AP2803升压恒流1-3w手电筒IC
Features
LED Power Efficiency: up to 90%
Current Accuracy: 5%(V =3.6V to 1.8V
± IN
@v =3.7V)
F
1MHz Switching Frequenc
Uses small, Low Profile External Components
Low RDS(ON) : 100mΩ (TYP.)
Over Temperature Protec
tion
Low Profile SOT-23-6 Package
Pb-Free Package
± IN
F
Low Start-Up Voltage: 0.9V(I =270mA)
LED
Low Hold Voltage:0.75V(I =200mA)
LED
White LED Torch (Flashlight)
White LED Camera Flash
DSC(Digital Still Camera)Flash
Cellular Camera Phone Flash
PDA Camera Flash
Camcorder Torch(Flashlight) Lamp
The AP2803 is a set-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.
TheAP2803 is targeted to be used for driving loads
up to 1A from a two-cell alkaline battery. 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, 100
device can provide high efficiency even at heavy load. During the shutdown mode, the feedback resistor Rs and the load are completely disconnected and the current consumption is reduced to less than 1uA.
LED
LED
Applications
General Description
mΩ NMOS switch, the
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