MP9141ES-LF-Z データシートの表示（PDF） - Monolithic Power Systems

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MP9141ES-LF-Z

1.8A Step-Down DC to DC Converter

Monolithic Power Systems 

MP9141 – 1.8A STEP-DOWN DC TO DC CONVERTER

MPS CONFIDENTIAL AND PROPRIETARY INFORMATION– INTERNAL USE ONLY

For Example:

VOUT = 3.3V

C7 = 22µFCeramic(ESR = 10mΩ)

( ) ( ) R1 ≈ 1.37 × 108 × 22 × 10 −6 × 3.3 = 9.9kΩ

Use the nearest standard value of 10kΩ.

( ( ) ) C5 ≈ 0.22 × 22 × 10−6 × 3.3 = 1.6nF

10 × 103

Use the nearest standard value of 1.5nF.

Negative Output Voltage

The MP9141 can be

buck-boost converter to

output voltages.

configured as a

generate negative

Because the GND pin of the IC is now

connected to negative output voltage, the

maximum allowable input voltage is the IC input

voltage rating (20V) minus the negative output

voltage value. A typical application circuit is

shown in Figure 2.

2π × C7 × RESR × fC = 0.014

This value is less than 1, therefore no second

compensation capacitor is required.

TYPICAL APPLICATION CIRCUITS

INPUT

4.75V to 10V

IN

BS

SW

MP9141

OFF ON

EN

GND

FB

COMP

C6

OPEN

C3

10nF

C5

10nF

B230

Figure 2—Application Circuit for –5V Supply

OUTPUT

-5V/0.8A

MP9141_F02

MP9141 Rev. 1.11

www.MonolithicPower.com

9

4/18/2011

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2011 MPS. All Rights Reserved.

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