8 (Exposed Pad-Option 1)
Operating Temperature Range
P : Pb Free with Commercial Standard
For marking information, contact our sales representative
G : Green (Halogen Free with Commer-
directly or through a RichTek distributor located in your
cial Standard)
area, otherwise visit our website for detail.
None : Adjustable Output
Fixed Output Voltage Code
Pin Configurations
10 : 1.0V
(TOP VIEW)
11 : 1.1V
:
8
EN
VIN
1
32 : 3.2V
7
NC
VIN
2
33 : 3.3V
6
GND
VOUT
3
9
5
BP/ADJ
VOUT
4
1L : 1.34V
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.
VIN
VIN
VOUT
VOUT
2
8
7
GND
3
6
9
4
5
EN
NC
GND
BP/ADJ
Marking Information
VDFN-8L 3x3
SOP-8 (Exposed Pad)
DS9187-09 April 2008
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
