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PDF RT9903B Data sheet ( Hoja de datos )
| Número de pieza | RT9903B | |
| Descripción | 4 Channel DC/DC Converters IC | |
| Fabricantes | Richtek Technology Corporation | |
| Logotipo |  |
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Preliminary
RT9903B
4 Channel DC/DC Converters IC with High-Efficiency Step-Up
General Description
The RT9903B is a complete power-supply solution for
digital still cameras and other hand-held devices. It
integrates a high-efficiency fours step-up DC-DC
converters and a charge pump.
The two Step-up DC-DC converters (CH1,CH2) accept
www.DataSihnepetu4tUs.cofrmom 1.5V to 5.5V and regulate a resistor-
adjustable output up to 17V. One Step-up DC-DC
converter (CH3) can be regarded as white LED Driver,
which reference voltage is 0.2V and have OVP function.
One step-up DC-DC converter (CH4) regulate a resistor-
adjustable output up 5V. An adjustable operating
frequency (up to 1.4MHz) is utilized to get optimum size,
cost, and efficiency.
RT9903B is available in VQFN-24L 4x4 package. Each
DC-DC converters have independent shutdown inputs.
Applications
z Digital Still Camera
z PDAs
z Portable Device
Ordering Information
RT9903B
Package Type
QV : VQFN-24L 4x4 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Pb-free and 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.
`100% matte tin (Sn) plating.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
Features
z Two step-up DC-DC Converters (CH1, CH2)
`HV Internal Switches
`50mA Load Current
z One Step-up DC-DC Converter (CH3)
`0.2V Reference Voltage
`HV Internal Switches
`LED Brightness Dimming Control
`Over Voltage Protection
z One Step-up DC-DC Converter (CH4)
`External Switches
`External Current Limit Setting
z Up to 1.4MHz Switching Frequency
z 1μA Supply Current in Shutdown Mode
z External Compensation Network for All Converters
z Programmable Soft Start Function (CH1, CH2, CH3,
CH4)
z Independent Enable Pin to Shutdown Each
Channel
z 24-Lead VQFN Package
z RoHS Compliant and 100% Lead (Pb)-Free
Pin Configurations
(TOP VIEW)
24 23 22 21 20 19
NC 1
18 LX1
PGND 2
17 VDD
PGND 3
RT 4
GND
16 PGND
15 EN4
EXT4 5
CS4 6
14 EN2
25 13 EN1
7 8 9 10 11 12
VQFN-24L 4x4
DS9903B-07 August 2007
www.richtek.com
1
1 page  
Preliminary
RT9903B
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage (VDD) --------------------------------------------------------------------------------------------- −0.3 to 7V
z LX1, LX2, LX3 Pins ------------------------------------------------------------------------------------------------------- −0.3V to 20V
z Other I/O Pin Voltage ---------------------------------------------------------------------------------------------------- −0.3V to 7V
z Power Dissipation, PD @ TA = 25°C
VQFN-24L 4x4 ------------------------------------------------------------------------------------------------------------ 1.923W
z Package Thermal Resistance (Note 3)
VQFN-24L 4x4, θJA ------------------------------------------------------------------------------------------------------- 52°C/W
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------ 260°C
www.DataShzeOet4pUe.rcaotmion Temperature Range ----------------------------------------------------------------------------------------- −40°C to 85°C
z Junction Temperature Range ------------------------------------------------------------------------------------------- 0°C to 125°C
z Storage Temperature Range ------------------------------------------------------------------------------------------- −65°C to 150°C
Recommended Operating Conditions (Note 2)
z Maximum Output Voltage Setting ( VOUT1 and VOUT2 ) ---------------------------------------------------------- 17V
z Dimming Control Frequency Range, CH3 -------------------------------------------------------------------------- 200Hz to 900Hz
Electrical Characteristics
(VDD =3.3V, TA = 25°C, unless otherwise specification)
Parameter
Symbol
Test Condition
Min Typ Max Units
Supply Voltage
VDD Operating Voltage
VDD Start-up Voltage
VDD Over Voltage Protection
Supply Current
Shutdown Supply Current
CH1 DC/DC Converter Supply
Current
CH2 DC/DC Converter Supply
Current
CH3 DC/DC Converter Supply
Current
CH4 DC/DC Converter Supply
Current
VVDD
VDD Pin Voltage
VDD Pin Voltage
VDD(OVP) VDD Pin Voltage
IOFF
IVDD1
IVDD2
IVDD3
IVDD4
VDD = 3.6V, VEN1 to 4 = 0V
VVDD =3.6V,
VFB1 = VREF + 0.15V
VEN1 = 3.3V, VEN2 = 0V,
VEN3 = 0V, VEN4 = 0V
VVDD = 3.6V,
VFB2 = VREF + 0.15V
VEN1 = 0V, VEN2 = 3.3V,
VEN3 = 0V, VEN4 = 0V
VVDD = 3.6V,
VFB3 = VREF + 0.15V
VEN1 = 0V, VEN2 = 0V,
VEN3 = 3.3V, VEN4 = 0V
VVDD = 3.6V,
VFB4 = VREF + 0.15V
VEN1 = 0V, VEN2 = 0V,
VEN3 = 0V, VEN4 = 3.3V
2.4
1.5
6
--
--
--
--
--
-- 5.5
-- --
-- --
0.01
1
200 250
210 260
250 300
200 250
V
V
V
μA
μA
μA
μA
μA
To be continued
DS9903B-07 August 2007
www.richtek.com
5
5 Page 
Preliminary
RT9903B
CH4 Load Transient Response
www.DataSheet4U.com
VBAT = 3V, VDD = 3.3V, @IOUT = 100mA to 350mA
Time (1ms/Div)
2500
2000
1500
1000
500
0
0
Frequency vs. RRT Resistor
50 100 150 200 250 300
RRT (kΩ)
DS9903B-07 August 2007
www.richtek.com
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet RT9903B.PDF ] | |
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