3625 Datasheet, PDF (1/8 Pages) Allegro MicroSystems – POWERHALL SENSOR/DRIVERS FOR BRUSHLESS DC MOTORS

3625 AND
3626
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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°C to +85°C
Storage Temperature Range,
T_S . . . . . . . . . . . . . . . . -65°C to +150°C
V_CC(MAX)
I_O(CONT)
I_O(PEAK)
UDN3625M
14 V
1.0 A
1.6 A
UDN3626M
26 V
0.45 A
0.75 A
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°C.
POWERHALL® 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.
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
Always order by complete part number, e.g., UDN3625M .
See Maximum Ratings at left.