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PT4103 Datasheet

White LED Step-Up Converter

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PT4103
White LED Step-Up Converter
GENERAL DESCRIPTION
The PT4103 is a step-up DC/DC converter designed for
driving up to 8 white LEDs in series from a single cell
Lithium Ion battery with constant current. Because it
directly regulates output current, the PT4103 is ideal for
driving light emitting diodes (LEDs) whose light
intensity is proportional to the current passing through
them, not the voltage across their terminals. A single
external resistor sets LED current between 5mA and
20mA, which can then be easily adjusted using either a
DC voltage or a pulse width modulated (PWM) signal.
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 PT4103 is available in SOT23-6
packages.
FEATURES
z Drives Up to 5 Series White LEDs from 2.5V
z Drives Up to 8 Series White LEDs from 3.6V
z Up to 87% Efficiency
z 1.2MHz Fixed Switching Frequency
z Low 104mV Feedback Voltage
z Open Load Shutdown
z Soft Start/PWM Dimming
z SOT23-6 Packages
APPLICATIONS
z Cell Phones
z Handheld Computers and PDAs
z Digital Cameras
z Small LCD Displays
ORDERING INFORMATION
PACKAGE
SOT23-6
TEMPERATURE
RANGE
-40 oC to 85 oC
ORDERING PART
NUMBER
PT4103B23F
TRANSPORT
MEDIA
Tape and Reel
3000 units
MARKING
4103
TYPICAL APPLICATIONS
Figure1. Li-Ion Driver for Six White LEDs
KEY PERFORMANCE CHART
90.00%
85.00%
80.00%
75.00%
5
Efficiency vs n(LED)
3LED
4LED
5LED
6LED
7LED
8LED
10 15
Iout (mA)
20 25
Vin=3.6V
Figure2. Efficiency vs Number of LEDs
China Resources Powtech (Shanghai) Limited
PT4103_DS Rev EN_2.2
WWW.CRPOWTECH.COM
Page 1




Powtech

PT4103 Datasheet Preview

PT4103 Datasheet

White LED Step-Up Converter

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PIN ASSIGNMENT
PT4103
White LED Step-Up Converter
PIN DESCRIPTIONS
SOT
PIN No.
1
2
3
4
5
6
PIN
Names
SW
GND
FB
EN
OV
IN
DESCRIPTION
Power Switch Output. Connect the inductor and the blocking Schottky diode to
SW.
Ground
Feedback input pin. The reference voltage at this pin is 104mV. Connect the
cathode of the lowest LED to FB and a current sense resistor between FB and
GND.
Enable pin. A high input at EN enables the device and a low input disables the
devices. When not used, connect EN to the input source for automatic startup.
Over Voltage Input. OV measures the output voltage for open circuit protection.
Connect OV to the output at the top of the LED string.
Input Supply Pin. Must be locally bypassed.
ABSOLUTE MAXIMUM RATINGS (Note 1)
SYMBOL
VIN
VSW
VIO
PTR1
Tstg
Tsolder
ITEMS
Input Voltage
Voltage at SW Pin
All Other I/O Pins
Thermal ResistanceSOT-23-6
θJA
θJC
Storage Temperature
Package Lead Soldering Temperature
VALUE
-0.36
-0.535
GND-0.3 to VDD+0.3
220
110
-55 to 150
260, 10s
UNIT
V
V
V
/W
China Resources Powtech (Shanghai) Limited
PT4103_DS Rev EN_2.2
WWW.CRPOWTECH.COM
Page 2


Part Number PT4103
Description White LED Step-Up Converter
Maker Powtech
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PT4103 Datasheet PDF






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