MIC5010

Micrel

5-88

April 1998

Pin Number

Pin Name

Pin Function

1

Inhibit

Inhibits current sense function when connected to supply. Normally

grounded.

3

Input

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

threshold (3.5V typical). Pin 3 requires <1

µA to switch.

4

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.

5

Sense

The sense pin causes the current sense to trip when V

V

a 3 lead FET or a resistor R

6

Source

Reference for the current sense voltage on pin 5 and return for the gate

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

current sensing FET. Pins 5 and 6 can safely swing to –10V when turning

off inductive loads.

7

Ground

8

Gate

Drives and clamps the gate of the power FET. Pin 8 will be clamped to

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

9, 10, 11

C2, Com, C1

Optional 1nF capacitors reduce gate turn-on time; C2 has dominant effect.

13

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

the power FET drain. 10

µF is recommended close to pins 13 and 7.

14

Fault

Outputs status of protection circuit when pin 3 is high. Fault low indicates

normal operation; fault high indicates current sense tripped.

Inhibit Voltage, Pin 1

–1V to V+

Input Voltage, Pin 3

–10V to V+

Threshold Voltage, Pin 4

– 0.5 to +5V

Sense Voltage, Pin 5

–10V to V+

Source Voltage, Pin 6

–10V to V+

Current into Pin 6

50 mA

Gate Voltage, Pin 8

–1V to 50V

–0.5V to 36V

Fault Output Current, Pin 14

–1mA to +1mA

Junction Temperature

150

°C

Power Dissipation

1.56W

θ

80

°C/W

θ

115

°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

Pin Configuration

Inhibit

Input

Thresh

Sense

Source

Gnd

Fault

V+

C1

Com

C2

Gate

1

2

3

4

5

6

7

8

9

10

11

12

13

14

MIC5010

NC

NC