LTC3547B
PRODUCTIONDual Monolithic 300mA Synchronous Step-Down Regulator
- Part Models
- 6
- 1ku List Price
- Starting From $2.97
Overview
- High Efficiency (Up to 96%) Dual Step-Down Outputs
- 300mA Output Current per Channel at VIN = 3V
- 2.25MHz Constant-Frequency Operation
- 2.5V to 5.5V Input Voltage Range
- Low Dropout Operation: 100% Duty Cycle
- No Schottky Diodes Required
- Internally Compensated for All Ceramic Capacitors
- Independent Internal Soft-Start for Each Channel
- Available in Fixed Output Versions
- Current Mode Operation for Excellent Line and Load Transient Response
- 0.6V Reference Allows Low Output Voltages
- Short-Circuit Protected
- Ultralow Shutdown Current: IQ < 1µA
- Low Profile (0.75mm) 8-Lead 3mm × 2mm DFN Package
The LTC3547B is a dual, 2.25MHz, constant-frequency, synchronous step-down DC/DC converter in a tiny 3mm × 2mm DFN package. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Low output voltages are supported with the 0.6V feedback reference voltage. Each regulator can supply 300mA continuous output current.
The input voltage range is 2.5V to 5.5V, making it ideal for Li-Ion polymer and USB powered applications. Supply current is only 1µA in shutdown.
An internally set 2.25MHz switching frequency allows the use of tiny surface mount inductors and capacitors. Internal soft-start reduces inrush current during start-up. All outputs are internally compensated to work with ceramic capacitors. The LTC3547B is available in a low profile (0.75mm) 3mm × 2mm DFN package. The LTC3547B is also available in a fixed output voltage configuration selected via internal resistor dividers.
Applications
- Cellular Telephones
- Digital Still Cameras
- Wireless and DSL Modems
- Portable Media Players
- PDAs/Palmtop PCs
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 |
|---|---|---|---|
| LTC3547BEDDB#TRMPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3547BEDDB#TRPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3547BEDDB-1#TRMPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3547BEDDB-1#TRPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3547BIDDB#TRMPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3547BIDDB#TRPBF | 8-Lead DFN (3mm x 2mm 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 |
|---|---|---|
| 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 | ||
| LTC2935 | PRODUCTION | Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds |
| 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:
- LTC3547
- LTC3547-1
- LTC3547B
- LTC3547B-1
LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
- LTC3547
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.
Evaluation Kits
LTC3547EDDB | Dual Monolithic Synchronous Buck Converter