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RT9902 データシート(PDF) 6 Page - Richtek Technology Corporation

部品番号 RT9902
部品情報  4 Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down
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メーカー  RICHTEK [Richtek Technology Corporation]
ホームページ  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9902 データシート(HTML) 6 Page - Richtek Technology Corporation

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RT9902
Preliminary
6
DS9902-10 August 2007
www.richtek.com
Pin No.
Pin Name
Pin Function
1
COMP3
CH3 Feedback Compensation Pin.
2
VDD3
CH3 Power Input Pin.
3
LX3
CH3 Switch Node. Drains of the internal P-Channel and N-MOSFET switches.
Connect an inductor to LX3 pins together as close as possible.
4
PGND3
Power Ground for CH3.
5
SS
Sets the soft start interval of the converter. Connect a capacitor from this pin to
ground.
6
RT
Frequency Setting Resistor Connection Pin. Frequency is 500kHz if RT pin not
connected.
7
GND
Analog Ground.
8
LDO_O
Linear Controller Driver Output.
9
VDDM
Device Input Power Pin.
10
LFB
Linear Controller Feedback Input.
11
FB1
CH1 Feedback Input Pin.
12
COMP1
CH1 Feedback Compensation Pin.
13
CPFB
Charge Pump Feedback Pin.
14
VDDC
Charge Pump Power Input Pin.
15
CX
Charge Pump External Driver Pin.
16
PGND1
Power Ground for CH1.
17
VDD1
CH1 Power Input Pin. Connect output of Boost to this pin.
18, 19
LX1
CH1 Switch Node. Connect an inductor to LX1 pins together as close as possible.
20
PGND2
Power Ground for CH2.
21, 22
LX2
CH2 Switch Node. Drains of the internal P-MOSFET and N-MOSFET switches.
Connect an inductor to LX2 pins together as close as possible.
23, 24
VDD2
CH2 Power Input Pin.
25
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.
26
EN1
CH1 Enable Input. Tie this pin higher than 1.3V to enable CH1. Tie below 0.4V to
turn off the CH1.
27
COMP2
CH2 Feedback Compensation Pin.
28
FB2
CH2 Feedback Input.
29
EN2
CH2 Enable Input. Tie this pin higher than 1.3V to enable CH2. Tie below 0.4V to
turn off the CH2.
30
EN3
CH3 Enable Input. Tie this pin higher than 1.3V to enable CH3. Tie below 0.4V to
turn off the CH3.
31
GND
Analog Ground.
32
FB3
CH3 Feedback Input.
Exposed Pad (33) GND
The exposed pad must be soldered to a large PCB and connected to GND for
maximum power dissipation.
Functional Pin Description


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