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Analog Devices Inc. LTC3727EG-1#PBF
- Part No.:
- LTC3727EG-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3727EG-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:141
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Product details
Overview
LTC3727EG-1#PBF 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 frequencies from 250kHz to 550kHz, and enables high-efficiency dual-rail power conversion for telecom and automotive systems.
For engineers reviewing the LTC3727EG-1#PBF datasheet, LTC3727EG-1#PBF pinout, LTC3727EG-1#PBF application, or LTC3727EG-1#PBF equivalent, key selection criteria include out-of-phase operation for reduced input capacitance, OPTI-LOOP® compensation for wide-output-capacitance compatibility, latched short-circuit shutdown (LTC3727 variant only), and dual 28-pin SSOP packaging with verified thermal resistance θJA = 95°C/W.
Technical Context
The LTC3727EG-1#PBF implements a constant-frequency current-mode architecture with 180° phase separation between its two control channels, minimizing RMS input current and EMI. Its transconductance error amplifiers (gm = 1.3 mmho, GBW = 3 MHz) drive ITH pins to set peak inductor current, while OPTI-LOOP® compensation adapts loop response across varying COUT and ESR values.
It integrates dual gate drivers (TG/BG) with <90 ns transition times, a precision 0.8V reference, 3.3V linear regulator (±2.5% load regulation), and robust protection including output overvoltage lockout (0.84–0.88V), foldback current limiting, and undervoltage lockout (3.5–4V). The RUN/SS pins provide soft-start ramping and-on LTC3727 variants-short-circuit latchoff timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive batteries and wide industrial rails without external pre-regulation. |
| Output Voltage Accuracy | ±1% - ensures stable digital core and I/O rail regulation under line/load/temperature variation. |
| Switching Frequency Range | 250kHz to 550kHz - adjustable via PLLFLTR pin or external sync; enables optimized trade-off between efficiency and component size. |
| Phase Operation | 180° out-of-phase - reduces input capacitor RMS current by ~39% vs. in-phase dual controllers, lowering EMI and cost. |
| Shutdown Quiescent Current | 20μA - enables low-power standby in battery-operated systems without compromising wake-up latency. |
| Current Sense Threshold | 105–165mV - sets precise overcurrent trip point using low-value, low-power sense resistors (e.g., 0.015Ω). |
| Thermal Resistance (θJA) | 95°C/W - defined for 28-lead SSOP package; informs heatsinking requirements for continuous 5A+ per channel operation. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), exposed pad not present - standard surface-mount footprint with θJA = 95°C/W and lead-free #PBF marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (Pins 1, 15) | Soft-start & run control inputs | Capacitor-based ramp controls startup current; also triggers latchoff on sustained overcurrent (LTC3727 only). |
| SENSE1+/SENSE2+, SENSE1−/SENSE2− (Pins 2,14,3,13) | Differential current sense inputs | Measure voltage drop across external RSENSE to regulate peak inductor current per channel. |
| VOSENSE1, VOSENSE2 (Pins 4, 12) | Remote feedback voltage inputs | Accept resistor-divider output voltage for precision 0.8V reference comparison and closed-loop regulation. |
| TG1/TG2, BG1/BG2 (Pins 27,16,23,19) | Top/bottom N-MOSFET gate drivers | Drive external high-side and low-side switches with fast rise/fall times (<90 ns) and 3A peak current capability. |
| PGOOD (Pin 28) | Open-drain power-good indicator | Asserts low when either VOSENSE deviates >±7.5% from setpoint - enables system sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across 10μF–1000μF ceramic or polymer output capacitors without manual compensation redesign. |
| Out-of-Phase Dual Control | Reduces input ripple current amplitude and RMS value, allowing smaller, lower-cost input bulk capacitors and easing EMI filtering. |
| Adjustable Soft-Start | Programmable current ramp via external capacitor prevents inrush current damage during power-up of large output capacitance banks. |
| Foldback Output Current Limiting | Automatically reduces current limit when VOUT drops below 70%, limiting MOSFET power dissipation during short-circuit conditions. |
| Phase-Lockable Oscillator | Accepts external clock on PLLIN or DC voltage on PLLFLTR to synchronize switching frequency - essential for noise-sensitive mixed-signal systems. |
Applications
| Telecom Power Systems | Automotive Infotainment |
|---|---|
Use Scenario: Dual-rail 12V/5V conversion for base station RF modules and optical transceivers requiring low-noise, high-reliability power. IC Role / Device Role / Timing Role: Dual-phase controller managing interleaved buck stages to minimize input ripple and meet stringent conducted EMI limits (CISPR 22 Class B). Use Value: 39% lower RMS input current vs. in-phase design reduces required input capacitance by >50% and eliminates need for expensive low-ESR tantalum banks. | Use Scenario: Power management for head-unit processors, display drivers, and CAN interface ICs in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Primary DC/DC controller delivering regulated 5V and 3.3V rails from wide-range automotive battery (6V–18V cold-crank to load-dump). Use Value: 4V–36V input range and 99% duty-cycle dropout operation maintain regulation during cranking; ±1% accuracy ensures processor stability at temperature extremes. |
| Battery-Powered Test Equipment | Industrial PLC I/O Modules |
