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PDF CAT32 Data sheet ( Hoja de datos )
| Número de pieza | CAT32 | |
| Descripción | CMOS White LED Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT32 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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CAT32
CMOS White LED Driver
Description
The CAT32 is a DC/DC step up converter that delivers a regulated
output current. Operation at a constant switching frequency of
1.2 MHz allows the device to be used with very small value external
inductor and ceramic capacitors.
The CAT32 is targeted to drive multiple white light−emitting diodes
(LEDs) connected in series and provides the necessary regulated current
to control the brightness and the color purity. An external resistor RSET
controls the output current level. LED currents of up to 40 mA can be
supported over a wide range of input supply voltages from 2 V to 7 V,
making the device ideal for battery−powered applications.
A high voltage output stage allows up to 4 White LEDs to be driven
in series. Series drive provides inherent current matching.
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 “near zero”
quiescent current.
In addition to overcurrent limiting protection, the device also
includes detection circuitry to ensure protection against open−circuit
load fault conditions.
The device is available in a low profile (1 mm max height) 6−lead
TSOT−23 package.
Features
• Low Quiescent Ground Current (0.5 mA Typical)
• Power Efficiency Over 80%
• Compatible Pinout with LT1932
• Adjustable Output Current (up to 40 mA)
• High Frequency 1.2 MHz Operation
• Input Voltage Operation down to 2.0 V
• Low Resistance (0.5 W) High Voltage Power Switch
• Drives up to 4 White LEDs in Series
• Shutdown Current Less than 1 mA
• Load Fault Protection Against Open−circuits
• Low Value External Components
• Low Profile (1 mm) TSOT−23 6−lead Package
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• Color LCD and Keypad Backlighting
• Cellular Phones
• Handheld Terminals
• Digital Cameras
• PDAs/Games
• Portable MP3 Players
http://onsemi.com
1
TSOT−23
TD SUFFIX
CASE 419AF
PIN CONNECTIONS
1
SW
VIN
GND
SHDN
LED RSET
TSOT−23
1 mm Maximum Height
qJA = 250°C/W (free air)
(Top View)
MARKING DIAGRAMS
VFYM
VF = CAT32TDI−GT3
Y = Production Year (Last Digit)
M = Production Month (1−9, A, B, C)
ORDERING INFORMATION
Device
Package
Shipping
CAT32TDI−GT3
TSOT−23
(Pb−Free)
3,000/
Tape & Reel
© Semiconductor Components Industries, LLC, 2014
April, 2014 − Rev. 5
1
Publication Order Number:
CAT32/D
1 page  
CAT32
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, TAMB = 25°C, CIN = 4.7 mF, COUT = 1 mF, L = 6.8 mH, unless otherwise specified.)
1.0 1.0
0.8 0.8
0.6 0.6
VIN = 3 V
0.4 0.4
0.2
0
23 4 56
INPUT VOLTAGE (V)
Figure 8. Switch Resistance vs. Input Voltage
0.2
0
−50 −25 0 25 50 75 100 125
TEMPERATURE (°C)
Figure 9. Switch Resistance vs. Temperature
300
250
200
150
100
50
0
0 8 16 24 32 40
LED CURRENT (mA)
Figure 10. LED Pin Voltage vs. LED Current
85
Figure 11. VSW, IL, & VOUT Signal Waveforms
80
75
70
4 LEDs at 15 mA
VOUT = 13 V
65
60
23 45
INPUT VOLTAGE (V)
Figure 12. Efficiency vs. Input Voltage
6
Figure 13. PWM on SHDN Pin Waveform
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5
5 Page 
CAT32
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 CAT32TDI−GT3 (TSOT−23, Industrial Temperature Range, NiPdAu, Tape & Reel, 3,000 / Reel).
4. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
5. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks,
copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. SCILLC
reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any
particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without
limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications
and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC
does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for
surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where
personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and
its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly,
any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture
of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email: [email protected]
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5817−1050
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
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11
CAT32/D
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet CAT32.PDF ] | |
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