RT9267 Datasheet, PDF (1/9 Pages) Richtek Technology Corporation – High Efficiency, Low Quiescent, Triple Output DC-DC Converter

Preliminary
RT9267
High Efficiency, Low Quiescent, Triple Output DC-DC Converter
General Description
The RT9267 is a triple output DC-DC converter IC
including two adaptive PWM controllers, one low dropout
regulator, and one voltage detector. RT9267 is capable
of delivering hundreds of mA output current and consumes
only 40μA quiescent current for the whole IC.
The adaptive PWM controllers are configured for boost
applications with built-in 2A NMOS for each channel. The
proprietary adaptive PWM loop provides PWM operation
for heavier output loading conditions and PFM for lighter
loading, with seamless auto-transition. The 550kHz
switching rate reduces the size of external passive
components.
The low dropout linear regulator (LDO) is designed with a
built-in 300mA PMOS, providing 1mV/mA low dropout
voltage with respect to variant output current values.
The voltage detector provides the supervisory function
with open collector pull-low output. All the 4 function units
are adjustable, and each can be set with two resistors in
divider connection. The reference voltage for each
channel is set to 1.25V for the two adaptive PWM
controllers, and 0.86V for the LDO and the voltage
detector.
The RT9267 is in TSSOP 16 pin package which fits space-
limited hand held devices well.
Ordering Information
RT9267
Package Type
C : TSSOP-16
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
z Two Channels of Adaptive PWM Controllers
z One Channel of Low Dropout Regulator
z One Voltage Detector
z Low Start-Up Voltage 1.0V
z Low Quiescent Current 40μA for the Whole IC
z High Switching Rate 550kHz
z Built-In 2A Switching NMOS
z Two Separated Chip Enable Control Pins
z 2% Accuracy for All Channels
z Minimized External Components
z Small TSSOP-16 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z PDA
z Portable Instrument
z Wireless Equipment
z DSC
z LCD Back Bias Circuit
z RF-Tags
Pin Configurations
(TOP VIEW)
LX1
EN1
GND
EN2
NC
LX2
NC
GND
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
TSSOP-16
VDD
FB1
LFB
NC
LDOO
FB2
LBI
LBO
DS9267-08 March 2007
www.richtek.com
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