LTC1877
PRODUCTIONHigh Efficiency Monolithic Synchronous Step-Down Regulator
- Part Models
- 4
- 1ku List Price
- Starting From $4.61
Overview
- High Efficiency: Up to 95%
- Very Low Quiescent Current: Only 10μA During Operation
- 600mA Output Current at VIN = 5V
- 2.65V to 10V Input Voltage Range
- 550kHz Constant-Frequency Operation
- No Schottky Diode Required
- Low Dropout Operation: 100% Duty Cycle
- Synchronizable from 400kHz to 700kHz
- Selectable Burst Mode® Operation or Pulse-Skipping Mode
- 0.8V Reference Allows Low Output Voltages
- Shutdown Mode Draws < 1μA Supply Current
- ±2% Output Voltage Accuracy
- Current Mode Control for Excellent Line and Load Transient Response
- Overcurrent and Overtemperature Protected
- Available in 8-Lead MSOP Package
The LTC1877 s a high efficiency monolithic synchronous buck regulator using a constant-frequency, current mode architecture. Supply current during operation is only 10μA and drops to < 1μA in shutdown. The 2.65V to 10V input voltage range makes the LTC1877 ideally suited for both single and dual Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.
Switching frequency is internally set at 550kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications the LTC1877 can be externally synchronized from 400kHz to 700kHz. Burst Mode operation is inhibited during synchronization or when the SYNC/MODE pin is pulled low, preventing low frequency ripple from interfering with audio circuitry.
The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.8V feedback reference voltage. The LTC1877 is available in a space saving 8-lead MSOP package. Lower input voltage applications (less than 7V abs max) should refer to the LTC1878 data sheet.
Applications
- Cellular Telephones
- Wireless Modems
- Personal Information Appliances
- Portable Instruments
- Distributed Power Systems
- Battery-Powered Equipment
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 |
|---|---|---|---|
| LTC1877EMS8#PBF | 8-Lead MSOP | ||
| LTC1877EMS8#TRPBF | 8-Lead MSOP | ||
| LTC1877IMS8#PBF | 8-Lead MSOP | ||
| LTC1877IMS8#TRPBF | 8-Lead MSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jan 29, 2023 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LTC1877EMS8#PBF | PRODUCTION | |
| LTC1877EMS8#TRPBF | PRODUCTION | |
|
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC1877EMS8#PBF | PRODUCTION | |
| LTC1877EMS8#TRPBF | PRODUCTION | |
| LTC1877IMS8#PBF | PRODUCTION | |
| LTC1877IMS8#TRPBF | PRODUCTION | |
|
Jun 5, 2024 - 24_0004 Epoxy Change from Henkel 8290 to 8290A for MSOP (3) |
||
| LTC1877IMS8#PBF | PRODUCTION | |
| LTC1877IMS8#TRPBF | PRODUCTION | |
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 |
|---|---|---|
| Circuit Monitors 1 | ||
| LTC2960 | RECOMMENDED FOR NEW DESIGNS | 36V Nano-Current Two-Input Voltage Monitor |
| Oscillators 2 | ||
| LTC6908 | Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation | |
| 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 |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC1877
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
LTC1877EMS8 Demo Board | 2.65V to 10V Input, 1.5V to 3.3VOUT @ 600mA