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PDF MP3204 Data sheet ( Hoja de datos )
| Número de pieza | MP3204 | |
| Descripción | 1.3MHz Fixed Frequency 5 White LED Driver | |
| Fabricantes | MPS | |
| Logotipo |  |
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TM
MP3204
1.3MHz Fixed Frequency
5 White LED Driver with Open LED Protection
The Future of Analog IC Technology TM
DESCRIPTION
The MP3204 is a step-up converter designed
for driving up to 5 series white LEDs from a
single cell Lithium Ion battery. The MP3204
uses current mode, fixed frequency architecture
to regulate the LED current, which is measured
through an external current sense resistor. Its
low 104mV feedback voltage reduces power
loss and improves efficiency. The OV pin
monitors the output voltage and turns off the
converter if an over-voltage condition is present
due to an open circuit condition.
The MP3204 includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload. The MP3204 is available in a small
6-pin TSOT23 package.
EVALUATION BOARD REFERENCE
Board Number
EV3204DJ-00A
Dimensions
1.9”X x 1.8”Y x 0.4”Z
FEATURES
• On Board Power MOSFET
• Drives up to 5 Series White LEDs
• Up to 87% Efficiency
• Over 1MHz Fixed Switching Frequency
• Low 104mV Feedback Voltage
• Soft-Start/PWM Dimming
• UVLO, Thermal Shutdown
• Internal Current Limit
• Open Load Shutdown
• Available in a TSOT23-6 Package
APPLICATIONS
• Cell Phones
• Handheld Computers and PDAs
• Digital Still Cameras
• Small LCD Displays
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
VIN
5V
61
EN
4
IN
EN
SW
OV
5
2
MP3204
GND
FB
3
LED1
LED2
LED3
LED4
LED5
MP3204-TAC-S01
Efficiency vs
LED Current
88
87 4 LEDs
86
85
84
83
82
5 LEDs
81
80
79
78
77
5
3 LEDs
VIN=3.6V
10 15
LED CURRENT (mA)
20
MP3204-EC01
MP3204 Rev. 1.3
9/23/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
1
1 page  
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MP3204 – 6V, 1.3MHz WHITE LED DRIVER
APPLICATION INFORMATION
VIN
2.5V to 6V
CMDSH-3
LED1
OFF ON
61
IN SW
4
2
EN MP3204
GND
OV
FB
5
3
LED2
LED3
MP3204_F02
Figure 2—Driving 3 White LEDs
A typical application circuit can be seen in
Figure 2. The 3 white LEDs can be driven from
a voltage supply range of 2.5V to 6V at an
output current of 20mA. A 0.22µF output
capacitor is sufficient for most applications but
an output capacitor of up to 1µF may be used.
A 22µH inductor with low DCR (inductor
resistance) is recommended for improved
efficiency. A 1µF ceramic capacitor is
recommended for the input capacitance in the
real system. Schottky diodes have fast recovery
times and a low forward voltage and are also
recommended. Schottky diodes with ratings of
100mA to 200mA are sufficient for use with the
MP3204. The switching characteristics during
normal operation can be seen in Figure 3. The
MP3204 has internal soft-start to limit the
amount of current through VIN at startup and to
also limit the amount of overshoot on the
output. The current limit is increased by a fourth
every 40µs, giving a total soft start time of
120µs.
VSW
5V/div.
VOUT RIPPLE
(AC COUPLED)
50mV/div.
IL
100mA/div.
MP3204_F03
Figure 3—Steady-State Operation
(VIN=3.6V, 3 LEDs, 20mA)
MP3204 Rev. 1.3
9/23/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MP3204.PDF ] | |
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