MP1519DQ-LF-Z データシートの表示（PDF） - Monolithic Power Systems

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MP1519DQ-LF-Z

1x, 1.5x, 2x High Efficiency Charge Pump 4 White LED Driver

Monolithic Power Systems 

TM

MP1519 – 1X, 1.5X, 2X CHARGE PUMP 4 WHITE LED DRIVER

OPERATION

The MP1519 is a charge pump that drives 4

LEDs from a 2.5V to 5.5V input voltage. It

automatically switches between 1x, 1.5x and 2x

charge pump modes to optimize efficiency while

maintaining LED current regulation.

Four drivers independently regulate the current

through the LEDs, therefore matching LEDs are

not required.

The MP1519 employs soft switching and

soft-start to prevent overloading the battery

source at turn-on and charge pump mode

switching.

While operating, the MP1519 continually

monitors the LED current and battery voltage

and automatically switches between charge

pump modes to retain LED current regulation

through all LEDs as the battery voltage

fluctuates.

BATT

ENABLE

BATT

5, 13

BATTERY

SENSOR

EN

12

FAULT

CURRENT

SOURCE

FAULT

CURRENT

SOURCE

CONTROLLER

FAULT

CURRENT

SOURCE

RADJ

11

SHUTDOWN

CURRENT

GENERATOR

FAULT

CURRENT

SOURCE

LED

ENABLE

ISET

PUMP SOFT

MODE START

1.25V

BANDGAP

REFERENCE

CHARGE PUMP

GND

3, 10

LED1

14

LED2

15

LED3

16

LED4

1

LED4 LED3 LED2 LED1

LEDC

8

C1A

4

C1B

7

C2A

6

C2B

9

Figure 1—Functional Block Diagram

MP1519 Rev. 1.9

www.MonolithicPower.com

5

7/27/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

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