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CAT4139 Schematic ( PDF Datasheet ) - Catalyst Semiconductor

Teilenummer CAT4139
Beschreibung 22V High Current Boost White LED Driver
Hersteller Catalyst Semiconductor
Logo Catalyst Semiconductor Logo 




Gesamt 13 Seiten
CAT4139 Datasheet, Funktion
www.DataSheet4U.com
22V High Current Boost White LED Driver
CAT4139
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)
APPLICATIONS
„ GPS Navigation Systems
„ Portable Media Players
„ Handheld Devices
ORDERING INFORMATION
Part Number
Package
Quantity Package
per Reel Marking
CAT4139TD-GT3 TSOT23-5* 3000
TP
* NiPdAu Plated Finish, RoHS compliant
For Ordering Information details, see page 12.
PIN CONFIGURATION
TSOT-23 5-Lead
SW 1
GND 2
FB 3
5 VIN
4 SHDN
Top View
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.
TYPICAL APPLICATION CIRCUIT
VIN
L
D
9 strings at
VOUT
20mA
5V
C1
22µH
C2
4.7µF
OFF ON
SW 1µF
VIN 35V
CAT4139
R2
SHDN
GND
FB
(300mV)
1k
IOUT
180mA
R1
1.62
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






CAT4139 Datasheet, Funktion
CAT4139
www.DataSheet4U.com
PIN DESCRIPTION
VIN is the supply input for the internal logic. The
device is compatible with supply voltages down to
2.8V and up to 5.5V. It is recommended that a small
bypass ceramic capacitor (4.7μF) be placed between
the VIN and GND pins near the device. If the supply
voltage drops below 1.9V, the device stops switching.
S¯¯H¯D¯N¯ is the shutdown logic input. When the pin is
tied to a voltage lower than 0.4V, the device is in
shutdown mode, drawing nearly zero current. When
the pin is connected to a voltage higher than 1.5V, the
device is enabled.
GND is the ground reference pin. This pin should be
connected directly to the ground plane on the PCB.
SW pin is connected to the drain of the internal CMOS
power switch of the boost converter. The inductor and
the Schottky diode anode should be connected to the
SW pin. Traces going to the SW pin should be as
short as possible with minimum loop area. An over-
voltage detection circuit is connected to the SW pin.
When the voltage reaches 24V, the device enters a
low power operating mode preventing the SW voltage
from exceeding the maximum rating.
FB feedback pin is regulated at 0.3V. A resistor con-
nected between the FB pin and ground sets the LED
current according to the formula:
ILED = 0.3V / R1
The lower LED cathode is connected to the FB pin.
Pin #
1
2
3
4
5
Name
SW
GND
FB
S¯¯H¯D¯N¯
VIN
Function
Switch pin. This is the drain of the internal power switch.
Ground pin. Connect the pin to the ground plane.
Feedback pin. Connect to the last LED cathode.
Shutdown pin (Logic Low). Set high to enable the driver.
Power Supply input.
SIMPLIFIED BLOCK DIAGRAM
VIN
C1
Ref
300mV
+
VIN
SHDN
Thermal
Shutdown
& UVLO
1MHz
Oscillator
+
Current
Sense
SW
Over Voltage
Protection
PWM
&
Logic
Driver
VOUT
C2
ILED
RS
GND
FB
Doc. No. MD-5032 Rev. A
6 © Catalyst Semiconductor, Inc.
Characteristics subject to change without notice

6 Page









CAT4139 pdf, datenblatt
www.DataSheet4U.com
EXAMPLE OF ORDERING INFORMATION1
Prefix
CAT
Device #
4139
Suffix
TD
G
Product Number
4139
Optional
Company ID
Package
TD: TSOT-23
Lead Finish
G: NiPdAu
CAT4139
T3
Tape & Reel
T: Tape & Reel
3: 3000/Reel
SERIES LED DRIVERS
Part Number
Description
CAT4137
CMOS Boost Converter – White LED Driver
CAT4237
High Voltage CMOS Boost White LED Driver
CAT4238
High Efficiency 10 LED Boost Converter
CAT4139
22V High Current Boost White LED Driver
CAT4240
6 Watt Boost LED Driver
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead finish is NiPdAu.
(3) The device used in the above example is a CAT4139–GT3 (TSOT-23, NiPdAu, Tape & Reel).
(4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
12
Doc. No. MD-5032 Rev. A

12 Page





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