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PDF CAT4137 Data sheet ( Hoja de datos )
| Número de pieza | CAT4137 | |
| Descripción | CMOS Boost Converter - White LED Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT4137 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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CAT4137
CMOS Boost Converter -
White LED Driver
Description
The CAT4137 is a DC/DC step-up converter that delivers a
regulated output current. Operation at a constant switching frequency
of 1 MHz allows the device to be used with small value external
ceramic capacitors and inductor.
The device drives a string of white LEDs connected in series and
provides the regulated current to control the LEDs with inherent
uniform brightness and matching. An external resistor R1 sets the
output current and allows up to 30 mA current to be supported over a
wide range of input supply voltages from 2.2 V to 5.5 V, making the
device ideal for battery-powered applications.
LED dimming can be done by using a DC voltage, a logic signal, or
a pulse width modulation (PWM) signal. The shutdown control 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 up to 5 White LEDs from 3 V
• Power Efficiency up to 87%
• Low Quiescent Ground Current 0.1 mA
• Adjustable Output Current (up to 30 mA)
• High Frequency 1 MHz Operation
• “Zero” Current Shutdown Mode
• Operates Down to 2 V (from Two AA Batteries)
• Soft Start Power-up
• Open LED Low Power Mode
• Automatic Shutdown at 1.9 V (UVLO)
• Thermal Shutdown Protection
• Thin SOT23 5−lead (1 mm Max Height)
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• LCD Backlighting
• Cellular Phones
• Handheld Devices
• Digital Cameras
http://onsemi.com
5
1
TSOT−23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
SW VIN
GND
FB SHDN
(Top View)
MARKING DIAGRAMS
LXYM
UEYM
LX = CAT4137TD−T3
UE = CAT4137TD−GT3
Y = Production Year (Last Digit)
M = Production Month (1−9, A, B, C)
ORDERING INFORMATION (Note 3)
Device
CAT4137TD−T3
(Note 1)
Package Shipping (Note 4)
TSOT−23
(Pb−Free)
3,000/
Tape & Reel
CAT4137TD−GT3 TSOT−23
(Note 2)
(Pb−Free)
3,000/
Tape & Reel
1. Matte−Tin Plated Finish (RoHS−compliant).
2. NiPdAu Plated Finish (RoHS−compliant)
3. For detailed information and a breakdown of
device nomenclature and numbering systems,
please see the ON Semiconductor Device No-
menclature document, TND310/D, available at
www.onsemi.com
4. For information on tape and reel specifications, in-
cluding part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifica-
tions Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2011
November, 2011 − Rev. 3
1
Publication Order Number:
CAT4137/D
1 page  
CAT4137
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, CIN = 1.0 mF, COUT = 0.22 mF, L = 22 mH with 3 LEDs at 20 mA, TAMB = 25°C, unless otherwise specified.)
35
30 RFB = 10 W
0.4
25
20 RFB = 15 W
15 RFB = 20 W
0.2
0
10
5
0
2.0 2.5 3.0 3.5 4.0 4.5
INPUT VOLTAGE (V)
Figure 8. LED Current vs. Input Voltage
(3 LEDs)
100
5.0
−0.2
−0.4
2.0
2.5 3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
Figure 9. LED Current Regulation
100
5.5
90
15 mA
80
20 mA
70
90 VIN = 4.2 V
VIN = 3.6 V
80
70
60
2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
Figure 10. Efficiency across Supply Voltage
(3 LEDs)
100
60
0 5 10 15 20 25 30
LED CURRENT (mA)
Figure 11. Efficiency across Load Current
(3 LEDs)
100
90
15 mA
80
20 mA
70
60
2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
Figure 12. Efficiency across Supply Voltage
(4 LEDs)
90 VIN = 4.2 V
VIN = 3.6 V
80
70
60
0 5 10 15 20 25 30
LED CURRENT (mA)
Figure 13. Efficiency across Load Current
(4 LEDs)
http://onsemi.com
5
5 Page 
CAT4137
Typical Applications
VIN L
2.2 V to
5.0 V
33 mH
D
C1
1 mF
SW
VIN
VOUT
C2
1 mF
OFF ON
CAT4137
SHDN FB
GND
VFB = 300 mV
20 mA
R1
15 W
L: Sumida CDRH3D16−330
D: Central CMDSH2-3 (rated 30 V)
C2: Taiyo Yuden GMK212BJ105KG-T (rated 35 V)
Figure 25. CAT4137 Driving Two LEDs
For best performance, a 33 mH inductor and a 1 mF output
capacitor are recommended for 2−LED applications.
In 2−LED configuration, the CAT4137 can be powered
from two AA alkaline cells or from a Li−ion battery.
100
95
90 VIN = 3.6 V
85 VIN = 3.0 V
80
75
70
0 10 20 30 40
LED CURRENT (mA)
Figure 26. Efficiency vs. LED Current, Two LEDs
http://onsemi.com
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet CAT4137.PDF ] | |
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