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Analog Devices Inc. LTC1627IS8#PBF
- Part No.:
- LTC1627IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1627IS8#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LTC1627IS8#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator IC designed for battery-powered systems. It operates from 2.65V to 8.5V input, delivers up to 500mA output at adjustable VOUT (0.8V–VIN), and features fixed 350kHz switching with external synchronization up to 525kHz. Its Burst Mode operation achieves 96% peak efficiency and 200µA quiescent current-critical for single/dual Li-ion portable instruments and RF modems.
For engineers reviewing the LTC1627IS8#PBF datasheet, LTC1627IS8#PBF pinout, LTC1627IS8#PBF application, or LTC1627IS8#PBF equivalent, key selection criteria 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 support for secondary winding regulation and forced continuous mode.
Technical Context
The LTC1627IS8#PBF 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, 150mV hysteresis), soft-start via external capacitor on RUN/SS, and short-circuit protection with frequency foldback to 35kHz. The SYNC/FCB pin enables three functions: external clock synchronization (385–525kHz), auxiliary winding feedback regulation, and Burst Mode enable/disable via voltage threshold (0.8V).
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 core logic, RF transceivers, and sensor subsystems in portable devices. |
| Switching Frequency | Internally fixed 350kHz (±35kHz) - enables compact 15µH inductors; synchronizable to 385–525kHz for EMI reduction. |
| Reference Voltage | 0.800V ±1.5% - sets output accuracy via external resistor divider; stable over –40°C to 85°C. |
| Quiescent Current | 200µA in Burst Mode - extends battery runtime during light-load standby in wireless modems and scanners. |
| Shutdown Current | 15µA - prevents deep discharge of Li-ion cells when system is powered off. |
| RDS(ON) (P-FET) | 0.7Ω typical at (VIN–VDR)=5V - minimized conduction loss in dropout; bootstrappable via VDR pin for <4.5V operation. |
| Efficiency | Up to 96% at 3.3V/300mA - achieved by synchronous rectification eliminating Schottky diode loss and thermal overhead. |
Pinout & Package
Package: 8-lead plastic SO (SOIC-8), 150 mil width, JEDEC MS-012AC compliant. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC/FCB (Pin 8) | Multifunction control input | Selects Burst Mode (float/high) or forced continuous mode (grounded); accepts external sync clock (385–525kHz); serves as auxiliary winding feedback threshold (0.8V). |
| VDR (Pin 7) | Top driver return | Enables bootstrapping below GND to reduce P-FET RDS(ON) at low VIN; must be grounded for 100% duty cycle operation. |
| VIN (Pin 6) | Main power supply input | Accepts 2.65–8.5V; requires local 22µF/16V ceramic or low-ESR capacitor for high-frequency decoupling. |
| SW (Pin 5) | Switch node | Connects to inductor; carries high dv/dt switching waveform; layout critical for EMI and efficiency. |
| ITH (Pin 1) | Error amplifier compensation point | Controls peak inductor current; voltage range 0–1.2V; used for loop compensation and current limit programming. |
| RUN/SS (Pin 2) | Soft-start and shutdown control | Internal 2.25µA current source charges external CSS; <0.4V forces shutdown (15µA IQ); 0.7V triggers startup. |
| VFB (Pin 3) | Feedback input | Monitors resistive divider output; regulated to 0.800V; enables remote sensing and precise VOUT programming. |
| GND (Pin 4) | Analog and power ground | Common reference for all internal circuitry; must be tied to low-impedance PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P/N-channel MOSFETs eliminate external Schottky diode-reducing BOM count, board area, and forward-voltage loss. |
| Burst Mode operation | Reduces quiescent current to 200µA at light loads while maintaining regulation-extending battery life in intermittent-use applications. |
| 100% duty cycle dropout | Allows VOUT to track VIN down to VOUT + (IOUT × RDS(ON))-enabling operation near end-of-charge in Li-ion systems. |
| Secondary winding regulation | SYNC/FCB pin forces continuous conduction mode when auxiliary output falls, enabling independent regulation of flyback windings. |
| Precision UVLO | 2.5V ±0.15V undervoltage lockout with 150mV hysteresis prevents battery over-discharge and ensures clean startup sequencing. |
| External frequency sync | Accepts TTL/CMOS clock from 385–525kHz-allowing EMI noise spreading and synchronization with system clocks or other converters. |
Applications
| Portable Instrument Power | RF Communication Module |
|---|---|
|
Use Scenario: Powering microcontroller, ADC, and LCD backlight in handheld multimeters or gas detectors with single Li-ion cell. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V/500mA from 2.8–4.2V battery; manages load transients during measurement bursts. Use Value: Burst Mode maintains >85% efficiency at 10mA sleep current, extending battery life beyond 100 hours per charge. |
Use Scenario: Supplying 2.5V to RF transceiver IC (e.g., nRF52840) in Bluetooth LE modules with tight EMI constraints. IC Role / Device Role / Timing Role: Synchronous buck converter synchronized to system clock at 450kHz to shift switching noise away from 2.4GHz ISM band. Use Value: Eliminates need for external Schottky diode and reduces thermal footprint-enabling 4-layer PCB design in 12mm × 16mm module. |
| Distributed Power System | Scanner Imaging Subsystem |
|
Use Scenario: Generating isolated 5V auxiliary rail from main 12V bus using flyback transformer with secondary winding feedback. IC Role / Device Role / Timing Role: Main output regulates primary winding; SYNC/FCB pin monitors secondary winding to force continuous mode and stabilize auxiliary output. Use Value: Enables simultaneous regulation of primary and auxiliary outputs without cross-regulation error-critical for mixed-signal imaging sensors. |
