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Analog Devices Inc. LTC3727LXEUH-1#PBF
- Part No.:
- LTC3727LXEUH-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3727LXEUH-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,912
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Product details
Overview
LTC3727LXEUH-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 for high-efficiency 12V/5V or other dual-rail DC/DC conversion. It features ±1.5% output voltage accuracy, 4V–32V input range, 250kHz–550kHz phase-lockable frequency, and 99% duty cycle dropout capability - deployed in telecom power supplies and automotive infotainment systems.
For engineers reviewing the LTC3727LXEUH-1#PBF datasheet, LTC3727LXEUH-1#PBF pinout, LTC3727LXEUH-1#PBF application, or LTC3727LXEUH-1#PBF equivalent, key selection considerations include out-of-phase current mode control, OPTI-LOOP® compensation for wide COUT/ESR tolerance, dual 3.3V linear regulator output, and thermal performance enabled by its 5mm × 5mm QFN package with exposed SGND pad.
Technical Context
The LTC3727LXEUH-1#PBF implements a constant-frequency, current-mode architecture with two channels operating 180° out of phase to minimize input ripple and EMI. Each channel uses a transconductance error amplifier (gm = 1.3 mmho, GBW = 3 MHz) and precision 0.8V reference to regulate VOSENSE1/2 with ±1.5% accuracy over temperature.
Its dual gate drivers support TG/BG timing with ≤90ns rise/fall times and 90ns dead-time control; the PLLIN/PLLFLTR interface enables external synchronization or DC voltage-based frequency tuning from 220kHz to 580kHz; and integrated protection includes foldback current limiting, output overvoltage lockout (±7.5%), and undervoltage lockout at 3.5V–4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 32V - supports 12V/24V automotive batteries and telecom -48V derived rails via intermediate regulation. |
| VOUT Accuracy | ±1.5% over full temperature range - ensures stable microprocessor core and I/O rail regulation without calibration. |
| Switching Frequency | 250kHz to 550kHz, phase-lockable - enables EMI reduction via spread-spectrum sync or fixed-frequency noise shaping. |
| Duty Cycle Max | 99.4% - sustains regulation down to VOUT ≈ VIN − 0.3V, critical for low-dropout operation in battery-powered systems. |
| ITH Transconductance | 1.3 mmho - defines loop gain stability margin when compensating with OPTI-LOOP® across ceramic capacitor ESR variations. |
| PGOOD Threshold | ±7.5% on VOSENSE - provides reliable power sequencing signal for FPGA or ASIC startup without external monitoring circuitry. |
| INTVCC Regulator | 7.5V LDO with 1.0% load regulation - powers gate drivers and internal logic while supporting EXTVCC switchover above 7.3V for efficiency optimization. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed SGND pad (Pin 33), θJA = 34°C/W - optimized for high-power density and thermal reliability in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOSENSE1 / VOSENSE2 | Remote feedback inputs | Accept resistive divider voltage from each output rail; enable precise regulation independent of PCB trace IR drop. |
| TG1/TG2, BG1/BG2 | Top/bottom N-MOSFET gate drivers | Deliver 3A peak current with ≤90ns transition times; support bootstrap (TG) and ground-referenced (BG) drive topologies. |
| SENSE1+/−, SENSE2+/− | Differential current sense inputs | Measure RSENSE voltage drop to set peak inductor current; tolerate common-mode up to 14V for high-side sensing. |
| PLLIN / PLLFLTR | Phase-locked loop interface | Enable external clock sync (PLLIN) or DC voltage-controlled frequency tuning (PLLFLTR) across 220–580kHz range. |
| FCB | Forced continuous/burst mode select | Pull below 0.8V for forced PWM; float or bias 0.8–6.3V for Burst Mode® - directly controls light-load efficiency strategy. |
| 3.3VOUT | Integrated linear regulator output | Supplies 10mA DC (50mA peak) for biasing optocouplers, level shifters, or auxiliary logic - eliminates external LDO. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual control | Reduces RMS input current by up to 39% vs single-phase - cuts input capacitor size/cost and lowers conducted EMI without shielding. |
