RT8841 데이터 시트보기 (PDF) - Richtek Technology
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RT8841 Datasheet PDF : 33 Pages
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RT8841
Functional Pin Description
Pin No.
1
Pin Name
VIDSEL
Pin Function
VID DAC Selection Pin.
2
FBRTN
Negative remote sense pin of output voltage.
3
SS/EN
Connect this pin to GND by a capacitor to adjust soft start time.
Pull this pin to GND to disable controller.
4
ADJ
Connect this pin to GND by a resistor to set loadline.
5
COMP
Output of error-amp and input of PWM comparator.
6
FB
Inverting input of error-amp.
7
OFS
8
RT
Connect this pin to GND by a resistor to set no-load offset voltage.
Connect this pin to GND by a resistor to adjust frequency.
9
IMAX
Negative input of OCP comparator. (Positive input of OCP
comparator is ADJ).
10
11,14,15,18
GND
Ground Pin.
ISP4, ISP3, ISP2, ISP1 Positive current sense pin of channel 1, 2, 3 and 4.
12,13,16,17 ISN4, ISN3, ISN2, ISN1 Negative current sense pin of channel 1, 2, 3 and 4.
19
VCC5
5V LDO output for system power supply pin.
20,21
22,30
PWM4, PWM3
BOOT2, BOOT1
PWM output for channel 4 and channel 3.
Bootstrap supply for channel 2 and channel 1.
23,29
UGATE2, UGATE1
Upper gate driver for channel 2 and channel 1.
24,28
PHASE2, PHASE1
Switching node of channel 2 and channel 1.
25,27
LGATE2, LGATE1
Lower gate driver for channel 2 and channel 1.
26
VCC12
31
PWRGD
IC power supply. Connect to 12V.
Power good indicator.
32
EN/VTT
VTT voltage detector input.
33 to 40
VID7 to VID0
Voltage identification input for DAC.
41 (Exposed pad) GND
Exposed pad should be soldered to PCB board and connected to
GND.
VID Table Selection
VIDSEL VID [7] Table
VTT
X
VR11
GND
X
VR1 0.x
VCC5 VTT
K8
VCC5 GND K8_M2
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8841-02 August 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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