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MP1517

3A, 25V, 1.1MHz Step-Up Converter

Monolithic Power Systems 

The Future of Analog IC Technology

MP1517

3A, 25V, 1.1MHz

Step-Up Converter

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

EV0043

Dimensions

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

VIN

5V

OFF ON

C4

10nF

C5

10nF

4 EN

8

D1

IN

MBR320

SW 9, 10

15

SS

MP1517

3 BP

FB 16

7 OLS

SGND

5, 13

COMP 1

PGND

11, 12

C3

10nF

C6

OPTIONAL

VOUT

12V

MP1517_TAC_S01

Efficiency vs

Load Current

100

95

90

VOUT = 12V

85

80

75

70

65

VOUT = 18V

60

55

50

1

VIN = 5V

10

100

1000

LOAD CURRENT (mA)

MP1517-EC01

MP1517 Rev. 1.4

www.MonolithicPower.com

1

4/28/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

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