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PDF RT9971 Data sheet ( Hoja de datos )
| Número de pieza | RT9971 | |
| Descripción | 7 CH Power Management IC | |
| Fabricantes | Richtek | |
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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
1 page  
RT9971
Table 1. Recommended Components for the Typical Application Circuit
Channel
CH3
Formula
VOUT_CH3 = (1+R7/R8) x 0.8
VOUT_CH3 (V)
2.5
1.8
1.5
1.3
1.2
1
L3 (µH)
4.7 4.7 4.7 4.7 4.7 4.7
R7 (kΩ)
768 470 330 237 187 23.2
R8 (kΩ)
360 374 374 374 374 93.1
C10 (pF) 22 33 47 68 82 47
C9 (µF)
10 10 10 10 10 10
Channel
Application
VOUT_CH4 (V)
L4 (µH)
R9 (kΩ)
R10 (kΩ)
C13 (pF)
C12 (µF)
2.5
4.7
768
360
22
10
CH4
VOUT_CH4 = (1+R9/R10) x 0.8
1.8 1.5 1.3
4.7 4.7 4.7
470 330 237
374 374 374
33 47 68
10 10 10
1.2
4.7
187
374
82
10
1
4.7
23.2
93.1
47
10
Channel
Formula
VOUT_CH5 (V)
L5 (µH)
R11 (kΩ)
R12 (kΩ)
C15 (pF)
C16 (µF)
12
10
820
95.3
1000
10/16V
CH5
VOUT_CH5 = (1+R11/R12) x 1.25
13 14 15 15.5
10 10 10 10
820 953 1000 820
86.6 93.1 90.9 71.5
1000
1000
1000
1000
10/16V
10/25V 10/25V 10/25V
16
10
886
75
1000
10/25V
Channel
Formula
VOUT_CH6 (V)
L6 (µH)
R13 (kΩ)
R14 (kΩ)
C17 (pF)
C18 (µF)
CH6
VOUT_CH6 = (R13/R14) x (-1.25) * R13+R14 <90k
-6 -6.3 -7 -7.5 -8
10 10 10 10 10
57.6 69.8 63.4
68
68
12 13.7 11.3 11.3 10.5
1000
1000
1000
1000
1000
10 x 2pcs. 10 x 2pcs. 10 x 2pcs. 10 x 2pcs. 10 x 2pcs.
DS9971-01 April 2011
www.richtek.com
5
5 Page 
RT9971
Parameter
Symbol
Test Condition
Min Typ Max Unit
RTC LDO, CN = High
Input Voltage Range
Standby Current
Output Voltage
Maximum Output Current
Dropout Voltage
VIN
VOUT
VDROP
VIN = 4.2V
IOUT = 0mA
VIN = 4.2V
IOUT = 20mA
-- -- 5.5 V
-- 5 8 µA
-- 3.25 3.3
V
60 --
-- mA
-- -- 200 mV
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These
are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated
in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions
for extended periods may remain possibility to affect device reliability.
Note 2. θJA is measured in the natural convection at TA = 25°C on a high effective four layers thermal conductivity test
board of JEDEC 51-7 thermal measurement standard. The case point of θJC is on the exposed pad for the WQFN
package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
DS9971-01 April 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet RT9971.PDF ] | |
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