w h i t e l e d d r i v e r s
CAT4237
High Voltage CMOS Boost White LED Driver
Features
D1
V
OUT
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■
■
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■
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drives 8 white LEDs in series from 3V
low quiescent ground current 0.3mA
power efficiency over 84%
VIN
3V to 4.2V
L
SW
C1
VIN
adjustable output current (up to 40mA)
high-frequency 1MHz operation
high voltage power switch
CAT4237
White
LEDs
20mA
shutdown current less than 1 µA
load fault protection against open-circuits
tight line/load regulation
SHDN
V
= 300mV
FB
FB
GND
Package Information
thin SOT23 5-lead (1mm max height)
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CAT310
Automotive 10-Channel Serial Latched LED Driver
Featured Products
Features
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output drivers withstand load-dump transients up to 40V
operates over automotive temperature range:-40 to +125°C
drives 10 LEDs in parallel at 50mA per channel
V
= 14V (typical)
BATTERY
output channels can drive a combination of white or color LEDs
30mA
+
serial output allows cascading of multiple CAT310’s to drive
greater than 10 LEDs
V
BATT
-
RS
RS
RS
RS
V
BATT
■
■
operating voltage up to 17V
OUT0
V
CC
V
OUT1
OUT2
CC
+
-
simple LED pattern programming through the 10 MHz serial
interface
CAT310
C1
5V
SCLK
XLAT
BLANK
SIN
Controller
■
■
■
blank pin provides global on/off control of all LEDs
under Voltage Lockout
OUT9
SOUT
GND
PGND
over Voltage Protection
Package Information
20-lead SOIC
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E
w w w . c a t s e m i . c o m
5
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