CAT4139
22V High Current Boost White LED Driver
FEATURES
Switch Current Limit 750mA
Drives LED strings up to 22V
Up to 87% Efficiency
Low Quiescent Ground Current 0.6mA
1MHz Fixed Frequency Low noise Operation
Soft start “in-rush” current limiting
Shutdown current less than 1μA
Open LED Overvoltage Protection
Automatic Shutdown at 1.9V (UVLO)
Thermal overload protection
TSOT-23 5-Lead (1mm max height)
DESCRIPTION
The CAT4139 is a DC/DC step-up converter that
delivers an accurate constant current ideal for driving
LEDs. Operation at a fixed 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. The CAT4139
is ideal for driving parallel strings of up to five white
LEDs in series or up to 22V.
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 TSOT-23 package for space critical
applications.
Quantity Package
per Reel Marking
3000
TP
APPLICATIONS
GPS Navigation Systems
Portable Media Players
Handheld Devices
ORDERING INFORMATION
Part Number
Package
CAT4139TD-GT3 TSOT23-5*
* NiPdAu Plated Finish, RoHS compliant
PIN CONFIGURATION
TSOT-23 5-Lead
SW
GND
FB
1
2
3
4
SHDN
5
VIN
TYPICAL APPLICATION CIRCUIT
V
IN
5V
C1
SW
VIN
CAT4139
OFF ON
SHDN
GND
FB
(300mV)
L
22µH
C2
1µF
35V
R2
1kΩ
I
OUT
180mA
R1
1.62Ω
D
V
OUT
9 strings at
20mA
4.7µF
Top View
L: Sumida CDRH6D28-220
D: Central CMSH1-40 (rated 40V)
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-5032 Rev. A
CATALYST [ CATALYST SEMICONDUCTOR ]
