3/97
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, highvoltage, Schottky p rocess to interface control functions and high-power
switching devices – par t icula rly p ower MOS FETs. Operating over a 5 to
35 volt supply range, thes e devices conta in two inde pendent 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 l ow in commo n through t he action of either a digital
high signal at the Shutdown terminal or by forcing the Enable terminal
low. The Shutdown ter minal w ill only force the output s low, it will not effect the behavior 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 MINIDIP and 16pin "bat-wing" DIP packages for commercial operation over a 0
o
C to
+70
o
C temperatu re range and industrial temperature range of -25oC to
+85
o
C respectively. For operation over a -55oC to +125oC temperature
range, the UC1 708 is available in hermetically sealed 8-pin MINIDIP and
16 pin DIP packages. Surface mount devices are also available.
UC1708
UC2708
UC3708
Dual Non-Inverting Power Driver
Note: Shutdown f ea tu re available only in JE , NE or DW packages.
UDG-92024-1
FEATURES DESCRIPTION
1
CONNECTION DIAGRAMS
Supply Voltage VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V
Output Current (Each Output, Source or Sink)
Steady-State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A
Peak Transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3A
Ouput Voltage . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN + 0.3)V
Enable and Shutdown Inputs . . . . . . . . . . . . . . . . . -0.3 to 6.2V
A and B Inputs . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN + 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 specif ications and limitations of
packages.
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
µ
A
A, B Input Leakage Current High V
A,B
= 35.3V 200
µ
A
Shutdown Input Current Low V
SHUTDOWN
= 0.4V 20 100
µ
A
Shutdown Input Current High V
SHUTDOWN
= 2.4V 170 500
µ
A
V
SHUTDOWN
= 6.2V 0.6 1.5 mA
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, VIN=10V to 35V, and thes e sp ec ifications apply for:
–55oC<TA<125oC for the UC1708, –25oC<TA<+85oC for the UC2708, and 0oC<TA<70oC for the UC3708. T
A
= T
J.
DIL-8 (T op Vie w)
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 (T op View)
DW Package
2
UC1708
UC2708
UC3708
SWITCHING CHARACTERISTICS (Figure 1)
(VIN = 20V, delays measured t o 10 % ou tp ut change.)
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
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 cy cl e, both channels; CL = 0pF 23 25 mA
F = 200kHz, 50% duty cy cl e, both channels; CL = 2200 pF 38 45 mA
NOTE 3: These parameters, specified at 1000pF, although guaranteed over recommended operating conditions, are not tested in
production.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Enable Input Cu rrent Low V
ENABLE
= 0V -600 -460 200
µ
A
Enable Input Current High V
ENABLE
= 6.2V 200
µ
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 (cont.):
Unless otherwise stated, VIN = 10V to 35V, and these sp ec if ic at ions apply
for: –55oC<TA<125oC for the UC1708, –25oC<TA<+85oC for the UC2708, and 0oC<TA<70oC for the UC3708. TA = T
J.
3
Note: Shutdown feature ava il able only in JE, NE or DW P ackages.
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
Figure 2: Equivalent Input Circuits
4.3V
0V
20V
0V
INPUT
90%
50%
10%
OUTPUT
90%
10%
50%
TP
TP
TT
TT
LH
LH
HL
HL
Figure 1: AC Test Circuit and Switching Time Waveforms
UDG-92025
UDG-92026
UC1708
UC2708
UC3708
4
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