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PDF RT9907 Data sheet ( Hoja de datos )
| Número de pieza | RT9907 | |
| Descripción | 3 Channel DC/DC Converters IC | |
| Fabricantes | Richtek Technology Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9907 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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Preliminary
RT9907
3 Channel DC/DC Converters IC with High-Efficiency Step-Up
and Step-Down
General Description
The RT9907 is a three channel power-supply solution for
digital still cameras and other battery-powered devices. It
integrates an asynchronous step-up and two synchronous
step-down DC-DC converters. The RT9907 is targeted for
applications that use two AA cells or a single lithium-ion
www.DataSbheaettt4eUry.c.om
The three DC-DC converters (CH1, CH2, CH3) accept input
voltage from 1.5V to 5.5V. Each DC-DC converter has
better transient response and excellent stability by
providing current-mode control and external compensation
network. With built-in Internal MOSFET and up to 1.4MHz
operating frequency, the RT9907 allows minimum BOM
cost and PCB area.
The step-down DC-DC converters (CH2, CH3) can regulate
output voltage as low as 0.8V. Three operational modes
are available: PWM, PSM, Low-Dropout modes. At PWM
mode, Internal synchronous rectifier with low RDS(ON)
dramatically reduces conduction loss and achieve 94%
efficiency. It enters Low-Dropout mode when normal PWM
cannot provide regulated output voltage by continuously
turning on the upper P-MOSFET. No external Schottky
diode is required in practical application.
Each DC-DC converter has independent enable input and
soft-start function allowing versatile power sequence
combination. Complete protection functions are
implemented such as short circuit, over-voltage protection.
The RT9907 is available in small VQFN-24L 4x4 package.
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 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 24-Lead VQFN Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Digital Still Camera
z PDAs
z Portable Device
Pin Configurations
(TOP VIEW)
Ordering Information
RT9907
Package Type
QV : VQFN-24L 4x4 (V-Type)
Note :
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
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.
DS9907-07 August 2007
24 23 22 21 20 19
COMP3 1
18 EN1
VDD3 2
17 ENM
LX3 3
PGND3 4
GND
16 VDD2
15 LX2
SS 5
RT 6
14 PGND2
25 13 LX1
7 8 9 10 11 12
VQFN-24L 4x4
www.richtek.com
1
1 page  
Preliminary
RT9907
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 COMP3 CH3 Feedback Compensation Pin.
2
3
4
5
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6
7, 23
8
VDD3
LX3
PGND3
SS
RT
GND
VDDM
CH3 Power Input Pin.
CH3 Switch Node. Drains of the internal P-MOSFET and N-MOSFET switches.
Connect an inductor to LX3 pins together as close as possible.
Power Ground for CH3.
Sets the Soft Start interval of the converter. Connect a capacitor from this pin to
ground.
Frequency setting resistor connection pin. Frequency is 500kHz if RT pin not
connected
Analog Ground.
Device Input Power Pin.
9 FB1 CH1 Feedback Input Pin.
10 COMP1 CH1 Feedback Compensation Pin.
11 PGND1 Power Ground for CH1
12 VDD1 CH1 Power Input Pin. Connect output of Boost to this pin.
13 LX1 CH1 Switch Vode. Connect an inductor to LX1 Pins together as close as possible.
14 PGND2 Power Ground for CH2.
15
LX2
CH2 Switch Node. Drains of the internal P-Channel and N-MOSFET switches.
Connect an inductor to LX2 pins together as close as possible.
16 VDD2 CH2 Power Input Pin.
17
ENM
Whole Device Control Pin. Tie this pin higher than 1.3V to enable the device. Tie
below 0.4V to turn off the device.
18
EN1
CH1 Enable Input. Tie this pin higher than 1.3V to enable CH1. Tie below 0.4V to
turn off the CH1.
19 COMP2 CH2 Feedback Compensation Pin.
20 FB2
21 EN2
22 EN3
24 FB3
Exposed Pad (25) GND
CH2 Feedback Input.
CH2 Enable Input. Tie this pin higher than 1.3V to enable CH2. Tie below 0.4V to
turn off the CH2.
CH3 Enable Input. Tie this pin higher than 1.3V to enable CH3. Tie below 0.4V to
turn off the CH3.
CH3 Feedback Input.
The exposed pad must be soldered to a large PCB and connected to GND for
maximum power dissipation.
DS9907-07 August 2007
www.richtek.com
5
5 Page 
Preliminary
RT9907
1.82
1.818
Buck2 Output Voltage vs. VDD2 Voltage
VBAT = VDDM = 3.3V, IOUT = 250mA
1.816
1.814
1.812
1.81
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1.808
1.806
1.804
2
2.5 3 3.5 4
VDD2 Voltage (V)
4.5
Buck2 Load Transient Response
@IOUT = 100mA to 400mA
Buck2 Output Voltage vs. VDDM Voltage
1.82
VDD2 = 3.3V, IOUT = 250mA
1.818
1.816
1.814
1.812
1.81
1.808
1.806
1.804
2 2.5 3 3.5 4 4.5 5 5.5 6
VDDM Voltage (V)
Buck2 Load Transient Response
@IOUT = 100mA to 400mA
VDD2 = 2.5V, VDDM = 3.3V, VOUT = 1.8V
Time (1ms/Div)
Buck2 Load Transient Response
@IOUT = 100mA to 400mA
VDD2 = 3V, VDDM = 3.3V, VOUT = 1.8V
Time (1ms/Div)
Buck2 Load Transient Response
@IOUT = 100mA to 400mA
VDD2 = 3.8V, VDDM = 3.3V, VOUT = 1.8V
Time (1ms/Div)
DS9907-07 August 2007
VDD2 = 4.5V, VDDM = 3.3V, VOUT = 1.8V
Time (1ms/Div)
www.richtek.com
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet RT9907.PDF ] | |
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