PDF SC1408 Data sheet ( Hoja de datos )

Número de pieza	SC1408
Descripción	LOW VOLTAGE/ BOOST DC-DC CONTROLLER
Fabricantes	Semtech Corporation
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No Preview Available ! LOW VOLTAGE, BOOST DC-DC CONTROLLER SC1408 August 22, 2000 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION The SC1408 is a low voltage boost controller that oper- ates from a 1.8V to 16.5V input range. A shutdown pin allows the user to turn the controller off reducing sup- ply current to less than 2µA typical. Output voltage can be preset to 5V or is adjustable from 3V to 16.5V with a resistor divider. The controller changes frequency in low load conditions to improve efficiency. The SC1408 was designed for two cell Alkaline or sin- gle cell Lithium Ion battery applications. With the proper external components it can be used as a boost converter or a buck/boost converter. A current sense is implemented with an external resis- tor that is not in the load current path. The SC1408 operates in “bootstrapped” mode. When the input voltage to the device is less than 2.5V during startup, a low voltage 50% fixed duty cycle oscillator is switched in to initiate boost action. FEATURES •= 1.8V to 16.5V input range •= Up to 10W output power •= Preset 5V or adjustable output •= Up to 300kHz switching frequency •= 10µA max shutdown current •= Industrial temperature range •= SO-8 or MSOP-8 package APPLICATIONS •= PDA Power supplies •= Battery powered applications •= Positive LCD Bias generator •= Portable communications (cellular phones) •= Peripheral card supplies •= Industrial power supplies ORDERING INFORMATION Part Number(1) SC1408IS.TR Package SO-8 Temp. Range (TA) -40° to +85°C SC1408IMS.TR MSOP-8 Note: (1) Only available in tape and reel packaging. A reel contains 2500 devices. TYPICAL APPLICATION - BOOST CONFIGURATION Vin (1.8V to 16.5V) L1 D1 Vout (3V to 16.5V) + C2 U1 2 BST GATE 1 4 SHDN ISENSE 8 5 REF FB 3 7 GND AGND 6 SC1408IS C5 Q1 R3 + C3 R2 R4 © 2000 SEMTECH CORP. 1 652 MITCHELL ROAD NEWBURY PARK CA 91320 1 page LOW VOLTAGE, BOOST DC-DC CONTROLLER August 22, 2000 Fig. 1: Typical Application - Boost Configuration SC1408 Vin=3.3V L1 22uH COILCRAFT DO3316P-223 C2 100uF + U1 2 BST GATE 1 4 SHDN ISENSE 8 5 REF 3 FB 7 GND AGND 6 C5 0.1uF SC1408IS D1 B130T Q1 IRLR024N R3 31.6k Vout=5V C9 (1) + C8 100uF R2 0.05Ohm R4 10.0k + C3 100uF (1) See Component Selection Fig. 2: Typical Application - Buck/Boost (SEPIC) Configuration D2 1N4148 Vin=2.7V to 6V C2 100uF + L1A 22uH 21 C4 0.1uF U1 2 BST GATE 1 4 SHDN ISENSE 8 5 REF FB 3 7 GND AGND 6 C5 0.1uF SC1408IS C1 100uF + Q1 IRLL3303 D1 B130T R3 31.6k C9 (1) 4 R2 0.05Ohm L1B 22uH R4 10.0k 3 L1A/L1B IS COUPLED INDUCTOR PULSE PE-53718 OR EQUIVALENT (1) See Component Selection Vout=5V + C8 100uF + C3 100uF © 2000 SEMTECH CORP. 5 652 MITCHELL ROAD NEWBURY PARK CA 91320 5 Page August 22, 2000 OUTLINE DRAWING - SO-8 LOW VOLTAGE, BOOST DC-DC CONTROLLER SC1408 JEDEC REF: MS-012AA LAND PATTERN - SO-8 © 2000 SEMTECH CORP. 11 652 MITCHELL ROAD NEWBURY PARK CA 91320 11 Page

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