Use Scenario: Portable oscilloscope or multimeter with isolated analog front-end and microcontroller subsystems requiring clean, low-noise dual supplies. IC Role / Device Role / Timing Role: Dual synchronous buck controller generating 5V analog and 3.3V digital rails with independent soft-start and PGOOD monitoring. Use Value: Burst Mode® operation achieves <20μA shutdown IQ and extends battery life; 3.3VOUT LDO supplies auxiliary circuitry without extra regulators. | Use Scenario: DIN-rail mounted programmable logic controller with multiple sensor interfaces, communication ports (RS-485, Ethernet), and real-time CPU. IC Role / Device Role / Timing Role: Central power controller delivering 5V for logic and 12V for field-side drivers, with overvoltage protection safeguarding sensitive I/O circuitry. Use Value: Output overvoltage lockout (0.84–0.88V) and latched shutdown prevent damage from feedback divider failure or transient surges on industrial 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 |
|---|---|---|---|
| LTC3727IG-1#PBF | Guaranteed –40°C to +85°C operation; same pinout, features, and specs as LTC3727EG-1#PBF. | Required for extended-temperature industrial or automotive under-hood deployments. | Select LTC3727IG-1#PBF when full industrial temperature qualification and production traceability are mandated. |
| LTC3727EUH-1#PBF | 32-lead 5mm × 5mm QFN package; θJA = 34°C/W; identical functionality but different pin mapping and layout requirements. | Suitable where board space is constrained and thermal performance must be maximized. | Choose LTC3727EUH-1#PBF only when PCB redesign accommodates QFN footprint and exposed pad soldering. |
Compared with LTC3727IG-1#PBF, the LTC3727EG-1#PBF offers identical electrical performance but with commercial-grade temperature assurance (0°C to 85°C); versus LTC3727EUH-1#PBF, it trades superior thermal metrics for legacy SSOP compatibility and no exposed-pad assembly complexity.
Availability
LTC3727EG-1#PBF is available at Aetrix Electronics and suitable for telecom power systems, automotive infotainment units, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for LTC3727EG-1#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 technical and manufacturing continuity for all Linear power products.
The LTC3727 series belongs to Linear's high-performance DC/DC controller product line, designed specifically for multi-phase, high-current, low-voltage power conversion in space-constrained and noise-sensitive applications.
FAQ
What is the key functional difference between LTC3727EG-1#PBF and LTC3727EG#PBF?
The LTC3727EG-1#PBF disables the latched short-circuit shutdown feature present in the base LTC3727EG#PBF. This means LTC3727EG-1#PBF provides foldback current limiting during overloads but will not permanently shut down on sustained short circuits - enabling automatic recovery after fault clearance. Both share identical pinout, compensation, and phase-control architecture.
Does LTC3727EG-1#PBF support synchronization to an external clock source?
Yes, LTC3727EG-1#PBF supports external synchronization via the PLLIN pin (Pin 6). When driven with a clean square wave, the internal oscillator locks to the rising edge of that signal. The phase-locked loop also accepts a DC voltage on PLLFLTR (Pin 5) to set frequency from 250kHz to 550kHz, providing flexible timing control for EMI reduction or system-level clock alignment.
What is the purpose of the FCB pin on LTC3727EG-1#PBF and how should it be configured?
The FCB (Forced Continuous Bias) pin (Pin 7) on LTC3727EG-1#PBF selects operating mode: below 0.8V forces continuous conduction mode (CCM); between 0.8V and VINTVCC–2V enables Burst Mode® for light-load efficiency; above VINTVCC–2V disables Burst Mode and enables constant-frequency PWM. It must never be left floating - tie to GND, VINTVCC, or a resistor divider for deterministic behavior.
Can LTC3727EG-1#PBF drive MOSFETs directly, and what are the gate driver limitations?
Yes, LTC3727EG-1#PBF integrates dual high-current gate drivers: TG1/TG2 (top-side) and BG1/BG2 (bottom-side), each capable of 3A peak sink/source current. Rise/fall times are <90 ns into 3300pF loads. Drivers operate from INTVCC (7.5V), so maximum gate voltage swing is limited to 7.5V - sufficient for most logic-level N-channel MOSFETs but insufficient for high-threshold devices requiring >10V drive.
How does the OPTI-LOOP® compensation on LTC3727EG-1#PBF simplify design compared to traditional Type II/III networks?
OPTI-LOOP® compensation in LTC3727EG-1#PBF replaces external RC networks with an internal transconductance amplifier (gm = 1.3 mmho, GBW = 3 MHz) referenced to the ITH pin. This allows stable loop response across a wide range of output capacitance (10μF–1000μF) and ESR values without manual compensation component selection - significantly reducing design iteration time and improving robustness against capacitor aging or batch variation.
LTC3727EG-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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
LTC3727EG-1#PBF FAQ
1.How can I place an order for LTC3727EG-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3727EG-1#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 LTC3727EG-1#PBF reliable?
The price and inventory of LTC3727EG-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3727EG-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3727EG-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3727EG-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3727EG-1#PBF?
LTC3727EG-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3727EG-1#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 LTC3727EG-1#PBF?
For technical support, including LTC3727EG-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3727EG-1#PBF requirements.
6.How does Aetrix verify that LTC3727EG-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3727EG-1#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 LTC3727EG-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3727EG-1#PBF?
All LTC3727EG-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3727EG-1#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 LTC3727EG-1#PBF part is unused and in its original packaging.
Return procedure for LTC3727EG-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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