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RT9267 Datasheet

  • RT9267

  • Step-up DC/DC Converter

  • 10頁

  • ETC

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Preliminary
RT9267
High Efficiency, Low Quiescent, Triple output DC-DC Converter
General Descriptions
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 40碌A(chǔ) 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 500kHz 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.
Features
Two Channels of Adaptive PWM Controllers
One Channel of Low Dropout Regulator
One Voltage Detector
Low Start-Up Voltage 1.0V
Low Quiescent Current 40碌A(chǔ) for the Whole IC
High Switching Rate 550KHz
Built-In 2A Switching NMOS
Two Separated Chip Enable Control Pins
2% Accuracy for All Channels
Minimized External Components
Small TSSOP-16 Package
Applications
PDA
Portable Instrument
Wireless Equipment
DSC
LCD Back Bias Circuit
RF-Tags
Pin Configurations
Part Number
RT9267CC
(Plastic TSSOP-16)
LX1
1
CE1
2
GND
3
CE2
4
NC
5
LX2
6
Pin Configurations
TOP VIEW
16
15
14
13
12
11
10
9
VDD
FB1
LFB
NC
LDOO
FB2
LBI
LBO
Ordering Information
RT9267
Package type
C : TSSOP-16
Operating temperature range
C: Commercial standard
NC
7
GND
8
DS9267-02 September, 2002
www.richtek.com
1

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