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Analog Devices Inc. LTC1627CS8#TRPBF
- Part No.:
- LTC1627CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1627CS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,441
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Product details
Overview
LTC1627CS8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter IC designed for battery-powered systems. It operates from 2.65V to 8.5V input, delivers up to 500mA output at adjustable voltages from 0.8V to VIN, and features fixed 350kHz switching with external synchronization up to 525kHz. Its Burst Mode™ operation achieves up to 96% efficiency at light loads in portable instruments and RF communications equipment.
For engineers reviewing the LTC1627CS8#TRPBF datasheet, LTC1627CS8#TRPBF pinout, LTC1627CS8#TRPBF application, or LTC1627CS8#TRPBF equivalent, key selection considerations include its 8-lead SO package, internal P/N-channel MOSFETs eliminating external Schottky diodes, 100% duty cycle low-dropout capability, ±1.5% reference accuracy, and SYNC/FCB pin dual functionality for auxiliary winding regulation or forced continuous mode.
Technical Context
The LTC1627CS8#TRPBF implements a constant-frequency current-mode control architecture with internal top P-channel and bottom N-channel power MOSFETs. Its error amplifier drives the ITH pin to regulate peak inductor current, while slope compensation prevents subharmonic oscillation above 40% duty cycle.
It integrates undervoltage lockout (2.5V threshold), soft-start via external capacitor on RUN/SS, and short-circuit protection with frequency foldback to ~35kHz. The SYNC/FCB pin enables three functions: secondary winding feedback (0.8V threshold), external clock synchronization (385–525kHz), and Burst Mode enable/disable-grounding it forces continuous conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.65V to 8.5V - supports single/dual Li-ion battery operation without external LDO pre-regulation. |
| Output Current | Up to 500mA - sufficient for powering baseband processors, RF transceivers, and sensor subsystems. |
| Switching Frequency | 350kHz (internal), synchronizable to 385–525kHz - enables use of compact 15µH inductors while reducing EMI in noise-sensitive RF sections. |
| Feedback Reference | 0.800V ±1.5% - enables precise output voltage setting (e.g., 3.3V via 249k/80.6k divider) with minimal drift over temperature. |
| Quiescent Current | 200µA in Burst Mode - extends battery runtime in standby or low-activity states such as idle wireless modems. |
| Shutdown Current | 15µA - prevents deep discharge of lithium-ion cells during system sleep or storage. |
| RDS(ON) (P-FET) | 0.7Ω typical at (VIN–VDR)=5V - combined with bootstrapped VDR, improves efficiency below 4.5V input. |
| Efficiency | Up to 96% at 3.3V/300mA - achieved by synchronous rectification eliminating Schottky forward drop losses. |
Pinout & Package
The LTC1627CS8#TRPBF is housed in an 8-lead plastic SOIC (SO-8) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, and rated for industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - ITH | Error amplifier output / current limit control | Voltage sets peak inductor current; clamped during soft-start; used for loop compensation. |
| 2 - RUN/SS | Enable & soft-start control | Pulling below 0.4V shuts down IC; external capacitor ramps startup current limit linearly from 25mA to full scale. |
| 3 - VFB | Feedback input | Compares resistive divider output against 0.8V reference to regulate VOUT; supports remote sensing. |
| 4 - GND | Power and signal ground | Common return for VIN, SW, and analog circuitry; must be low-impedance connection to minimize noise coupling. |
| 5 - SW | Switch node | Connects to inductor; carries high di/dt square-wave current; requires tight layout to minimize EMI and voltage spikes. |
| 6 - VIN | Main power input | Supplies internal circuitry and power switches; requires local 22µF/16V ceramic or low-ESR capacitor. |
| 7 - VDR | Top driver return | Bootstrappable pin enabling gate drive below ground to reduce RDS(ON) of P-FET at low VIN (e.g., <4.5V). |
| 8 - SYNC/FCB | Multi-function control | Selects Burst Mode (open/high) or forced continuous (grounded); also accepts auxiliary winding feedback for flyback regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing BOM count, board area, and conduction losses by ~0.3V × IOUT. |
| Burst Mode™ operation | Maintains >85% efficiency down to 1mA load, critical for battery life in cellular telephones during standby. |
| 100% duty cycle dropout | Enables regulation when VIN approaches VOUT (e.g., 3.3V out from 3.6V Li-ion), extending usable battery voltage range. |
| Secondary winding regulation | SYNC/FCB pin allows independent regulation of auxiliary outputs in flyback-derived supplies without loading main output. |
| Internal current-mode control | Provides inherent cycle-by-cycle current limiting and superior transient response to load steps (e.g., 500mA step in 25µs). |
| Low-noise shutdown | 15µA supply current in shutdown prevents battery drain in unpowered systems like portable scanners. |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Powering baseband processor and RF front-end from single Li-ion cell (2.8V–4.2V). IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V/500mA with dynamic load handling during call setup and data transmission. Use Value: Burst Mode maintains >90% efficiency at standby currents (<10mA), directly extending talk time and standby duration. | Use Scenario: Supplying precision ADC, microcontroller, and display backlight in handheld multimeters or gas analyzers. IC Role / Device Role / Timing Role: Main system power rail generator with low-noise, tightly regulated output and soft-start to prevent inrush-induced measurement errors. Use Value: ±1.5% reference accuracy and 0.8V feedback threshold ensure consistent 2.5V or 3.3V rail accuracy across temperature, improving measurement repeatability. |
| Wireless Modems | RF Communications |
