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LTC3405 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3405 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC3405 3405fa ■ High Efficiency: Up to 96% ■ Very Low Quiescent Current: Only 20 µA During Operation ■ 300mA Output Current at VIN = 3V ■ 2.5V to 5.5V Input Voltage Range ■ 1.5MHz Constant Frequency Operation ■ No Schottky Diode Required ■ Low Dropout Operation: 100% Duty Cycle ■ 0.8V Reference Allows Low Output Voltages ■ Shutdown Mode Draws < 1µA Supply Current ■ ±2% Output Voltage Accuracy ■ Current Mode Operation for Excellent Line and Load Transient Response ■ Overtemperature Protected ■ Low Profile (1mm) ThinSOT TM Package The LTC ®3405 is a high efficiency monolithic synchro- nous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 20µA and drops to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3405 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 1.5MHz, allowing the use of small surface mount inductors and capacitors. 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 LTC3405 is available in a low profile (1mm) ThinSOT package. For new designs, refer to the LTC3405A data sheet. For fixed 1.5V and 1.8V output versions, refer to the LTC3405A-1.5/LTC3405A-1.8 data sheet. ■ Cellular Telephones ■ Personal Information Appliances ■ Wireless and DSL Modems ■ Digital Still Cameras ■ MP3 Players ■ Portable Instruments Figure 1a. High Efficiency Step-Down Converter 1.5MHz, 300mA Synchronous Step-Down Regulator in ThinSOT Figure 1b. Efficiency vs Load Current VIN CIN† 2.2µF CER VIN 2.7V TO 5.5V * ** † †† LTC3405 RUN MODE 3 4.7µH** 22pF 887k 280k 3405 F01a VOUT CONNECTED TO VIN FOR 2.7V < VIN < 3.3V MURATA LQH3C4R7M34 TAIYO YUDEN LMK212BJ225MG AVX TPSB336K006R0600 5 4 6 1 2 SW VFB GND COUT†† 33µF VOUT* 3.3V + , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. Protected by U.S. Patents, including 6580258, 5481178. OUTPUT CURRENT (mA) 0.1 10 1000 100 95 90 85 80 75 70 65 60 3405 F01b 1 100 VIN = 3.6V VIN = 4.2V VIN = 5.5V APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO |
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