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Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 13
Technical content
Features
- Switch Current Limit 750 mA
- Drives LED Strings up to 22 V
- Up to 87% Efficiency
- Low Quiescent Ground Current 0.6 mA
- 1 MHz Fixed Frequency Low Noise Operation
- Soft Start “In−rush” Current Limiting
- Shutdown Current Less than 1 /C0109A
- Open LED Overvoltage Protection
- Automatic Shutdown at 1.9 V (UVLO)
- Thermal Overload Protection
- TSOT−23 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 www.onsemi.com TSOT−23 TD SUFFIX CASE 419AE PIN CONNECTIONS MARKING DIAGRAM Device Package Shipping
ORDERING INFORMATION
CAT4139TD−GT3 (Note 1) TSOT−23 (Pb−Free) 3,000/ Tape & Reel TP = Specific Device Code Y = Production Year (Last Digit) M = Production Month (1−9 (Jan−Sep), O, N, D (Oct−Dec)) (Top View) VIN SHDN SW GND FB TPYM 1. NiPdAu Plated Finish (RoHS−compliant)
Figure 1. Typical Application Circuit Table 1. ABSOLUTE MAXIMUM RATINGS should not be assumed, damage may occur and reliability may be affected. Table 2. RECOMMENDED OPERATING CONDITIONS (Typical application circuit with external components is shown above.) the Recommended Operating Ranges limits may affect device reliability.
- TSOT23−5 package thermal resistance /C0113JA = 135°C/W when mounted on board over a ground plane.
Table 3. DC ELECTRICAL CHARACTERISTICS performance may not be indicated by the Electrical Characteristics if operated under different conditions.
voltage higher than 1.5 V , the device is enabled. connected directly to the ground plane on the PCB. Schottky diode anode should be connected to the SW pin. SW voltage from exceeding the maximum rating. The lower LED cathode is connected to the FB pin. Table 4. PIN DESCRIPTIONS 1 SW Switch pin. This is the drain of the internal power switch. 2 GND Ground pin. Connect the pin to the ground plane. 3 FB Feedback pin. Connect to the last LED cathode. 4 SHDN Shutdown pin (Logic Low). Set high to enable the driver. Figure 17. Simplified Block Diagram
1 MHz
www.onsemi.com Device Operation The CAT4139 is a fixed frequency (1 MHz), low noise, inductive boost converter that provides a constant current with excellent line and load regulation. The device uses a high−voltage CMOS power switch between the SW pin and ground to energize the inductor. When the switch is turned off, the stored energy in the inductor is released into the load via the Schottky diode. The on/off duty cycle of the power switch is internally adjusted and controlled to maintain a constant regulated voltage of 0.3 V across the feedback resistor connected to the feedback pin (FB). The value of the resistor sets the LED current accordingly (0.3 V/R1). During the initial power−up stage, the duty cycle of the internal power switch is limited to prevent excessive in−rush currents and thereby provide a “soft−start” mode of operation. In the event of an “Open LED” fault condition, where the feedback control loop becomes open, the output voltage will continue to increase. Once this voltage exceeds 24 V , an internal protection circuit will become active and place the device into a very low power safe operating mode. Thermal overload protection circuitry has been included to prevent the device from operating at unsafe junction temperatures above 150 °C. In the event of a thermal overload condition the device will automatically shutdown and wait till the junction temperatures cools to 130°C before normal operation is resumed.
Application Information
External Component Selection Capacitors The CAT4139 only requires small ceramic capacitors of 4.7 /C0109F on the input and 1 /C0109F on the output. Under normal condition, a 4.7 /C0109F input capacitor is sufficient. For applications with higher output power, a larger input capacitor of 10 /C0109F may be appropriate. X5R and X7R capacitor types are ideal due to their stability across temperature range. Inductor A 22 /C0109H inductor is recommended for most of the CA T4139 applications. In cases where the efficiency is critical, inductances with lower series resistance are preferred. Inductors with current rating of 800 mA or higher are recommended for most applications. Sumida CDRH6D28−220 22 /C0109H inductor has a rated current of Schottky Diode The current rating of the Schottky diode must exceed the peak current flowing through it. The Schottky diode performance is rated in terms of its forward voltage at a given current. In order to achieve the best efficiency, this forward voltage should be as low as possible. The response time is also critical since the driver is operating at 1 MHz. Central Semiconductor Schottky rectifier CMSH1−40 (1 A rated) is recommended for most applications. LED Current Setting The LED current is set by the external resistor R1 connected between the feedback pin (FB) and ground. The formula below gives the relationship between the resistor and the current: R1 /C00430.3 V LED current Table 5. RESISTOR R1 AND LED CURRENT
www.onsemi.com PACKAGE DIMENSIONS TSOT−23, 5 LEAD CASE 419AE 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
www.onsemi.com Example of Ordering Information (Note 5) Prefix Device # Suffix Company ID CAT 4139 Product Number 4139 T: Tape & Reel 3: 3,000 / Reel Tape & Reel (Note 7) (Optional) TD Package TD: TSOT−23 − G G: NiPdAu Lead Finish SERIES LED DRIVERS Part Number Description ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ CAT4137 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ CMOS Boost Converter − White LED Driver ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ CAT4237 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ High Voltage CMOS Boost White LED Driver ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ CAT4238 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ High Efficiency 10 LED Boost Converter ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ CAT4139 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
22 V High Current Boost White LED Driver
ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ CAT4240 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
6 Watt Boost LED Driver
- All packages are RoHS−compliant (Lead−free, Halogen−free). 4. The standard lead finish is NiPdAu. 5. The device used in the above example is a CAT4139TD−GT3 (TSOT−23, NiPdAu, Tape & Reel, 3,000/Reel). 6. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office. 7. 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 the are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidia ries in the United States and/or other countries. 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 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 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 CAT4139/D LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor 19521 E. 32nd Pkwy, Aurora, Colorado 80011 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