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CS3720
2A H-Bridge Driver
Description
The CS3720 is high current (2A typ)
bidirectional DC motor driver. The
H-bridge output stage consists of
two pairs of power NPN transis-
tors, each with a VSAT=2.3V at
IOUT=2A (typ).
The three TTL compatible inputs,
ENABLE1, ENABLE2, and DIREC-
TION control the output stage.
When ENABLE1 is low and
ENABLE2 is high, DIRECTION
determines which way current
flows through the motor coil. Any
other combination of ENABLE set-
tings disables the outputs.
The CS3720 is protected against
overvoltage fault conditions. If a
fault condition is detected, the IC
shuts down.
Absolute Maximum Ratings
DC Input Voltage ..................................................................................-0.3 to 28V
Transient Input Voltage ...................................................................... -0.3 to 74V
Internal Power Dissipation......................................................Internally limited
Junction Temperature Range .....................................................-40¡C to +150¡C
Storage Temperature Range.......................................................-65¡C to +150¡C
Lead Temperature Soldering
Wave Solder (through hole styles only) ............10 sec. max, 260¡C peak
Reflow (SMD styles only) .............60 sec. max above 183¡C, 230¡C peak
Electrostatic Discharge (Human Body Model).............................................2kV
Features
s High Current (2A typ)
Output
s TTL compatible
DIRECTION Control
s Fault Protection
Overvoltage
Load Dump Protection to
74V
Package Options
7 Lead Power SIP
Block Diagram
VSS
ENABLE1
ENABLE2
DIRECTION
VREF
Overvoltage
Protection
DRIVE
CONTROL
LOGIC
Transient
Protection
OUTPUT
DRIVER
+
Over
Current
Protection
Q1
OUTPUT
DRIVER
Ð
Q4
Q3
Over
Current
Protection
Q2
Rev. 5/4/99
Gnd
1
2 ENABLE1
4 DIRECTION
6 COIL+
8 Gnd
10 COILÐ
12 VSS
14 ENABLE2
COIL +
COIL -
7 Lead TO-220 7 Lead D2PAK
1
1 ENABLE1
2 DIRECTION
3 COIL+
1 4 Gnd
5 VSS
6 COILÐ
7 ENABLE2
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
A ¨ Company

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Electrical Characteristics: 5.5V ² VCC ² 17V; Ð40¡C ² TJ ² +150¡C; Ð40¡C ² TC ² +105¡C; Ð40¡C ² TA ² 105¡C; unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s Output Stage
Quiescent Current
Output Saturation Voltage
Output Leakage Current
Current Limit
IOUT=0mA;
ENABLE1=DIRECTION= High
ENABLE2=Low
IOUT=2A
IOUT=500mA
IOUT=0mA
10 mA
3.2 V
2.6 V
20 µA
3.0 A
s Logic Control Functions
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
Low Level Input Current
Turn on Delay
Guaranteed by design
Turn off Delay
Guaranteed by design
RLOAD=30½; Coil=5mH;
CLOAD=15pF
RLOAD=30½; Coil=5mH;
CLOAD=15pF
s Fault Protection Functions
Overvoltage Shutdown
IOUT = 500mA
2.0
-250
5
5
18.0
V
0.8 V
10 µA
µA
50 µs
50 µs
21.5 V
PACKAGE LEAD#
15 Lead
Power SIP
2
4
7 Lead
TO-220
1
2
7 Lead
D2PAK
1
2
63
84
12 5
10 6
14 7
3
4
5
6
7
Package Lead Description
LEAD SYMBOL
FUNCTION
ENABLE1
DIRECTION
COIL+
Gnd
VSS
COIL-
ENABLE2
Enables output when held low and ENABLE 2 = High
Determines the direction of current flow through COIL+ and
COIL- as long as ENABLE1 = Low and ENABLE2 = High
Positive Output of H bridge to coil
Ground connection
Supply voltage for IC
Negative Output of H bridge to coil
Enables output when held high and ENABLE 1 = Low
Application Hints
Motor Direction Control
Current flow through the two outputs COIL+ and COIL-
is controlled by the combined settings of ENABLE1,
ENABLE2 and DIRECTION (Table 1). The outputs will be
active only when ENABLE1 is low and ENABLE2 is high.
When DIRECTION is high, current flows out of COIL+
and into COIL-. When DIRECTION is low, current flows
out of COIL- and into COIL+. For any other combination
of ENABLE settings, the outputs are off.
ENABLE1 ENABLE2
Low
High
Low
High
High
X
X Low
DIRECTION
High
Low
X
X
COIL+
High
Low
OFF
OFF
Table 1. Logical Control Diagram
2
COIL-
Low
High
OFF
OFF

