LTC3561
LAST TIME BUY1A, 4MHz, Synchronous Step-Down DC/DC Converter
- Part Models
- 2
- 1ku List Price
- Starting From $3.82
Overview
- Uses Tiny Capacitors and Inductor
- High Frequency Operation: Up to 4MHz
- High Switch Current: 1.4A
- Low RDS(ON) Internal Switches: 0.110Ω
- High Efficiency: Up to 95%
- VIN: 2.63V to 5.5V
- Stable with Ceramic Capacitors
- Current Mode Operation for Excellent Line and Load Transient Response
- Short-Circuit Protected
- Low Dropout Operation: 100% Duty Cycle
- Low Shutdown Current: IQ ≤ 1µA
- Low Quiescent Current: 240µA
- Output Voltages from 0.8V to 5V
- Low Noise Pulse-Skipping Operation
- Small 8-Pin DFN Package
The LTC3561 is a constant-frequency, synchronous, step-down DC/DC converter. Intended for medium power applications, it operates from a 2.63V to 5.5V input voltage range and has a user configurable operating frequency up to 4MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. The output voltage is adjustable from 0.8V to 5V. Internal synchronous 0.11Ω power switches with 1.4A peak current ratings provide high efficiency. The LTC3561’s current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors.
To further maximize battery life, the P-channel MOSFET is turned on continuously in dropout (100% duty cycle). The no-load quiescent current is only 240µA. In shutdown, the device draws <1µA.
Applications
- Wireless LAN Power
- Notebook Computers
- Digital Cameras
- Cellular Phones
- Board Mounted Power Supplies
Documentation
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 |
|---|---|---|---|
| LTC3561EDD#PBF | 8-Lead DFN (3mm x 3mm x 0.75mm w/ EP) | ||
| LTC3561EDD#TRPBF | 8-Lead DFN (3mm x 3mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jul 29, 2026 - 26_0046 Discontinuation of Parts Manufactured in TSMC Fab 2 and 5 in Hsinchu, Taiwan. |
||
| LTC3561EDD#PBF | ||
| LTC3561EDD#TRPBF | ||
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Circuit Monitors 1 | ||
| LTC2960 | RECOMMENDED FOR NEW DESIGNS | 36V Nano-Current Two-Input Voltage Monitor |
| 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 |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC3561A | PRODUCTION | 1A, 4MHz, Synchronous Step-Down DC/DC Converter |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC3561
- LTC3561A
LTpowerCAD 1
Design tools for the following parts are available in LTpowerCAD:
- LTC3561
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.
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
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