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LCLV Datasheet(PDF) 1 Page - Linear Technology |
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LCLV Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT3502/LT3502A 1 3502fc FEATURES APPLICATIONS DESCRIPTION 1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm × 2mm DFN and MS10 The LT®3502/LT3502A are current mode PWM step-down DC/DC converters with an internal 500mA power switch, in tiny 8-lead 2mm × 2mm DFN and 10-lead MS10 packages. The wide input voltage range of 3V to 40V makes the LT3502/LT3502A suitable for regulating power from a wide variety of sources, including 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and capacitors, resulting in a very small solution. Constant frequency above the AM band avoids interfering with radio reception, making the LT3502A particularly suitable for automotive applications. Cycle-by-cycle current limit and frequency foldback provide protection against shorted outputs. Soft-start and frequency foldback eliminates input current surge during start-up. DA current sense provides further protec- tion in fault conditions. An internal boost diode reduces component count. 3.3V Step-Down Converter ■ 3V to 40V Input Voltage Range ■ 500mA Output Current ■ Switching Frequency: 2.2MHz (LT3502A), 1.1MHz (LT3502) ■ 800mV Feedback Voltage ■ Short-Circuit Robust ■ Soft-Start ■ Low Shutdown Current: <2μA ■ Internally Compensated ■ Internal Boost Diode ■ Thermally Enhanced 2mm × 2mm 8-Lead DFN and 10-lead MS10 Package ■ Automotive Systems ■ Battery-Powered Equipment ■ Wall Transformer Regulation ■ Distributed Supply Regulation LT3502A 12VIN Efficiency VIN 0.1μF 3502 TA01a 31.6k 10k 6.8μH SHDN BOOST SW LT3502A BD GND DA FB OFF ON 10μF 1μF VIN 4.7V TO 40V VOUT 3.3V 500mA LOAD CURRENT (A) 0 0 10 30 40 50 0.2 0.4 0.5 90 3502 TA01b 20 0.1 0.3 60 70 80 3.3VOUT 5VOUT TYPICAL APPLICATION L, 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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