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PDF RT9902 Data sheet ( Hoja de datos )
| Número de pieza | RT9902 | |
| Descripción | 4 Channel DC/DC Converters IC | |
| Fabricantes | Richtek Technology Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9902 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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Preliminary
RT9902
4 Channel DC/DC Converters IC with High-Efficiency Step-Up
and Step-Down
General Description
The RT9902 is a complete power supply solution for digital
still cameras and other hand-held devices. It integrates a
high-efficiency main step-up DC-DC converter, two high-
efficiency step-down converters, a charge pump, and a
linear controller that drives an external P-MOSFET for linear
www.DataSrheegetu4lUa.tcoorm. The RT9902 is targeted for applications that use
either two or three AA cells or a single lithiumion battery.
The main step-up DC-DC converter accepts inputs from
1.5V to 5.5V and build in 2.6A Internal switch. The two
step-down DC-DC converters (CH2, CH3) accept inputs
from 1.5V to 5.5V and regulate a resistor adjustable
output from 0.8V to 5.5V. Each DC-DC converter has
independent shutdown input.
The feature of the charge pump is to deliver few current
to micro-controller when the system operates in the
standby mode. RT9902 includes a linear controller with
0.8V reference voltage. An adjustable operating frequency
(up to 1.4MHz) is utilized to get optimum size, cost, and
efficiency.
RT9902 is available in VQFN-32L 5x5 package.
Ordering Information
RT9902
Package Type
QV : VQFN-32L 5x5 (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.
Features
z 1.5V to 5.5V Battery Input Voltage Range
z Main step-up DC-DC Converter
`1.5V to 5.5V Adjustable Output Voltage
`Up to 90% Efficiency
`2.6A, 0.3Ω Internal Power Switch
z Two Step-Down DC-DC Converters
`0.8V to 5.5V Adjustable Output Voltage
`94% Efficiency
`100% Duty Cycle
z Step-up Charge Pump for Micro-Controller
z Linear Controller for Linear Regulator
z Up to 1.4MHz Switching Frequency
z 1μA Supply Current in Shutdown Mode
z Programmable Soft Start Function
z Independent Enable Pin (CH1, CH2, CH3)
z External Compensation Network (CH1, CH2, CH3)
z Short Circuit Protection (CH1, CH2, CH3)
z Over Voltage Protection (CH2)
z 32-Lead VQFN Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Digital Still Cameras
z PDAs
z Portable Devices
Pin Configurations
(TOP VIEW)
COMP3
VDD3
LX3
PGND3
SS
RT
GND
LDO_O
32 31 30 29 28 27 26 25
1 24 VDD2
2 23 VDD2
3 22 LX2
4
GND
21 LX2
5 20 PGND2
6 19 LX1
7 33 18 LX1
8 17 VDD1
9 10 11 12 13 14 15 16
DS9902-10 August 2007
VQFN-32L 5x5
www.richtek.com
1
1 page  
Function Block Diagram
Preliminary
RT9902
VDDM ENM
www.DataSheet4U.com
VDDC
CX
CPFB
LDO_O
LFB
SS
RT
CH4
Charge Pump
Linear EN
Controller
Soft-Start
OSC
PWM
OSC
Thermal
Shutdown
EN
CH1
Current-MODE
Asynchronous
Step-Up
PWM
Boost
CH2
Current-MODE
Synchronous
Step-Down
PWM
Buck2
CH3
Current-MODE
Synchronous
Step-Down
PWM
Buck3
EN1
VDD1
LX1
PGND1
COMP1
FB1
EN2
VDD2
LX2
PGND2
COMP2
FB2
EN3
VDD3
LX3
PGND3
COMP3
FB3
GND
ENM
EN1
EN2
EN3
Charge
Pump
0 X X X Off
1 0 0 0 On
1 1 0 0 On
1 1 1 0 On
1 1 1 1 On
CH1 + Linear
Controller
Off
Off
On
On
On
CH2 CH3
Off Off
Off Off
Off Off
On Off
On On
DS9902-10 August 2007
www.richtek.com
5
5 Page 
Preliminary
RT9902
Boost LX & Output Ripple
VIN = 2.5V, VOUT = 3.3V, @IOUT = 400mA
Boost LX & Output Ripple
VIN = 3V, VOUT = 3.3V, @IOUT = 100mA
www.DataSheet4U.com
Time (1us/Div)
Boost LX & Output Ripple
VIN = 3V, VOUT = 3.3V, @IOUT = 400mA
Time (1us/Div)
Buck2 Efficiency vs. Output Current
100
VOUT = 1.8V
VIN = 2.5V
90
80
VIN = 4.5 VIN = 3.8V
VIN = 3V
70
60
50
1
10 100
Output Current (mA)
1000
DS9902-10 August 2007
Time (1us/Div)
Buck2 Efficiency vs. Output Current
100
VOUT = 1.5V
VIN = 2.2V
90
80
VIN = 4.5V
VIN = 2.5V
70 VIN = 3V
VIN = 3.8V
60
50
1
10 100
Output Current (mA)
1000
Buck2 Efficiency vs. Output Current
100
VOUT = 2.5V
90
80 VIN = 4.5
70
60
VIN = 3.8V
50
VIN = 3V
40
30
1
10 100
Output Current (mA)
1000
www.richtek.com
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet RT9902.PDF ] | |
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