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LTC3404EMS8 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3404EMS8 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC3404 3404fb APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO ■ High Efficiency: Up to 95% ■ Very Low Quiescent Current: Only 10 μA During Operation ■ 600mA Output Current at VIN = 3.3V ■ 2.65V to 6V Input Voltage Range ■ 1.4MHz Constant Frequency Operation ■ No Schottky Diode Required ■ Low Dropout Operation: 100% Duty Cycle ■ Synchronizable from 1MHz to 1.7MHz ■ Selectable Burst Mode ® Operation or Pulse Skipping Mode ■ 0.8V Reference Allows Low Output Voltages ■ Shutdown Mode Draws < 1 μA Supply Current ■ ±2% Output Voltage Accuracy ■ Current Mode Control for Excellent Line and Load Transient Response ■ Overcurrent and Overtemperature Protected ■ Available in 8-Lead MSOP Package The LTC ®3404 is a high efficiency monolithic synchro- nous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 10 μA and drops to < 1μA in shutdown. The 2.65V to 6V input voltage range makes the LTC3404 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Switching frequency is internally set at 1.4MHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications the LTC3404 can be externally synchronized from 1MHz to 1.7MHz. Burst Mode operation is inhibited during synchronization or when the SYNC/MODE pin is pulled low, preventing low frequency ripple from interfering with audio circuitry. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.8V feed- back reference voltage. The LTC3404 is available in a space saving 8-lead MSOP package. For higher input voltage (11V abs max) applications, refer to the LTC1877 data sheet. ■ Cellular Telephones ■ Wireless and DSL Modems ■ Personal Information Appliances ■ Portable Instruments ■ Distributed Power Systems ■ Battery-Powered Equipment High Efficiency Step-Down Converter 1.4MHz High Efficiency Monolithic Synchronous Step-Down Regulator Efficiency vs Output Load Current LOAD (mA) 80 75 85 90 95 100 0.1 10 100 1000 3404 TA02 70 1 VIN = 6V VIN = 4.2V VIN = 3.6V Burst Mode OPERATION VOUT = 3.3V L = 4.7 μH 22 μF** CER 7 6 1 2 5 3 4 SW VFB LTC3404 GND 4.7 μH* 10 μF*** CER 47pF VOUT † 3.3V * ** *** † TOKO D52LC A914BYW-4R7M TAIYO-YUDEN CERAMIC JMK325BJ226MM TAIYO-YUDEN CERAMIC LMK325BJ106MN VOUT CONNECTED TO VIN FOR 2.65V < VIN < 3.3V 887k 20pF 280k 3404 TA01 SYNC VIN RUN ITH VIN 2.65V TO 6V , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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