TM
EV0042
1x, 1.5x, 2x High Efficiency Charge Pump
4 White LED Driver Evaluation Board
The Future of Analog IC Technology
TM
GENERAL DESCRIPTION
The EV0042 is an evaluation board for the
MP1519, 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.
FEATURES
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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
µ
A Leakage during Shutdown
Detects Changes in Battery Level
No External Schottky Diode Required
Soft-Start and Soft Switching Operation
Cell Phones
PDA or Hand Held Computers
White LED Application at 3.6V Supply
ELECTRICAL SPECIFICATIONS
Parameter
# of WLEDs
Input Voltage
LED Current
Symbol
V
IN
I
LED
Value
4
2.5 – 5.5
20
Units
V
mA
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
EV0042 EVALUATION BOARD
Efficiency vs
Supply Voltage
100
90
80
EFFICIENCY (%)
V
LED
= 3.35V @ 20mA
I
LED
=5mA
I
LED
=20mA
70
60
50
40
30
20
10
0
2.5
3.0
3.5
4.0
SUPPLY VOLTAGE (V)
4.5
I
LED
=10mA
(L x W x H) 2.4” x 1.9” x 0.4”
(6.1cm x 4.8cm x 1.0cm)
Board Number
EV0042
MPS IC Number
MP1519DQ
MP1519-EC01
EV0042 Rev. 1.5
10/27/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
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MPS [ MONOLITHIC POWER SYSTEMS ]
