MPS EV0062 1.3mhz low power led torch/flash driver Datasheet

EV0062 (MP1541)
1.3MHz Low Power
LED Torch/Flash Driver
Monolithic Power Systems
EVALUATION BOARD - INITIAL RELEASE
GENERAL DESCRIPTION
FEATURES
The EV0062 is an evaluation board designed to
drive up to four (4) white LEDs in series. The
board is based on MPS’ MP1541 SOT23
current mode step up converter. The MP1541 is
intended for small, low power applications. The
MP1541 switches at 1.3MHz and allows the use
of tiny, low cost capacitors and inductors 2mm
or less in height. Internal soft start results in
small inrush current and extends the battery
life. The MP1541 operates from an input voltage
as low as 2.5V and can generate 12V at up to
200mA from a 5V supply.
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The MP1541 includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload. The MP1541 is available in a small
5-lead TSOT23 package.
ELECTRICAL SPECIFICATION
Parameter
Symbol
Value
Units
VIN
2.5 – 6
V
LED Current (Torch)
IOUT1
20
mA
LED Current (Flash)
IOUT2
100
mA
Supply Voltage
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On Board Power MOSFET
Uses Tiny Capacitors and Inductors
1.3MHz Fixed Switching Frequency
Internally Compensated
Internal Soft Start
Operates with Input Voltage as Low as 2.5V
and Output Voltage as High as 22V
12V at 200mA from 5V Input
UVLO, Thermal Shutdown
Internal Current Limit
Available in a TSOT23-5 Package
APPLICATIONS
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Camera Phone Flash
Handheld Computers and PDAs
Digital Still and Video Cameras
External Modems
Small LCD Displays
White LED Driver
, “MPS”, “Monolithic Power Systems”, and “The Future of Analog IC
Technology” are Registered Trademarks of Monolithic Power Systems, Inc.
EV0062 EVALUATION BOARD
Waveform in Flash Mode
VFLASH
2V/Div.
0
VOUT
5V/Div.
0
(2.5”X x 2.5”Y x 0.8”Z)
Board Number
MPS IC Number
EV0062 Rev. B
MP1541
06/04, Rev. 1.0
www.MonolithicPower.com
VIN = 3.6V (3 LEDs)
EV0062_MP1541_TAC_EC01
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EV0062 (MP1541) 1.3MHz LOW POWER TORCH/FLASH LED DRIVER
EVALUATION BOARD - INITIAL RELEASE
EVALUATION BOARD SCHEMATIC
D1
MBR0520L
VIN
5V
VOUT
LED1
LED2
GND
5
EN
GND
LED3
4
2
IN
EN
1
LED4
SW
3
FB
MP1541
GND
Q1
FLASH
EV0062_MP1541_SCH01
EV0062 BILL OF MATERIALS
Qty
Ref
Description
Package
Manufacturer P/N
Distributor P/N (1)
1
C1
1210
Panasonic: ECJ-4YB1A106K
PCC2170CT-ND
1
C2
Ceramic Capacitor, 10uF,
10V, X5R
Ceramic Capacitor, 1uF,
16V, X5R
Schottky Diode, 0.5A, 20V
Inductor, 10uH, 1.7A
N-Channel Mosfet, 60V, 3A
1.3MHz Boost Converter
Resistor, 100kΩ, 5%
Resistor, 470kΩ, 5%
Resistor, 61.9Ω, 1%
Resistor, 15.4Ω, 1%
1206
Panasonic: ECJ-3YB1C105K
PCC1882CT-ND
SOD-123
Fairchild: MBR0520L
Sumida: CDRH6D28-100NC
Zetex: ZXMN6A08E6TA
MPS: MP1541
Panasonic: ERJ-6ENF1003V
Panasonic: ERJ-6GEYJ474V
Panasonic: ERJ-6ENF61R9V
Panasonic: ERJ-6ENF15R4V
MBR0520LCT-ND
1
1
1
1
1
1
1
1
1
1
1
1
D1
L1
Q1
U1
R1
R2
R3
R4
LED1 Flash LED (2)
LED2 Flash LED (2)
SOT23-6
SOT23-5
0603
0603
0603
0603
ZXMN6A08E6CT-ND
P100KCCT-ND
P470KACT-ND
P61.9CCT-ND
P15.4CCT-ND
LED3 Flash LED (2)
LED4 Flash LED (2)
Note
1) Distributor: Digikey
2) Not included with board.
06/04, Rev. 1.0
www.MonolithicPower.com
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EV0062 (MP1541) 1.3MHz LOW POWER TORCH/FLASH LED DRIVER
EVALUATION BOARD - INITIAL RELEASE
PRINTED CIRCUIT BOARD LAYOUT
Figure 1—Top Silk Layer
Figure 2—Top Layer
Figure 3— Bottom Layer
06/04, Rev. 1.0
www.MonolithicPower.com
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EV0062 (MP1541) 1.3MHz LOW POWER TORCH/FLASH LED DRIVER
EVALUATION BOARD - INITIAL RELEASE
QUICK START GUIDE
1. Connect LEDs to LED1 – LED4 terminals.
2. Preset Power Supply to 2.5V – 6V.
3. Turn Off Power Supply.
4. Connect Power Supply terminals to:
a. Positive (+): VIN
b. Negative (–): GND
5. Turn Power Supply On after making connections.
6. The MP1541 is automatically enabled on the demo board once VIN is applied.
7. Drive FLASH of Q1 with a pulsed signal (3V or above for High, 0V for Low) to switch between
two (2) LED currents.
8. IOUT1 is set to 20mA on the board.
9. IOUT2 is set to 100mA on the board.
NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change without
notice. Contact MPS for current specifications. MPS encourages users of its products to ensure that third party Intellectual
Property rights are not infringed upon when integrating MPS products into any application. MPS cannot assume any legal
responsibility for any said applications.
EV0062 (MP1541) Rev. 1.0
6/10/04
© 2004 MPS, Inc.
Monolithic Power Systems, Inc.
983 University Avenue, Building A, Los Gatos, CA 95032 USA
Tel: 408-357-6600 ♦ Fax: 408-357-6601 ♦ www.MonolithicPower.com
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