RT9992 DC/DC Converters Datasheet

RT9992 Datasheet, PDF, Equivalent


Part Number

RT9992

Description

5+2 Channel DC/DC Converters

Manufacture

Richtek

Total Page 19 Pages
Datasheet
Download RT9992 Datasheet


RT9992
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.
Ordering Information
RT9992
Package Type
QW : WQFN-32L 4x4 (W-Type)
Note :
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
Z : Cu wire and Green (Halogen Free
with Commer-cial Standard)
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)
FB1
PGOOD
FB5
VOUT5
PVDD5
EN5
SEQ
LX2
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
VOUT6
LX6
EN6
PVDD3
LX3
EN3
FB3
FB4
WQFN-32L 4x4
DS9992-P04 May 2010
Features
z All Power MOSFETs Integrated
z 5 Channels with Internal Compensation
z Flexible Enabling Control
` Enabled Independently or in Preset Power On/
Off Sequences
z CH2 Synchronous Converter in Step-Up or Step-
Down Mode Selectable by SEL Pin
z Synchronous Step-Down DC/DC Converter
` Up to 95% Efficiency
` 100% (max) Duty Cycle
z Synchronous Step-Up DC/DC Converter
` Adjustable Output Voltage
` Up to 95% Efficiency
z 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
z Load Disconnect Function for CH1 and CH2
Synchronous Step-Up Converter
z Fixed 2MHz Switching Frequency for CH1, CH2,
CH3, and CH4
z Fixed 1MHz Switching Frequency for CH6
z Generic LDO (CH5)
` Output Voltage : Fixed 2.5V or Set by External
Feedback Network, Determined by FB5 Initial
Voltage
z RTC LDO : Fixed Output Voltage 3.1V
z Power Good Indicator to Monitor Output Voltage
Status of CH2, CH3, and CH4
z 32-Lead Package
z RoHS Compliant and Halogen Free
Applications
z CMOS DV
z Gaming
Marking Information
ES=YM
DNN
ES= : Product Code
YMDNN : Date Code
www.richtek.com
1

RT9992
RT9992
Preliminary
Typical Application Circuit
For 2AA :
3.3V
R10
100k
2 PGOOD RT9992
L1
LX1 31 2.2µH
VBAT
C14
1µF
1µF D1
D2
D3
R13
10
VBAT
L6
10µH
23 LX6
D4
24 VOUT6
25 FB6
29 BAT
C1
1µF
26 VDDM
C2
1µF 32 EN1
PVDD1 30
C3
10µF x 2
FB1 1
PVDD2 9
FB2 12
Chip Enable
VEN1234
VBAT
VBAT
VEN5
VBAT
5V
11 EN2
19 EN3
16 EN4
6 EN5
22 EN6
7 SEQ
27 PVDD6
13 SEL
VIN2 10 L2
LX2 8 2.2µH
PVDD3 21
L3
LX3 20 2.2µH
FB3 18
C5
10µF
R3
470k
R4
150k
C7
10µF
C8
10µF
C9
10µF
3.1V
3.3V
3V
C17
1µF
C15
0.1µF
C16
1µF
R11 C18
909k 4.7pF
R12
180k
28 RTCPWR
5 PVDD5
4 VOUT5
3 FB5
PVDD4 14
L4
LX4 15 2.2µH
FB4 17
C11
10µF
C12
10µF
GND 33 (Exposed Pad)
VBAT
R1
470k
5V
C4
4.7pF
R2
88.7k
C6
10µF*2
3.3V
C18
4.7pF
VBAT
5V/3.3V
R5
470k
R6
374k
1.8V
C10
33pF
VBAT
R7
187k
R8
374k
1.2V
C13
82pF
For above circuit, the power sequence is CH1 CH3 CH4CH2, while CH5 remains independent.
For other power sequence combinations, refer to the power on/ff sequence section in application information.
www.richtek.com
2
DS9992-P04 May 2010


Features Preliminary RT9992 5+2 Channel DC/DC C onverters for DV General Description T his is a 5+2CH integrated PMIC for DV a pplication. There are 5 DC/DC converter s : one synchronous step-up, one select able synchronous step-up/step-down, two synchronous step-downs, and one WLED d river in either asynchronous step-up or current source mode, selectable by VOU T6 initial voltage. In addition, there are 2 LDO regulators : one RTC LDO and one generic LDO. The generic LDO can ch oose internal feedback loop for fixed o utput 2.5V or external feedback loop fo r customized output voltage. Both low v oltage synchronous step-up converters a re with load disconnect function. All p ower MOSFETs and compensation networks are integrated. There is a power good i ndicator to monitor FB2, FB3, and FB4 v oltage status. CH1 to CH5 enabling can be controlled flexibly : enabled indepe ndently or in preset sequences. Orderi ng Information RT9992 Package Type QW : WQFN-32L 4x4 (W-Type) Note : Operating Temperature Range G .
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