RT9917 Datasheet, PDF (1/20 Pages) Richtek Technology Corporation – 7 Channel DC/DC Converters

RT9917
7 Channel DC/DC Converters
General Description
The RT9917 is a complete power-supply solution for digital
still cameras and other hand-held devices.
It integrates :
CH1 : Boost DC-DC converter with load disconnect
controller (SW1).
CH2 : Selectable Boost/Buck DC-DC converter
CH3 : Step-down DC-DC converter with internal
compensation.
CH4 : Step-down DC-DC converter with internal
compensation.
CH5 : DC/DC converter with HV NMOS, internal
compensation and load disconnect (SW5) for CCD positive
supply.
CH6 : DC/DC converter with HV PMOS for CCD negative
supply.
CH7 : WLED driver with HV NMOS, internal compensation
and allow for PWM dimming.
SW1 : Load disconnect controller for CH1.
SW5 : Load disconnect switch for CH5.
Features
z 1 Channel Boost/Buck Selectable by SEL Pin
z 2 Selectable On/Off Sequence Set by SEQ Pin
z 4 Channels with Internal Compensation
z Provide Charge Pump Voltage to Enhance NMOS
Gate Driving Capability for Alkaline Battery Input
z All Power Switches Integrated
z Syn Step-Down DC/DC Converter
` Up to 95% Efficiency
` 100% _(MAX) Duty Cycle
z Syn Step-Up DC/DC Converter
` Adjustable Output Voltage
` Up to 95% Efficiency
z Open LED Protection
z Transformerless Inverting Converter for CCD
z Fixed 1MHz Switching Frequency
z Compact 40-Lead WQFN Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Digital Still Camera
z PDA
z Portable Device
Ordering Information
RT9917
Pin Configurations
(TOP VIEW)
Package Type
QW : WQFN-40L 5x5 (W-Type)
Note :
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
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.
40 39 38 37 36 35 34 33 32 31
PVDD1 1
30 _PVDD2
LX6 2
29 _VDDM
PVDD6 3
28 CFB7
CP 4
27 GND
CN 5
CPO 6
GND
26 LX7
25 LX5
FB6 7
24 VOUT7
FB4 8
COMP6 9
23 FB3
41
22 EN7
LX4 10
21 LX3
11 12 13 14 15 16 17 18 19 20
DS9917-03 April 2011
WQFN-40L 5x5
www.richtek.com
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