MIC2230 datasheet(3/18 Pages) MICREL

3 / 18 page

Micrel, Inc.

MIC2230

April 2010

M9999-040810-C

Pin Description

Pin Number

Adjustable

Pin Number

Fixed

Pin Name

–

FB2

Feedback 2: For adjustable voltage options connect the

external resistor divider network to FB2 to set the output

voltage of regulator 2. Nominal value is 0.8V.

EN2

Enable 2 input. Logic low powers down regulator 2. Logic

high powers up regulator 2. MIC2230 features built-in soft-

start circuitry that reduces in-rush current and prevents the

output voltage from overshooting at start up.

AVIN

Analog Supply Voltage: Supply voltage for the analog control

circuitry. Requires bypass capacitor to GND.

SW2

Switch node for regulator 2, connected to external inductor.

AGND

Analog (signal) ground.

PGND

Power ground.

/FPWM

Forced PWM Mode Bar. Grounding this pin forces the device

to stay in constant frequency PWM mode only. Pulling this

pin high enables automatic Trickle Mode

TM operation.

SW1

Switch node for regulator 1, connected to external inductor.

VIN

Supply Voltage: Supply voltage for the internal switches and

drivers.

PGOOD

Power Good Output. This output is pulled down unless the

regulator 1 output voltage is within +6.25% and -8.5% of

regulation. After the output voltage is in regulation, the output

starts to go high with an internal 5µA current source. A delay

time could be programmed by tying a capacitor to this pin.

EN1

Enable 1 input. Logic low powers down regulator 1. Logic

high powers up regulator 1. MIC2230 features built-in soft-

start circuitry that reduces in-rush current and prevents the

output voltage from overshooting at start up.

–

FB1

Feedback 1: For adjustable voltage options connect to the

external resistor divider network to FB1 to set the output

voltage of regulator 1. Nominal value is 0.8V.

–

OUT2

Output Voltage 2. For fixed output voltage options connect

OUT2 to the output voltage of regulator 2.

–

OUT1

Output Voltage 1. For fixed output voltage options connect

OUT1 to the output voltage of regulator 1.

Back-side pad.

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