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PT4110 Datasheet Preview

PT4110 Datasheet

High Efficiency White LED Driver

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PT4110
High Efficiency White LED Driver
GENERAL DESCRIPTION
The PT4110 is a high efficiency step-up DC/DC
converter designed for driving multiple strings of up to
eight series-connected white LED from a single cell
Lithium Ion battery. It regulates the output current,
ideal for driving light emitting diodes (LED) whose
light intensity is proportional to the current passing
through them. The external ballast resistor sets the LED
current ranging from 5mA to 20mA, which can be
easily adjusted using either a DC voltage or a pulse
width modulated (PWM) signal alternatively. Its low
300mV feedback voltage reduces power loss and
improves efficiency.
The PT4110 has multiple features to protect itself from
fault conditions including built-in open load protection,
cycle-by-cycle current limit, over temperature
shutdown, input under voltage control and integrated
soft-start.
The PT4110 is available in SOT-89-5 and SOP-8
packages.
FEATURES
z 2.7V to 5.5V Input Voltage Range
z 35V Maximum Step-Up Voltage
z <1µA Shutdown Mode
z 1.2MHz Fixed Frequency Operation
z Cycle-By-Cycle Current Limit
z Open Load Protection
z Under Voltage Lockout
z Integrated Soft-Start
z Thermal Shutdown
z Frequency Jittering for better EMI performance
z SOT89-5 or SOP8 package
APPLICATIONS
z White LED Power Suppliers
z Flat Screen LCD Bias Suppliers
z Portable Media Players
z GPSs
z General middle-sized LCD backlight
ORDERING INFORMATION
PACKAGE
TEMPERATURE ORDERING PART
RANGE
NUMBER
SOT89-5, Pb free
-40to 85
PT4110E89E
SOP8, Pb free
-40to 85
PT4110ESOP
Note:
xxxxxX
Assembly Factory Code
Lot Number
TRANSPORT
MEDIA
Tape and Reel
Tape and Reel
MARKING
PT4110
xxxxxX
PT4110
xxxxxX
TYPICAL APPLICATION CIRCUIT
China Resources Powtech (Shanghai) Limited
PT4110_DS Rev EN_1.3
WWW.CRPOWTECH.COM
Page 1




Powtech

PT4110 Datasheet Preview

PT4110 Datasheet

High Efficiency White LED Driver

No Preview Available !

PIN ASSIGNMENT
PT4110
High Efficiency White LED Driver
PIN DESCRIPTIONS
PIN NUMBER
SOT89-5 SOP8
11
22
33
46
58
EP
2, 4, 5
PIN
NAME
IN
GND
EN
FB
SW
Exposed
PAD
NC
PIN DESCRIPTION
Input Supply Pin. Must be locally bypassed.
Signal and power ground. Connect directly to ground plane.
Enable input pin with 500kohmn pull-down resister. The voltage applied to this pin
should be either less than 0.4V or more than 1.5V to turn off and on the device
respectively. The EN pin can also be used for PWM dimming control. The PWM
square wave applied to this pin must be within the range from 100Hz to 100kHz.
Feedback Input. The PT4110 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 300mV.
Switch Output. SW is the drain of the internal N-Channel MOSFET switch. Connect
the power inductor between SW and the input source, and connect the output
rectifier between SW and the output to form the step-up converter.
Only for SOT89-5. Internally connected to GND. Mount on board for lower thermal
resistance.
Not connection
ABSOLUTE MAXIMUM RATINGS(note1)
SYMBOL
VIN
SW
All Other Pins
θJA-SOT89-5
θJA-SOP-8
PDMAX
TJ
TSTG
ITEMS
Supply Voltage
Drain of the internal power switch
Thermal resistance for SOT89-5
Thermal resistance for SOP-8
Power Dissipation SOT89-5(Note 2)
Operation Junction Temperature Range
Storage Temperature
ESD Susceptibility (Note 3)
VALUE
-0.3~7
-0.3~40
-0.3~7
65
105
1
-40 to 125
-55 to 150
2
UNIT
V
V
V
/W
/W
W
oC
oC
kV
China Resources Powtech (Shanghai) Limited
PT4110_DS Rev EN_1.3
WWW.CRPOWTECH.COM
Page 2


Part Number PT4110
Description High Efficiency White LED Driver
Maker Powtech
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PT4110 Datasheet PDF






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