RT9953 Datasheet, PDF (1/19 Pages) Richtek Technology Corporation – 4+1 CH Power Management IC

RT9953
4+1 CH Power Management IC
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.
Ordering Information
RT9953
Package Type
QW : WQFN-24L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek 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.
Features
z One Synchronous Step-Up/Step-Down Selectable
Converter
z Support 2AA or Li-ion Battery Applications
z Internal Soft-Start Control
z 4 CHs with Internal Compensation
z Power Switches Integrated
z Up to 95% Efficiency
z 100% (max) Duty Cycle for Step-Down Converter
z Adjustable Output Voltage
z Fixed 1MHz Switching Frequency
z LDO Works with Low-ESR Ceramic Capacitors
z Fast Line/Load Transient Response
z High PSRR Linear Regulator
z RoHS Compliant and Halogen Free
Applications
z CMOS Digital Still Camera
z CMOS DV
z Portable Devices
Pin Configurations
(TOP VIEW)
24 23 22 21 20 19
LX1 1
PVDD1 2
18 LX2
17 PVDD2
EN3 3
FB4 4
GND
16 _VDDM
15 FB3
SS 5
PVDD4 6
14 EN2
25 _{13 PVDD3}
7 8 9 10 11 12
WQFN-24L 4x4
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9953-02 April 2011
www.richtek.com
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