Ordering number : EN2575E

Monolithic Digital IC

LB1641 Bidirectional Motor Driver

Overview
The LB1641 is a bidirectional motor driver IC. Since it has a 2-input logic circuit and performs the functions of
bidirectional driving and braking, it is capable of direct driving 6V, 9V, 12V motors. The output voltage can be varied by
using an external zener diode.

Features
• 2-input logic can be used to exercise control of bidirectional driving and braking.
• On-chip elements to absorb dash current of motor.
• Input interfaceable to MOS LSI.
• Output voltage variable by use of external zener diode.

Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VCC max 18 V
Input voltage VIN -0.3 to VCC V
Output circuit IOUT ±1.6 A
Allowable power dissipation Pd max 1.2 W
Operating temperature Topr -25 to +75 °C
Storage temperature Tstg -55 to +125 °C

Recommended Operating Ranges at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Supply voltage VCC1 7 to 18 V
VCC2 5 to 18 V

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"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
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Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
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equipment.

D2408 MS/73098HA (KT)/N3093TS/6247KI, TS No.2575-1/5

 LB1641
Electrical Characteristics at Ta = 25°C, VCC = 12V
Ratings
Parameter Symbol Conditions Unit
min typ max
Input threshold voltage Vth RL = ∞ 1.1 1.3 1.5 V
Minimum input on-state current IIN RL = ∞ 10 15 µA
Output voltage VO RL = 60Ω, VZ = 7.4V 6.6 7.2 7.4 V
Output leakage current IOL Pins 5,6 GND, RL = ∞ 0.01 1.0 mA
Current drain ICC Pins 5,6 GND, RL = ∞ 3 6 10 mA
Saturation voltage (upper) Vsat1 IOUT = 300mA 1.9 2.2 V
Vsat1’ IOUT = 500mA 1.9 2.3 V
Saturation voltage (lower) Vsat2 IOUT = 300mA 0.25 0.5 V
Vsat2’ IOUT = 500mA 0.4 0.65 V

Package Dimensions
unit : mm (typ)
3043C Pd max -- Ta
1.4

Allowable power dissipation, Pd max -- W

24.0 3.25 1.2

1.0
7.7MAX
(6.5)

0.8

0.6
1.1

4.9

1 10 0.4
(0.62) 2.54 1.2 0.5 0.25 1.5
0.2

0
-25 0 25 50 75 100
SANYO : SIP10 Ambient temperature, Ta -- °C

Pin Assignment

LB1641

1 2 3 4 5 6 7 8 9 10 Top view
GND OUT1 P1 VZ IN1 IN2 VCC1 VCC2 P2 OUT2

Truth Table
Input Output
Operation
IN1 IN2 IN3 IN4
0 0 0 0 Braking
1 0 1 0 Forward (reverse) drive
0 1 0 1 Reverse (forward) drive
1 1 0 0 Braking
Input level 1 : 2.0V or greater
0 : 0.7V or less

No.2757-2/5
 LB1641
Block Diagram
P1 OUT1 VCC2 OUT2 P2 VCC1
3 2 8 10 9 7

Predriver
4 VZ

IN1 5 Input logic circuit 6 IN2

GND 1

Test Circuit
0.01µF

RL
SW
A VCC1,2=12V
3 2 7 10 9 8
4

LB1641
7.4V

5 6 VZ
1

V VIN

Sample Application Circuit : 6V motor circuit

LB1641

1 2 3 4 5 6 7 8 9 10
10Ω
6.8ZD

IN1 IN2 VCC=12V

0.01µF

0.1µF

No.2757-3/5
 LB1641
ICC -- VCC Vsat1 -- IO
8 4.0
VCC = 12V
7
3.2

Saturation voltage, Vsat1 -- V

6
Current drain, ICC -- mA

5
2.4

1.6
3

2
0.8
1

0 0
0 4 8 12 16 20 24 0 0.4 0.8 1.2 1.6 2.0
Supply voltage, VCC -- V Output current, IO --A
ICC -- Ta Vsat2 -- IO
8 1.6
VCC = 12V
7 1.4

Saturation voltage, Vsat2 -- V

6 1.2
Current drain, ICC -- mA

5 1.0

4 0.8

3 0.6

2 0.4

1 0.2

0 0
-40 0 40 80 120 160 0 0.4 0.8 1.2 1.6 2.0
Ambient temperature, Ta -- °C Output current, IO --A
VO -- VZ
18
VCC = 18V
16 IOUT = 0.3V

14
Output voltage, VO -- V

12

10

0
0 4 8 12 16 20
Zener voltage, VZ -- V

No.2757-4/5
 LB1641

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This catalog provides information as of December, 2008. Specifications and information herein are subject
to change without notice.

PS No.2575-5/5