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Power Analog Micoelectronics

PAM2801 Datasheet Preview

PAM2801 Datasheet

1W High Power White LED Driver

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PAM2801
1W High Power White LED Driver
Features
General Description
n LED Power Efficiency: up to 90%
n LED Current Accuracy:±3%(V =IN 3.2V to 1.1V
@VF=3.4V)
n Low Start-Up Voltage: 0.9V(I =LED 243mA)
n Low Hold Voltage:0.65V(ILED=95mA)
n Internal 2A MOSFET Switch
n 1.0MHz Switching Frequency
n Uses Small,Low Profile External Components
n Low R :DS(ON) 100mΩ (TYP.)
n Open LED Protection
n Over Temperature Protection
n Low Profile SOT-23 Package
n Pb-Free Package
Applications
n White LED Torch (Flashlight)
n White LED Camera Flash
n DSC(Digital Still Camera)Flash
n Cellular Camera Phone Flash
n PDA Camera Flash
n Camcorder Torch(Flashlight) Lamp
The PAM2801 is a step-up DC-DC converter that
delivers a regulated output current. The device
switches at a 1.0MHz constant frequency,
allowing for the use of small value external
inductor and ceramic capacitors.
The PAM2801 is targeted to be used for driving
1W white LED from a 0.9V to 3.2V input. The LED
current can be programmed by the external
current sense resistor, Rs, connected between the
feedback pin (FB) and ground. A low 95mV
feedback voltage reduces the power loss in the Rs
for better efficiency. With its internal 2A, 100mΩ
NMOS switch, the device can provide high
efficiency even at heavy load.
LED dimming can be done by using a DC voltage
applied to the FB pin and a pulse width modulation
(PWM) signal applied to the FB pin or SHDN pin.
During the shutdown mode, the feedback resistor
Rs and the load are completely disconnected and
the current consumption is reduced to less than
1uA.
The PAM2801 is available in the 6-lead SOT-23-6
package.
Typical Application
2.2uH
www.DataSheet4U.com
1
SW
6 VIN VOUT 5
CIN PAM2801
VIN 10uF
SHDN FB 3
OFF ON 4
GND
2
1W
WLED
CO
RS 10uF
ILED=350mA,RS=0.27Ω
Block Diagram
95mV
Reference
+
A1
-
FB
VOUT VIN
Comparator
-
Rc A2
+
Cc
PWM Logic
And Driver
Σ
Ramp
Generator
SW
+
-
SHDN Shutdown
And
Soft-start
1.0MHz
Oscillator
GND
Power Analog Microelectronics,Inc
www.poweranalog.com
1
08/2007




Power Analog Micoelectronics

PAM2801 Datasheet Preview

PAM2801 Datasheet

1W High Power White LED Driver

No Preview Available !

PAM2801
1W High Power White LED Driver
Pin Configuration& Marking Information
Top View
SOT-23-6
65 4
XX V Y W
XX: Product Code
V: Voltage Code
Y: Year
W: Weekly
12 3
Pin Number
1
2
3
4
5
6
Name
SW
GND
FB
SHDN
VOUT
VIN
Function
Switch
Ground
Feedback
Shut Down
Output
Input
Absolute Maximum Ratings
These are stress ratings only and functional operation is not implied. Exposure to absolute
maximum ratings for prolonged time periods may affect device reliability. All voltages are with
respect to ground.
Input Pin Voltage...............................–0.3V to 6V
SW Pin Voltage..................................–0.3V to 6V
SHDN, FB Pin Voltage.........................–0.3V to 6V
Operating Temperature Range .........-40°C to 85°C
Storage Temperature Range......... –65°C to 125°C
Lead Temperature (Soldering, 5 sec) ...........300°C
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Recommended Operating Conditions
Junction Temperature...............-40°C to 125°C Ambient Temperature..................-40°C to 85°C
Thermal Information
Parameter
Thermal Resistance
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Internal Power Dissipation
Package
SOT-23-6
SOT-23-6
SOT-23-6
Symbol
θJC
θJA
PD
Maximum
130
250
400
Unit
/W
mW
Power Analog Microelectronics,Inc
www.poweranalog.com
2
08/2007


Part Number PAM2801
Description 1W High Power White LED Driver
Maker Power Analog Micoelectronics
Total Page 9 Pages
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