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LTC3543

Features: 600mA Output Current 2.5V to 5.5V Input Voltage Range 2.25MHz Constant Frequency Operation, Spread Spectrum or Synchronized PLL (1MHz to 3MHz) High Effi ciency: Up to 95% 1A Peak Inductor Current Very Low Quiescent Current: Only 45µA During Burst Mode Operation No Schottky D...

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SeekIC No. : 004402288 Detail

LTC3543: Features: 600mA Output Current 2.5V to 5.5V Input Voltage Range 2.25MHz Constant Frequency Operation, Spread Spectrum or Synchronized PLL (1MHz to 3MHz) High Effi ciency: Up to 95% 1A Peak In...

LTC3543 Data Sheet

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Part Number:
LTC3543
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:

600mA Output Current
2.5V to 5.5V Input Voltage Range
2.25MHz Constant Frequency Operation, Spread Spectrum or Synchronized PLL (1MHz to 3MHz)
High Effi ciency: Up to 95%
1A Peak Inductor Current
Very Low Quiescent Current: Only 45µA During Burst Mode Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Overtemperature Protected
Stable with Ceramic Capacitors
Shutdown Mode Draws <1µA Supply Current
±2% Output Voltage Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
Soft-Start
Available in a Low Profi le (0.75mm) 2mm * 3mm 6-Lead DFN Package


Application

Portable Instruments
Cellular Phones


Pinout

Connection Diagram


Specifications

VIN Voltage ......................................................0.3V to 6V
RUN, VFB, MODE, CAP Voltages .......................0.3V to VIN
SW Voltage ........................................0.3V to (VIN + 0.3V)
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®3543 is a high effi ciency monolithic synchronous current mode buck regulator.

The switching frequency is internally set at 2.25MHz, allowing the use of small surface mount inductors and capacitors. In PLL mode, the LTC3543 can acquire frequencies between 1MHz and 3MHz. Also, the LTC3543 has spread spectrum capability providing a lower noise regulated output, as well as low noise at the input. In Burst Mode® 0peration, the supply current is only 45µA, dropping to <1µA in shutdown.

The 2.5V to 5.5V input voltage range makes the LTC3543 ideally suited for single Li-Ion battery-powered applications.

The 100% duty cycle provides a low dropout operation, extending the battery life in portable systems. Burst Mode operation increases effi ciency at light loads, further extending battery life. The internal synchronous switch increases effi ciency and eliminates the need for an external Schottky diode.




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