DC/DC Converter. RT9986A Datasheet

RT9986A Converter. Datasheet pdf. Equivalent

RT9986A Datasheet
Recommendation RT9986A Datasheet
Part RT9986A
Description 7-CH DC/DC Converter
Feature RT9986A; RT9986A 7-CH DC/DC Converter for DSC General Description The RT9986A is a complete power supply so.
Manufacture Richtek Technology Corporation
Datasheet
Download RT9986A Datasheet




Richtek Technology Corporation RT9986A
RT9986A
7-CH DC/DC Converter for DSC
General Description
The RT9986A is a complete power supply solution for
digital still cameras and other handheld devices. It includes
one synchronous step-up DC/DC converter with load
disconnect, one selectable synchronous step-up/step-
down DC/DC converter, two synchronous step-down DC/
DC converters, one synchronous high voltage step-up DC/
DC converter, one inverting DC/DC converter, and one
selectable synchronous high voltage step-up/current-
source for WLED. In addition, the RT9986A also includes
one RTC_LDO, one voltage detector, and one System
Reset. All power MOSFETs are integrated in the RT9986A.
The RT9986A 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 synchronous high voltage step-up output for CCD
bias power supply
CH6 is an inverting output for negative CCD bias power
supply
CH7 is a selectable synchronous high voltage step-up/
current source for driving WLED
The selectable step-up/step-down converter can be auto
selected by external component topology. For the
RT9986A, all 7-CHs have built in internal compensation.
The RT9986A also provides a transformerless inverting
converter for supplying CCD power. For the low voltage
synchronous step-up and step down converters, efficiency
can be up to 95%.
The RT9986A provides comprehensive protection features
including over current protection, thermal shutdown
protection, over voltage protection, overload protection,
and under voltage protection.
Features
z CH2 Step-Up/Step-Down Auto-Selected by External
Topology
z Preset On/Off Sequence of CH1, CH2, CH3, CH4
(1 3 4 2)
z Preset On/Off Sequence of CH5, CH6 (5 6)
z All Channels with Internal Compensation
z All Power Switches Integrated
z All Step-Up Converter with Load Disconnect
z Step-Down DC/DC Converter
` Up to 95% Efficiency
` 100% (max) Duty Cycle
z Low Voltage Step-Up DC/DC Converter
` Adjustable Output Voltage
` Up to 95% Efficiency
z WLED Driver
` Auto-Selected by External Topology
` Current Source Mode with 30mA DC Current
` Step-Up Mode with LED Open Protection (OVP7)
` Direct PWM Dimming Control
z Fixed 2MHz Switching Frequency for CH1/2/3/4,
Fixed 1MHz Switching Frequency for CH5/6/7
z Small 32-Lead WQFN Package
z RoHS Compliant and Halogen Free
Applications
z Digital Still Camera
z PDA
z Portable Devices
Marking Information
EZ= : Product Code
EZ=YM
DNN
YMDNN : Date Code
DS9986A-00 May 2011
www.richtek.com
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Richtek Technology Corporation RT9986A
RT9986A
Ordering Information
RT9986A
Package Type
QW : WQFN-32L 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.
Pin Configurations
(TOP VIEW)
FB1
VREF
FB6
VOUT6
FB7
PVDD7
LX7
EN7
32 31 30 29 28 27 26 25
1 24
2 23
3 22
4
GND
21
5 20
6 33 19
7 18
8 17
9 10 11 12 13 14 15 16
FB2
SYSR
RTCPWR
VDDM
LX5
PVDD5
FB5
RST
WQFN-32L 4x4
www.richtek.com
2
DS9986A-00 May 2011



Richtek Technology Corporation RT9986A
Typical Application Circuit
For 2AA
RT9986A
15V
-7V
VBAT
VBAT
C1
1µF
C2
4.7µF
L5
10µH
C14
4.7µF
C13
10µF x 2
R9
287k
R10
26.1k
C12
27pF
C18
10µF x 2
D1
L6
C15
1nF
R11 10µH
66.5k
R12
10.5k
C16
0.1µF
C17
0.1µF
D5
5V
ON
OFF
21 VDDM
PVDD1 30
29 BAT
RT9986A
1
FB1
C21 R1
4.7pF 470k
R2
88.7k
20 LX5
L1
LX1 31 2.2µH
C3
4.7µF
19 PVDD5
18 FB5
4 VOUT6
28 LX6
3 FB6
2 VREF
13 VNEG
7 LX7
6 PVDD7
5 FB7
8 EN7
25 EN1234
32 EN56
PVDD2 27
FB2 24
C22
4.7pF
L2
LX2 26 2.2µH
R3
470k
R4
150k
C5
4.7µF
PVDD3 15
L3
LX3 16 2.2µH
C7
4.7µF
FB3 14
R5
768k
R6
360k
PVDD4 10
LX4 9
L4
2.2µH
FB4 11
C9
10µF
R7
470k
R8
374k
5V
C4
10µF x 2
VBAT
3.3V
C6
10µF x 2
VBAT
5V
C8
10µF
2.5V
5V or VBAT
C10
10µF
1.8V
RTCPWR
3.3V
R15
100k
12 VCHK
R14
10k 17 RST
23 SYSR
22
RTCPWR
GND 33 (Exposed Pad)
C11
Super Cap
DS9986A-00 May 2011
www.richtek.com
3







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