MIC2245 Ver la hoja de datos (PDF) - Micrel

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componentes Descripción

Fabricante

MIC2245

4MHz PWM Synchronous Buck Regulator with LDO Standby Mode

Micrel 

Micrel, Inc.

MIC2245

Ordering Information

Part Number

Output

Voltage*

Junction

Temperature Range

MIC2245YML

Adj.

–40° to +125°C

Note:

* Other Voltage options available. Contact Micrel for details.

Package

10-Pin 3x3 MLF™

Lead Finish

Pb-free

Pin Configuration

AGND 1

LDO 2

BIAS 3

AVIN 4

FB 5

10 PGND

9 SW

8 VIN

7 LOWQ

EP

6 EN

10-Pin 3mm x 3mm MLF (ML)

Pin Description

Pin Number

1

2

3

4

5

6

7

8

9

10

EP

Pin Name

AGND

LDO

BIAS

AVIN

FB

EN

_____

LOWQ

VIN

SW

PGND

GND

Pin Function

Analog (signal) Ground.

LDO Output (Output): Connect to VOUT for LDO mode operation.

Internal circuit bias supply. Must be filtered from input voltage through an RC

1

lowpass filter with a cutoff frequency ≥ 2π(20.5Ω)(100nF) .

Analog Supply/Input Voltage (Input): Supply voltage for the analog control

circuitry and LDO input power. Requires bypass capacitor to GND.

Feedback. Input to the error amplifier. For the Adjustable option, connect to the

external resistor divider network to set the output voltage. For fixed output

voltage options, connect to VOUT and an internal resistor network sets the output

voltage.

Enable (Input). Logic low will shut down the device, reducing the quiescent

current to less than 5µA.

Enable LDO Mode (Input): Logic low enables the internal LDO and disables the

PWM operation. Logic high enables the PWM mode and disables the LDO

mode.

Supply/Input Voltage (Input): Supply voltage for the internal switches and

drivers.

Switch (Output): Internal power MOSFET output switches.

Power Ground.

Ground, backside pad.

January 2006

2

M9999-012406

www.micrel.com

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