CAT32 ONSEMI | Alldatasheet

Document overview

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Technical content

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 V oltage Operation down to 2.0 V
  • Low Resistance (0.5 /C0087) High V oltage Power Switch
  • Drives up to 4 White LEDs in Series
  • Shutdown Current Less than 1 /C0109A
  • 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 TSOT−23 TD SUFFIX CASE 419AF PIN CONNECTIONS LLYM MARKING DIAGRAMS Device Package Shipping

ORDERING INFORMATION

CAT32TDI−T3 TSOT −23 (Pb−Free) 3,000/ Tape & Reel LL = CAT32TDI−T3 VF = CAT32TDI−GT3 Y = Production Year (Last Digit) M = Production Month (1−9, A, B, C) (Top View) VIN RSET SW GND LED SHDN TSOT−23 1 mm Maximum Height /C0113JA = 250°C/W (free air) VFYM CAT32TDI−GT3 TSOT −23 (Pb−Free) 3,000/ Tape & Reel

Figure 1. Li−Ion Driver for Four High−Brightness White LEDs Table 1. PIN DESCRIPTION imize the trace area connected to this pin. 2 5 GND Ground pin. Connect pin 2 to ground. 3 6 LED LED (cathode) connection pin. pin is also used to dim the LEDs. 4.7 /C0109F capacitor mounted close to the pin is recommended.

Table 2. ABSOLUTE MAXIMUM RATINGS Table 3. RECOMMENDED OPERATING CONDITIONS NOTE: Typical application circuit with external components is shown on page 2. Table 4. ELECTRICAL OPERATING CHARACTERISTICS

Figure 8. Switch Resistance vs. Input Voltage Figure 9. Switch Resistance vs. Temperature Figure 10. LED Pin Voltage vs. LED Current Figure 11. V SW, IL, & VOUT Signal Waveforms Figure 12. Efficiency vs. Input Voltage Figure 13. PWM on SHDN Pin Waveform

4 LEDs at 15 mA

frequency, current regulating boost converter. compensated loop for the regulation of the LED current. multiplication factor of 225. possible. A low LED pin voltage ensures high efficiency. for the remainder of the cycle. pin or by pulling the RSET pin higher than 0.1 V . Figure 14. CAT32 Block Diagram

1.2 MHz

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Application Information

Inductor Selection and Efficiency Inductor vendors are shown below. Contact the manufacturer for detailed technical data and new product information. Table 5. INDUCTOR MANUFACTURERS be used at the output to minimize the output ripple voltage. multilayer ceramic capacitors make them excellent choices. Table 6. CERAMIC CAPACITOR MANUFACTURERS diode has a voltage rating greater than the output voltage. or 0.5 A diode will be sufficient for most designs. Table 7. SCHOTTKY DIODE SUPPLIERS

Table 8. RSET RESISTOR VALUES accomplished two different ways. increasing the duty cycle will increase the LED brightness.

0.15 V /C00421/C0467

involving color LCDs can find the blue tint objectionable. the external NMOS switch is turned ON. under the switching regulator. GND pin and not be shared with other components. Figure 15. LED Dimming Circuits

Figure 16. Two LEDs with DC Level Dimming Control

2.5 V DC

Figure 17. Three LEDs with DC Level Dimming Control Figure 18. Efficiency − Three LEDs Figure 19. Four LEDs with PWM Dimming Control Figure 20. Efficiency − Four LEDs

http://onsemi.com PACKAGE DIMENSIONS TSOT−23, 6 LEAD CASE 419AF−01 ISSUE O E1 E e b D c A TOP VIEW SIDE VIEW END VIEW L Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-193. SYMBOL θ MIN NOM MAX /C0113 A b c D E e L 0º 8º 0.01 0.80 0.30 0.12 0.30 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

1.00 0.10 0.90 0.45 0.20 0.50

http://onsemi.com Example of Ordering Information (Note 3) Prefix Device # Suffix Company ID CAT 32 Product Number T: Tape & Reel 3: 3,000 / Reel Tape & Reel (Note 5) (Optional) TD Package I I = Industrial (−40°C to +85°C) Temperature Range TD: TSOT−23 − G G: NiPdAu Lead Finish 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 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, direct ly 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. CAT32/D PUBLICATION ORDERING INFORMATION 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: 81−3−5773−3850 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: orderlit@onsemi.com ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative