3625
AND
3626
P
OWER
H
ALL廬
SENSOR/DRIVERS
FOR BRUSHLESS DC MOTORS
Requiring a minimum of external components, the UDN3625M
and UDN3626M are monolithic ICs that provide single-chip control
and direct drive solutions for many small, single-phase, unipolar
brushless dc motor applications. Integrated into the ICs are a high-
sensitivity Hall-effect sensor, control and commutating logic, a stable
voltage regulator, extensive self and system protective functions, and
two high-current saturated npn outputs. Both ICs include thermal
shutdown, output over-current limiting, and output transient protection/
flyback diodes. The UDN3625M is nominally for 12 V motor applica-
tions while the UDN3626M is better suited to 24 V motors.
Output over-current limiting (relating to startup surge or a locked
rotor condition) and short-circuit protection are provided by an internal
current-sense resistor. The maximum (default) output load current is
typically 1.3 A for the UDN3625M or 600 mA for the UDN3626M,
but may be decreased by user selection of an external low-wattage
resistor.
A separate low-level output provides tachometer capability for
motor speed control or sensing a locked rotor condition. With appro-
priate external logic, pulse-width modulated (PWM) speed control can
be accomplished at the output current adjust pin.
These sensor/drivers are supplied in an 8-pin mini-DlP plastic
package with a copper leadframe for increased package power
handling capability.
Data Sheet
27690A
CONTACT FACTORY
for availability
and latest information
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
. . . . . . . . . .
See Table
Output Current, I
O
. . . . . . . . . . . .
See Table
PWM Current Control Voltage,
V
ADJ
. . . . . . . . . . . . .
See Applications
Magnetic Flux Density, B . . . . . .
Unlimited
Package Power Dissipation,
P
D
. . . . . . . . . . . . . . . . . . . .
See Graph
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . . . .
-20
擄
C to +85
擄
C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . . .
-65
擄
C to +150
擄
C
UDN3625M
V
CC(MAX)
I
O(CONT)
I
O(PEAK)
14 V
1.0 A
1.6 A
UDN3626M
26 V
0.45 A
0.75 A
FEATURES
s
900 mA /12 V or 400 mA /24 V Operation
s
Speed-Control (PWM) Capability
s
Locked-Rotor Indication
s
Minimum External Components
s
Over-Current Protected
s
Thermal Protection
s
Enhanced Reliability
s
Reduced Cost
Output current rating will be limited by
ambient temperature, supply voltage, and
duty cycle. Under any set of conditions, do
not exceed a junction temperature of
+150擄C.
Always order by complete part number, e.g.,
UDN3625M
.
See Maximum Ratings at left.
ALLEGRO
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