MP1519 MPS, MP1519 Datasheet - Page 5

• Manufacturer Part Number: MP1519
• Description: High Efficiency Charge Pump 4 White LED Driver
• Manufacturer: MPS

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.
MP1519 Rev. 1.9
7/27/2006
ENABLE
BATT
TM
RADJ
BATT
GND
5, 13
3, 10
EN
12
11
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
GENERATOR
REFERENCE
CURRENT
BANDGAP
BATTERY
SENSOR
1.25V
SHUTDOWN
Figure 1—Functional Block Diagram
MP1519 – 1X, 1.5X, 2X CHARGE PUMP 4 WHITE LED DRIVER
© 2006 MPS. All Rights Reserved.
CONTROLLER
PUMP
MODE
www.MonolithicPower.com
START
SOFT
CHARGE PUMP
FAULT
FAULT
FAULT
FAULT
ENABLE
LED
The MP1519 employs soft switching and
soft-start to prevent overloading the battery
source at turn-on and charge pump mode
switching.
While
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.
CURRENT
CURRENT
CURRENT
CURRENT
SOURCE
SOURCE
SOURCE
SOURCE
ISET
operating,
LED1
14
LED2
15
LED3
16
LED4
1
LEDC
8
C1A
4
C1B
7
C2A
6
C2B
9
the
LED4
MP1519
LED3
continually
LED2
LED1
5