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RT8800 Datasheet(PDF) 2 Page - Richtek Technology Corporation

Part No. RT8800
Description  General Purpose 2/3-Phase PWM Controller for High-Density Power Supply
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Maker  RICHTEK [Richtek Technology Corporation]
Homepage  http://www.richtek.com
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RT8800 Datasheet(HTML) 2 Page - Richtek Technology Corporation

 
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RT8800/B
2
DS8800/B-06 March 2007
www.richtek.com
All brand name or trademark belong to their owner respectively
Pin Configurations
(TOP VIEW)
VQFN-16L 3x3
RT8800
SOP-16
RT8800B
Functional Pin Description
DACFB
Negative input of internal buffer amplifier for reference
voltage regulation. The pin voltage is locked at internal
VREF = 0.8V by properly close the buffer amplifier feedback
loop.
DACQ
The pin is defined as the output of internal buffer amplifier
for reference voltage regulation.
FB
The pin is defined as the inverting input of internal error
amplifier.
DVD
The pin is defined as a programmable power UVLO
detection input. Trip threshold = 0.8V at VDVD rising.
COMP
The pin is defined as the output of the error amplifier and
the input of all PWM comparators.
PI
The pin is defined as the positive input of the error amplifier.
RT
Switching frequency setting. Connect this pin to GND with
a resistor to set the frequency.
ICOMMON
Common negative input of current sense amplifiers for all
three channels.
PGOOD
Output power-good indication. The signal is implemented
as an output signal with open-drain type.
ISP1 , ISP2 , ISP3
Current sense positive inputs for individual converter
channel current sense.
PWM1 , PWM2 , PWM3
PWM outputs for each phase switching drive.
VDD
Chip power supply. Connect this pin to a 5V supply.
GND
Chip power ground.
Exposed Pad (RT8800)
Exposed pad should be soldered to PCB board and
connected to GND.
DACFB
ISP1
PGOOD
ISP3
ISP2
DVD
FB
DACQ
12
11
10
9
13
14
15
16
1
2
3
4
8
7
6
5
GND
VDD
DACFB
DACQ
FB
DVD
COMP
PI
RT
ICOMMON
GND
PGOOD
ISP
2
ISP
1
N/C
PWM1
PWM2
2
9
8
7
6
5
4
3
10
16
15
14
13
12
11


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