MP1543 datasheet(4/9 Pages) MPS

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MP1543 — 1.5A, 500KHZ SYNCHRONOUS RECTIFIED STEP-UP CONVERTER

MP1543 Rev. 1.0

www.MonolithicPower.com

1/11/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

1.6

1.4

1.2

1.0

0.8

20406080

100

DUTY CYCLE (%)

MP1543-TPC12

Current Limit vs

Duty Cycle

380

370

360

350

340

330

320

310

300

-40

120

TEMPERATURE (

°C)

MP1543-TPC11

Quiescent Current vs

Temperature

88.10

88.05

88.00

87.95

87.90

87.85

87.80

-40

120

TEMPERATURE (

°C)

MP1543-TPC10

Maximum Duty Cycle

vs Temperature

PIN FUNCTIONS

Pin #

Name

Description

Regulation Feedback Input. Connect to an external resistive voltage divider from the output to

FB to set the output voltage.

GND

Ground.

OUT

Supply Input for the MP1543. Connect to the output of the converter.

Output Switching Node. SW is the drain of the internal low-side N-Channel MOSFET and

high-side P-Channel MOSFET. Connect the inductor to SW to complete the step-up converter.

Regulator On/Off Control Input. A logic high input (VEN > 1.4V) turns on the regulator. A logic

low input (VEN < 0.4V) puts the MP1543 into low current shutdown mode.

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