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PDF RT9903 Data sheet ( Hoja de datos )
| Número de pieza | RT9903 | |
| Descripción | 5 Channel DC/DC Converters IC | |
| Fabricantes | Richtek Technology Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9903 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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Preliminary
RT9903
5 Channel DC/DC Converters IC with High-Efficiency Step-Up
General Description
The RT9903 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.
The feature of the charge pump (CH5) is to deliver few
current to CCD negative voltage.
RT9903 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
RT9903
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.
DS9903-07 August 2007
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 Step-up Charge Pump (CH5) for CCD Negative
Voltage
`HV Internal Switches
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
CX 1
18 LX1
INCD 2
17 VDD
FB_CP
RT
EXT4
CS4
3
4
5
6
GND
16 PGND
15 EN4
14 EN2
25 13 EN1
7 8 9 10 11 12
VQFN-24L 4x4
www.richtek.com
1
1 page  
Preliminary
RT9903
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage (VDD) --------------------------------------------------------------------------------------------- −0.3 to 7V
z LX1, LX2, LX3 Pins, INCD Pin ----------------------------------------------------------------------------------------- −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
VVDD
VDD Pin Voltage
VDD Pin Voltage
2.4 -- 5.5 V
1.5 -- -- V
VDD Over Voltage Protection
VDD(OVP) VDD Pin Voltage
6 -- -- V
Supply Current
Shutdown Supply Current
CH1 DC/DC Converter Supply
Current
CH2 DC/DC Converter & Charge
Pump Supply Current
CH3 DC/DC Converter Supply
Current
CH4 DC/DC Converter Supply
Current
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
--
--
--
--
--
0.01
1
μA
200 250 μA
210 260 μA
250 300 μA
200 250 μA
To be continued
DS9903-07 August 2007
www.richtek.com
5
5 Page 
Preliminary
CH4 Load Transient Response
RT9903
VCX & Output Ripple
www.DataSheet4U.com
VBAT = 3V, VDD = 3.3V, @IOUT = 100mA to 350mA
Time (1ms/Div)
VCX & Output Ripple
VBAT = 2.5V, VDD = 3.3V
Time (2.5us/Div)
VCX & Output Ripple
VBAT = 3V, VDD = 3.3V
Time (2.5us/Div)
VCX & Output Ripple
VBAT = 4.2V, VDD = 3.3V
Time (2.5us/Div)
DS9903-07 August 2007
VBAT = 3.8V, VDD = 3.3V
Time (2.5us/Div)
2500
2000
1500
1000
500
0
0
Frequency vs. RRT Resistor
50 100 150 200 250 300
RRT (kΩ)
www.richtek.com
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet RT9903.PDF ] | |
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