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LTC3403

Features: ` Dynamically Adjustable Output from 0.3V to 3.5V`Very Low Quiescent Current: Only 20A During Operation` 600mA Output Current`Internal P-Channel MOSFET Bypass Transistor` High Efficiency: Up to 96%` 1.5MHz Constant Frequency Operation` No Schottky Diode Required` Low Dropout Operation: 1...

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SeekIC No. : 004402198 Detail

LTC3403: Features: ` Dynamically Adjustable Output from 0.3V to 3.5V`Very Low Quiescent Current: Only 20A During Operation` 600mA Output Current`Internal P-Channel MOSFET Bypass Transistor` High Efficiency: ...

LTC3403 Data Sheet

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Part Number:
LTC3403
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

` Dynamically Adjustable Output from 0.3V to 3.5V
`Very Low Quiescent Current: Only 20A During Operation
` 600mA Output Current
`Internal P-Channel MOSFET Bypass Transistor
` High Efficiency: Up to 96%
` 1.5MHz Constant Frequency Operation
` No Schottky Diode Required
` Low Dropout Operation: 100% Duty Cycle
` 2.5V to 5V Input Voltage Range
` Drives Optional External P-Channel MOSFET
` Shutdown Mode Draws < 1A Supply Current
` Current Mode Operation for Excellent Line and Load Transient Response
` Overtemperature Protected
` Available in 8-Lead 3mm* 3mm DFN Package


Application

· WCDMA Cell Phone Power Amplifiers
· Wireless Modems


Pinout

Connection Diagram


Specifications

Input Supply Voltage (<300ms) ................. 0.3V to 6V
Input Supply Voltage (DC) ....................... 0.3V to 5.5V
RUN, REF, MODE, VOUT, GDR Voltages ........ 0.3V to VIN
SW Voltage ................................... 0.3V to (VIN + 0.3V)
P-Channel Switch Source Current (DC) ................. 800mA
N-Channel Switch Sink Current (DC) ..................... 800mA
Peak SW Sink and Source Current ............................ 1.3A
Bypass P-Channel FET Source Current ......................... 1A
Operating Temperature Range (Note 2) .. ...40 to 85
Junction Temperature (Note 3) ................................ 125
Storage Temperature Range ................... 65 to 150
    (DD Package) ........................................ 65 to 125


Description

The LTC®3403 is a high efficiency monolithic synchronous buck regulator optimized for WCDMA power amplifier 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 20A in Burst Mode® operation and drops to <1A 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.




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