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Analog Devices Inc. LTC1877IMS8#PBF
- Part No.:
- LTC1877IMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1877IMS8#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:433
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Product details
Overview
LTC1877IMS8#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator with constant-frequency current-mode control, 2.65V–10V input range, 600mA output capability at 5V input, and 550kHz fixed switching frequency. It integrates P- and N-channel MOSFETs, supports Burst Mode® operation for ultra-low quiescent current (10μA), and delivers up to 95% efficiency in portable Li-ion battery-powered systems.
For engineers reviewing the LTC1877IMS8#PBF datasheet, LTC1877IMS8#PBF pinout, LTC1877IMS8#PBF application, or LTC1877IMS8#PBF equivalent, key selection criteria include its 0.8V feedback reference enabling low-output-voltage designs, 100% duty-cycle low-dropout operation, ±2% output voltage accuracy, and SYNC/MODE pin-controlled mode selection between Burst Mode and pulse-skipping PWM.
Technical Context
The LTC1877IMS8#PBF implements a current-mode buck architecture with internal 0.65Ω P-channel and 0.75Ω N-channel synchronous switches, phase-locked loop (PLL) for external synchronization (400–700kHz), and integrated overcurrent/overtemperature protection. Its ITH pin provides direct error amplifier compensation and peak-current threshold control.
Burst Mode® operation disables automatically during synchronization or when SYNC/MODE is pulled low, eliminating low-frequency ripple in audio-sensitive circuits. The device enters shutdown (<1μA IQ) when RUN pin falls below 0.4V, and features 0.8V reference with ±2% accuracy across –40°C to 85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.65V to 10V - supports single/dual Li-ion battery inputs without external LDO pre-regulation. |
| Output Current | 600mA at VIN = 5V - sufficient for baseband processors, RF transceivers, and sensor subsystems in portable devices. |
| Switching Frequency | 550kHz (fixed), synchronizable 400–700kHz - enables use of compact 10μH inductors and ceramic output capacitors. |
| Quiescent Current | 10μA in operation, <1μA in shutdown - extends runtime in always-on battery-backed applications. |
| Feedback Reference | 0.8V ±2% - allows precise regulation of outputs as low as 0.8V using standard resistor dividers. |
| Efficiency | Up to 95% - achieved via synchronous rectification eliminating Schottky diode losses and low RDS(ON) MOSFETs. |
| Duty Cycle | 100% - maintains regulation down to VIN ≈ VOUT, critical for end-of-battery-life operation. |
| Protection | Overcurrent, overtemperature, and output overvoltage lockout (20–110mV above VFB) - ensures robustness in unattended embedded systems. |
Pinout & Package
The LTC1877IMS8#PBF is housed in an 8-lead MSOP package (3mm × 3mm, 0.65mm pitch) with exposed pad for thermal enhancement. Pin 1 is RUN; Pin 8 is PLL LPF. All pins are surface-mount compatible and require controlled-impedance PCB layout for stable high-frequency operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/disable control input | Pull below 0.4V to enter <1μA shutdown; pull above 1.2V to enable regulation - prevents floating-induced erratic startup. |
| ITH (Pin 2) | Error amplifier output / current limit threshold | Voltage (0.5–1.9V) sets peak inductor current; used for loop compensation and current limiting. |
| VFB (Pin 3) | Feedback node | Connects to resistive divider; regulates output by comparing against 0.8V internal reference. |
| GND (Pin 4) | Analog and power ground | Common return for feedback, error amp, and internal circuitry - must be tied to low-impedance ground plane. |
| SW (Pin 5) | Switch node | Drain connection of internal P- and N-MOSFETs - routes high di/dt switching current; requires tight layout to minimize EMI. |
| VIN (Pin 6) | Main power input | Supplies internal circuitry and high-side switch - requires local 10μF ceramic decoupling to GND (Pin 4). |
| SYNC/MODE (Pin 7) | External 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 | Connect RC filter (e.g., 10kΩ + 2200pF) for sync; open if unused - voltage (0–2.4V) controls oscillator frequency during lock. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Topology | Eliminates external Schottky diode, reducing BOM count and improving efficiency by 5–10% at light loads. |
| Burst Mode® Operation | Reduces quiescent current to 10μA while maintaining regulation - ideal for standby power in IoT edge nodes. |
| 100% Duty-Cycle Capability | Extends usable battery voltage range down to VOUT + IRDS(ON), increasing runtime in single-cell Li-ion systems. |
| Integrated PLL Synchronization | Enables noise-sensitive system-level timing alignment (e.g., with audio codec clocks) without external ICs. |
| ±2% Output Voltage Accuracy | Ensures reliable logic-level compliance for 1.8V/2.5V/3.3V digital rails without post-regulation trimming. |
| Thermal Shutdown Protection | Halts switching at TJ ≥ 125°C - prevents damage during sustained overload or poor heatsinking in sealed enclosures. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core and I/O rails from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.2V/1.8V/2.8V with fast load transient response. Use Value: 95% peak efficiency and 10μA quiescent current extend talk time and standby duration beyond competitive solutions. | Use Scenario: Supplying RF transceiver and digital signal processor in LTE/Wi-Fi modules. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter synchronized to system clock to suppress conducted EMI. Use Value: PLL-sync capability eliminates beat frequencies with RF LO signals, reducing radiated emissions by >6dB. |
