lt3572 Linear Technology Corporation, lt3572 Datasheet
lt3572
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lt3572 Summary of contents
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... Piezo drivers are allowed to start switching. The LT3572 is available in a (4mm × 4mm) 20-pin QFN package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ...
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... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT3572EUF#PBF LT3572EUF#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi ...
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... Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3572 is guaranteed to meet specifi ed performance from 0°C to 70°C operating junction temperature. Specifi cations over the –40°C to 85°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. ● ...
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... LT3572 TYPICAL PERFORMANCE CHARACTERISTICS Feedback Pin Voltage vs Temperature 1.25 1.24 1.23 1.22 1.21 1.20 –50 – 100 125 TEMPERATURE (°C) 3572 G01 Quiescent Current vs Temperature 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 –50 – 100 125 TEMPERATURE (°C) 3572 G04 SW Saturation Voltage vs Temperature 0.50 0.45 0. 800mA 0.35 SW 0.30 0. 400mA 0.20 SW 0.15 0.10 0.05 0 –50 – TEMPERATURE (° ...
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... OUTB and ⎯ O ⎯ U ⎯ T ⎯ Pull low to place OUTB and ⎯ O ⎯ U ⎯ T ⎯ high impedance state. FB (Pin 13): Feedback Pin. The LT3572 regulates this pin to 1.225V. Connect the feedback resistors to this pin to set the output voltage for the switching regulator. ...
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... LT3572 BLOCK DIAGRAM PWMA OUT Q2 OUTA OUTA OUTB OSCILLATOR OUTB 16 Q9 PWMB SHDN START-UP/ A6 INTERNAL BIAS – Q10 A7 RT SYNC PGOOD Figure 1. Block Diagram 12 SHDNA SHDNB ...
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... OPERATION Switching Regulator The LT3572 uses a constant frequency, current mode, control scheme to provide excellent line and load regulation for the output drivers. Operation can be best understood by referring to the Block Diagram in Figure 1. A pulse from the oscillator sets the RS fl ip-fl op, A4, and turns on the internal NPN bipolar power switch, Q1 ...
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... When any one of these pins are pulled above 1.5V the internal circuitry is turned on and the respective output is allowed to operate. When the LT3572 is not in use all three pins should be pulled low. Oscillator The LT3572 can operate at switching frequencies from 500kHz ...
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... Murata www.sumida.com www.tdk.com Diode Selection www.murata.com A Schottky diode is recommended for use with the LT3572. www.tdk.co.jp The Philips PMEG 3005 is a good choice. If the switch voltage exceeds 30V, a PMEG 4005 (a 40V diode) can be used. These diodes are rated to handle an average forward current of 0.5A. For higher effi ciency, use a diode with bet- ter thermal characteristics such as the On Semiconductor MBRM140 (a 40V diode) ...
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... TYPICAL APPLICATION 12μ OUT 10 SHDN SHDNA FB 100k 12 SHDNB 18 7 PWMA OUTA 6 LT3572 PWMB SYNC OUTA 4.7μF 15 PGOOD OUTB OUTB SS GND 34k 10nF V OUT 30V 50mA C4 R1 20pF 576k C1 10μ ...
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... UF Package 20-Lead Plastic QFN (4mm × 4mm) (Reference LTC DWG # 05-08-1710 Rev A) 0.70 ±0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 0.75 ± 0. 0.05 TYP 2.00 REF 0.200 REF 0.00 – 0.05 LT3572 PIN 1 NOTCH R = 0.20 TYP BOTTOM VIEW—EXPOSED PAD OR 0.35 × 45° CHAMFER R = 0.115 TYP 19 20 0.40 ± 0. 2.45 ± 0.10 2.45 ± ...
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... LT3572 RELATED PARTS PART NUMBER DESCRIPTION LT1160 Half-/Full-Bridge N-Channel MOSFET Driver LT3469 Piezo Microactuator Driver with Boost Regulator LT3479 3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection LT3580 42V, 2A, 2.5MHz High Effi ciency Step-Up DC/DC Converter Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● ...