MIC5013

Micrel

MIC5013

2

July 2000

Pin Number

Pin Name

Pin Function

1

Input

Resets current sense latch and turns on power MOSFET when taken above

threshold (3.5V typical). Pin 1 requires <1

µA to switch.

2

Threshold

Sets current sense trip voltage according to:

2200

R

+1000

TRIP

V=

TH

where R

trip voltage at turn-on to 2V. Use C

constant.

3

Sense

The sense pin causes the current sense to trip when V

V

a 3 lead FET or a resistor R

4

Source

Reference for the current sense voltage on pin 3 and return for the gate

clamp zener. Connect to the load side of current shunt or kelvin lead of

current sensing FET. Pins 3 and 4 can safely swing to –10V when turning

off inductive loads.

5

Ground

6

Gate

Drives and clamps the gate of the power FET. Pin 6 will be clamped to

approximately –0.7V by an internal diode when turning off inductive loads.

Supply pin; must be decoupled to isolate from large transients caused by

the power FET drain. 10

µF is recommended close to pins 7 and 5.

8

Fault

Outputs status of protection circuit when pin 1 is high. Fault low indicates

normal operation; fault high indicates current sense tripped.

Input Voltage, Pin 1

Threshold Voltage, Pin 2

–0.5 to +5V

Sense Voltage, Pin 3

Source Voltage, Pin 4

Current into Pin 4

50mA

Gate Voltage, Pin 6

–1V to 50V

–0.5V to 36V

Fault Output Current, Pin 8

–1mA to +1mA

Junction Temperature

150

°C

Power Dissipation

1.25W

θ

100

°C/W

θ

170

°C/W

Ambient Temperature: B version

–40

°C to +85°C

Storage Temperature

–65

°C to +150°C

Lead Temperature

260

°C

(Soldering, 10 seconds)

7V to 32V high side

7V to 15V low side

Fault

V+

Gate

1

2

3

4

8

MIC5013

Gnd

7

6

5

Thresh

Sense

Source

Input

Pin Configuration