LTC3543
PRODUCTION600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum
- Part Models
- 2
- 1ku List Price
- Starting From $2.97
Overview
- 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 Efficiency: 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
The LTC3543 is a high efficiency 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® operation, 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 efficiency at light loads, further extending battery life. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode.
Applications
- Portable Instruments
- Cellular Phones
Documentation
Data Sheet 1
User Guide 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3543EDCB#TRMPBF | 6-Lead DFN (2mm x 3mm w/ EP) | ||
| LTC3543EDCB#TRPBF | 6-Lead DFN (2mm x 3mm w/ EP) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Oscillators 1 | ||
| LTC6909 | PRODUCTION | 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
| Supervisory Circuits & Reset ICs 1 | ||
| LTC2934 | PRODUCTION | Ultra-Low Power Adjustable Supervisor with Power-Fail Output |
| Switching Regulators & Controllers 1 | ||
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC3543
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
