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RT9902 データシート(PDF) 1 Page - Richtek Technology Corporation

部品番号 RT9902
部品情報  4 Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down
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メーカー  RICHTEK [Richtek Technology Corporation]
ホームページ  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9902 データシート(HTML) 1 Page - Richtek Technology Corporation

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RT9902
Preliminary
1
DS9902-10 August 2007
www.richtek.com
Features
1.5V to 5.5V Battery Input Voltage Range
Main step-up DC-DC Converter
1.5V to 5.5V Adjustable Output Voltage
Up to 90% Efficiency
2.6A, 0.3
Ω
Ω
Ω
Ω
Ω Internal Power Switch
Two Step-Down DC-DC Converters
0.8V to 5.5V Adjustable Output Voltage
94% Efficiency
100% Duty Cycle
Step-up Charge Pump for Micro-Controller
Linear Controller for Linear Regulator
Up to 1.4MHz Switching Frequency
1
μμμμμA Supply Current in Shutdown Mode
Programmable Soft Start Function
Independent Enable Pin (CH1, CH2, CH3)
External Compensation Network (CH1, CH2, CH3)
Short Circuit Protection (CH1, CH2, CH3)
Over Voltage Protection (CH2)
32-Lead VQFN Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Digital Still Cameras
PDAs
Portable Devices
4 Channel DC/DC Converters IC with High-Efficiency Step-Up
and Step-Down
Ordering Information
General Description
The RT9902 is a complete power supply solution for digital
still cameras and other hand-held devices. It integrates a
high-efficiency main step-up DC-DC converter, two high-
efficiency step-down converters, a charge pump, and a
linear controller that drives an external P-MOSFET for linear
regulator. The RT9902 is targeted for applications that use
either two or three AA cells or a single lithiumion battery.
The main step-up DC-DC converter accepts inputs from
1.5V to 5.5V and build in 2.6A Internal switch. The two
step-down DC-DC converters (CH2, CH3) accept inputs
from 1.5V to 5.5V and regulate a resistor adjustable
output from 0.8V to 5.5V. Each DC-DC converter has
independent shutdown input.
The feature of the charge pump is to deliver few current
to micro-controller when the system operates in the
standby mode. RT9902 includes a linear controller with
0.8V reference voltage. An adjustable operating frequency
(up to 1.4MHz) is utilized to get optimum size, cost, and
efficiency.
RT9902 is available in VQFN-32L 5x5 package.
Pin Configurations
(TOP VIEW)
VQFN-32L 5x5
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.
RT9902
Package Type
QV : VQFN-32L 5x5 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
COMP3
VDD3
LX3
PGND3
SS
LDO_O
RT
GND
VDD2
VDD2
LX2
LX2
PGND2
LX1
LX1
VDD1
1
2
3
4
5
6
7
21
20
19
18
17
16
15
8
910 11 12
14
13
28 27 26 25
24
22
23
32 31 30 29
GND
33


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