| Portable Instruments | Battery-Powered Equipment |
Use Scenario: Regulating analog front-end (AFE), ADC, and microcontroller in handheld test meters. IC Role / Device Role / Timing Role: Low-noise power source with selectable Burst Mode to minimize switching artifacts in precision measurements. Use Value: Pulse-skipping mode option reduces output ripple to <10mVpp, preserving 16-bit ADC SNR performance. | Use Scenario: Providing stable 3.3V rail for Bluetooth SoC and sensors in wearable health monitors. IC Role / Device Role / Timing Role: Compact, thermally robust regulator operating across full battery discharge curve (4.2V → 2.8V). Use Value: 100% duty cycle maintains regulation until battery reaches 3.3V, maximizing usable capacity per charge cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3MHz switching frequency, 300mA output, 2.05–6.5V input, no SYNC pin | Higher frequency enables smaller passives but lower output current and narrower input range | Select for space-constrained, low-power applications where 300mA suffices and external sync is unnecessary |
| MAX17503GEE+T | Adjustable 200kHz–2.2MHz frequency, 2.5A output, 4.5–60V input, external compensation | Wider input range and higher current suit industrial 24V systems, not portable Li-ion | Select for high-voltage, high-current applications requiring design flexibility and ruggedness over portability |
Compared with TPS62231DRYR and MAX17503GEE+T, the LTC1877IMS8#PBF uniquely balances ultra-low quiescent current (10μA), Li-ion-compatible input range (2.65–10V), and integrated SYNC/MODE control - making it optimal for battery life–critical portable electronics where 600mA output and 550kHz operation strike the best size-efficiency trade-off.
Availability
LTC1877IMS8#PBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instruments requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade availability.
Supply support for LTC1877IMS8#PBF 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 continues to develop high-performance power management ICs with emphasis on efficiency, integration, and reliability.
The LTC1877IMS8#PBF belongs to Linear's legacy monolithic DC/DC regulator product line, designed specifically for portable battery-powered applications demanding high efficiency, low IQ, and minimal external components.
FAQ
What is the maximum output current capability of the LTC1877IMS8#PBF?
The LTC1877IMS8#PBF 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 in the internal P-channel MOSFET; Figure 1 in the datasheet shows this derating curve. Thermal limits and PCB copper area also affect achievable current in real-world layouts.
Does the LTC1877IMS8#PBF require an external Schottky diode?
No, the LTC1877IMS8#PBF does not require an external Schottky diode because it integrates both a P-channel high-side and N-channel low-side synchronous MOSFET. This synchronous rectification eliminates diode forward-voltage losses, directly contributing to its 95% peak efficiency and simplifying the bill of materials.
How does the SYNC/MODE pin affect operation of the LTC1877IMS8#PBF?
The SYNC/MODE pin on the LTC1877IMS8#PBF serves dual functions: applying a 400–700kHz external clock enables frequency synchronization, while tying it to VIN selects Burst Mode® operation and grounding it selects pulse-skipping mode. Critically, Burst Mode® is automatically disabled during synchronization to prevent interference with audio circuitry.
What is the purpose of the PLL LPF pin on the LTC1877IMS8#PBF?
Pin 8 (PLL LPF) on the LTC1877IMS8#PBF is the output of the internal phase detector and control input to the voltage-controlled oscillator (VCO). When externally synchronized, an RC low-pass filter (e.g., 10kΩ + 2200pF) is connected here to stabilize the PLL lock; if unused, the pin may be left open. Its voltage (0–2.4V) directly sets the oscillator frequency during lock.
Can the LTC1877IMS8#PBF operate with input voltage below 2.65V?
No, the LTC1877IMS8#PBF has a minimum specified input voltage of 2.65V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this level is not guaranteed and may result in failure to regulate, increased dropout, or undefined behavior. For sub-2.65V applications, consider the LTC1878 or other dedicated low-input regulators.
LTC1877IMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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
LTC1877IMS8#PBF FAQ
1.How can I place an order for LTC1877IMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1877IMS8#PBF 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 LTC1877IMS8#PBF reliable?
The price and inventory of LTC1877IMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1877IMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1877IMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1877IMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1877IMS8#PBF?
LTC1877IMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1877IMS8#PBF 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 LTC1877IMS8#PBF?
For technical support, including LTC1877IMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1877IMS8#PBF requirements.
6.How does Aetrix verify that LTC1877IMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1877IMS8#PBF 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 LTC1877IMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1877IMS8#PBF?
All LTC1877IMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1877IMS8#PBF, 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 LTC1877IMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1877IMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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