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MP3205DJ-LF-Z

P1-P3P4-P6
MP3205
1.3MHz Fixed Frequency
5 White LED Driver
MP3205 Rev. 1.3 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 MP3205 is a step-up converter designed
for driving up to 5 series white LEDs from a
single cell Lithium Ion battery. The MP3205
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 MP3205 includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload. The MP3205 is available in a small
5-pin TSOT23 package.
EVALUATION BOARD REFERENCE
Board Number Dimensions
EV3205DJ-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
• Available in a TSOT23-5 Package
APPLICATIONS
• Cell Phones
• Handheld Computers and PDAs
• Digital Still Cameras
• Small LCD Displays Application
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
MP3205
V
IN
5V
LED1
LED2
LED3
LED4
LED5
EN
MP3205-TAC-S01
CMDSH-3
FB
3
SWIN
15
EN
GND
4
2
88
87
86
85
84
83
82
81
80
79
78
77
EFFICIENCY (%)
5 101520
LED CURRENT (mA)
MP3205-EC01
Efficiency vs
LED Current
3 LEDs
4 LEDs
V
IN
=3.6V
5 LEDs
MP3205 – 1.3 MHz FIXED FREQUENCY 5 WHITE LED DRIVER
MP3205 Rev. 1.3 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
MP3205DJ TSOT23-5
–40°C to +85°C
*
For Tape & Reel, add suffix –Z (eg. MP3205DJ–Z)
For Lead Free, add suffix –LF (eg. MP3205DJ –LF–Z)
ABSOLUTE MAXIMUM RATINGS
(1)
SW ............................................... –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
TSOT23-5.............................. 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.
Parameter Symbol Condition Min Typ Max Units
Using Parameter Set Heading
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 %
Undervoltage Lockout
IN Under Voltage Lockout UVLO V
IN
Rising 2.25 2.45 V
Under Voltage Lockout
Hysteresis
92 mV
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.
SW
GND
FB
1
2
3
5
4
IN
EN
MP3205-PD01_TSOT23
TOP VIEW
MP3205 – 1.3 MHz FIXED FREQUENCY 5 WHITE LED DRIVER
MP3205 Rev. 1.3 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 MP3205 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 IN Input Supply Pin. Must be locally bypassed.
OPERATION
The MP3205 uses a constant frequency, peak
current mode boost regulator architecture to
regulate the series string of white LEDs. The
operation of the MP3205 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
percent, 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. In this way the peak current level keeps
the output in regulation. If the feedback voltage
starts to drop, the output of the error amplifier
increases. This results in more current to flow
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
MP3205-F03-BD01
Figure 1—Functional Block Diagram
P1-P3P4-P6

MP3205DJ-LF-Z

Mfr. #:
Buy MP3205DJ-LF-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
LED Lighting Drivers 5 LED 2.5-6Vin Swtch Drvr
Lifecycle:
New from this manufacturer.
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