Micrel, Inc.

MIC2196

September 2008

2

M9999-092908

Ordering Information

Part Number

Voltage

Frequency

Temperature Range

Package

Lead Finish

MIC2196BM

Adj.

400kHz

–40°C to +125°C

8-Pin SOIC

Standard

MIC2196YM

Adj.

400kHz

–40°C to +125°C

8-Pin SOIC

Pb-Free

Pin Configuration

1

COMP

FB

EN/UVLO

CS

8VIN

OUTN

GND

VDD

7

6

5

2

3

4

8-Pin SOIC (M)

Pin Description

Pin Number

Pin Name

Pin Function

1

COMP

Compensation (Output): Internal error amplifier output. Connect to a capacitor or

series RC network to compensate the regulator’s control loop.

2

FB

Feedback (Input): Regulates FB to 1.245V.

3

EN/UVLO

Enable/Undervoltage Lockout (input): A low level on this pin will power down the

device, reducing the quiescent current to under 0.5μA. This pin has two separate

thresholds, below 1.5V the output switching is disabled, and below 0.9V the device is

forced into a complete micropower shutdown. The 1.5V threshold functions as an

accurate undervoltage lockout (UVLO) with 100mV hysteresis.

4

CS

The (+) input to the current limit comparator. A built in offset of 100mV between CS

and GND in conjunction with the current sense resistor sets the current limit threshold

level. This is also the (+) input to the current amplifier.

5

VDD

3V internal linear-regulator output. VDD is also the supply voltage bus for the chip.

Bypass to GND with 1μF.

6

GND

Ground.

7

OUTN

High current drive for N-Channel MOSFET. Voltage swing is from ground to VIN.

8

VIN

Input voltage to the control IC. This pin also supplies power to the gate drive circuit.