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MP3204DJ-LF-Z

P1-P3P4-P6P7-P7
MP3204
1.3MHz Fixed Frequency
5 White LED Driver with Open LED Protection
MP3204 Rev. 1.4 www.MonolithicPower.com 1
10/8/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
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 Dimensions
EV3204DJ-00A 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
MP3204
V
IN
5V
LED1
LED2
LED3
LED4
LED5
EN
FB
OV
EN
1
5
32
4
6
SWIN
GND
88
87
86
85
84
83
82
81
80
79
78
77
EFFICIENCY (%)
5 101520
LED CURRENT (mA)
Efficiency vs
LED Current
3 LEDs
4 LEDs
V
IN
=3.6V
5 LEDs
MP3204 – 6V, 1.3MHz WHITE LED DRIVER
MP3204 Rev. 1.4 www.MonolithicPower.com 2
10/8/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
TM
PACKAGE REFERENCE
Part Number* Package Temperature
MP3204DJ TSOT23-6
–40°C to +85°C
*
For Tape & Reel, add suffix –Z (eg. MP3204DJ–Z)
For RoHS Compliant Packaging, add suffix –LF
(eg. MP3204DJ–LF–Z)
ABSOLUTE MAXIMUM RATINGS
(1)
SW, OV Pins ............................... –0.5V to +28V
All Other Pins..............................
–0.3V to +6.5V
Storage Temperature ..............
–55°C to +150°C
Recommended Operating Conditions
(2)
IN Supply Voltage.............................. 2.5V to 6V
Output Voltage....................................V
IN
to 21V
Operating Temperature .............
–40°C to +85°C
Thermal Resistance
(3)
θ
JA
θ
JC
TSOT23-6.............................. 220 .... 110.. °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
3) Measured on approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS
V
IN
= V
EN
= 5V, T
A
= +25°C, unless otherwise noted.
Parameters Symbol Condition Min Typ Max Units
Operating Input Voltage V
IN
2.5 6 V
Supply Current (Shutdown) V
EN
= 0V 0.1 1 µA
Supply Current (Quiescent) V
FB
= 0.15V 690 750 µA
Switching Frequency f
SW
1.0 1.3 1.5 MHz
Maximum Duty Cycle V
FB
= 0V 85 92 %
Under Voltage Lockout
IN Under Voltage Lockout UVLO V
IN
Rising 2.25 2.45 V
Under Voltage Lockout
Hysteresis
92 mV
Open Lamp Shutdown
Threshold
V
OV
V
OV
Rising 28 V
Enable
EN Threshold V
EN
Rising 1.0 1.35 1.6 V
EN Threshold V
EN
Rising, V
IN
= 2.5V 0.8 V
EN Hysteresis 90 mV
EN Input Bias Current V
EN
= 0V, 5V 1
μA
Feedback
FB Voltage 94 104 114 mV
FB Input Bias Current V
FB
= 0.1V –600 –300 nA
Output Switch
SW On-Resistance
(4)
R
ON
0.5 Ω
SW Current Limit Duty Cycle = 60% 350 mA
Thermal Shutdown
(4)
160
°C
Note:
4) Guaranteed by design, not tested.
SW
GND
FB
1
2
3
6
5
4
IN
OV
EN
TOP VIEW
MP3204 – 6V, 1.3MHz WHITE LED DRIVER
MP3204 Rev. 1.4 www.MonolithicPower.com 3
10/8/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
TM
PIN FUNCTIONS
Pin # Name Description
1 SW
Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power
inductor and output rectifier to SW. SW can swing between GND and 25V.
2 GND Ground.
3 FB
Feedback Input. The MP3204 regulates the voltage across the current sense resistor between
FB and GND. Connect a current sense resistor from the bottom of the LED string to GND.
Connect the bottom of the LED string to FB. The regulation voltage is 104mV.
4 EN
Regulator On/Off Control Input. A high input at EN turns on the converter, and a low input turns
it off. When not used, connect EN to the input source for automatic startup. The EN pin cannot
be left floating.
5 OV
Over Voltage Input. OV measures the output voltage for open circuit protection. Connect OV to
the output at the top of the LED string.
6 IN Input Supply. This pin must be locally bypassed.
OPERATION
The MP3204 uses constant frequency, peak
current mode boost regulator architecture to
regulate a series of white LEDs. The operation
of the MP3204 can be understood by referring
to the block diagram of Figure 1. At the start of
each oscillator cycle the FET is turned on
through the control circuitry. To prevent sub-
harmonic oscillations at duty cycles greater
than 50%, a stabilizing ramp is added to the
output of the current sense amplifier and the
result is fed into the positive input of the PWM
comparator. When this voltage equals the
output voltage of the error amplifier, the power
FET is turned off. The voltage at the output of
the error amplifier is an amplified version of the
difference between the 104mV reference
voltage and the feedback voltage. This is the
manner in which the peak current level keeps
the output in regulation. If the feedback voltage
begins to drop, the output of the error amplifier
increases. This results in more current flowing
through the power FET, thus increasing the
power delivered to the output.
PWM
COMPARATOR
AMPLIFIER
CONTROL
LOGIC
CURRENT
SENSE
AMPLIFIER
SW
M1
GND
-
+
FB
1.3MHz
OSC
-
+
+
-
+
104mV
2
1
3
Figure 1—Functional Block Diagram
P1-P3P4-P6P7-P7

MP3204DJ-LF-Z

Mfr. #:
Buy MP3204DJ-LF-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
LED Lighting Drivers 5 LED 2.5-6Vin Swtch Drvr w/Open protect
Lifecycle:
New from this manufacturer.
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