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LT1500IS-3 Datasheet(PDF) 1 Page - Linear Technology |
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LT1500IS-3 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1500/LT1501 Adaptive-Frequency Current Mode Switching Regulators FEATURES DESCRIPTION The LT ®1500 is an adaptive-frequency current mode step- up switching regulator with an internal power switch that is rated up to 700mA. In contrast to pulse skipping switching regulators, the LT1500 uses a current mode topology that provides lower noise operation and im- proved efficiency. Only at very light loads is Burst Mode TM activated to give high efficiency and micropower opera- tion. High switching frequency (up to 500kHz) allows very small inductors to be used, along with ceramic capacitors if desired. The LT1500 operates with input voltages from 1.8V to 15V and has only 200 µA operating current dropping to 8µA in shutdown. A low-battery comparator is included which stays alive in shutdown. A second output feedback pin with negative polarity allows negative output voltages to be regulated when the switcher is connected up as a Cuk or a flyback converter. Two package types are available. The LT1500 comes in a 14-pin SO package, with two options available for fixed output (3.3V or 5V) or adjustable operation. A reduced feature part, the LT1501, comes in the smaller 8-pin SO package with internal frequency compensation. It is also available in adjustable and fixed output voltage versions. s Low Noise Adaptive-Frequency Current Mode Operation Avoids Low Frequency Noise at Most Load Currents s Can Be Externally Synchronized (LT1500) s Micropower Quiescent Current: 200 µA s Shutdown Current: 8 µA Typ s Internal Loop Compensation s Low-Battery Comparator Active in Shutdown s Minimum Input Voltage: 1.8V Typ s Additional Negative Voltage Feedback Pin (LT1500) s Up to 500kHz Switching Frequency s Uses Low Profile, Low Cost Surface Mount Inductors , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. s Portable Instrumentation s Battery Operated Systems s PDA’s s Standby Power APPLICATIONS TYPICAL APPLICATION 2-Cell to 5V Converter SHDN VIN LBO LBI SW ISENSE GND OUT LT1501-5 + 1nF 301k 1% 301k 1% LOW-BATTERY FLAG (USE EXTERNAL PULL-UP) 33 µF* 6V + 220µF** 10V TANT 2 EACH NiCd OR ALKALINE CELLS 22 µH† 5V, 200mA LT1500/01 • TA01 AVX, TPSC107M006R0150 AVX, TPSD107M010 R0100 SUMIDA CD73-220, CD54-220 OR CD43-220. SELECT ACCORDING TO MAXIMUM LOAD CURRENT * ** † D1 MBR0520L |
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