| OPTI-LOOP® compensation | Enables stable loop response across 10µF–1000µF ceramic output capacitors with ESR from 0.5mΩ to 50mΩ - simplifies layout and BOM. |
| 99% duty cycle dropout | Maintains regulation when VIN drops within ~300mV of VOUT - extends runtime in deep battery discharge conditions. |
| Integrated 3.3V/10mA LDO | Eliminates need for external bias supply for gate drivers, level translators, or monitoring ICs - reduces component count and board area. |
| Programmable soft-start | Adjustable ramp time via RUN/SS capacitor - prevents inrush current damage to input capacitors and MOSFETs during power-up. |
Applications
| Telecom Power Supply | Automotive Infotainment |
|---|---|
Use Scenario: Dual-rail 12V/5V conversion from -48V or 24V intermediate bus in base station line cards. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing parallel power stages with interleaved switching to reduce input ripple. Use Value: Low RMS input current (1.55ARMS vs 2.53ARMS single-phase) enables smaller, lower-cost bulk capacitors and meets EN55022 Class B conducted EMI limits. | Use Scenario: Power management for head unit DSP, display backlight, and USB peripherals in 12V vehicle electrical system. IC Role / Device Role / Timing Role: High-efficiency dual-output controller delivering regulated 5V (3A) and 12V (4A) with thermal robustness under engine cranking (VIN = 6V). Use Value: 99% duty cycle operation sustains 5V output during cold-crank events; Burst Mode® maintains <20µA quiescent current in standby. |
| Industrial PLC I/O Module | Network Switch PoE Midspan |
Use Scenario: Isolated 5V/3.3V rails for microcontroller, ADC, and digital I/O in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Dual-channel controller with remote sensing (VOSENSE) ensuring tight regulation despite PCB trace resistance in modular backplane designs. Use Value: ±1.5% output accuracy and ±7.5% PGOOD threshold guarantee deterministic startup and fault detection for safety-critical firmware execution. | Use Scenario: Auxiliary power for PoE midspan switch management MCU and PHY interfaces, fed from 48V PoE input. IC Role / Device Role / Timing Role: Synchronous buck controller converting 48V to 12V/5V with FCB pin used to force continuous mode during PoE negotiation bursts. Use Value: Forced continuous operation via FCB prevents output droop during high-pulse-load PoE classification cycles; OPTI-LOOP® accommodates wide-range output capacitance. |
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 |
|---|---|---|---|
| LTC3727EG-1 | 28-lead SSOP package (θJA = 95°C/W); no integrated 3.3V LDO; identical electrical specs. | Suitable for cost-sensitive, lower-power designs where thermal budget allows larger footprint and external bias required. | Select when board space permits SSOP and 3.3V bias is available elsewhere; avoid for thermally constrained QFN-only layouts. |
| MP8772GQ-Z | Single-chip dual-phase controller with integrated MOSFETs; max VIN = 28V; no PLL sync or OPTI-LOOP®. | Better for compact, low-component-count designs where 28V input limit is acceptable and external sync not needed. | Choose for simplified design with integrated power stage; not suitable for >28V input or applications requiring frequency locking to system clock. |
Compared with LTC3727EG-1, the LTC3727LXEUH-1#PBF offers superior thermal performance and integrated 3.3V bias, while MP8772GQ-Z trades flexibility for integration - making LTC3727LXEUH-1#PBF optimal for high-reliability, thermally demanding dual-rail systems with strict input voltage or sync requirements.
Availability
LTC3727LXEUH-1#PBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive infotainment systems, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3727LXEUH-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3727LXEUH-1#PBF belongs to Linear's high-efficiency DC/DC controller product line, designed specifically for dual-phase, interleaved synchronous buck conversion in space-constrained, thermally demanding applications like telecom infrastructure and automotive electronics.
