Datasheet

MAX6643/MAX6644/MAX6645
Automatic PWM Fan-Speed Controllers with
Overtemperature Output
14 ______________________________________________________________________________________
PART
PACKAGE-PINS
STARTUP
DELAY (s)
SPIN-UP
TIME (s)
START DUTY
CYCLE (%)
MINIMUM DUTY
CYCLE (%)
CHANNELS
TL (°C)
TH (°C)
OT (°C)
FULLSPD
POLARITY
FAN_IN1 FAN_IN2
MAX6643
LBFAEE
QSOP-16 0.5 8 40 40
Remote,
local
15 to
55
20 to
60
60 to
100
FULLSPD Tach/off Tach/off
MAX6643
LBBAEE
QSOP-16 0.5 8 30 30
Remote,
local
15 to
55
20 to
60
60 to
100
FULLSPD Tach/off Tach/off
MAX6644
LBAAEE
QSOP-16 0.5 8 30 0
Remote,
remote
15 to
55
20 to
60
60 to
100
—
Locked
r otor /tach/
cur r ent
sense
Locked
r otor /tach/
cur r ent
sense
M AX 6645
ABFAU B
µMAX-10 0.5 8 40 40
Remote,
remote
45 50 75 —
Locked
r otor /tach/
cur r ent
sense
Locked
r otor /tach/
cur r ent
sense
Selector Guide
Pin Configurations
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
TH1
V
DD
TH2
OT1
OT2
PWM_OUT
FAN_IN1
FAN_IN2
OT
TOP VIEW
MAX6643
QSOP
TL2
TL1
FULLSPD
(FULLSPD)
FANFAIL
TACHSET
GND
DXP
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
TH1
V
DD
TH2
OT1
OT2
PWM_OUT
FAN_IN1
FAN_IN2
OT
MAX6644
QSOP
TL2
TL1
DXP2
FANFAIL
TACHSET
GND
DXP1
1
2
3
4
5
10
9
8
7
6
V
DD
PWM_OUT
FAN_IN1
FAN_IN2GND
DXP2
TACHSET
FANFAIL
MAX6645
μMAX
OTDXP1
() ARE FOR MAX6643_A ONLY.