Use Scenario: Providing clean 1.8V core voltage to WLAN/BT SoC in USB-powered dongles or embedded modules. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator synchronized to system clock (525kHz) to avoid heterodyne interference in 2.4GHz band. Use Value: External synchronization eliminates beat frequencies between switching noise and RF carrier, reducing conducted EMI by >15dB. | Use Scenario: Generating bias rails for LNAs, mixers, and VCOs in SDR transceivers or satellite comms terminals. IC Role / Device Role / Timing Role: Low-quiescent-current buck converter supporting rapid wake-up from ultra-low-power sleep states. Use Value: 200µA quiescent current in Burst Mode enables microamp-level system sleep current, meeting stringent MIL-STD-810G power budget requirements. |
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 max, 2.05V–6.5V input, 0.6V reference, smaller 6-pin WSON package | Better suited for space-constrained, high-frequency designs where size > efficiency at light load | Choose TPS62231DRVR only if PCB area is critical and load rarely drops below 50mA. |
| MAX17503GCU+T | 4.5V–60V input, 600mA, current-mode, integrated MOSFETs, 1.2V reference, 2000kHz max frequency | Designed for industrial/high-voltage inputs; lacks Burst Mode and low-VIN optimization below 4.5V | Select MAX17503GCU+T only when input exceeds 8.5V or wide VIN range is mandatory. |
Compared with TPS62231DRVR and MAX17503GCU+T, the LTC1627CS8#TRPBF uniquely balances ultra-low quiescent current (200µA), robust low-input operation (2.65V), and multi-function SYNC/FCB for auxiliary regulation-making it optimal for dual-rail, battery-first portable RF systems.
Availability
LTC1627CS8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, and wireless modems requiring stable component supply with guaranteed long-term manufacturability and no last-time-buy constraints.
Supply support for LTC1627CS8#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 full product support, datasheets, and application engineering for legacy Linear parts including the LTC1627 series.
The LTC1627CS8#TRPBF belongs to Linear's precision monolithic DC/DC regulator family, engineered specifically for high-efficiency, low-noise power conversion in portable and battery-operated RF and instrumentation systems.
FAQ
What is the minimum input voltage required for LTC1627CS8#TRPBF to operate?
The LTC1627CS8#TRPBF has a specified minimum operating input voltage of 2.65V, verified across the industrial temperature range (–40°C to +85°C). Below this, the undervoltage lockout circuit disables the device to protect lithium-ion batteries from over-discharge. At 2.65V, it can still deliver regulated output in 100% duty cycle dropout mode, making LTC1627CS8#TRPBF suitable for end-of-discharge operation in single-cell systems.
Does LTC1627CS8#TRPBF require an external Schottky diode?
No, the LTC1627CS8#TRPBF does not require an external Schottky diode. It integrates complementary P-channel and N-channel MOSFETs for synchronous rectification, eliminating forward voltage drop losses and associated heat generation. This integration reduces total solution size and improves full-load efficiency by up to 8% compared to asynchronous buck converters using external diodes - a confirmed design feature of LTC1627CS8#TRPBF per its functional diagram and application schematics.
How does the SYNC/FCB pin function in LTC1627CS8#TRPBF?
The SYNC/FCB pin on LTC1627CS8#TRPBF serves three distinct roles: (1) as an auxiliary feedback input for regulating secondary transformer windings (threshold = 0.8V), (2) as an external clock synchronization input (385–525kHz TTL/CMOS), and (3) as a Burst Mode enable/disable control (float/high = Burst Mode, grounded = forced continuous). These functions are mutually exclusive and validated in the LTC1627CS8#TRPBF datasheet's Pin Functions and Applications Information sections.
What is the purpose of the VDR pin on LTC1627CS8#TRPBF?
The VDR pin on LTC1627CS8#TRPBF is the top driver return for the internal P-channel MOSFET gate. When bootstrapped negative relative to GND (e.g., via charge pump tied to SW), it lowers the effective RDS(ON) of the P-FET at low input voltages (<4.5V), improving efficiency by up to 5% in dropout conditions. This functionality is explicitly documented in the LTC1627CS8#TRPBF Applications Information section and Figure 2, and is unique to this variant among similar buck regulators.
Can LTC1627CS8#TRPBF be used in forced continuous conduction mode?
Yes, LTC1627CS8#TRPBF supports forced continuous conduction mode by grounding the SYNC/FCB pin. This overrides Burst Mode operation and ensures uninterrupted switching regardless of load, which is essential for noise-sensitive applications like RF receivers where burst frequency harmonics could interfere with signal integrity. The transition threshold is precisely 0.8V, and this behavior is confirmed in both the Electrical Characteristics table and the Burst Mode Operation section of the LTC1627CS8#TRPBF datasheet.
LTC1627CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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):
- 8.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 8.5V
- Current - Output:
- 500mA
- Frequency - Switching:
- 35kHz ~ 350kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1627CS8#TRPBF FAQ
1.How can I place an order for LTC1627CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1627CS8#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 LTC1627CS8#TRPBF reliable?
The price and inventory of LTC1627CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1627CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1627CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1627CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1627CS8#TRPBF?
LTC1627CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1627CS8#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 LTC1627CS8#TRPBF?
For technical support, including LTC1627CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1627CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1627CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1627CS8#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 LTC1627CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1627CS8#TRPBF?
All LTC1627CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1627CS8#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 LTC1627CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1627CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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