RT9267CC

Manufacturer Part NumberRT9267CC
ManufacturerRichtek Technology Corporation
RT9267CC datasheet
 
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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 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
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.
Ordering Information
RT9267
Package type
C : TSSOP-16
Operating temperature range
C: Commercial standard
DS9267-02 September, 2002
Preliminary
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 40µA for the Whole IC
High Switching Rate 550KHz
Built-In 2A Switching NMOS
Two Separated Chip Enable Control Pins
2% Accuracy for All Channels
PWM
loop
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)
RT9267
Pin Configurations
TOP VIEW
LX1
1
16
VDD
2
CE1
15
FB1
3
14
GND
LFB
4
13
CE2
NC
5
12
NC
LDOO
6
11
LX2
FB2
NC
7
10
LBI
GND
8
9
LBO
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RT9267CC Summary of contents