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L293B
L293E
July 2003
■OUTPUT CURRENT 1A PER CHANNEL
■PEAK OUTPUT CURRENT 2A PER CHANNEL
(non repetitive)
■INHIBIT FACILITY
■HIGH NOISE IMMUNITY
■SEPARATE LOGIC SUPPLY
■OVERTEMPE R ATURE PR O TECTION
DESCRIPTION
The L293B and L293E are quad push-pull drivers
capable of delivering output currents to 1A per
channel. Each channel is controlled by a TTL-
compatible logic input and each pair of drivers (a
full bridge) is equipped with an inhibit input which
turns off all fo ur transistors. A separat e su pply in-
put is provided for the logic so that it may be run
off a lower voltage to reduce dissipation.
Additionally, the L293E has external connection of
sensing resistors, for switchmode control.
The L293B and L29 3E a re pac kage in 16 and 20-
pin plastic DIPs respectively ; both use the four
center pins to conduct heat to the printed circuit
board.
DIP16 POWERDIP(16+2+2)
ORDERING NUMBERS:
L293B L293E
PUSH-PULL FOUR CHANNEL DRIVERS
PIN CONNECTION ( Top v iew)
DIP16 - L29 3B
P OWER DIP (1 6+2 +2) - L29 3E
L293E L293B
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BLOCK DIAGRAMS
DIP16 - L293B
POWER DIP (1 6+2 +2) - L293E
3/12
L293E L293B
SCHEMATIC DIAGRAM
(*) In the L293 these point s are n ot externally avai l able. They are i nte rnall y co nnec ted to the g round (substrate).
O Pins of L293 () Pins of L293E.
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
s
Supply Voltage 36 V
V
ss
Logic Supply Voltage 36 V
V
i
Input Voltage 7 V
V
inh
Inhibit Voltage 7 V
I
out
Peak Output Current (non repetitive t = 5ms) 2 A
P
tot
Total Power Dissipation at T
ground-pins
= 80°C 5 W
T
stg
, T
j
Storage and Junction Temperature –40 to +150 oC
L293E L293B
4/12
THE RMAL D A TA
ELECTRICAL CHARACTERISTCS
* See figure 1
** Referred to L293E
TRUTH TABLE
(*) High outpu t im pedance
(**) Rel ativ e to the consi derat e chan nel
Symbol Parameter Value Unit
R
th j-case
Thermal Resistance Junction-case Max. 14 oC/W
R
th j -amb
Thermal Resistance Junction-ambient Max. 80 oC/W
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
s
Supply Voltage Vss 36 V
Vss L ogic Supply Voltage 4.5 36 V
I
s
Total Quiescent Supply Current V
i
= L; I
o
= 0; V
inh
= H 2 6 mA
V
i
= h; I
o
= 0; V
inh
= H 16 24 mA
V
inh
= L 4 mA
I
ss
Total Quiescent Logic Supply
Current V
i
= L; I
o
= 0; V
inh
= H 44 60 mA
V
i
= h; I
o
= 0; V
inh
= H 16 22 mA
V
inh
= L 16 24 mA
V
iL
Input Low Voltage -0.3 1.5 V
ViH Input High Volta ge V
SS
≤ 7V 2.3 Vss V
V
SS
> 7V 2.3 7 V
I
iL
Low Voltage Input Current V
il
= 1.5V -10 µA
I
iH
High Voltage Input Current 2.3V ≤ V
IH
≤ V
SS
- 0.6V 30 100 µA
V
inhL
Inhibit Low Voltage -0.3 1.5 V
V
inhH
Inhibit High Voltage V
SS
≤7V 2.3 Vss V
V
SS
> 7V 2.3 7 V
I
inhL
Low Voltage Inhibit Current V
inhL
= 1.5V -30 -100 µA
I
inhH
High Voltage Inhibit Current 2.3V ≤V
inhH
≤ Vss- 0.6V ±10 µA
V
CEsatH
Source Output Saturation Voltage I
o
= -1A 1.4 1.8 V
V
CEsatL
Sink Output Saturation Voltage I
o
= 1A 1.2 1.8 V
V
SENS
Sensing Voltage (pins 4, 7, 14, 17)
(**)
2V
t
r
Rise Time 0.1 to 0.9 V
o
(*) 250 ns
t
f
Fall Time 0.9 to 0.1 V
o
(*) 250 ns
t
on
Tu r n-on Delay 0.5 V
i
to 0.5 V
o
(*) 750 ns
t
off
Tu r n-off Delay 0.5 V
i
to 0.5 V
o
(*) 200 ns
V
i
(each channel) V
o
V
inh (** )
HHH
LLH
H
X
(*)
L
LX
(*)
L
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L293E L293B
Figu re 1. Swi tc hi ng Timers
Figure 2. Saturation voltage versus Output
Current
Figure 3. Source Saturati on Volt age versus
Ambient Temperature
Figure 4. Sink Saturation V oltage vers us
Ambient Tem peratu re
Figure 5. Quiescent Logic Supply Current
versus Logic Supply Voltage
L293E L293B
6/12
Figure 6. Output V olt age vers us Inpu t Voltage
Figure 7. Output Voltage versus Inhibit Voltage
APPLICATION INFORMATION
Figu re 8 . DC Motor C on t rol s
(with connection to ground and to the
supply voltage)
L = Low H = Hi gh X = Don’t C are
Figure 9 . Bidirectional DC Motor Control
L = Low H = Hi gh X = Don’t C are
V
inh
AM1B M2
HH
Fast Motor Stop
HRun
H L Run L Fast Motor Stop
L X Free Running X Free Running
Motor Stop Motor Stop
Inputs Function
V
inh
= H C = H ; D = L Turn Right
C = L ; D = H Turn Left
C = D Fast Motor Stop
V
inh
= L C = X ; D = X Free Running Motor Stop
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L293E L293B
Figu re 10 . Bi pol ar Steppin g Mo t or C on t rol
L293E L293B
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Figure 11. Stepp ing Motor Driver wi th Phase Cu rren t Control and Short Circuit Protec tion
9/12
L293E L293B
MOUNTING INST RUCTIONS
The R
th j-amb
of the L293B and the L293E can be reduced by soldering the GND pins to a suitable copper
area of the printed circuit board as shown in figure 12 or to an external heatsink (figure 13).
During soldering the pins temperature mus t not exceed 260°C and the soldering time must not be longer
than 12 seconds.
The external heatsink or printed circuit copper area must be connect ed to electrical ground.
Figure 12. Examp le of P.C. Board Copper Area wh ich is Used as Heatsink
Figure 13. Extern al Heatsink Mou nting Exam p le (R
th
= 30°C/W)
L293E L293B
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DIP16
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
a1 0.51 0.020
B 0.77 1.65 0.030 0.065
b 0.5 0.020
b1 0.25 0.010
D 20 0.787
E 8.5 0.335
e 2.54 0.100
e3 17.78 0.700
F 7.1 0.280
I 5.1 0.201
L 3.3 0.130
Z 1.27 0.050
OUTLINE AND
MECHANICAL DATA
11/12
L293E L293B
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
a1 0.51 0.020
B 0.85 1.40 0.033 0.055
b 0.50 0.020
b1 0.38 0.50 0.015 0.020
D 24.80 0.976
E 8.80 0.346
e 2.54 0.100
e3 22.86 0.900
F 7.10 0.280
I 5.10 0.201
L 3.30 0.130
Z 1.27 0.050
Powerdip 20
OUTLINE AND
MECHANICAL DAT A
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L293E L293B
