MP1519
1x, 1.5x, 2x High Efficiency Charge Pump
4 White LED Driver
MP1519 Rev. 1.9 www.MonolithicPower.com 1
7/27/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
TM
DESCRIPTION
The MP1519 is a fully automatic driver for
powering four white LEDs, with up to 4V
forward voltage, from a single Li-Ion or three
NiMH cells. The driver performs all of the
sensing and control to run the LEDs at an
optimum charge pump ratio for efficiency
without an expensive inductor. The driver
allows PWM operation to support brightness
control.
The tiny 3mm x 3mm QFN16 package and
small external capacitors allow for the most
compact white LED solution available.
EVALUATION BOARD REFERENCE
Board Number Dimensions
EV0042 2.4”X x 1.9”Y x 0.4”Z
FEATURES
• 2% LED Current Matching
• High Efficiency (>93%)
• Current Source Outputs
• No Ballast Resistors Required
• 1x, 1.5x and 2x Automatic Modes
• Constant Frequency Operation
• Automatic LED Detection
• High and Low Frequency PWM Capability
• 2.5V to 5.5V Operation
• Less than 1
µA Leakage during Shutdown
• Detects Changes in Battery Level
• No External Schottky Diode Required
• Soft-Start and Soft Switching Operation
APPLICATIONS
• Cell Phones
• PDA or Hand Held Computers
• White LED Application at 3.6V Supply
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
MP1519
C1A
C1B
C2A
C2B
LED1
LED2
LED3
LED4
BATT
EN
RADJ
GND
LEDC
GND
ENABLE
BATT
LED4 LED3 LED2 LED1
4
7
6
9
14
15
16
5, 13
12
11
3, 10
8
1
100
90
80
70
60
50
40
30
20
10
0
EFFICIENCY (%)
2.5 3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
Efficiency vs
Supply Voltage
V
LED
= 3.35V @ 20mA
I
LED
=20mA
I
LED
=10mA
I
LED
=5mA
