Am4964 – Diodes AM4964 User Manual
Page 3
AM4964
Document number: DS37241 Rev. 2 - 2
3 of 21
June 2014
© Diodes Incorporated
AM4964
A Product Line of
Diodes Incorporated
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Pin Descriptions
Pin Number
Pin Name
Function
1,20
NC
Not connected
2
PGND
Power ground
3
OUT2
Fan driver output2
4
VCC
Power supply
5
VMIN
Minimum speed setting pin
6
PWM
PWM pulse input terminal
7
CF
Filter capacitor
8
FG
FG signal output
9
RT
RT signal output
10
TL
Low temperature set resistor
11
IN+
Hall sensor input+
12
HB
Hall bias voltage
13
IN-
Hall sensor input-
14
RADJ
Output pulse duty/input pulse duty adjustable terminal
15
CT
Lock protect and auto start
16
SGND
Signal ground
17
TH
High temperature set resistor
18
TA
Output duty gap adjust pin between low and high temperature at 100% input duty
19
OUT1
Fan driver output1
Exposed pad
Central exposed pad
– The central exposed pad is for thermal dissipation. On PCB layout, the
exposed pad can be connected to GND or remain unconnected to any other signals