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Analog Devices Inc. LTC3727IG-1#TRPBF
- Part No.:
- LTC3727IG-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3727IG-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,555
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Product details
Overview
LTC3727IG-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching regulator controller driving two independent N-channel MOSFET stages. It delivers 0.8V–14V output voltage with ±1% accuracy, operates from 4V–36V input, supports phase-locked 250kHz–550kHz switching, and enables high-efficiency dual-rail power supplies for telecom and automotive systems.
For engineers reviewing the LTC3727IG-1#TRPBF datasheet, LTC3727IG-1#TRPBF pinout, LTC3727IG-1#TRPBF application, or LTC3727IG-1#TRPBF equivalent, key selection criteria include out-of-phase operation for reduced input ripple, OPTI-LOOP compensation for wide capacitor ESR tolerance, dual independent soft-start control, and latchoff-disabled architecture per LTC3727-1 variant.
Technical Context
The LTC3727IG-1#TRPBF implements a constant-frequency current-mode control architecture with two 180° out-of-phase channels, minimizing RMS input current and EMI. Each channel features independent ITH error amplifier outputs, differential current sense inputs (SENSE±), and remote feedback (VOSENSE) with 0.8V reference.
It integrates dual gate drivers (TG/BG) supporting up to 99.4% duty cycle in dropout, a phase-locked loop (PLLIN/PLLFLTR) for external synchronization, forced continuous/burst mode selection via FCB pin, and output overvoltage protection that latches bottom MOSFET on fault.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive batteries and wide industrial input rails |
| Output Voltage Range | 0.8V to 14V - programmable via external resistor divider, precise 0.8V reference enables low-VOUT regulation |
| Output Accuracy | ±1% - ensures stable rail generation under line/load/temperature variation |
| Switching Frequency | 250kHz to 550kHz - adjustable via PLLFLTR voltage or external clock sync on PLLIN |
| Phase Relationship | 180° out-of-phase - reduces input capacitor RMS current by ~38% vs. in-phase dual controllers |
| Operating Temperature | –40°C to +85°C - industrial-grade rating verified across full range per datasheet Note 2 |
| Shutdown Quiescent Current | 20μA - enables ultra-low-power system standby without external enable circuitry |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.3mm × 10.2mm body, 0.635mm pitch. Pin 1 marked with dot; exposed pad not present (unlike QFN variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (Pins 1, 15) | Soft-start timing & run control | Capacitor-to-ground sets ramp time; <1.0V forces shutdown; LTC3727-1 disables latchoff function |
| SENSE1+/SENSE2+, SENSE1–/SENSE2– (Pins 2,14,3,13) | Differential current sense inputs | Measure voltage across RSENSE; set peak current limit with ITH voltage and offset |
| VOSENSE1, VOSENSE2 (Pins 4, 12) | Remote feedback inputs | Connect to output divider midpoint; ±7.5% PGOOD trip threshold referenced to 0.8V |
| ITH1, ITH2 (Pins 8, 11) | Error amplifier outputs | Control current comparator trip point; also used for OPTI-LOOP compensation network |
| TG1, TG2, BG1, BG2 (Pins 27,16,23,19) | Gate drive outputs | TG: floating top-N drivers (INTVCC swing); BG: ground-referenced bottom-N drivers |
| VIN, PGND, SGND (Pins 24, 20, 9) | Main supply, power ground, signal ground | PGND connects to MOSFET sources/Schottky cathodes; SGND must be isolated from PGND |
| PGOOD (Pin 28) | Open-drain status output | Pulled low if either VOSENSE deviates >±7.5%; requires external pull-up to ≤7V |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual control | Reduces input capacitor RMS current by up to 38%, enabling smaller, lower-cost bulk capacitance |
| OPTI-LOOP compensation | Allows stable loop response across wide range of ceramic capacitor ESR (1mΩ–100mΩ) and values (10μF–1000μF) |
| Independent soft-start control | Separate RUN/SS pins allow staggered startup of dual rails to limit inrush and avoid bus droop |
| Phase-lockable oscillator | PLLIN accepts external clock (e.g., system master clock); PLLFLTR enables DC frequency tuning from 250kHz–550kHz |
| Output overvoltage protection | OV comparator latches bottom MOSFET on until VOSENSE returns within ±7.5%, preventing load damage |
Applications
| Telecom Power Systems | Automotive Infotainment |
|---|---|
Use Scenario: Dual-rail 12V/5V conversion in base station power modules with strict EMI limits and high reliability requirements. IC Role / Device Role / Timing Role: Dual-phase controller managing interleaved buck stages to reduce input ripple and meet EN55022 Class B conducted emissions. Use Value: 38% lower input RMS current enables use of 4× smaller 105°C X7R ceramics instead of costly tantalum+aluminum hybrid banks. | Use Scenario: Power management for ADAS camera module requiring clean 5V and 3.3V rails from 9V–16V battery input. IC Role / Device Role / Timing Role: Synchronous buck controller delivering regulated outputs with independent soft-start sequencing to prevent reset glitches during cold crank. Use Value: –40°C to +85°C guaranteed operation ensures reliable startup at –40°C; PGOOD signals MCU only after both rails stabilize within ±7.5%. |
| Battery-Powered Test Equipment | Industrial PLC I/O Modules |
