MP1517

3A, 25V, 1.1MHz

Step-Up Converter

MP1517 Rev. 1.4

www.MonolithicPower.com

1

4/28/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP1517 is a 3A, fixed frequency step-up

converter ideal for medium-to-high current

step-up, flyback and SEPIC applications. The

high 1.1MHz switching frequency allows for

smaller external components producing a

compact solution for size constrained cameras,

PDAs and cell phones. The low 0.7V feedback

voltage offers higher efficiency in white LED

driver applications including cell phone camera

flash. The MP1517 regulates the output voltage

up to 25V with efficiencies as high as 95%.

Soft-start, cycle-by-cycle current limiting, and

input

under

voltage

lockout

prevent

overstressing or damage to sensitive external

circuitry at startup and output short-circuit

conditions.

Current-mode

regulation

and

external compensation components allow the

MP1517 control loop to be optimized over a

wide variety of input voltage, output voltage,

and load current conditions. The MP1517 is

available in the thermally enhanced QFN16

(4mm x 4mm) package.

EVALUATION BOARD REFERENCE

Board Number

Dimensions

EV0043

2.5”X x 2.0”Y x 0.4”Z

FEATURES

• 4A Peak Current Limit

• Low 700mV Feedback Threshold

• Internal 150mΩ Power Switch

• Input Range of 2.6V to 25V

• Up to 95% Efficiency

• Zero Current Shutdown Mode

• Under Voltage Lockout Protection

• Open Load Protection

• Soft-Start Operation

• Thermal Shutdown

• Tiny 4mm x 4mm 16-Pin QFN Package

APPLICATIONS

• Boost and SEPIC Regulators

• Handheld Computers

• Cell Phone Camera Flash, PDAs

• Digital Still and Video Cameras

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP1517

IN

8

COMP

FB

SW

1

16

9, 10

SGND

PGND

5, 13

11, 12

EN

SS

BP

OLS

4

15

3

7

C5

10nF

C4

10nF

C3

10nF

C6

OPTIONAL

OFF ON

5V

D1

MBR320

12V

MP1517_TAC_S01

100

95

90

85

80

75

70

65

60

55

50

LOAD CURRENT (mA)

MP1517-EC01

Efficiency vs

Load Current

1

10

100

1000