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LTC1433CGN Datasheet(PDF) 1 Page - Linear Technology |
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LTC1433CGN Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LTC1433/LTC1434 450mA, Low Noise Current Mode Step-Down DC/DC Converters s Cellular Telephones s Portable Instruments s Wireless Modems s RF Communications s Distributed Power Systems s Scanners s Battery-Powered Equipment DESCRIPTION s High Efficiency: Up to 93% s Constant Frequency Adaptive Power TM Operation s Input Voltage Range: 3V to 13.5V s Internal 0.6 Ω Power Switch (VIN = 10V) s Low Dropout Operation: 100% Duty Cycle s Low-Battery Detector s Internal Power-On Reset Timer s Current Mode Operation for Excellent Line and Load Transient Response s Low Quiescent Current: 470 µA s Shutdown Mode Draws Only 15 µA Supply Current s ±1% Reference Accuracy s Available in 16- and 20-Lead Narrow SSOP FEATURES The LTC ®1433/LTC1434 are monolithic pulse width modu- lated step-down DC/DC converters. By utilizing current mode switching techniques, they provide excellent AC and DC load and line regulation. Both devices operate at a fixed frequency with the LTC1434 phase-lockable to an external clock signal. Both devices incorporate two internal P-channel power MOSFETs with a parallel combined resistance of 0.6 Ω (at a supply of 10V). The Adaptive Power output stage selec- tively drives one or both of the switches at frequencies up to 700kHz to reduce switching losses and maintain high efficiencies at low output currents. The LTC1433/LTC1434 are capable of supplying up to 450mA of output current and boasts a ±2.4% output voltage accuracy. An internal low-battery detector has the same level of accuracy as the output voltage. A power-on reset timer (POR) is included which generates a signal delayed by 65536/fCLK (300ms typ) after the output is within 5% of the regulated output voltage. Ideal for current sensitive applications, the devices draw only 470 µA of quiescent current. In shutdown the devices draw a mere 15 µA. To further maximize the life of the battery source, the internal P-channel MOSFET switch is turned on continuously in dropout. APPLICATIONS , LTC and LT are registered trademarks of Linear Technology Corporation. Adaptive Power is a trademark of Linear Technology Corporation. TYPICAL APPLICATION 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 SSW NC BSW NC SGND RUN/SS LBO LBI PWRVIN SVIN COSC POR ITH VOSENSE VPROG LTC1433 PGND 68 µF** 20V 0.1 µF 0.1 µF 100 µF* 10V D1: MOTOROLA MBRS130LT3 L1: COILCRAFT D03316-104 VOUT 3.3V D1 L1 100 µH POWER-ON RESET VIN 3.5V TO 12V 680pF 5.1k 10k 6800pF 47pF 1433/34 F01 *AVX TPSD107M010R0100 ** AVX TPSE686M020R0150 + Figure 1. High Efficiency Step-Down Converter LOAD CURRENT (A) 0.001 60 70 80 0.01 0.1 1 1433/34 TA01 50 40 100 90 VIN = 5V VIN = 12V VIN = 9V LTC1433 Efficiency for VOUT = 3.3V |
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