RT9911
6 Channel DC/DC Converters
General Description
The RT9911 is a complete power-supply solution for digital
still cameras and other hand-held devices. It integrates
one selectable Boost/Buck DC-DC converter, one high-
efficiency step-down DC-DC converter, one high-efficiency
main step-up converter, one PWM converter for CCD
positive voltage, one inverter for CCD negative voltage and
one white LED driver for
LCD backlight. The
RT9911 is
targeted for applications that use either two or three primary
cells or a single lithium-ion battery.
RT9911 is available in VQFN-40L 6x6. Each DC-DC converter
has independent shutdown input.
Features
1.6V to 5.5V Battery Input Voltage Range
Synchronous Boost/Buck Selectable DC-DC
Converter
Internal Switches
Up to 95% Efficiency
Syn-Buck DC-DC Converters
0.8V to 5.5V Adjustable Output Voltage
Up to 95% Efficiency
100%
(MAX)
Duty Cycle
Internal Switches
Main Boost DC-DC Converter
Adjustable Output Voltage
Up to 97% Efficiency
PWM Converter for CCD Positive Voltage
Inverter for CCD Negative Voltage
White LED Driver for LCD Panel Backlight
Up to 1.4MHz Adjustable Switching Frequency
1μA Supply Current in Shutdown Mode
μ
External Compensation Network for all Converters
Independent Enable Pin to Shutdown Each
Channel.
40-Lead VQFN Package
RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9911
Package Type
QV : VQFN-40L 6x6 (V-Type)
--
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
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.
Pin Configurations
(TOP VIEW)
SELECT
COMP2
PVDD2
30
29
28
27
26
25
24
41
23
22
21
11 12 13 14 15 16 17 18 19 20
EN6
EN5
EN4
EN3
EN2
EN1
Applications
Digital Still Camera
PDA
Protable Device
GND
OK2
RT
VREF
VDDM
GND
FB1
COMP1
PGND1
LX1
1
2
3
4
5
6
7
8
9
10
40 39 38 37 36 35 34 33 32 31
FB2
GND
LX2
PGND2
FB3
COMP3
CS3
DRN3
DRP3
VFB6
CFB6
COMP6
COMP5
FB5
COMP4
PVDD1
PVDD5
VQFN-40L 6x6
DS9911-04 August 2007
www.richtek.com
1
PVDD3
EXT5
EXT4
EXT6
FB4