Management IC. RT9971 Datasheet

RT9971 IC. Datasheet pdf. Equivalent

RT9971 Datasheet
Recommendation RT9971 Datasheet
Part RT9971
Description 7 CH Power Management IC
Feature RT9971; RT9971 7 CH Power Management IC General Description The RT9971 is a complete power supply solution.
Manufacture Richtek
Datasheet
Download RT9971 Datasheet




Richtek RT9971
RT9971
7 CH Power Management IC
General Description
The RT9971 is a complete power supply solution for digital
still cameras and other hand held devices. The RT9971 is
a multi-channel power management IC including two step-
up DC/DC converters, two step-down DC/DC converters,
one selectable step-up/step-down DC/DC converter, one
inverting DC/DC converter and one WLED driver.
The RT9971 is designed to fulfill the applications for DSC
just 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 high voltage step-up output for CCD bias power
supply
CH6 is an inverting output for negative CCD bias power
supply
CH7 is a high voltage step-up output for driving WLED
For the CH2, the step-up or step-down converter, operation
mode can be selected by the SEL pin. Among all CHs,
there are 5 CHs with the built-in internal compensation.
The RT9971 also provides a transformerless inverting
converter for supplying the CCD power. For the
synchronous step-up and step down converters, the
efficiency can be up to 95%. The IC provides load
disconnection for CH 1 and CH 5. The IC has selectable
RTC_LDO/SW1 that can be determined by the CN pin.
The RT9971 is able to support Li-ion and 2AA battery
applications. The RT9971 provides WLED open protection,
current limit, thermal shutdown protection, over voltage
and under voltage protection to achieve complete
protection. The RT9971 is available in WQFN-40L 5x5
package.
Features
l One Synchronous Step-Up or Step-Down
Selectable Convertor
l Support 2AA or Li-ion Battery Applications
l Preset On/Off Sequence
l 5 CHs with Internal Compensation
l All Power Switches Integrated
l Up to 95% Efficiency
l 100% (max) Duty Cycle for Step-Down Converter
l Adjustable Output Voltage
l LED PWM Dimming Control
l LED Open Protection
l Transformerless Inverting Converter for CCD
l Fixed 1MHz Switching Frequency at CH1 to CH7
l RTC_LDO/SW1 Selectable by CN Pin
l 40-Lead WQFN Package
l RoHS Compliant and Halogen Free
Applications
l Digital Still Camera
l PDA
l Portable Device
Ordering Information
RT9971
Package Type
QW : WQFN-40L 5x5 (W-Type)
Note :
Lead Plating System
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.
DS9971-01 April 2011
www.richtek.com
1



Richtek RT9971
RT9971
Pin Configurations
(TOP VIEW)
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
PNEG 6
GND
26 LX7
25 LX5
FB6 7
FB4 8
EN6 9
24 VOUT7
23 FB3
41
22 EN7
LX4 10
21 LX3
11 12 13 14 15 16 17 18 19 20
WQFN-40L 5x5
www.richtek.com
2
DS9971-01 April 2011



Richtek RT9971
RT9971
Typical Application Circuit
For 2AA
VOUT_SW1
3.3V
VOUT_CH2
5V
3V3
3V3
Q1
C1
10µF
VBAT
VOUT_CH1
3V3
R19 R1
50k 470k
R2
150k
L1
2.2µH
C22
10µF
40 LX1
C2
4.7pF
1 PVDD1
C27
10µF x 2
C3
560pF
R3
39k
37 FB1
38 COMP1
VBAT
L2 2.2µH
C4
10µF
C5
10µFx2
R4
470k
R5
88.7k
C6
4.7pF
C7
560pF
R6
39k
36 OK
35 VOUT1
31 LX2
30 PVDD2
34 FB2
33 COMP2
C8
10uF
VOUT_CH3
2.5V
C9
10µF
R7
768k
R8
360k
L3
4.7µH
C10
22pF
20 PVDD3
21 LX3
23 FB3
VOUT_CH4
C11 1.8V
10uF
C12
10µF
L4
4.7µH
11 PVDD4
10 LX4
R9
470k
C13
33pF
R10
374k
ON
OFF
8 FB4
39 EN2
32 EN134
12 EN5
9 EN6
VBAT
17 SEL
22 EN7
3V3
C23
1µF
VBAT
29
VDDM
LX5 25
SW5O 13
SW5I 14
L5
10µH
C24
1µF
D3 C14
10µF/25V
15V
RT9971
FB5 15
PVDD6 3
C15
1nF
C25
VBAT
1µF
L6
10µH
R11
1000k
R12
90.9k
VOUT_CH5
15V
C16
10µF/25V
LX6 2
FB6 7
VREF 16
LX7 26
VOUT7 24
CFB7 28
RTC_R 18
19
RTC_PWR
CP 4
CN 5
PNEG 6
VOUT_CH6
D4
-7V
R13
63.4k
C17
1nF
C18
10µF/16V x 2
R14
11.3k
10Lµ7H
C26
1µF
D5
C19
0.1µF
VBAT
WLED
D1
C20
D2 1µF/16V
RTC Reset
R16
10k
RTC 3.25V
C28
0.1µF
R15
10
C29
1µF
GND 27, Exposed Pad (41)
Note :
(1) SEL = High, CH2 is Step -Up, CN Connect to CAP
(2) VBAT = 1.8V to 3.2V
Timing Diagram
Power On Sequence : CH1 Step -Up 3.3VCH3 Step -Down 2.5VCH4 Step -Down 1.8V(CH2 Step -Up 5V and
SW1 3.3V)
Power Off Sequence : (CH2 Step -Up 5V and SW1 3.3V) CH4 Step -Down 1.8VCH3 Step -Down 2.5VCH1
Step -Up 3.3V
VDDM
EN2, EN134
VOUT_CH1 3.3V
VOUT_CH3 2.5V
VOUT_CH4 1.8V
VOUT_SW1 3.3V
VOUT_CH2 5V
User define
3.5ms
3.5ms
3.5ms
3.5ms
3.5ms
IC shutdown
Wait until FB3 < 0.1V
Wait until FB4 < 0.1V
Wait until VOUT1 < 0.4V
Depends on loading
DS9971-01 April 2011
www.richtek.com
3







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