Preliminary
RT9992
5+2 Channel DC/DC Converters for DV
General Description
This is a 5+2CH integrated PMIC for DV application. There
are 5 DC/DC converters : one synchronous step-up, one
selectable synchronous step-up/step-down, two
synchronous step-downs, and one WLED driver in either
asynchronous step-up or current source mode, selectable
by VOUT6 initial voltage. In addition, there are 2 LDO
regulators : one RTC LDO and one generic LDO. The
generic LDO can choose internal feedback loop for fixed
output 2.5V or external feedback loop for customized
output voltage. Both low voltage synchronous step-up
converters are with load disconnect function. All power
MOSFETs and compensation networks are integrated.
There is a power good indicator to monitor FB2, FB3, and
FB4 voltage status. CH1 to CH5 enabling can be controlled
flexibly : enabled independently or in preset sequences.
Features
All Power MOSFETs Integrated
5 Channels with Internal Compensation
Flexible Enabling Control
Enabled Independently or in Preset Power On/
Off Sequences
CH2 Synchronous Converter in Step-Up or Step-
Down Mode Selectable by SEL Pin
Synchronous Step-Down DC/DC Converter
Up to 95% Efficiency
100% (max) Duty Cycle
Synchronous Step-Up DC/DC Converter
Adjustable Output Voltage
Up to 95% Efficiency
Asynchronous Step-Up Converter to Drive WLED,
Selectable Between Step-Up or Current Source
LED Open Protection (OVP6) in Step-Up Mode
PWM Dimming Control
Load Disconnect Function for CH1 and CH2
Synchronous Step-Up Converter
Fixed 2MHz Switching Frequency for CH1, CH2,
CH3, and CH4
Fixed 1MHz Switching Frequency for CH6
Generic LDO (CH5)
Output Voltage : Fixed 2.5V or Set by External
Feedback Network, Determined by FB5 Initial
Voltage
RTC LDO : Fixed Output Voltage 3.1V
Power Good Indicator to Monitor Output Voltage
Status of CH2, CH3, and CH4
32-Lead Package
RoHS Compliant and Halogen Free
Ordering Information
RT9992
Package Type
QW : WQFN-32L 4x4 (W-Type)
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
Z : Cu wire and Green (Halogen Free
with Commer-cial Standard)
Note :
Richtek 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.
Pin Configurations
(TOP VIEW)
EN1
LX1
PVDD1
BAT
RTCPWR
PVDD6
VDDM
FB6
Applications
24
23
22
21
20
19
18
17
32 31 30 29 28 27 26 25
FB1
PGOOD
FB5
VOUT5
PVDD5
EN5
SEQ
LX2
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
GND
33
VOUT6
LX6
EN6
PVDD3
LX3
EN3
FB3
FB4
CMOS DV
Gaming
Marking Information
ES= : Product Code
WQFN-32L 4x4
DS9992-P04 May 2010
www.richtek.com
1
PVDD2
VIN2
EN2
FB2
SEL
PVDD4
LX4
EN4
ES=YM
DNN
YMDNN : Date Code
Preliminary
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
(Exposed pad)
Pin Name
FB1
PGOOD
FB5
VOUT5
PVDD5
EN5
SEQ
LX2
PVDD2
VIN2
EN2
FB2
SEL
PVDD4
LX4
EN4
FB4
FB3
EN3
LX3
PVDD3
EN6
LX6
VOUT6
FB6
VDDM
PVDD6
RTCPWR
BAT
PVDD1
LX1
EN1
GND
Pin Function
Feedback Input Pin of CH1. High impedance in shutdown.
Power Good Indicator Output Pin (Open Drain).
Feedback Input Pin of CH5. High Impedance in Shutdown.
Output Pin for CH5. High Impedance in Shutdown.
RT9992
Power Input Pin of CH5.
Enable Pin of CH5.
SEQ = H to use preset power on/off sequence. SEQ = L to independently
enable CH1 to 5. Logic state can’t be changed during operation.
Switch Node of CH2. High Impedance in Shutdown.
Power Input Pin of CH2 in Step-Down or Power Output Pin of CH2 in
Step-Up.
Power Input Node of CH2 in Step-Up.
Enable Pin of CH2 or Enable Pin of Preset On/Off Sequence.
Feedback Input Pin of CH2. High Impedance in Shutdown.
Select Pin to Define CH2 in Step-Down (SEL = H) or Step-Up (SEL = L)
Mode. Logic state can’t be changed during operation.
Power Input Pin of CH4.
Switch Node of CH4. High Impedance in Shutdown.
Enable Pin of CH4 or Select which Preset On/Off Sequence.
Feedback Input Pin of CH4. High Impedance in Shutdown.
Feedback Input Pin of CH3. High Impedance in Shutdown.
Enable Pin of CH3 or Select which Preset On/Off Sequence.
Switch Node of CH3. High Impedance in Shutdown.
Power Input Pin of CH3.
Enable Pin of CH6 and PWM Dimming Input Signal Pin.
Switch Node of CH6 in Step-Up Mode. High Impedance in Shutdown.
Sense Pin for CH6 Output Voltage in Step-Up Mode and CH6 Mode Selection
Pin.
Feedback Input Pin of CH6 in Step-Up Mode or Current Sink Pin of CH6 in
Current Source Mode.
Internal Control Circuit Power Pin. That must connect to a bypass capacitor
for better noise rejection.
Power Input Pin of CH6 NMOS Driver.
RTC Power Output Pin.
Battery Power Input Pin and CH1 Step-Up Power Input Node.
Power Output Pin of CH1.
Switch Node of CH1. High Impedance in Shutdown.
Enable Pin of CH1.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
DS9992-P04 May 2010
www.richtek.com
5
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