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PT4404 Datasheet Preview

PT4404 Datasheet

Low Dropout Adjustable 350mA Current Regulator

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PT4404
Low Dropout
Adjustable 350mA Current Regulator
GENERAL DESCRIPTION
PT4404 is a low dropout current regulator with an
adjustable constant sink current sink of up to 350mA.
The dropout voltage at 350mA is typically 110mVwith
the quiescent current of only 100μA. The enable pin is
used to shutdown the chip or control the LED
brightness with a PWM signal.
The built-in thermal shutdown protection shuts down
the chip when the chip temperature exceeds 150oC. An
external resistor can be used to set the output current
level. The PT4404 is packaged with SOT-89-5.
FEATURES
z Supply voltage range: 2.7V-5.5V
z Current sink set by external resistor
z 110mV Low Dropout voltage for 350mA
current output
z 100uA quiescent current
z 0.1uA shutdown current
z Built-in thermal shutdown protection
z SOT-89-5 Package
APPLICATION
z Power LED Driver
z Constant current sink
ORDERING INFORMATION
PACKAGE
SOT-89-5
TEMPERATURE
RANGE
-40 oC to 85 oC
ORDERING PART
NUMBER
PT4404E89E
Note:
xxxxxX
Assembly Factory Code
Lot Number
TRANSPORMEDIA
Tape and Reel
1000 units
MARKING
PT4404
xxxxxX
TYPICAL APPLICATION CIRCUIT
VDD5.5V:
VDD>5.5V:
2.7~ 5.5V
V
VDD
Out
EN
Radj
GND
RADJ
91k
(IOUT= 350m )
China Resources Powtech (Shanghai) Limited
PT4404_DS Rev EN_2.2
WWW.CRPOWTECH.COM
Page1




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PT4404 Datasheet Preview

PT4404 Datasheet

Low Dropout Adjustable 350mA Current Regulator

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PIN ASSIGNMENT
5
RADJ
4
EN
Out GND VDD
123
SOT-89-5
PT4404
Low Dropout
Adjustable 350mA Current Regulator
PIN DESCRIPTIONS
SYMBOL SOT-89-5
DESCRIPTION
VDD 3 Power Supply
GND
OUT
RADJ
EN
2 Ground
1
Adjustable Sink Current
Output up to 350mA
Connecting to an External
5 Resistor for Setting Output
Current
Enable Input Logic, Enable
4 High
ABSOLUTE MAXIMUM RATINGS (Note 1)
SYMBOL
VDD
VOUT
PDMAX
PTR
TJ
TSTG
ITEMS
Supply Voltage
Out Voltage
Power Dissipation (Note 2)
Thermal Resistance, SOT-89-5
θJA
Operation Junction Temperature Range
Storage Temperature
ESD Susceptibility (Note 3)
VALUE
-0.3 to 6.5
-0.3 to 6.5
Internally Limited
45
-40 to 150
-55 to 150
2
UNIT
V
V
W
oC /W
oC
oC
kV
RECOMMENDED OPERATING RANGE
SYMBOL
VDD
TOPT
ITEMS
VDD Supply Voltage
Operating Temperature
VALUE
+2.7 to +6.0
-40 to +85
UNIT
V
oC
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Recommended
Operating Range indicates conditions for which the device is functional, but do not guarantee specific performance
limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Range. Specifications are
not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device
performance.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA,
and the ambient temperature TA. The maximum allowable power dissipation is PDMAX = (TJMAX - TA)/ θJA or the
number given in Absolute Maximum Ratings, whichever is lower.
Note 3: Human body model, 100pF discharged through a 1.5kresistor.
China Resources Powtech (Shanghai) Limited
PT4404_DS Rev EN_2.2
WWW.CRPOWTECH.COM
Page2


Part Number PT4404
Description Low Dropout Adjustable 350mA Current Regulator
Maker PowTech
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