CAT4240 LED Driver Datasheet

CAT4240 Datasheet, PDF, Equivalent


Part Number

CAT4240

Description

6 Watt Boost LED Driver

Manufacture

ON Semiconductor

Total Page 12 Pages
Datasheet
Download CAT4240 Datasheet


CAT4240
CAT4240
6 Watt Boost LED Driver
Description
The CAT4240 is a DC/DC stepup converter that delivers an accurate
constant current ideal for driving LEDs. Operation at a fixed switching
frequency of 1 MHz 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
CAT4240 highvoltage output stage is perfect for driving midsize and
large panel displays containing up to ten white LEDs in series.
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 powerdown 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 (1 mm
max height) 5lead thin SOT23 package for space critical applications.
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5
1
TSOT23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
SW VIN
Features
Switch Current Limit 750 mA
Drives High Voltage LED Strings (38 V)
Up to 94% Efficiency
Low Quiescent Ground Current 0.6 mA
1 MHz Fixed Frequency Low Noise Operation
Soft Start “Inrush” Current Limiting
Shutdown Current Less than 1 mA
Open LED Overvoltage Protection
Automatic Shutdown at 1.9 V (UVLO)
Thermal Overload Protection
Thin SOT23 5lead (1 mm Max Height)
These Devices are PbFree, Halogen Free/BFR Free and are RoHS
Compliant
Applications
GPS Navigation Systems
Portable Media Players
Handheld Devices, Digital Cameras
GND
FB
(Top View)
SHDN
MARKING DIAGRAM
TGYM
TG = Specific Device Code
Y = Production Year (Last Digit)
M = Production Month (19, A, B, C)
ORDERING INFORMATION
Device
CAT4240TDGT3
Package
TSOT23
(PbFree)
Green*
Shipping
3,000/
Tape & Reel
* NiPdAu Plated Finish
VL L1 D1 VOUT
8 V to
16 V
C1
VIN
5 V C3
47 mH
C2
4.7 mF/16 V
SW 1 μF/50 V
VIN
CAT4240
1 μF
SHDN
(300 mV) R2
FB
GND
1 kW
L1: Sumida CDRH6D28470
D1: Central CMSH140 (rated 40 V)
300 mA
R1
1W
Figure 1. Typical Application Circuit
© Semiconductor Components Industries, LLC, 2010
February, 2010 Rev. 3
1
Publication Order Number:
CAT4240/D

CAT4240
CAT4240
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters
Ratings
Units
VIN, FB voltage
SHDN voltage
0.3 to +7
0.3 to +7
V
V
SW voltage
0.3 to 60
V
Storage Temperature Range
65 to +160
_C
Junction Temperature Range
40 to +150
_C
Lead Temperature
300 _C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameters
Range
VIN
SW pin voltage
up to 5.5
0 to 38
Ambient Temperature Range (Note 1)
40 to +85
NOTE: Typical application circuit with external components is shown on page 1.
1. Thin SOT235 package thermal resistance qJA = 135°C/W when mounted on board over a ground plane.
Units
V
V
_C
Table 3. DC ELECTRICAL CHARACTERISTICS
(VIN = 3.6 V, ambient temperature of 25°C (over recommended operating conditions unless otherwise specified))
Symbol
Parameter
Test Conditions
Min Typ
IQ Operating Current
VFB = 0.2 V
VFB = 0.4 V (not switching)
0.6
0.1
ISD Shutdown Current
VFB FB Pin Voltage
IFB FB pin input leakage
ILED Programmed LED Current
VSHDN = 0 V
6 LEDs with ILED = 75 mA
R1 = 10 W
R1 = 5 W
0.1
285 300
28.5 30
60
VIH SHDN Logic High
VIL SHDN Logic Low
Enable Threshold Level
Shutdown Threshold Level
0.8
0.4 0.7
FSW
DC
ILIM
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
VIN = 3 V
VIN = 3.6 V
VIN = 5 V
0.8 1.0
92
600
750
RSW
ILEAK
Switch “On” Resistance
Switch Leakage Current
Thermal Shutdown
ISW = 100 mA
Switch Off, VSW = 30 V
1.0
2
150
Thermal Hysteresis
20
VUVLO
VOV-SW
VOCL
Undervoltage Lockout (UVLO) Threshold
Overvoltage Detection Threshold
Output Voltage Clamp
“Open LED”
1.9
40
42
Max Units
1.5 mA
0.6
1 mA
315 mV
1 mA
31.5 mA
1.5 V
1.3 MHz
%
mA
2.0 W
5 mA
°C
°C
V
V
V
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2


Features CAT4240 6 Watt Boost LED Driver Descri ption The CAT4240 is a DC/DC step−up converter that delivers an accurate con stant current ideal for driving LEDs. O peration at a fixed switching frequency of 1 MHz allows the device to be used with small value external ceramic capac itors and inductor. LEDs connected in s eries are driven with a regulated curre nt set by the external resistor R1. The CAT4240 high−voltage output stage is perfect for driving mid−size and lar ge panel displays containing up to ten white LEDs in series. LED dimming can b e done by using a DC voltage, a logic s ignal, or a pulse width modulation (PWM ) signal. The shutdown input pin allows the device to be placed in power−dow n mode with “zero” quiescent curren t. In addition to thermal protection an d overload current limiting, the device also enters a very low power operating mode during “Open LED” fault condi tions. The device is housed in a low pr ofile (1 mm max height) 5−lead thin SOT23 package for space critical applicatio.
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