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PDF RT9919 Data sheet ( Hoja de datos )
| Número de pieza | RT9919 | |
| Descripción | 7 Channel DC/DC Converters | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT9919
7 Channel DC/DC Converters
General Description
The RT9919 is a complete power supply solution for digital
still cameras and other hand held devices. The RT9919 is
a multi-channel DC/DC converter 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 RT9919 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 selectable step-up/step-down converter, the Boost/
Buck can be selected by the SEL pin. Among all channels,
there are 5 channels with the built-in internal
compensation. The RT9919 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 channel 1 and channel 5. The IC
has selectable RTC_LDO/SW1 that can be determined
by the CN pin.
The RT9919 is able to support Li+ and 2AA battery
applications. The RT9919 provides WLED open protection,
current limit, thermal shutdown protection, over voltage
and under voltage protection to achieve complete
protection. The RT9919 is available in WQFN-40L 5x5
package.
Features
l 1 Channel Syn Boost/Buck Selectable
l 2AA/Li Application Topologies Set by SEL Pin
l Preset On/Off Sequence
l 5 Channels with Internal Compensation
l All Power Switches Integrated
l Syn Step-Down DC/DC Converter :
} Up to 95% Efficiency
} 100% (max) Duty Cycle
l Syn Step-Up DC/DC Converter :
} Adjustable Output Voltage
} Up to 95% Efficiency
l Open LED Protection
l Transformerless Inverting Converter for CCD
l Fixed 2MHz Switching Frequency at CH1 to CH4
l Fixed 1MHz Switching Frequency at CH5 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
RT9919
Note :
Package Type
QW : WQFN-40L 5x5 (W-Type)
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.
DS9919-01 April 2011
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com
1 page  
RT9919
Table 1
Channel
CH3
Formula
VOUT = (1+R7/R8) x 0.8
VOUT (V) 2.5 1.8 1.5 1.3 1.2 1.0
L3 (uH)
2.2 2.2 2.2 2.2 2.2 2.2
R7 (kΩ)
768 470 330 237 187 23.2
R 8 (kΩ)
360 374 374 374 374 93.1
C10 (pF) 22 33 47 68 82 47
COUT (uF)
10
10
10
10
10
10
Channel
Applica tion
VOUT (V)
L4 (uH)
R9 (kΩ)
R 10 (kΩ)
C13 (pF)
COUT (uF)
2.5
2.2
7 68
3 60
22
10
CH 4
VOUT = (1+R9/R10) x 0.8
1.8 1.5 1.3
2.2 2.2 2.2
470 330 237
374 374 374
33 47 68
10 10 10
1 .2
2 .2
187
374
82
10
1.0
2.2
23.2
93.1
47
10
Channel
Formula
VOUT (V)
L5 (uH)
R11 (kΩ)
R12 (kΩ)
C15 (pF)
COUT (uF)
12
10
820
95 .3
1000
10 /16V
CH5
VOUT = (1+R11/R12) x 1.25
13 14 15 15.5
10 10 10 10
820 953 1000 820
8 6.6
93.1 90.9 71.5
100 0
100 0
1000
100 0
1 0/16 V
10/25V 10/25V 10/25V
16
10
88 7
75
10 00
10/2 5V
Cha nne l
Form ula
VOUT (V)
L6 (uH)
R13 (kΩ)
R14 (kΩ)
C17 (pF)
COUT (uF)
C H6
VOUT = (R 13/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
100 0
100 0
100 0
100 0
100 0
10 x 2pcs 10 x 2pcs 10 x 2pcs 10 x 2pcs 10 x 2pcs
DS9919-01 April 2011
www.richtek.com
5
Free Datasheet http://www.datashee
5 Page 
RT9919
Parameter
RTC Reset
RTC_PWR Reset Threshold
Symbol
Test Condition
Min Typ Max Units
1.57 1.6 1.63 V
Hysteresis
Standby Current
RTC_R Rising Delay Time
RTC_PWR = 3V
-- 16 -- mV
-- 2 4 uA
35 55 75 ms
RTC_R Sink Capability
RTC LDO, CN = High
RTC_R = 0.5V,
RTC_PWR = 1.6V
4 -- -- mA
Input Voltage Range
Standby Current
Output Voltage
Maximum Output Current
Dropout Voltage
VIN
VOUT
VDR OP
VIN = 4.2V
IOUT = 0mA
VIN = 4.2V
IOUT = 20mA
-- -- 5.5 V
-- 5 8 uA
-- 3.05 --
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 expose pad for the
package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
DS9919-01 April 2011
www.richtek.com
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet RT9919.PDF ] | |
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