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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC1401 датащи(PDF) 1 Page - Semtech Corporation |
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SC1401 датащи(HTML) 1 Page - Semtech Corporation |
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1 / 17 page  SC1401 © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 HIGH PERFORMANCE SYNCHRONOUS BUCK CONTROLLER WITH LDO FOR PORTABLE POWER November 21, 2000 1 DESCRIPTION The SC1401 is a synchronous buck regulator designed to power the latest generation microprocessors in battery operated systems. The SC1401 may be used to provide both the I/O and core voltages utilizing synchronous rectification for the core supply voltage and an LDO N-Channel MOSFET controller for the I/O supply voltage. A 1.25 volt reference allows lower output voltages required by today’s portable microprocessors. The synchronous buck regulator is capable of achieving efficiencies up to 95%. The gate drive circuitry can deliver 2.0A peak currents, allowing the use of N-channel MOSFETs for lower switching and conduction losses. A digital soft start is provided to ensure orderly start up of the power supply without the need for external components. At light load in power save mode, the controller changes mode of operation by missing gate drive cycles, thus reducing gate drive current and improving efficiency. A logic high on PSAVE disables the power saving mode thus reducing noise. The SC1401 is fabricated in a high performance BiCMOS process. This process reduces the power dissipation in low current and shutdown operation modes and improves efficiency. The LDO controller is a high performance positive voltage regulator designed to provide a low noise power source to the microprocessor peripherals by driving a low cost external N-Channel MOSFET. FEATURES • >90% Efficiency (SMPS) • 6.0V to 30V Input range • 1.25V to 5.5V Adjustable output (SMPS) • PWM and LDO regulator outputs • High output gate drive of 2 Amps (SMPS) • Power save mode for light load operation • 200kHz/300kHz fixed-frequency PWM operation • 2mA Typical quiescent current • 2µA Typical shutdown current DEVICE PACKAGE TEMP. (TA) SC1401ISS SSOP-20 -40°C - +85°C ORDERING INFORMATION TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com APPLICATIONS • Notebook and palmtop computers • LCD monitors • Internet appliances Notes (1) Add suffix “TR” for tape and reel. TYPICAL APPLICATION CIRCUIT C16 D3 C15 C7 VO_LINEAR C3 R6 SHDN R2 RESET U1 SC1401ISS 18 14 11 9 13 15 17 16 10 19 12 20 8 3 5 2 4 1 7 6 ENABLEIO BST PGND DL DH VDD2 IOS GATEIO PGND RESET PHASE PSAVE V5V FB GND SHDN VDD1 SYNC CSH CSL R5 C5 +5V L1 C1 D2 VO_SMPS PSAVE VDD2 R1 C12 C13 C10 C14 Q2 R3 R7 C8 D1 Q1 C6 Q3 C9 C4 C2 SYNC D4 C11 R4 ENABLE_IO VIN +5V |
Аналогичный номер детали - SC1401 |
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Аналогичное описание - SC1401 |
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