MP1580

2A, 380 KHz

Step-Down

Converter

MP1580 Rev. 2.9w

www.MonolithicPower.com

1

8/11/2005

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2005 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

DESCRIPTION

The MP1580 is a monolithic step-down switch
mode converter with a built in internal power
MOSFET. It achieves 2A continuous output
current over a wide input supply range with
excellent load and line regulation.

Current mode operation provides fast transient
response and eases loop stabilization.

Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown. In
shutdown mode the regulator draws 23µA of
supply current.

The MP1580 requires a minimum number of
readily available standard external components. A
synchronization pin allows the part to be driven to
600KHz.

EVALUATION BOARD REFERENCE

Board Number

Dimensions

EV0007

2.3”X x 1.5”Y x 0.5”Z

FEATURES

• 2A Output Current

• 0.18Ω Internal Power MOSFET Switch

• Stable with Low ESR Output Ceramic

Capacitors

• Up to 95% Efficiency

• 23µA Shutdown Mode

• Fixed 380KHz Frequency

• Thermal

Shutdown

• Cycle-by-Cycle Over Current Protection

• Wide 4.75 to 25V Operating Input Range
• Output Adjustable from 1.22V to 21V

• Programmable Under Voltage Lockout

• Frequency Synchronization Input

• Available in an 8-Pin SO Package

APPLICATIONS

• Distributed

Power

Systems

• Battery

Chargers

• Pre-Regulator for Linear Regulators

“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.

TYPICAL APPLICATION

MP1580_TAC_S01

MP1580

SW

IN

BS

FB

SYNC

COMP

GND

EN

OUTPUT
2.5V / 2A

INPUT

4.75V to 25V

OPEN

NOT USED

OFF ON

C6

OPEN

C3

2.2nF

C5

10nF

D1

6

5

3

1

2

7

8

4

EFFICIENCY

(%)

95

90

85

80

75

70

OUTPUT CURRENT (A)

MP1580_TAC_EC01

Efficiency vs
Output Current Voltage

0

0.5

1.5

1

2

V

OUT

= 5.0V

V

OUT

= 3.3V

V

OUT

= 2.5V

V

IN

= 10V