MIC22405YML 查看數據表（PDF） - Micrel

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MIC22405YML

4A Integrated Switch High-Efficiency Synchronous Buck Regulator with Frequency Programmable upto 4MHz

Micrel 

Micrel, Inc.

Ordering Information

Part Number

MIC22405YML

Voltage

Adjustable

Junction Temperature Range

–40° to +125°C

Package

20-Pin 3x4 MLF®*

Note:

1. MLF® is a GREEN ROHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.

Pin Configuration

MIC22405

Lead Finish

Pb-Free

20-Pin 3mm x 4mm MLF® (ML)

Pin Description

Pin Number

Pin Name

1

PG

2

CF

4

COMP

6

7

8

10, 17

11, 16

12, 13, 14, 15

FB

SGND

SVIN

PVIN

PGND

SW

Description

PG (Output): This is an open drain output that indicates when the output voltage is below 90% of

its nominal voltage. The PG flag is asserted without delay when the enable is set low or when the

output goes below the 90% threshold.

Adjustable frequency with external capacitor. Refer to table 2.

Compensation Pin (Input): The MIC22405 uses an internal compensation network containing a

fixed-frequency zero (phase lead response) and pole (phase lag response) which allows the

external compensation network to be much simplified for stability. The addition of a single

capacitor and resistor to the COMP pin will add the necessary pole and zero for voltage mode

loop stability using low-value, low-ESR ceramic capacitors.

Feedback: Input to the error amplifier. The FB pin is regulated to 0.7V. A resistor divider

connecting the feedback to the output is used to adjust the desired output voltage.

Signal Ground: Internal signal ground for all low power circuits.

Signal Power Supply Voltage (Input): This pin is connected externally to the PVIN pin. A 2.2µF

ceramic capacitor from the SVIN pin to SGND must be placed next to the IC.

Power Supply Voltage (Input): The PVIN pins are the input supply to the internal P-Channel

Power MOSFET. A 22µF ceramic is recommended for bypassing at each PVIN pin. The SVIN

pin must be connected to a PVIN pin.

Power Ground: Internal ground connection to the source of the internal N-Channel MOSFETs.

Switch (Output): This is the connection to the drain of the internal P-Channel MOSFET and drain

of the N-Channel MOSFET. This is a high-frequency, high-power connection; therefore traces

should be kept as short and as wide as practical.

June 2011

2

M9999-061511-A

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