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PT4101 Datasheet Preview

PT4101 Datasheet

White LED Step-Up Converter

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GENERAL DESCRIPTION
The PT4101 is a step-up DC/DC converter designed for
driving up to 5 white LEDs in series from a single cell
Lithium Ion battery with constant current. Because it
directly regulates output current, the PT4101 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 2mA and
20mA, which can then be easily adjusted using either a
DC voltage or a pulse width modulated (PWM) signal
up to 100KHz. 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 PT4101 is available in
SOT23-6 packages.
PT4101
White LED Step-Up Converter
FEATURES
z Drives Up to 5 Series White LEDs from 3V
z Up to 87% Efficiency
z 1.25MHz Fixed Switching Frequency
z Low 104mV Feedback Voltage
z Open Load Shutdown
z 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
TEMPERATURE
RANGE
ORDERING PART
NUMBER
SOT23-6
-40 oC to 85 oC
PT4101B23F
TRANSPORT
MEDIA
Tape and Reel
3000 units
MARKING
4101
TYPICAL APPLICATIONS
Figure 1. Li-Ion Driver for Four White LEDs
0.89
Vin=3.6V
0.88
0.87
0.86
0.85
0.84
0.83
0.82
0.81
0.80
2mA
5mA
10mA
Iout (mA)
2*LED
3*LED
4*LED
5*LED
15mA
20mA
Figure 2. Efficiency vs Number of LEDs
China Resources Powtech (Shanghai) Limited
PT4101_DS Rev EN_2.2
WWW.CRPOWTECH.COM
Page 1




Powtech

PT4101 Datasheet Preview

PT4101 Datasheet

White LED Step-Up Converter

No Preview Available !

PIN ASSIGNMENT
PT4101
White LED Step-Up Converter
PIN DESCRIPTION
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
PDMAX
PTR1
Tstg
Tsolder
ITEMS
Input Voltage
Voltage at SW Pin
All Other I/O Pins
Power Dissipation (Note 2)
Thermal ResistanceSOT-23-6, ΘJA
Storage Temperature
Package Lead Soldering Temperature
ESD Susceptibility (Note 3)
RECOMMANDED OPERATING RANGE (Note 1)
SYMBOL
VIN
VSW
TOPT
ITEMS
VIN Supply Voltage
Output Voltage
Operating Temperature
VALUE
-0.36
-0.525
GND-0.3 to VDD+0.3
Internally Limited
220
-55 to 150
260, 10s
3
UNIT
V
V
V
W
℃/W
kV
VALUE
3 to 5.5
VIN to 20
-40 to +85
UNIT
V
V
China Resources Powtech (Shanghai) Limited
PT4101_DS Rev EN_2.2
WWW.CRPOWTECH.COM
Page 2


Part Number PT4101
Description White LED Step-Up Converter
Maker Powtech
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PT4101 Datasheet PDF






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