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Número de pieza | CAT4139 | |
Descripción | 22V High Current Boost White LED Driver | |
Fabricantes | Catalyst Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de CAT4139 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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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)
1kΩ
IOUT
180mA
R1
1.62Ω
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
1 page www.DataSheet4U.com
CAT4139
TYPICAL CHARACTERISTICS
VIN = 5.0V, IOUT = 180mA, TAMB = 25ºC, with typical application circuit unless otherwise specified.
Maximum Output Current
Shutdown Voltage
300
250
VOUT = 9V
200
150
100
VOUT = 14V
50
0
3.0
3.5 4.0 4.5 5.0
INPUT VOLTAGE [V]
5.5
1.0
-25°C
0.8
-40°C
0.6
0.4
85°C
125°C
0.2
3.0
3.5 4.0 4.5
INPUT VOLTAGE [V]
5.0
Switch Current Limit
900
VOUT = 9V
850
800
VOUT = 12V
750
700
650
600
4.5
4.7 4.9 5.1 5.3
INPUT VOLTAGE [V]
5.5
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. MD-5032 Rev. A
5 Page www.DataSheet4U.com
PACKAGE OUTLINES DRAWING
TSOT-23 5-Lead (TD) (1)(2)
CAT4139
D
e
E1 E
TOP VIEW
SYMBOL
A
A1
A2
b
c
D
E
E1
e
L
L1
L2
θ
MIN
0.01
0.80
0.30
0.12
0.30
0º
NOM
0.05
0.87
0.15
2.90 BSC
2.80 BSC
1.60 BSC
0.95 TYP
0.40
0.60 REF
0.25 BSC
MAX
1.00
0.10
0.90
0.45
0.20
0.50
8º
A2 A
b
SIDE VIEW
A1
θ
L
L1
END VIEW
c L2
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC standard MO-193.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. MD-5032 Rev. A
11 Page |
Páginas | Total 13 Páginas | |
PDF Descargar | [ Datasheet CAT4139.PDF ] |
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