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Analog Devices Inc. LTC1877EMS8#TRPBF
- Part No.:
- LTC1877EMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1877EMS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,856
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Product details
Overview
LTC1877EMS8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator with constant-frequency current-mode control, 550kHz switching, 0.8V reference, and 600mA output capability at 5V input. It delivers up to 95% efficiency in portable Li-ion battery systems requiring low quiescent current (10μA operating, <1μA shutdown) and low-dropout operation via 100% duty cycle.
For engineers reviewing the LTC1877EMS8#TRPBF datasheet, LTC1877EMS8#TRPBF pinout, LTC1877EMS8#TRPBF application, or LTC1877EMS8#TRPBF equivalent, key selection criteria include its 2.65V–10V input range, Burst Mode® vs pulse-skipping mode control via SYNC/MODE pin, ±2% output voltage accuracy, internal P/N-channel MOSFETs eliminating external Schottky diodes, and MS8 package thermal performance (θJA = 150°C/W).
Technical Context
The LTC1877EMS8#TRPBF implements a fixed-frequency current-mode buck architecture with integrated 0.65Ω P-channel and 0.75Ω N-channel MOSFETs, enabling high-efficiency regulation without external diodes. Its error amplifier drives the ITH pin to control peak inductor current, while the 0.8V feedback reference supports precise output programming down to sub-1V levels.
Frequency synchronization (400–700kHz) is achieved via PLL-based locking to an external clock on the SYNC/MODE pin, disabling Burst Mode during sync. Overcurrent protection uses peak-current limiting and frequency foldback (to ~80kHz under short-circuit), while OVDET guards against >6.25% output overvoltage transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.65V to 10V - supports single/dual Li-ion battery inputs and ensures stable operation across full discharge curves. |
| Output Current | 600mA at VIN = 5V - sufficient for powering baseband processors, RF modules, and sensor subsystems in portable devices. |
| Switching Frequency | 550kHz (internal), synchronizable 400–700kHz - enables use of compact 10μH inductors and reduces EMI filtering burden. |
| Quiescent Current | 10μA operating, <1μA shutdown - extends battery runtime in always-on or sleep-mode applications like wireless modems. |
| Feedback Reference | 0.8V ±2% - allows accurate low-voltage outputs (e.g., 1.2V, 1.5V, 1.8V) using standard resistor dividers with remote sensing capability. |
| Efficiency | Up to 95% - achieved via synchronous rectification and optimized RDS(ON), minimizing conduction losses in portable power rails. |
| Duty Cycle | 100% - enables ultra-low dropout operation when VIN approaches VOUT, preserving usable battery capacity down to 2.65V. |
Pinout & Package
The LTC1877EMS8#TRPBF is housed in an 8-lead MSOP (MS8) package with exposed pad for thermal enhancement (θJA = 150°C/W). Pin 1 is RUN; Pin 8 is PLL LPF. All pins are surface-mount compatible and require standard reflow profiles per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/disable control input | Pull below 0.4V to enter shutdown (<1μA IQ); pull above 1.2V to enable - prevents floating-state instability. |
| ITH (Pin 2) | Error amplifier compensation node | Controls peak inductor current threshold; nominal 0.5V–1.9V range sets current limit and loop stability. |
| VFB (Pin 3) | Feedback input | Compares resistive divider output against 0.8V reference to regulate VOUT - supports remote sensing for improved load regulation. |
| GND (Pin 4) | Power and signal ground | Common return path for internal circuitry, SW node, and external components - must be low-impedance plane. |
| SW (Pin 5) | Switch node | Connects to drains of internal P- and N-channel MOSFETs - requires tight layout to minimize ringing and EMI. |
| VIN (Pin 6) | Main input supply | Accepts 2.65V–10V; must be decoupled locally with low-ESR ceramic capacitor to suppress switching transients. |
| SYNC/MODE (Pin 7) | Sync clock input / mode select | Tie to VIN for Burst Mode; ground for pulse-skipping; apply 400–700kHz clock for synchronization - disables Burst Mode when active. |
| PLL LPF (Pin 8) | Phase detector output / VCO control | Drives external RC filter to set oscillator frequency during sync; open when unused - critical for PLL lock stability. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 0.65Ω P-MOSFET + 0.75Ω N-MOSFET eliminates external Schottky diode, reducing BOM count and conduction loss. |
| Burst Mode® operation | Reduces IQ to 10μA at light loads while maintaining regulation - ideal for battery-powered standby functions. |
| 100% duty cycle low-dropout | Extends usable battery life by sustaining regulation even as VIN falls to within ~100mV of VOUT. |
| External frequency synchronization | Enables noise-sensitive designs (e.g., audio subsystems) to align switching to system clocks and avoid beat frequencies. |
| Overvoltage & overtemperature protection | OVDET trips at >6.25% VOUT overshoot; thermal shutdown activates at TJ = 125°C - ensures robust field reliability. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core and I/O rails in GSM/UMTS handsets with dual Li-ion cells. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.2V/1.8V/2.8V from 3.0–4.2V battery stack. Use Value: 95% peak efficiency and 10μA quiescent current directly extend talk time and standby duration. | Use Scenario: Supplying LTE modem SoC and RF front-end in portable broadband routers. IC Role / Device Role / Timing Role: High-efficiency intermediate rail generator converting 7.2V battery to 3.3V/5V system bus. Use Value: Synchronizable 550kHz operation avoids interference with cellular band receivers and simplifies EMI filtering. |
| Portable Instruments | Battery-Powered Equipment |
