A3908EEETR-T Allegro Microsystems Inc, A3908EEETR-T Datasheet

IC MOTOR DRIVER DC LV 500MA 8DFN

A3908EEETR-T

Manufacturer Part Number
A3908EEETR-T
Description
IC MOTOR DRIVER DC LV 500MA 8DFN
Manufacturer
Allegro Microsystems Inc
Datasheet

Specifications of A3908EEETR-T

Applications
DC Motor Driver
Number Of Outputs
1
Current - Output
500mA
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-UFDFN
Motor Type
DC
No. Of Outputs
1
Output Current
500mA
Output Voltage
4.8V
Supply Voltage Range
3V To 5.5V
Driver Case Style
DFN
No. Of Pins
8
Operating Temperature Range
-40°C To +85°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Load
-
Lead Free Status / Rohs Status
Compliant
Other names
620-1282-2

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
A3908EEETR-T
Manufacturer:
ALLEGRO/PBF
Quantity:
2 080
Part Number:
A3908EEETR-T
Manufacturer:
ALLEGRO/雅丽高
Quantity:
20 000
Features and Benefits
▪ Constant voltage operation (adjustable)
▪ 500 mA output peak rating
▪ Low power standby mode
▪ Small 2 mm × 2 mm, 0.55 mm nominal height DFN
▪ Typical input voltage range of 3 to 5.5 V
▪ Adjustable constant voltage or PWM operation
▪ Less than 500 nA standby mode current
▪ –40 to 85 operating temperature range
Package: 8 Contact DFN (suffix EE)
3908-DS
package
Approximate Scale 1:1
CPU
+V
BAT
R1
18 kΩ
R2
10 kΩ
Typical Application
IN1
IN2
VREF
VSET
A3908
GND
Description
The A3908 is a low voltage bidirectional DC motor driver with
a typical input voltage range of 3 to 5.5 V and output currents up
to 500 mA. The unique output full-bridge incorporates source-
side linear operation to allow a constant voltage across the motor
coil. This regulated output minimizes motor voltage change due
to I × R
Logic input pins are provided to control the motor direction of
rotation, brake, and standby (< 500 nA supply current) modes and
to allow optional PWM of the sink drivers. Internal protection
circuitry includes thermal shutdown, undervoltage lockout, and
crossover current (shoot-through) protection.
The A3908 is supplied in a 2 mm x 2 mm, 0.55 mm nominal
height, 8-lead DFN package, with exposed thermal pad (package
suffix EE). This small footprint package is lead (Pb) free, with
100% matte tin leadframe plating.
Applications include:
▪ Robotic actuators and pumps
▪ Portable printers/scanners
▪ Camera lens/shutter control
▪ Battery powered toys and games
▪ Low noise test instrumentation systems
VDD
Low Voltage DC Motor Driver
OUTA
OUTB
DS(on)
variation and battery voltage tolerance.
M
A3908

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A3908EEETR-T Summary of contents

Page 1

Features and Benefits ▪ Constant voltage operation (adjustable) ▪ 500 mA output peak rating ▪ Low power standby mode ▪ Small 2 mm × 2 mm, 0.55 mm nominal height DFN package ▪ Typical input voltage range ...

Page 2

... A3908 Part Number A3908EEETR-T Parameter Supply Voltage Logic Input Voltage Range Output Current Junction Temperature Storage Temperature Range Operating Temperature Range Low Voltage DC Motor Driver Selection Guide Packing Tape and reel, 3000 pieces/reel Absolute Maximum Ratings Symbol Conditions OUT stg T Range E A Min ...

Page 3

A3908 VREF R1 VSET R2 IN1 IN2 Number Low Voltage DC Motor Driver Functional Block Diagram VBG CHARGE PUMP 3R OUTA OUTB R Sink Drive Control Logic Terminal Diagram OUTB 1 8 ...

Page 4

A3908 ELECTRICAL CHARACTERISTICS at T Characteristics Supply Current UVLO Enable Threshold UVLO Hysteresis Thermal Shutdown Temperature Thermal Shutdown Hysteresis Logic Input Low Level Logic Input High Level Input Hysteresis Logic Input Current Output Driver Sink Driver Output Resistance Source Driver ...

Page 5

A3908 The A3908 regulates the voltage Voltage Regulation across the motor coil. The voltage across the OUTA and OUTB terminal is sensed and compared to an internal threshold voltage. The high-side switch will be driven in linear mode to keep ...

Page 6

A3908 Layout The printed circuit board should use a heavy ground- plane for optimum thermal performance. The A3908 must be soldered directly onto the board. On the underside of the A3908 package is an exposed pad, which provides a path ...

Page 7

A3908 during PWM operation and ensure that the supply voltage remains stable at the input terminal. Bulk capacitance is often located at a non-ideal distance from the device. If the recommended capacitance of 10 μF cannot be located very close ...

Page 8

A3908 D 9X 0.08 C 0.25 ±0.05 0.325 ±0.050 Copyright ©2008, Allegro MicroSystems, Inc. The products described here are manufactured under one or more U.S. patents or U.S. patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time ...

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