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Application and Test Diagram
VSS
VSS
I/O
mP
VSS
COIL +
CS3720
ENABLE1
ENABLE2
DIRECTION
Gnd
COIL -
D1 D1
D1 D1
LLOAD
5mH
RLOAD
30W
CLOAD
0.1mF
D1 = IN4001
or equivalent
Note: A heatsink is required for 2A operation.
Figure 1. Delay Times for ENABLE and COIL
ENABLE2 = 2.4V
5V
ENABLE1
0V
50%
5V
DIRECTION
0V
17V
COIL+
0V
10%
17V
COILÐ
0V
5V
ENABLE2
0V
ENABLE1 = 0.4V
50%
50ms
Turnoff
Delay
5V
DIRECTION
0V
17V
COIL+
0V
17V
COILÐ
0V
10%
50%
90%
50ms
Turnoff
Delay
50%
90%
3

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Package Specification
PACKAGE DIMENSIONS IN mm (INCHES)
7 Lead D2PAK (DPS)* Short-Leaded
1.68 (.066)
1.40 (.055)
10.31 (.406)
10.05 (.396)
1.40 (.055)
1.14 (.045)
8.53 (.336)
8.28 (.326)
14.71 (.579)
13.69 (.539)
2.79 (.110)
2.54 (.100)
0.91 (.036)
0.66 (.026)
TERMINAL 8 6.50 (.256) REF
1.27 (.050)
REF
.254 (.010)
REF
1.98 (.078)
1.47 (.058)
7.75 (.305)
REF
4.57 (.180)
4.31 (.170)
0.10 (.004)
0.00 (.000)
PACKAGE THERMAL DATA
Thermal Data
RQJC typ
7L 7L
D2PAK TO-220
2.1 2.1
7L
Power SIP
2.1 ûC/W
RQJA typ
10-50* 50
35 ûC/W
*Depending on thermal properties of substrate. RQJA=RQJC + RQCA.
7 Lead TO-220 (T) Straight
2.87 (.113)
2.62 (.103)
10.54 (.415)
9.78 (.385)
4.83 (.190)
4.06 (.160)
6.55 (.258)
5.94 (.234)
3.96 (.156)
3.71 (.146)
1.40 (.055)
1.14 (.045)
14.99 (.590)
14.22 (.560)
*CHERRY SEMICONDUCTOR SHORT-LEADED FOOTPRINT
7 Lead Power SIP (M) Straight
20.02 (.788)
17.50 (.689)
10.69 (.421)
14.22 (.560)
13.72 (.540)
0.94 (.037)
0.58 (.023)
1.40 (.055)
1.14 (.045)
7.75 (.305)
7.49 (.295)
0.64 (.025)
0.38 (.015)
0.56 (.022)
0.36 (.014)
2.92 (.115)
2.29 (.090)
1.1 (.043)
10.9 (.429)
0.79 (.031)
MAX.
2.54 (.100)
15.24 (.600)
Ordering Information
Part Number
CS3720XT7
CS3720XTVA7
CS3720XTHA7
CS3720XM7
CS3720XDPS7
CS3720XDPSR7
Description
7 Lead TO-220 Straight
7 Lead TO-220 Vertical
7 Lead TO-220 Horizontal
7 Lead Power SIP Straight
7 Lead D2PAK Short-Leaded
7 Lead D2PAK Short-Leaded
(tape & reel)
Rev. 5/4/99
Cherry Semiconductor Corporation reserves the
right to make changes to the specifications without
notice. Please contact Cherry Semiconductor
Corporation for the latest available information.
4 © 1999 Cherry Semiconductor Corporation