RT9953
1
4+1 CH Power Management IC
Ordering Information
Note :
Richtek products are :
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RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
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Suitable for use in SnPb or Pb-free soldering processes.
Features
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One Synchronous Step-Up/Step-Down Selectable
Converter
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Support 2AA or Li-ion Battery Applications
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Internal Soft-Start Control
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4 CHs with Internal Compensation
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Power Switches Integrated
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Up to 95% Efficiency
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100% (max) Duty Cycle for Step-Down Converter
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Adjustable Output Voltage
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Fixed 1MHz Switching Frequency
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LDO Works with Low-ESR Ceramic Capacitors
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Fast Line/Load Transient Response
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High PSRR Linear Regulator
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RoHS Compliant and Halogen Free
General Description
The RT9953 is a complete power supply solution for digital
still cameras and other handheld devices. The RT9953 is
a multi-CH power management IC including one
synchronous step-up DC/DC converter, one selectable
synchronous step-up/step-down DC/DC converter, two
synchronous step-down DC/DC converters, and one low
dropout linear regulator.
The RT9953 is designed to fulfill the applications for DSC
as follows :
CH1 is a synchronous step-up output for motor or DSC
system I/O power
CH2 is a selectable synchronous step-up/step-down
output for motor or DSC system I/O power
CH3 and CH4 are synchronous step-down outputs for DSP
core and memory power supply
CH5 is a 500mA, low dropout, low noise linear regulator
with soft-start function.
The RT9953 is designed to support Li+ and 2AA battery
applications. The selectable step-up/step-down converter
can be set by SEL pin. For the synchronous step-up and
step down converters, the efficiency can be up to 95%.
The RT9953 provides over current protection, thermal
shutdown protection, over voltage and under voltage
protection to achieve complete protection. The RT9953 is
available in the WQFN-24L 4x4 package.
Applications
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CMOS Digital Still Camera
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CMOS DV
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Portable Devices
Pin Configurations
(TOP VIEW)
WQFN-24L 4x4
LX1
PVDD1
EN3
FB4
SS
PVDD4
LX2
PVDD2
FB3
EN2
PVDD3
LX3
LX4
EN5
VOUT5
PVDD5
FB5 FB2
SEL
EN1
GND
FB1
EN4
VDDM
1
2
3
4
5
6
7
21 20 19
18
17
16
15
8910 12
14
13
24 2223
11
GND
25
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
RT9953
Package Type
QW : WQFN-24L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
联系人:钟先生0755-83983280
E-mail:nikozhong@hotmail.com http//www.sacpower.net
SacPower 智联创新