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LTC3408

Features: Dynamically Adjustable Output from 0.3V to 3.5V 600mA Output Current Internal 0.08Ω 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 Sh...

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SeekIC No. : 004402219 Detail

LTC3408: Features: Dynamically Adjustable Output from 0.3V to 3.5V 600mA Output Current Internal 0.08Ω P-Channel MOSFET Bypass Transistor High Efficiency: Up to 96% 1.5MHz Constant Frequency Operation...

LTC3408 Data Sheet

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Part Number:
LTC3408
Supply Ability:
5000

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  • 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
600mA Output Current
Internal 0.08Ω 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
Shutdown Mode Draws < 1µA 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 (<300µs) ..................  0.3V to 6V
Input Supply Voltage (DC) .......................  0.3V to 5.5V
RUN, REF, VOUT Voltages ..........................  0.3V to VIN
SW Voltage (DC) .........................  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 (DC) .............. 1A
Operating Temperature Range (Note 2) .40°C to 85°C
Junction Temperature (Note 3) ............................  125°C
Storage Temperature Range ............... 65°C to 125°C


Description

The LTC®3408 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 0.08Ω bypass P-channel MOSFET connects VOUT directly to VIN, eliminating power loss through the inductor.

The input voltage range is 2.5V to 5V making the LTC3408 ideally suited for single Li-Ion battery-powered applica-tions. 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 LTC3408 is available in a low profile (0.75mm) 8-lead 3mm × 3mm DFN package.




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