pt4108 China Resources Powtech (Shanghai) Co., Ltd, pt4108 Datasheet
pt4108
Manufacturer Part Number
pt4108
Description
High Efficiency Boost High Brightness Led Driver
Manufacturer
China Resources Powtech (Shanghai) Co., Ltd
Datasheet
1.PT4108.pdf
(2 pages)
FEATURES
APPLICATION
PT4108-EN-BRIEF
www.crpowtech.com
Low Quiescent (Switch-off) Supply Current:
25µA
High Supply Capability: Drive 3W LED with
lithium cell or 2Alkaline Cell
Zero Shutdown Mode Supply Current
High efficiency up to 90%
Fixed switching frequency: 500KHz
Options for internal or external power
switches
MSOP-8 and SOT-89-5 packages are
available
Portable lighting
Rechargeable Flashlights
High Efficiency Boost High Brightness LED Driver
Copyright © 2007, Crpowtech (Shanghai) co.,Ltd.
GENERAL DESCRIPTION
The PT4108 is a compact, high efficiency, and
low voltage step-up high brightness LED Driver
with an Adaptive Current Mode PWM control
loop. It comprises of an error amplifier, a ramp
generator, a PWM comparator, a switch pass
element and driver. It provides stable and high
efficient operation over a wide range of load
currents.
compensated to minimize component size. It
provides a constant current drive for 3W LED
with 2 Alkaline Cells or 1 lithium cell. It limits the
output voltage to 5V if the output load is
disconnected. The 500KHz high switching rate
reduces the size of external components.
Besides, the 25µA low quiescent current
together with high efficiency maintains long
battery lifetime. The LED current is set with one
external resistors.
The
feedback
loop
is
PT4108
internally
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pt4108 Summary of contents
Page 1
... APPLICATION Portable lighting Rechargeable Flashlights PT4108-EN-BRIEF GENERAL DESCRIPTION The PT4108 is a compact, high efficiency, and low voltage step-up high brightness LED Driver with an Adaptive Current Mode PWM control loop. It comprises of an error amplifier, a ramp generator, a PWM comparator, a switch pass element and driver. It provides stable and high efficient operation over a wide range of load currents ...
Page 2
... TYPICAL APPLICATIONS PT4108-EN-BRIEF Copyright © 2007, Crpowtech (Shanghai) co.,Ltd. PT4108 ...