Part Number: LTC1877EMS8#TRPBF

Manufacturer: Analog Devices Inc.

Description: IC REG BUCK ADJ 600MA 8MSOP

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of LTC1877EMS8#PBF

Datasheet  LTC1877EMS8#PBF datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – DC DC Switching Regulators
Manufacturer Linear Technology
Packaging Tube
Part Status Active
Function Step-Down
Output Configuration Positive
Topology Buck
Output Type Adjustable
Number of Outputs 1
Voltage – Input (Min) 2.65V
Voltage – Input (Max) 10V
Voltage – Output (Min/Fixed) 0.8V
Voltage – Output (Max) 10V
Current – Output 600mA
Frequency – Switching 550kHz
Synchronous Rectifier Yes
Operating Temperature -40°C ~ 85°C (TA)
Mounting Type Surface Mount
Package / Case 8-TSSOP, 8-MSOP (0.118″, 3.00mm Width)
Supplier Device Package 8-MSOP


If you’re interested in power management, you’ve probably heard about the LTC1877EMS8#TRPBF, a remarkable high-efficiency monolithic synchronous buck regulator. In this detailed guide, we’ll look at the features, uses, and essential characteristics of this versatile device to help you make the most of its possibilities.

Understanding the LTC1877EMS8#TRPBF

The LTC1877EMS8#TRPBF is a voltage regulator with a constant-frequency, current mode architecture that is small and multifunctional. It is intended to address the power management requirements of a wide range of applications, notably those that use single or dual Li-Ion batteries. Let’s take a closer look at what makes this regulator unique.

● Efficient Power Management

The LTC1877EMS8#TRPBF’s outstanding efficiency, capable of producing up to 95% efficiency, is one of its prominent qualities. Because this efficiency is critical for extending battery life in portable devices, it is an ideal choice for battery-powered equipment, personal information appliances, and other applications.

● Low Quiescent Current

The LTC1877EMS8#TRPBF operates with outstanding power efficiency, consuming only 10A of supply current. This property is critical for applications requiring energy conservation, such as wireless modems and distributed power systems.

● Wide Input Voltage Range

The regulator accepts input voltages ranging from 2.65V to 10V, making it suitable for a wide range of applications. It is ideal for devices that use diverse power sources, such as cellular phones and portable instruments.

● Constant-Frequency Operation

The LTC1877EMS8#TRPBF has a switching frequency of 550kHz. Because of this constancy, performance is predictable and compact surface-mount inductors and capacitors can be used.

● Elimination of Schottky Diode

This regulator eliminates the requirement for an external Schottky diode by utilizing an internal synchronous switch. This not only simplifies the design but also contributes to the overall efficiency of the system.

● Voltage Regulation

Because of its 0.8V feedback reference voltage, the device can sustain low output voltages. This functionality is useful in applications that demand precise voltage control.

● Synchronization and Control Modes

The LTC1877EMS8#TRPBF can be externally synced with a frequency range of 400kHz to 700kHz for noise-sensitive applications. It also has the option of operating in Burst Mode® or Pulse-Skipping Mode, which adds versatility to its capabilities.

● Power Management in Shutdown

When the regulator is not in use, it enters a shutdown mode, drawing less than 1A of supply current. This power-saving mode is critical for devices that run on batteries.

● Precision and Protection

The device has a 2% output voltage precision and overcurrent and overtemperature protection, ensuring the connected system’s safety and reliability.

● Compact and Convenient

The LTC1877EMS8#TRPBF is available in an 8-lead MSOP package, conserving space and making integration into your application easier.

LTC1877EMS8#TRPBF Operation

The LTC1877EMS8#TRPBF functions efficiently in a variety of modes and includes security measures. Here’s a rundown of how it works:

Burst Mode Operation:

  • Burst Mode operation is supported by the LTC1877EMS8#TRPBF.
  • Burst Mode minimizes power usage under low load conditions, hence improving battery life.
  • To enhance efficiency, the regulator intelligently alternates between Burst Mode and continuous operation dependent on the load.