Use Scenario: Portable oscilloscope with dual isolated analog front-end supplies (±12V, +5V) derived from single Li-ion pack. IC Role / Device Role / Timing Role: High-efficiency dual-phase controller operating in Burst Mode at light loads to extend battery runtime. Use Value: 20μA shutdown IQ and selectable low-IQ modes extend 2000mAh battery life to >120 hours in standby. | Use Scenario: DIN-rail mounted PLC with 24VDC input powering isolated 5V logic and 12V analog sensor interfaces. IC Role / Device Role / Timing Role: Robust dual-buck controller handling wide 18V–36V input transients while maintaining tight output regulation. Use Value: 36V absolute max VIN and UVLO at 3.5V ensure operation during 24V brownouts; foldback current limiting protects against shorted field wiring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3727EUH-1#TRPBF | Same electrical specs; 5mm × 5mm QFN-32 package with exposed thermal pad (Pin 33 = SGND) | Superior thermal performance (θJA = 34°C/W vs. 95°C/W); requires PCB thermal vias | Select for higher power density or ambient >70°C; verify layout compatibility with SSOP footprint |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers; 4.5V–36V input; fixed 500kHz freq; no PLL sync | Lacks phase-lock capability and independent RUN/SS; includes PMBus interface for telemetry | Select when digital monitoring is required and external sync is unnecessary; verify current sense resolution matches design needs |
Compared with LTC3727IG-1#TRPBF, the LTC3727EUH-1#TRPBF offers identical functionality in a thermally enhanced QFN package, while MP2918GL-Z trades flexibility (no PLL, no independent soft-start) for integration and telemetry-making it suitable for digitally managed systems where layout space is constrained.
Availability
LTC3727IG-1#TRPBF is available at Aetrix Electronics and suitable for telecom power systems, automotive infotainment units, and battery-powered test equipment requiring stable component supply with guaranteed industrial temperature range operation.
Supply support for LTC3727IG-1#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 supply commitment.
The LTC3727 family targets high-efficiency, multi-rail DC/DC conversion in space-constrained industrial and automotive applications where input ripple reduction, thermal robustness, and precise output regulation are critical.
FAQ
What is the key functional difference between LTC3727IG-1#TRPBF and the base LTC3727 part?
The LTC3727IG-1#TRPBF is the -1 variant, meaning short-circuit latchoff is permanently disabled-unlike the standard LTC3727 which includes timed latchoff triggered via RUN/SS discharge. This simplifies fault recovery in systems where automatic restart is preferred. All other electrical specifications, pinout, and thermal ratings remain identical between LTC3727IG-1#TRPBF and LTC3727IG.
Does LTC3727IG-1#TRPBF support synchronization to an external clock source?
Yes, LTC3727IG-1#TRPBF supports full phase synchronization via the PLLIN pin, which accepts TTL/CMOS-compatible external clocks. The internal oscillator locks to the rising edge of the PLLIN signal, aligning TG1 turn-on precisely. When PLLIN is left open, the PLLFLTR pin pulls low, forcing minimum frequency operation at ~250kHz.
What is the purpose of the FCB pin on LTC3727IG-1#TRPBF, and how does it affect efficiency?
The FCB pin on LTC3727IG-1#TRPBF selects operating mode: below 0.8V forces continuous conduction mode (CCM); between 0.8V and (INTVCC – 2V) enables Burst Mode® for high light-load efficiency; above 7.3V inhibits burst (constant frequency). At 20mA load, Burst Mode reduces quiescent current to ~670μA versus ~2.1mA in CCM-directly extending battery life.
Can LTC3727IG-1#TRPBF drive MOSFETs directly, and what are the gate drive voltage limits?
Yes, LTC3727IG-1#TRPBF integrates dual high-current gate drivers: TG1/TG2 (top-side floating) swing from SWx to (SWx + INTVCC – 0.5V); BG1/BG2 (bottom-side) swing from PGND to INTVCC (7.2V–7.8V). Peak drive current is 3A, with rise/fall times <90ns into 3300pF. BOOSTx pins tolerate up to 42V, enabling high-side drive in 36V-input systems.
How does the OPTI-LOOP compensation on LTC3727IG-1#TRPBF simplify design compared to traditional Type II/III networks?
OPTI-LOOP compensation on LTC3727IG-1#TRPBF uses a single capacitor from ITH to SGND to set dominant pole, eliminating need for complex RC/Zener networks. It automatically adapts loop gain across ceramic capacitor ESR from 1mΩ to 100mΩ-removing iterative stability testing. Designers achieve robust transient response with just one capacitor, reducing BOM count and layout sensitivity.
LTC3727IG-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 30V
- Frequency - Switching:
- 255kHz ~ 530kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3727IG-1#TRPBF FAQ
1.How can I place an order for LTC3727IG-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3727IG-1#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 LTC3727IG-1#TRPBF reliable?
The price and inventory of LTC3727IG-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3727IG-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3727IG-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3727IG-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3727IG-1#TRPBF?
LTC3727IG-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3727IG-1#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 LTC3727IG-1#TRPBF?
For technical support, including LTC3727IG-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3727IG-1#TRPBF requirements.
6.How does Aetrix verify that LTC3727IG-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3727IG-1#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 LTC3727IG-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3727IG-1#TRPBF?
All LTC3727IG-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3727IG-1#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 LTC3727IG-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3727IG-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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