Allegro UDN3626M, UDN3625M Datasheet

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ABSOLUTE MAXIMUM RATINGS

3625

AND

3626

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 high­sensitivity 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 applica­tions 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 appro­priate external logic, pulse-width modulated (PWM) speed control can
be accomplished at the output current adjust pin.

Data Sheet

27690A

Supply Voltage, VCC. . . . . . . . . . See Table

Output Current, I
PWM Current Control Voltage,

V

. . . . . . . . . . . . . See Applications

ADJ

Magnetic Flux Density, B . . . . . . Unlimited

Package Power Dissipation,

. . . . . . . . . . . . . . . . . . . . See Graph

P

D

Operating Temperature Range,

. . . . . . . . . . . . . . . . . -20°C to +85°C

T

A

Storage Temperature Range,

TS. . . . . . . . . . . . . . . . -65°C to +150°C

V

CC(MAX)

I

O(CONT)

I

O(PEAK)

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.

. . . . . . . . . . . . See Table

O

UDN3625M UDN3626M

14 V 26 V

1.0 A 0.45 A

1.6 A 0.75 A

These sensor/drivers are supplied in an 8-pin mini-DlP plastic
package with a copper leadframe for increased package power
handling capability.

FEATURES

■ 900 mA/12 V or 400 mA/24 V Operation

■ Speed-Control (PWM) Capability

■ Locked-Rotor Indication

■ Minimum External Components

■ Over-Current Protected

■ Thermal Protection

■ Enhanced Reliability

■ Reduced Cost

Always order by complete part number, e.g., UDN3625M .
See Maximum Ratings at left.

3625

POWERHALL

AND

3626

®

SENSOR/DRIVERS FOR
BRUSHLESS DC MOTORS

REG.

X

7

GROUND

TSD

FUNCTIONAL BLOCK DIAGRAM

SUPPLY

5

OUT

4

6

OUT

A

8

TACH

OUT

V

S

B

+V

2.0

R = 55°C/W

θJC

1.5

1.0

0.5

0

25

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS

FREE AIR, R = 80°C/W

50 75 100 125 150

θJA

TEMPERATURE IN °C

Dwg. GP-009-1B

PWM/I
ADJUST

1

O

R

ADJ

TRUTH TABLE

Mag. Field PWM/IOADJ OUTAOUT

> +B

OP

> -B

OP

Any <0.3 V High High

Open Low High
Open High Low

Dwg. FP-005-1

B

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1988, 1995, Allegro MicroSystems, Inc.

3625

AND

3626

POWERHALL

®

SENSOR/DRIVERS FOR

BRUSHLESS DC MOTORS

ELECTRICAL CHARACTERISTICS at T

= +25°C, R

A

= ∞, Over Operating Voltage Range

ADJ

(unless otherwise noted).

Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
UDN3625M

Operating Voltage Range V
Output Leakage Current I
Output Breakdown Voltage V
Output Saturation Voltage V

S

O

(BR)CEX

O(SAT)

Output Current Limit IO MAX R
Output Clamp Voltage

V

CL

(Test Fig. 1)

Output Switching Time t
Supply Current

PLH

l

CC

(Test Fig. 2)

UDN3626M

VCC = VO = 24 V — — 100 µA
VCC = 24 V, lO = 10 mA* 34 — — V
IO = 450 mA, VS = 6.5 V — 0.25 0.4 V
IO = 900 mA, VS = 12 V — 0.5 0.8 V

= ∞, VO = 2 V 1.0 1.3 1.6 A

ADJ

ICL = 10 mA, VCC = 0 11 12 13 V
ICL = 450 mA=, VCC = 0 13 14 15 V
50% V
R

ADJ

R

ADJ

to VO = 3.0 V, lO = 450 mA — — 5.0 µs

ADJ

= ∞, VS = 14 V, One Output ON — 30 38 mA
= 0 Ω, VS = 14 V, Outputs OFF — 8.0 10 mA

6.5 12 14 V

Operating Voltage Range V
Output Leakage Current l
Output Breakdown Voltage V
Output Saturation Voltage V

S

O

(BR)CEX

O(SAT)

VCC = VO = 30 V — — 100 µA
VCC = 30 V, lO = 10 mA* 50 — — V
lO = 250 mA, VS = 6.5 V — 0.15 0.3 V

lO = 400 mA, VS = 24 V — 0.3 0.5 V
Output Current Limit lOMAX R
Output Clamp Voltage

V

CL

(Test Fig. 1)

Output Switching Time t
Supply Current l

PLH

CC

(Test Fig. 2)

= ∞, VO = 2 V 450 600 750 mA

ADJ

ICL = 10 mA, VCC = 0 17 18 20 V

ICL = 250 mA, VCC = 0 19 20 22 V

50% V

R

ADJ

R

ADJ

to VO = 3.0 V, lO = 250 mA — — 5.0 µs

ADJ

= ∞, VS = 26 V, One Output ON — — 24 mA
= 0 Ω, VS = 26 V, Outputs OFF — 8.0 10 mA

*lO is almost entirely Zener clamp current.
† Pulse test.
‡ Dependent on value of external series Zener diode (see Applications), 6.5 V without a Zener diode.

‡2426 V

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