Short-Circuit Protection:

  • The LTC1877EMS8#TRPBF provides short-circuit protection to protect against short circuits or overcurrent circumstances.
  • It can respond fast to excessive current and reduce it, saving harm to the regulator and associated devices.

Frequency Synchronization:

  • The switching frequency of the LTC1877EMS8#TRPBF is internally fixed at 550kHz, which provides adequate performance in most applications.
  • It can be externally synced from 400kHz to 700kHz for noise-sensitive applications or to synchronize with other components.
  • This enables the switching frequency to be fine-tuned to avoid interference with audio equipment or to satisfy special design needs.

Dropout Operation:

  • The LTC1877EMS8#TRPBF has a 100% duty cycle, which allows for low dropout operation.
  • Low dropout is critical for improving battery life in portable systems and ensuring consistent power output when input voltage drops.

Low Supply Operation:

  • During typical operation, this regulator is designed to operate with a low supply current of only 10A.
  • The supply current lowers to less than 1A in shutdown mode, reducing power consumption while the device is not in use.

Slope Compensation and Inductor Peak Current:

  • The slope compensation in the LTC1877EMS8#TRPBF is utilized to increase transient response in current mode control.
  • It also adjusts the inductor’s peak current, guaranteeing stable and economical functioning.

Inductor Value Calculation:

  • Choosing the correct inductor value is critical for the LTC1877EMS8#TRPBF to function properly.
  • The value of the inductor should be determined by the intended output voltage, input voltage range, and operating frequency.
  • To guarantee that the regulator performs optimally, detailed calculations that take these considerations into account are required.

In summary, the LTC1877EMS8#TRPBF’s operation is distinguished by its capacity to adapt to varying load situations, defend against faults, synchronize with other components, and retain efficiency even when supplied with low voltages. Calculating the proper inductor value is also critical to ensuring that the regulator works properly in your specific application.


The adaptability of the LTC1877EMS8#TRPBF extends to a wide range of applications. Here’s a detailed look at how it can be utilized efficiently in a variety of industries:

Cellular Telephones

  • Mobile phones frequently rely on battery power and necessitate accurate voltage management.
  • The LTC1877EMS8#TRPBF provides a reliable power supply, which extends battery life and improves device performance.

Wireless Modems

  • Wireless modems in data communication equipment necessitate a dependable power source.
  • This regulator maintains constant power, ensuring uninterrupted wireless communication.

Personal Information Appliances

  • Smartwatches, portable devices, and personal health monitors all benefit from efficient power management.
  • The LTC1877EMS8#TRPBF assists these devices by delivering low quiescent current and steady voltage control.

Portable Instruments

  • Power supply for portable measuring and testing tools used in a variety of sectors must be precise and stable.
  • These applications benefit from the regulator’s low dropout operation and precise voltage control.

Distributed Power Systems

  • The LTC1877EMS8#TRPBF is critical in systems where distributed power regulation is required, such as networking or industrial installations.
  • Its characteristics, such as a wide input voltage range and low quiescent current, make it a dependable choice for distributed power.

The LTC1877EMS8#TRPBF’s versatility and performance make it a great asset in a variety of sectors, ensuring steady and efficient power regulation in a wide range of applications. This regulator provides a solid solution to satisfy your power management demands whether you’re creating consumer electronics, wireless communication devices, or portable instrumentation.


The LTC1877EMS8#TRPBF is a high-performance synchronous buck regulator with excellent efficiency, low quiescent current, and a broad input voltage range. This regulator provides the capabilities and flexibility required for success whether you are creating battery-powered gadgets or applications with rigorous noise requirements. With overcurrent and overtemperature protection, it assures the longevity of both the regulator and the devices to which it is connected. Its small 8-lead MSOP packaging makes it ideal for applications with limited space. The LTC1877EMS8#TRPBF is a fully adaptable power regulation solution.

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