SLUS171A - MARCH 1997 - REVISED AUGUST 2001
BLOCK DIAGRAM
3.0A Peak Current Totem Pole
Output
5 to 35V Operation
25ns Rise and Fall Times
25ns Propagation Delays
Thermal Shutdown and Under-
Voltage Protection
High-Speed, Power MOSFET
Compatible
Efficient High Frequency Operation
Low Cross-Conduction Current
Spike
Enable and Shutdown Functions
Wide Input Voltage Range
ESD Protection to 2kV
The UC1708 family of power drivers is made with a high-speed,
high-voltage, Schottky process to interface control functions and high-power
switching devices particularly power MOSFETs. Operating over a 5 to 35
volt supply range, these devices contain two independent channels. The A
and B inputs are compatible with TTL and CMOS logic families, but can
withstand input voltages as high as V
IN
. Each output can source or sink up
to 3A as long as power dissipation limits are not exceeded.
Although each output can be activated independently with its own inputs,
they can be forced low in common through the action of either a digital high
signal at the Shutdown terminal or by forcing the Enable terminal low. The
Shutdown terminal will only force the outputs low, it will not effect the behav-
ior of the rest of the device. The Enable terminal effectively places the device
in under-voltage lockout, reducing power consumption by as much as 90%.
During under-voltage and disable (Enable terminal forced low) conditions,
the outputs are held in a self-biasing, low-voltage, state.
The UC3708 and UC2708 are available in plastic 8-pin MINI DIP and 16-pin
"bat-wing" DIP packages for commercial operation over a 0
o
C to +70
o
C tem-
perature range and industrial temperature range of -25
o
C to +85
o
C
respectively. For operation over a -55
o
C to +125
o
C temperature range, the
UC1708 is available in hermetically sealed 8-pin MINI CDIP, 16 pin CDIP
and 20 pin CLCC packages. Surface mount devices are also available.
UC1708
UC2708
UC3708
Dual Non-Inverting Power Driver
Note: Shutdown feature is not available in J or N packages only.
UDG-92024-1
FEATURES
DESCRIPTION
application
INFO
available
2
CONNECTION DIAGRAMS
Supply Voltage V
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V
Output Current (Each Output, Source or Sink)
Steady-State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A
Peak Transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3A
Ouput Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-
0.3 to (V
IN
+ 0.3)V
Enable and Shutdown Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-
0.3 to 6.2V
A and B Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-
0.3 to (V
IN
+ 0.3)V
Operating Junction Temperature (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65
to 150
C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
C
ABSOLUTE MAXIMUM RATINGS (Note 1)
UC1708
UC2708
UC3708
NOTE 1: All voltages are with respect to Logic Gnd pin. All currents are positive into, negative out of, device terminals.
NOTE 2: Consult Unitrode Integrated Circuits databook for information regarding thermal specifications and limitations of packages.
DIL-8 (Top View)
J Or N Package
Note: In JE package Pin 4 is logic ground. Pins 5, 12,
and 13 are N/C.
DIL-16 (Top View)
JE or NE Package
SOIC-16 (Top View)
DW Package
8
3
2
1
N/C
6
7
5
4
20 19
9
10 11 12 13
14
16
15
17
18
N/C
SHUTDOWN
LOGIC GND
ENABLE
INPUT
A
N/C
N/C
PW
R
G
ND
A
OUTPUT
A
INPUT
B
N/C
N/C
PW
R
G
ND
B
OUTPUT
B
N/C
N/C
VIN
VIN
N/C
CLCC-20 (Top View)
L Package
3
UC1708
UC2708
UC3708
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
From A,B Input to Output:
Rise Time Delay (TPLH)
CL = 0pF
25
40
ns
CL = 1000pF (Note 3)
25
40
ns
CL = 2200pF
30
45
ns
10% to 90% Rise (TTLH)
CL = 0pF
55
75
ns
CL = 1000pF (Note 3)
25
50
ns
CL = 2200pF
40
55
ns
Fall Time Delay (TPHL)
CL = 0pF
25
40
ns
CL = 1000pF (Note 3)
25
45
ns
CL = 2200pF
35
50
ns
90% to 10% Fall (TTHL)
CL = 0pF
15
20
ns
CL = 1000pF (Note 3)
25
45
ns
CL = 2200pF
40
55
ns
SWITCHING CHARACTERISTICS (Figure 1),
(VIN = 20V, delays measured to 10% output change.)
NOTE 3: These parameters, specified at 1000pF, although ensured over recommended operating conditions, are not tested in
production.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
Supply Current
OutputsLow
18
26
mA
Outputs High
14
18
mA
Enable = 0V
1
4
mA
A, B and Shutdown Inputs Low
Level
0.8
V
A, B and Shutdown Inputs High
Level
2.0
V
A, B Input Current Low
V
A,B
= 0.4V
-1
-0.6
mA
A, B Input Current High
V
A,B
= 2.4V
-200
50
A
A, B Input Leakage Current High
V
A,B
= 35.3V
200
A
Shutdown Input Current Low
V
SHUTDOWN
= 0.4V
20
100
A
Shutdown Input Current High
V
SHUTDOWN
= 2.4V
170
500
A
V
SHUTDOWN
= 6.2V
0.6
1.5
mA
Enable Input Current Low
V
ENABLE
= 0V
-600
-460
200
A
Enable Input Current High
V
ENABLE
= 6.2V
200
A
Enable Threshold Rising
2.8
3.6
V
Enable Threshold Falling
1.0
2.4
3.4
V
Output High Sat., V
IN
- V
OUT
I
OUT
= -50mA
2.0
V
I
OUT
= -500mA
2.5
V
Output Low Sat., V
OUT
I
OUT
= 50mA
0.5
V
I
OUT
= 500mA
2.5
V
Thermal Shutdown
155
C
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, V
IN
=10V to 35V, and these specifications apply
for: 55
o
C<T
A
<125
o
C for the UC1708, 25
o
C<T
A
<+85
o
C for the UC2708, and 0
o
C<T
A
<70
o
C for the UC3708.T
A
= T
J.
4
Note: Shutdown feature available only in JE, NE or DW Packages.
Figure 2: Equivalent Input Circuits
Figure 1: AC Test Circuit and Switching Time Waveforms
4.3V
0V
20V
0V
INPUT
90%
50%
10%
OUTPUT
90%
10%
50%
TP
TP
TT
TT
LH
LH
HL
HL
UDG-92025
UDG-92026
UC1708
UC2708
UC3708
From Shutdown Input to Output
Rise Time Delay (TPLH)
CL = 0pF
25
75
ns
CL = 1000pF (Note 3)
30
75
ns
CL = 2200pF
35
75
ns
10% to 90% Rise (TTLH)
CL = 0pf
50
75
ns
CL = 1000pF (Note 3)
25
50
ns
CL = 2200pF
40
55
ns
Fall Time Delay (TPHL)
CL = 0pF
25
45
ns
CL = 1000pF (Note 3)
30
50
ns
CL = 2200pF
35
55
ns
90% to 10% Fall (TTHL)
CL = 0pF
25
20
ns
CL = 1000pF (Note 3)
25
45
ns
CL = 2200pF
40
55
ns
Total Supply Current
F = 200kHz, 50% duty cycle, both channels; CL = 0pF
23
25
mA
F = 200kHz, 50% duty cycle, both channels; CL = 2200pF
38
45
mA
SWITCHING CHARACTERISTICS (Figure 1),
(VIN = 20V, delays measured to 10% output change.)
NOTE 3: These parameters, specified at 1000pF, although ensured over recommended operating conditions, are not tested in
production.
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