Use Scenario: Powering CCD line sensor and analog front-end in document scanner requiring low-noise, fast transient response. IC Role / Device Role / Timing Role: Buck regulator with soft-start (via 100nF CSS) limits inrush current during scan motor activation; current-mode control ensures <50µs recovery from 0→500mA load step. Use Value: Load-step transient overshoot limited to ±20mV-preventing image artifacts caused by supply droop during pixel readout. |
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 output, 2.05V–6.5V input; smaller 6-pin WSON package; no SYNC/FCB multifunction pin. | Lacks secondary winding regulation and 100% duty cycle; better suited for space-constrained, high-frequency apps where Burst Mode isn't required. | Choose TPS62231DRVR for ultra-compact designs needing >2MHz switching and lower IQ (18µA shutdown), but not for Li-ion dropout or auxiliary winding control. |
| MAX17503GCU+T | 4.5V–60V input, 600mA output, external MOSFETs; includes PMBus interface and comprehensive fault reporting. | Designed for industrial/high-voltage rails; requires external FETs and more complex layout; no integrated synchronous switches. | Choose MAX17503GCU+T for wide-input industrial systems requiring telemetry and robust protection-not for portable battery-powered use cases. |
Compared with TPS62231DRVR and MAX17503GCU+T, the LTC1627IS8#PBF uniquely balances Li-ion input compatibility, integrated synchronous FETs, multifunction SYNC/FCB control, and proven 96% efficiency at 300mA-making it optimal for cost-sensitive, battery-operated RF and instrumentation designs where board space and dropout behavior are critical.
Availability
LTC1627IS8#PBF is available at Aetrix Electronics and suitable for portable instruments, wireless modems, and RF communication modules requiring stable component supply across commercial and industrial temperature ranges (–40°C to 85°C).
Supply support for LTC1627IS8#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 maintains full product support, datasheets, and application notes for the LTC portfolio. Linear pioneered high-performance analog ICs with emphasis on precision power management.
The LTC1627IS8#PBF belongs to Linear's legacy high-efficiency monolithic DC/DC regulator family, engineered specifically for battery-powered portable electronics demanding low IQ, wide input range, and seamless dropout behavior.
FAQ
What is the maximum output current capability of the LTC1627IS8#PBF?
The LTC1627IS8#PBF delivers up to 500mA continuous output current under typical conditions (VIN ≥ 3.6V, TA ≤ 85°C). Peak inductor current is limited by internal current-mode control and drops at higher duty cycles due to slope compensation. At VIN = 2.8V and VOUT = 2.5V, maximum load is ~300mA due to increased conduction losses in the P-channel MOSFET.
How does the SYNC/FCB pin function in the LTC1627IS8#PBF?
The SYNC/FCB pin on the LTC1627IS8#PBF serves three distinct roles: (1) external clock synchronization input (385–525kHz), (2) auxiliary winding feedback threshold (0.8V) to force continuous mode for secondary regulation, and (3) Burst Mode enable/disable control (high/floating = Burst Mode; grounded = forced continuous). These functions are mutually exclusive and determined by external biasing.
Can the LTC1627IS8#PBF operate with a single lithium-ion cell?
Yes-the LTC1627IS8#PBF is explicitly designed for single Li-ion battery operation, supporting input voltages from 2.65V to 4.2V. Its 100% duty cycle capability, 2.5V UVLO threshold with hysteresis, and Burst Mode efficiency down to 200µA make it ideal for maintaining regulation through full battery discharge without external support circuitry.
What is the purpose of the VDR pin on the LTC1627IS8#PBF?
The VDR (top driver return) pin on the LTC1627IS8#PBF allows bootstrapping the gate drive of the internal P-channel MOSFET below ground. When VIN < 4.5V, connecting VDR to a negative charge pump (e.g., via SW node) lowers RDS(ON) and improves efficiency in dropout. Grounding VDR enables 100% duty cycle operation but increases conduction loss at low VIN.
Does the LTC1627IS8#PBF require an external Schottky diode?
No-the LTC1627IS8#PBF integrates both high-side P-channel and low-side N-channel synchronous MOSFETs, eliminating the need for an external Schottky diode. This reduces component count, board area, forward-voltage drop, and associated thermal dissipation-directly contributing to its 96% peak efficiency and simplified layout.
LTC1627IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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):
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1627IS8#PBF FAQ
1.How can I place an order for LTC1627IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1627IS8#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 LTC1627IS8#PBF reliable?
The price and inventory of LTC1627IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1627IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1627IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1627IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1627IS8#PBF?
LTC1627IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1627IS8#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 LTC1627IS8#PBF?
For technical support, including LTC1627IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1627IS8#PBF requirements.
6.How does Aetrix verify that LTC1627IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1627IS8#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 LTC1627IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1627IS8#PBF?
All LTC1627IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1627IS8#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 LTC1627IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1627IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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