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.
1
TM
EV0042 – 1X, 1.5X, 2X CHARGE PUMP 4 WHITE LED DRIVER EV BOARD
EVALUATION BOARD SCHEMATIC
TP1
LED1
LED2
LED3
LED4
VIN
U1
16
15
14
13
LED3
LED2
LED1
1
2
BATT
LED4
NC
EN
RADJ
12
11
10
9
GND
3
4
MP1519
GND
C1A
GND
C2B
5
6
7
EN
Note: Attach the exposed pad to the LEDC pin.
EV0042_S01
EV0042 BILL OF MATERIALS
Qty
2
2
Ref
C1, C2
C3, C4
LED1,
LED2,
LED3,
LED4
R1
R2
R3, R4,
R5, R6
U1
Value Description
1µF
Ceramic Capacitor, 10V, X5R
Package
0805
0805
Manufacturer:
Part No.
TDK:
C2012X5R1A105K
TDK:
C2012X5R0J475K
Distributor:
Part No.
Digikey:
445-1360-1-ND
Digikey:
445-1421-1-ND
4.7µF Ceramic Capacitor, 6.3V, X5R
4
Not Stuffed
Panasonic:
ERJ-6ENF1541V
Panasonic:
ERJ-6GEYJ104V
Yageo:
9C08052A0R00JLHFT
MPS:
MP1519DQ
Digikey:
P1.54KCCT-ND
Digikey:
P100KACT-ND
Digikey:
311-0.0ACT-ND
1
1
4
1
1.54kΩ Resistor, 1%
100kΩ Resistor, 5%
0Ω
Resistor, 5%
White LED Driver
0805
0805
0805
EV0042 Rev. 1.5
10/27/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
LEDC
8
BATT
C2A
C1B
2
TM
EV0042 – 1X, 1.5X, 2X CHARGE PUMP 4 WHITE LED DRIVER EV BOARD
PRINTED CIRCUIT BOARD LAYOUT
Figure 1—Top Silk Layer
Figure 2—Top Layer
Figure 4—Bottom Layer
QUICK START GUIDE
1. Solder LED1 - LED4 to the board.
2. Attach the positive and negatives terminals of the power supply (2.5V – 5.5V) to the VIN and
GND pins, respectively.
3. The board is set up for automatic startup. Drive EN low to shut down the MP1519.
4. To use burst mode brightness control, drive EN with a PWM signal.
NOTICE:
The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
EV0042 Rev. 1.5
10/27/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
3
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