FAQ
What is the minimum input voltage for reliable operation of the LTC3727LXEUH-1#PBF?
The LTC3727LXEUH-1#PBF has an undervoltage lockout (UVLO) threshold of 3.5V to 4V, meaning it will not start switching until VIN exceeds approximately 3.5V. Below this, the controller remains in shutdown with only 20µA quiescent current. This ensures clean startup and avoids erratic behavior during brownout conditions - critical for automotive and battery-backed systems where LTC3727LXEUH-1#PBF is commonly deployed.
How does the OPTI-LOOP® compensation in the LTC3727LXEUH-1#PBF improve design flexibility?
OPTI-LOOP® compensation in the LTC3727LXEUH-1#PBF allows stable closed-loop response across a wide range of output capacitor values (10µF–1000µF) and ESR (0.5mΩ–50mΩ), eliminating the need for precise capacitor selection or complex compensation networks. This means designers can use low-cost ceramic capacitors without sacrificing transient response - a key advantage in high-density layouts where LTC3727LXEUH-1#PBF is often selected for dual-rail power delivery.
Can the LTC3727LXEUH-1#PBF operate with only one channel active?
Yes, the LTC3727LXEUH-1#PBF supports independent channel control: pulling RUN/SS1 low disables Channel 1 only, while RUN/SS2 controls Channel 2. Both channels can be operated simultaneously, individually, or in staggered startup sequences. This flexibility enables asymmetric rail generation (e.g., 12V/5V) and partial-system power-down - a feature leveraged in multi-voltage FPGA power trees using LTC3727LXEUH-1#PBF.
What is the function of the FCB pin on the LTC3727LXEUH-1#PBF, and how does it affect efficiency?
The FCB (Forced Continuous/Burst Mode) pin on the LTC3727LXEUH-1#PBF selects between forced continuous PWM (FCB < 0.8V) and Burst Mode® operation (FCB = 0.8V–6.3V). In Burst Mode®, LTC3727LXEUH-1#PBF skips switching cycles at light loads, reducing quiescent current to ~20µA and improving light-load efficiency - essential for always-on automotive modules where LTC3727LXEUH-1#PBF delivers regulated 5V/12V rails.
Does the LTC3727LXEUH-1#PBF include built-in overvoltage protection, and how does it trigger?
Yes, the LTC3727LXEUH-1#PBF includes dedicated output overvoltage protection (OVP) that triggers when either VOSENSE1 or VOSENSE2 deviates by more than ±7.5% from its nominal setpoint. Upon detection, the top MOSFET is immediately turned off and the bottom MOSFET is activated to clamp the output, preventing damage to downstream loads. This fast-acting OVP is integral to LTC3727LXEUH-1#PBF's safety-critical deployment in telecom and industrial power systems.
LTC3727LXEUH-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- 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 ~ 28V
- 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:
- 32-QFN (5x5)
LTC3727LXEUH-1#PBF FAQ
1.How can I place an order for LTC3727LXEUH-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3727LXEUH-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 LTC3727LXEUH-1#PBF reliable?
The price and inventory of LTC3727LXEUH-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 LTC3727LXEUH-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3727LXEUH-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3727LXEUH-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3727LXEUH-1#PBF?
LTC3727LXEUH-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3727LXEUH-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 LTC3727LXEUH-1#PBF?
For technical support, including LTC3727LXEUH-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3727LXEUH-1#PBF requirements.
6.How does Aetrix verify that LTC3727LXEUH-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3727LXEUH-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 LTC3727LXEUH-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3727LXEUH-1#PBF?
All LTC3727LXEUH-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3727LXEUH-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 LTC3727LXEUH-1#PBF part is unused and in its original packaging.
Return procedure for LTC3727LXEUH-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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