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LTC3403 数据表(PDF) 1 Page - Linear Technology |
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LTC3403 数据表(HTML) 1 Page - Linear Technology |
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1 / 16 page  1 LTC3403 3403f APPLICATIO S TYPICAL APPLICATIO s WCDMA Cell Phone Power Amplifiers s Wireless Modems Figure 1a. WCDMA Transmitter Power Supply Figure 1b. Efficiency vs Output Current , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. VIN CIN † 10 µF CER VIN 2.7V TO 5V * ** † LTC3403 RUN REF 2.2 µH* 3403 F01a MURATA LQH32CN2R2M11 TAIYO YUDEN JMK212BJ475MG TAIYO YUDEN JMK212BJ106MN 3 SW MODE GDR VOUT GND COUT** 4.7 µF CER VOUT 3 × VREF 600mA WCDMA RF PA OUTPUT PROGRAMMING DAC OUTPUT CURRENT (mA) 60 70 75 85 95 0.1 10 100 1000 3403 F01b 50 1 80 65 55 90 VIN = 3.6V VIN = 3.6V VIN = 4.2V VIN = 4.2V FORCED CONTINUOUS MODE Burst Mode OPERATION VOUT = 1.8V 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor DESCRIPTIO FEATURES s Dynamically Adjustable Output from 0.3V to 3.5V s Very Low Quiescent Current: Only 20 µA During Operation s 600mA Output Current s Internal P-Channel MOSFET Bypass Transistor s High Efficiency: Up to 96% s 1.5MHz Constant Frequency Operation s No Schottky Diode Required s Low Dropout Operation: 100% Duty Cycle s 2.5V to 5V Input Voltage Range s Drives Optional External P-Channel MOSFET s Shutdown Mode Draws < 1 µA Supply Current s Current Mode Operation for Excellent Line and Load Transient Response s Overtemperature Protected s Available in 8-Lead 3mm × 3mm DFN Package The LTC ®3403 is a high efficiency monolithic synchro- nous buck regulator optimized for WCDMA power ampli- fier applications. The output voltage can be dynamically programmed from 0.3V to 3.5V. At VOUT > 3.6V an internal bypass P-channel MOSFET connects VOUT directly to VIN, eliminating power loss through the inductor. Selectable forced continuous mode enables fast VOUT response to the controlling input. Supply current is only 20 µA in Burst Mode® operation and drops to <1 µA in shutdown. The 2.5V to 5V input voltage range makes the LTC3403 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. The LTC3403 is available in a low profile 8-lead 3mm × 3mm DFN package. |
类似零件编号 - LTC3403 |
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类似说明 - LTC3403 |
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