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LTC3442EDE Datasheet(PDF) 1 Page - Linear Integrated Systems |
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LTC3442EDE Datasheet(HTML) 1 Page - Linear Integrated Systems |
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1 / 20 page  LTC3442 1 3442f , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Burst Mode is a registered trademark of Linear Technology Corporation. Protected by U.S. Patents including 6404251, 6166527. SW1 VIN SHDN/SS RLIM RT SGND SW2 VOUT FB VC BURST PGND LTC3442 10µF 0.01µF VIN 2.5V TO 4.2V Li-Ion 340k 2.2k 22µF 220pF VOUT 3.3V 1.2A 200k 0.01µF 15k 470pF 3442 TA01a 4.7µH 1M 71.5k 200k TYPICAL APPLICATIO APPLICATIO S FEATURES DESCRIPTIO Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation The LTC ®3442 is a highly efficient, fixed frequency, Buck- Boost DC/DC converter, which operates from input volt- ages above, below, and equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for a single Lithium-Ion or multicell alkaline applications where the output voltage is within the battery voltage range. The device includes two 0.10Ω N-channel MOSFET switches and two 0.10Ω P-channel switches. Operating frequency and average input current limit can each be programmed with an external resistor. Quiescent current is only 35µA in Burst Mode operation, maximizing battery life in portable applications. Automatic Burst Mode opera- tion allows the user to program the load current for Burst Mode operation, or to control it manually. Other features include 1µA shutdown current, program- mable soft-start, peak current limit and thermal shutdown. The LTC3442 is available in a low profile, thermally en- hanced 12-lead (4mm × 3mm × 0.75mm) DFN package. ■ PDA/‘SMART’ Phones ■ Handheld Computers ■ MP3 Players ■ Handheld Instruments ■ Digital Cameras ■ Wireless Handsets ■ USB Peripherals Efficiency vs VIN VIN (V) 2.5 100 90 80 70 60 50 3.0 3.5 4.0 4.5 3442 • TA01b 5.0 5.5 1A LOAD 300mA LOAD VOUT = 3.3V L = 4.7µH F = 600kHz ■ Regulated Output with Input Voltages Above, Below, or Equal to the Output ■ Single Inductor, No Schottky Diodes Required ■ Manual or Programmable Automatic Burst Mode ® Operation ■ Programmable Average Input Current Limit ■ Up to 1.2A Continuous Output Current from a Single Lithium-Ion Cell ■ High Efficiency: Up to 95% ■ Output Disconnect in Shutdown ■ 2.4V to 5.5V Input Range ■ 2.4V to 5.25V Output Range ■ 35µA Quiescent Current in Burst Mode Operation ■ Programmable Frequency from 300kHz to 2MHz ■ <1µA Shutdown Current ■ Small, Thermally Enhanced 12-Lead (4mm × 3mm) DFN Package |
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