Texas Instruments UC3708Q, UC3708NE, UC3708N, UC3708JE, UC3708J Datasheet

UC1708

UC2708

UC3708

Dual Non-Inverting Power Driver

FEATURES

∙3.0A Peak Current Totem Pole Output

∙5 to 35V Operation

∙25ns Rise and Fall Times

∙25ns Propagation Delays

∙Thermal Shutdown and UnderVoltage 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

DESCRIPTION

The UC1708 family of power drivers is made with a high-speed, highvoltage, 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 VIN. 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 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 0oC to +70oC temperature range and industrial temperature range of -25oC to +85oC respectively. For operation over a -55oC to +125oC temperature range, the UC1708 is available in hermetically sealed 8-pin MINIDIP and 16 pin DIP packages. Surface mount devices are also available.

BLOCK DIAGRAM

UDG-92024-1

Note: Shutdown feature available only in JE , NE or DW packages.

3/97

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ABSOLUTE MAXIMUM RATINGS (Note 1)

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

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.

UC1708

UC2708

UC3708

CONNECTION DIAGRAMS

DIL-8 (Top View)

J Or N Package

SOIC-16 (Top View)

DW Package

DIL-16 (Top View) JE or NE Package

Note: In JE package Pin 4 is logic ground. Pins 5, 12, and 13 are N/C.

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, VIN=10V to 35V, and these specifications apply for: –55oC<TA<125oC for the UC1708, –25oC<TA<+85oC for the UC2708, and 0oC<TA<70oC for the UC3708. TA = TJ.

PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNITS
VIN Supply Current	OutputsLow		18	26	mA
	Outputs High		14	18	mA
	Enable = 0V		1	4	mA
A, B and Shutdown Inputs Low				0.8	V
Level
A, B and Shutdown Inputs High		2.0			V
Level
A, B Input Current Low	VA,B = 0.4V	-1	-0.6		mA
A, B Input Current High	VA,B = 2.4V	-200		50	μA
A, B Input Leakage Current High	VA,B = 35.3V			200	μA
Shutdown Input Current Low	VSHUTDOWN = 0.4V		20	100	μA
Shutdown Input Current High	VSHUTDOWN = 2.4V		170	500	μA
	VSHUTDOWN = 6.2V		0.6	1.5	mA

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