Use Scenario: Regulating analog sensor interface and microcontroller supply in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise, precision buck converter supporting 0.8V reference and remote sensing for <±0.5% load regulation. Use Value: ±2% output accuracy and 100% duty cycle maintain stable ADC reference and analog front-end bias under deep discharge. | Use Scenario: Power management in cordless power tools with 10.8V–12.6V Li-ion packs. IC Role / Device Role / Timing Role: Main DC/DC stage delivering 5V USB host power and 3.3V logic rail from variable battery input. Use Value: Overcurrent foldback and thermal shutdown protect against motor stall conditions and prolonged high-current loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz fixed-frequency, 300mA output, 2.05V–6.5V input, 0.6V reference - higher frequency but lower current and narrower VIN range. | Optimized for ultra-compact footprint and fast transient response in space-constrained wearables; lacks 100% duty cycle and sync capability. | Select when board area is critical and load current ≤300mA; not suitable for 10V input or low-dropout battery end-of-life operation. |
| MP2108DJ-LF-Z | 2.5V–6V input, 600mA, 1.4MHz, 0.8V reference, no sync pin - higher switching frequency but no synchronization or Burst Mode control. | Targets cost-sensitive consumer electronics with simpler enable-only control; missing precision features like ITH compensation and OVDET. | Choose for basic point-of-load conversion where audio noise immunity and advanced protection are non-critical. |
Compared with TPS62231DRVR and MP2108DJ-LF-Z, the LTC1877EMS8#TRPBF provides broader input range (2.65–10V), true 100% duty cycle for extended battery life, and configurable Burst Mode/sync functionality - making it uniquely suited for demanding portable Li-ion systems requiring both efficiency and design flexibility.
Availability
LTC1877EMS8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instruments requiring stable component supply, long-term manufacturability, and guaranteed temperature-grade compliance (–40°C to 85°C).
Supply support for LTC1877EMS8#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC1877EMS8#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-IQ power conversion in battery-powered portable electronics.
FAQ
What is the maximum output current capability of the LTC1877EMS8#TRPBF?
The LTC1877EMS8#TRPBF delivers up to 600mA continuous output current when VIN = 5V, as specified in the Electrical Characteristics table. At lower input voltages (e.g., 2.65V), maximum output current decreases due to increased conduction losses and thermal limits - Figure 1 in the datasheet shows this derating curve. The device also supports short-term peak currents up to 1.25A, limited by internal current-sense thresholds and thermal headroom.
How does the SYNC/MODE pin configure operation modes on the LTC1877EMS8#TRPBF?
The SYNC/MODE pin on the LTC1877EMS8#TRPBF serves dual functions: applying a 400–700kHz external clock enables frequency synchronization, while DC bias selects operating mode - tying to VIN enables Burst Mode® (for lowest IQ), grounding selects pulse-skipping mode (for lower ripple), and leaving unconnected defaults to internal 550kHz PWM. Burst Mode is automatically disabled during synchronization to ensure deterministic timing.
Can the LTC1877EMS8#TRPBF operate with input voltage below 2.65V?
No - the absolute minimum input voltage for the LTC1877EMS8#TRPBF is 2.65V, as defined in Absolute Maximum Ratings and confirmed in Electrical Characteristics. Operation below this threshold risks improper startup, regulation failure, or undefined behavior. For sub-2.65V applications, consider the LTC1878 (optimized for <7V max input) or other ultra-low-VIN regulators such as the LTC3642.
What thermal considerations apply to the LTC1877EMS8#TRPBF in MS8 package?
The LTC1877EMS8#TRPBF in 8-lead MSOP has θJA = 150°C/W. To maintain junction temperature ≤125°C, PCB layout must include adequate copper pour on the exposed pad and inner layers. At 600mA load and 10V input, power dissipation can exceed 500mW - thermal simulation or IR imaging is recommended. Derate output current if ambient exceeds 85°C or if airflow is restricted.
Does the LTC1877EMS8#TRPBF require an external compensation network?
Yes - the LTC1877EMS8#TRPBF requires external compensation via the ITH pin. A Type II or Type III network (typically resistor + capacitor + optional second capacitor) is connected between ITH and GND to stabilize the current-mode control loop. Component values depend on inductor value, output capacitance, and desired phase margin - Linear's application notes (e.g., AN118) provide design equations and example calculations specific to the LTC1877EMS8#TRPBF.
LTC1877EMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product 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)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1877EMS8#TRPBF FAQ
1.How can I place an order for LTC1877EMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1877EMS8#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC1877EMS8#TRPBF reliable?
The price and inventory of LTC1877EMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1877EMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1877EMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1877EMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1877EMS8#TRPBF?
LTC1877EMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1877EMS8#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC1877EMS8#TRPBF?
For technical support, including LTC1877EMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1877EMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1877EMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1877EMS8#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC1877EMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1877EMS8#TRPBF?
All LTC1877EMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1877EMS8#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC1877EMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1877EMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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