EV0042 Datasheet, PDF (1/3 Pages) Monolithic Power Systems – 1x, 1.5x, 2x High Efficiency Charge Pump 4 White LED Driver Evaluation Board

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.
ELECTRICAL SPECIFICATIONS
Parameter
# of WLEDs
Input Voltage
LED Current
Symbol
V_IN
I_LED
Value
4
2.5 – 5.5
20
Units
V
mA
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 1µA 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.
EV0042 EVALUATION BOARD
(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
Efficiency vs
Supply Voltage
V_LED = 3.35V @ 20mA
100 _ILED=5mA
90
I_LED=20mA
80
70
60
50
40
I_LED=10mA
30
20
10
0
2.5 3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
MP1519-EC01
EV0042 Rev. 1.5
www.MonolithicPower.com
1
10/27/2005
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© 2005 MPS. All Rights Reserved.