MIC2040/2041

Micrel

M9999-012004

2

January 2005

Pin Configuration

ILIM

VBIAS

6

5

1

EN

/FAULT

UVLOIN

GND

10 VOUT

VIN

VOUT

VIN

9

8

7

2

3

4

MIC2040/MIC2041

10-Pin MSOP (MM)

Pin Description

Pin Number

Pin Name

Pin Function

1EN

Switch Enable Input: Gate control pin of the output MOSFET available as an

active high (–1) or active low (–2) input signal.

2

/FAULT

Fault Status Output: Open drain N-Channel device, active low. This pin

indicates an overcurrent, or thermal shutdown condition. For an overcurrent

event, /FAULT is asserted if the duration of the overcurrent condition lasts

longer than 28ms.

4

GND

Ground Connection: Tie to analog ground.

5

ILIM

Current Limit Set: A resistor, R

limit threshold as CLF/R

the electrical characteristics table. For the MIC2040/41, the continuous

output current range is 0.25A to 1.5A.

7, 9

VIN

Switch Input Supply: The drain of the output MOSFET. The range of input

for the switch is 0.8V to 5.5V. These pins must be externally connected

together.

8, 10

VOUT

Switch Output: The source of the output MOSFET. These pins must be

externally connected together.

6

VBIAS

Bias Supply Input: This input pin supplies bias to operate the switch with

range from 1.6V to 5.5V. When switching voltage (V

5.5V and the use of a single supply is desired, connect VBIAS to VIN

externally.

3

UVLOIN

Undervoltage Lockout Adjust Input: With this pin left open, the UVLO

threshold is internally set to 1.45V. When the switching voltage (V

below 1.6V, connecting an external resistive divider to this input will lower

the UVLO threshold. The total resistance must be less than 200kΩ. See

“Applications Information” for further detail.