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CAT4237TS

Description
High Voltage CMOS Boost White LED Driver
CategoryAnalog mixed-signal IC    Drivers and interfaces   
File Size378KB,13 Pages
ManufacturerCatalyst
Websitehttp://www.catalyst-semiconductor.com/
Download Datasheet Parametric View All

CAT4237TS Overview

High Voltage CMOS Boost White LED Driver

CAT4237TS Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
Parts packaging codeSOT-23
package instructionVSSOP, TSOP5/6,.11,37
Contacts5
Reach Compliance Codeunknow
ECCN codeEAR99
Interface integrated circuit typeLED DISPLAY DRIVER
JESD-30 codeR-PDSO-G5
JESD-609 codee0
length2.9 mm
Humidity sensitivity level1
Number of functions1
Number of segments1
Number of terminals5
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeVSSOP
Encapsulate equivalent codeTSOP5/6,.11,37
Package shapeRECTANGULAR
Package formSMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)240
power supply3.6 V
Certification statusNot Qualified
Maximum seat height1 mm
Maximum supply voltage5.5 V
Minimum supply voltage2.8 V
Nominal supply voltage3.6 V
surface mountYES
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.95 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width1.625 mm
Base Number Matches1
CAT4237
High Voltage CMOS Boost White LED Driver
Features
Drives 6 to 8 White LEDs in series from 3V
Up to 87% Efficiency
Low Quiescent Ground Current 0.6mA
Adjustable Output Current (up to 40mA)
High Frequency 1MHz Operation
High Voltage Power Switch
Shutdown current less than 1µA
Open LED low power mode
Automatic Shutdown at 1.9V (UVLO)
Thermal shutdown protection
Thin SOT23 5-Lead (1mm max height)
Product Description
The CAT4237 is a DC/DC step-up converter that
delivers an accurate constant current ideal for
driving LEDs. Operation at a constant switching
frequency of 1MHz allows the device to be used
with small value external ceramic capacitors and
inductor. LEDs connected in series are driven
with a regulated current set by the external
resistor R1. LED currents up to 40mA can be
supported over a wide range of input supply
voltages from 2.8V to 5.5V, making the device
ideal for battery-powered applications. The
CAT4237 high-voltage output stage is perfect for
driving six, seven or eight white LEDs in series
with inherent current matching in LCD backlight
applications.
LED dimming can be done by using a DC
voltage, a logic signal, or a pulse width
modulation (PWM) signal. The shutdown input
pin allows the device to be placed in power-down
mode with “zero” quiescent current.
In addition to thermal protection and overload
current limiting, the device also enters a very low
power operating mode during “Open LED” fault
conditions. The device is housed in a low profile
(1mm max height) 5-lead thin SOT23 package for
space critical applications.
Applications
Color LCD and keypad Backlighting
Cellular Phones
Handheld Devices
Digital Cameras
PDAs
Portable Game Machine
Ordering Information
Part
Number
CAT4237TS
CAT4237TD
Package
Quantity
per Reel
3000
3000
Package
Marking
LS
LT
TSOT23-5
TSOT23-5
1
Lead Free
Note 1: NiPdAu Lead Plating
Pin Configuration
Top View
Typical Application Circuit
5-Lead Thin SOT23
1mm max height
L: Sumida CDRH3D16-330
D: Central CMDSH05-4 (rated 40V)
C2: Taiyo Yuden UMK212BJ224 (rated 50V)
© 2005 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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