ST
Sitronix
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Features
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High Efficiency Operation ( P
LEDs
/ P
BATT
)
-- Extends battery life
-- Peak efficiency over 88 %
1 / 1.5x Fractional Charge Pump Circuits
-- extends voltage operate range
Range of LED Driver Power
-- 2.7 to 5.0V
Drivability 30 mA/LED with Li-Ion Battery
Operating Range
Shutdown Mode Draws Less Than 1 uA
Regulated to ± 3 % Output Current Matching
Soft-Start Function To Limit Inrush Current
Dimming Control by Logic or PWM
No external Schottky Diode and Inductor
Required
Low Input Ripple and EMI
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ST1208
3-Channel White LED Driver
Short Circuit and Over-Temperature Protection
2KV ESD Rating
Thin QFN ( 4 mm X 4 mm ), Small TSSOP-16L
Packages and Bare Chip
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Ordering Information
Ordering No.
ST1208-Q
ST1208-T
ST1208-B
Package
QFN-16
TSSOP-16L
Bare Chip
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Description
The ST1208 is a versatile change pump designed
for use in battery operated power supply application.
The wide input range is matched for Li-Ion battery
applications.
The ST1208 LED drivers feature a fractional
change pump implementation with efficiency
comparable to a switching regulator without costly
inductors. Only four tiny ceramic capacitors are
required, and no external inductor is required for
operation that provides a reduced-EMI solution.
Proprietary low noise mode switching circuit and
constant output current allow the use of extremely
small input and output capacitor.
The ST1208 contains a thermal management circuit to
protect the device under continuous output short circuit
condition.
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Applications
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Cellular phones
PDAs
Portable communication devices
LED/Display backlight driver
Digital Cameras
Handheld Electronics
Flash LED driver
V1.1
1/12
2004/10/27
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
