LTC3620
PRODUCTIONUltralow Power 15mA Synchronous Step-Down Switching Regulator
- Part Models
- 4
- 1ku List Price
- Starting From $2.97
Overview
- High Efficiency: Up to 95%
- Maximum Current Output: 15mA
- Externally Programmable Frequency Clamp with Internal 50kHz Default Minimizes Audio Noise
- 18μA IQ Current
- 2.9V to 5.5V Input Voltage Range
- Low-Battery Detection
- 0.6V Reference Allows Low Output Voltages
- Shutdown Mode Draws <1μA Supply Current
- 2.8V Undervoltage Lockout
- Unique Low Noise Control Architecture
- Internal Power MOSFETs
- No Schottky Diodes Required
- Internal Soft-Start
- Tiny 2mm × 2mm 8-Lead DFN Package
The LTC3620 is a high efficiency, synchronous buck regulator, suitable for very low power, very small footprint applications powered by a single Li-Ion battery.
The internal synchronous switches increase efficiency and eliminate the need for external Schottky diodes. Low output voltages are easily supported by the 0.6V feedback reference voltage. The LTC3620-1 option is internally programmed to provide a 1.1V output.
The LTC3620 uses a unique variable frequency architecture to minimize power loss and achieve high efficiency. The switching frequency is proportional to the load current, and an internal frequency clamp forces a minimum switching frequency at light loads to minimize noise in the audio range. The user can program the frequency of this clamp by applying an external clock to the FMIN/MODE pin.
The battery status output, LOBATB, indicates when the input voltage drops below 3V. To help prevent damage to the battery, an undervoltage lockout (UVLO) circuit shuts down the part if the input voltage falls below 2.8V.
The LTC3620 is available in a low profile, 2mm × 2mm 8-lead DFN package.
Applications
- Hearing Aids
- Wireless Headsets
- Li-Ion Cell Applications
- Button Cell Replacement
Documentation
Data Sheet 1
User Guide 1
Design Note 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 |
|---|---|---|---|
| LTC3620EDC#TRMPBF | 8-Lead DFN (2mm x 2mm w/ EP) | ||
| LTC3620EDC#TRPBF | 8-Lead DFN (2mm x 2mm w/ EP) | ||
| LTC3620EDC-1#TRMPBF | 8-Lead DFN (2mm x 2mm w/ EP) | ||
| LTC3620EDC-1#TRPBF | 8-Lead DFN (2mm 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 |
| 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 1
Models for the following parts are available in LTspice:
- LTC3620
- LTC3620-1
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
LTC3620EDC Demo Board | 2.9V ≤ VIN ≤ 5.5V, VOUT = 1.1V/1.2V/1.8V @ 15mA
Resources
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