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PDF CAT4238 Data sheet ( Hoja de datos )
| Número de pieza | CAT4238 | |
| Descripción | High Efficiency 10 LED Boost Converter | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT4238 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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CAT4238
High Efficiency 10 LED
Boost Converter
Description
The CAT4238 is a DC/DC step−up 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. LED currents up to 40 mA can be supported over a wide range of
input supply voltages up to 5.5 V, making the device ideal for
battery−powered applications. The CAT4238 high−voltage output
stage is perfect for driving mid−size 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 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 (1 mm
max height) 5−lead thin SOT23 package for space critical
applications.
Features
• Drives High Voltage LED Strings (38 V)
• Up to 87% Efficiency
• Low Quiescent Ground Current 0.6 mA
• Adjustable Output Current
• 1 MHz Fixed Frequency Low Noise Operation
• Soft Start “In−rush” Current Limiting
• Shutdown Current Less than 1 mA
• Open LED Overvoltage Protection
• Automatic Shutdown at 1.9 V (UVLO)
• Thermal Overload Protection
• Thin SOT23 5−lead (1 mm Max Height)
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• GPS Navigation Systems
• Portable Media Players
• Handheld Devices, Digital Cameras
• Portable Game Machines
www.onsemi.com
5
1
TSOT−23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
SW VIN
GND
FB SHDN
(Top View)
MARKING DIAGRAM
MUYM
MU = Specific Device Code
Y = Production Year (Last Digit)
M = Production Month
(1−9 (Jan−Sep), O, N, D (Oct−Dec))
ORDERING INFORMATION
Device
CAT4238TD−GT3
Package
TSOT−23
(Pb−Free)
Green*
Shipping
3,000/
Tape & Reel
* Lead Finish NiPdAu
© Semiconductor Components Industries, LLC, 2016
April, 2016 − Rev. 5
1
Publication Order Number:
CAT4238/D
1 page  
CAT4238
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, CIN = 4.7 mF, COUT = 0.22 mF, L = 47 mH with 10 LEDs at 20 mA, TAMB = 25°C, unless otherwise specified.)
150 2.0
VFB = 0.4 V
125 1.5
100 1.0
75 0.5
50
3.0
303
3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
Figure 4. Quiescent Current vs. VIN
(Not Switching)
302
5.5
301
300
299
298
297
−50
0
50 100 150
TEMPERATURE (°C)
Figure 6. FB Pin Voltage vs. Temperature
0
3.0
310
3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
Figure 5. Quiescent Current vs. VIN
(Switching)
5.5
305
300
295
10 LEDs
290
5 10 15 20 25 30
OUTPUT CURRENT (mA)
Figure 7. FB Pin Voltage vs. Output Current
1.2
SW
1.1 20V/div
Inductor
1.0 Current
100mA/div
0.9
VOUT
AC coupled
500mV/div
0.8
3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Figure 8. Switching Frequency vs. Supply
Voltage
500 ns/div
Figure 9. Switching Waveforms
www.onsemi.com
5
5 Page 
D
e
TOP VIEW
CAT4238
PACKAGE DIMENSIONS
TSOT−23, 5 LEAD
CASE 419AE
ISSUE O
E1 E
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 A1
SIDE VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-193.
q
L
L1
END VIEW
c L2
www.onsemi.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet CAT4238.PDF ] | |
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