MIC2196

Micrel

MIC2196

2

August 2004

Pin Configuration

1

COMP

FB

EN/UVLO

CS

8

VIN

OUTN

GND

VDD

7

6

5

2

3

4

8 Lead SOIC (M)

Ordering Information

Part Number

Output Voltage

Frequency Junction Temp. Range

Package

Standard

Pb-Free

MIC2196BM

MIC2196YM

Adjustable

400KHz

–40

°C to +125°C

8-lead SOIC

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 0.5

µA. 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 1

µF.

6

GND

Ground.

7

OUTN

High current drive for N channel MOSFET. Voltage swing is from ground to

VIN. R

8

VIN

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

circuit.