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Analog Devices Inc. LTC3727LXEG-1#TRPBF
- Part No.:
- LTC3727LXEG-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3727LXEG-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3727LXEG-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 for high-efficiency 12V/5V or other dual-output DC/DC conversion. It features ±1.5% output voltage accuracy, 4V–32V input range, 250kHz–550kHz phase-lockable frequency, and out-of-phase operation to reduce input ripple and EMI in telecom and automotive power systems.
For engineers reviewing the LTC3727LXEG-1#TRPBF datasheet, LTC3727LXEG-1#TRPBF pinout, LTC3727LXEG-1#TRPBF application, or LTC3727LXEG-1#TRPBF equivalent, key selection criteria include its dual-channel current-mode control, OPTI-LOOP® compensation for wide output capacitor tolerance, 120ns minimum on-time, and support for forced continuous or Burst Mode® operation across industrial temperature range (–40°C to 85°C).
Technical Context
The LTC3727LXEG-1#TRPBF implements a constant-frequency, current-mode architecture with two independent 180° out-of-phase controllers-each using a transconductance error amplifier (gm = 1.3 mmho, GBW = 3 MHz), precision 0.8V reference, and differential current sensing with 105–165mV adjustable threshold. Its OPTI-LOOP® compensation minimizes required output capacitance while maintaining stability across varying ESR and COUT values.
It integrates dual top/bottom gate drivers (TG1/TG2, BG1/BG2) with 50–90ns transition times, a 7.5V internal LDO (INTVCC), a 3.3V linear regulator (10mA output), and robust protection including overvoltage lockout (±7.5% trip), foldback current limiting, and dropout detection enabling 99% duty cycle operation. Phase synchronization is achieved via PLLIN/PLLFLTR pins with 100kΩ input resistance and ±15µA phase detector current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 32V - supports 12V automotive battery, 24V industrial rails, and wide-input telecom supplies without external pre-regulation. |
| VOUT Accuracy | ±1.5% over temperature - ensures stable regulation for sensitive digital loads like FPGAs and processors requiring tight voltage margins. |
| Switching Frequency | 250kHz to 550kHz, phase-lockable - enables EMI reduction via synchronization to system clock and optimization of magnetics size vs efficiency trade-off. |
| Min On-Time | 120ns - allows high step-down ratios (e.g., 24V→1.2V at 500kHz) without pulse-skipping instability. |
| Current Sense Threshold | 105–165mV - sets peak inductor current with low-loss RSENSE sensing; supports accurate current limiting down to 0.015Ω sense resistors. |
| INTVCC Regulator | 7.5V ±3%, 50mA max - powers gate drivers and internal circuitry; bypassed by EXTVCC ≥7.3V for higher efficiency in self-biased configurations. |
| Thermal Resistance | θJA = 95°C/W (SSOP package) - defines maximum power dissipation before junction exceeds 125°C under standard PCB layout conditions. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), body size 9.9mm × 3.9mm, 0.635mm pitch. Exposed pad not present - thermal path relies on leadframe conduction through PCB copper.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1 (Pin 1) | Soft-start & enable input for Channel 1 | 1.2µA internal current source charges external CSS capacitor; <1.0V forces shutdown; 1.5V threshold enables full-current operation. |
| SENSE1+ / SENSE1– (Pins 2,3) | Differential current sense inputs | Measure voltage across RSENSE to set peak inductor current; common-mode range up to 14V enables high-side sensing. |
| VOSENSE1 (Pin 4) | Remote feedback input for Channel 1 | Connects to resistor divider at VOUT1; internal 0.8V reference enables precise regulation independent of board trace IR drop. |
| PLLFLTR (Pin 5) | PLL loop filter / frequency control node | DC voltage (0–2.4V) sets oscillator frequency; also serves as low-pass filter for phase detector output during synchronization. |
| PLLIN (Pin 6) | External sync input | 50kΩ internal pull-down; rising edge synchronizes TG1 turn-on; enables multi-rail timing coherence in complex power systems. |
| FCB (Pin 7) | Forced continuous mode control | <0.8V forces PWM mode on both channels; >0.8V but |
| ITH1 (Pin 8) | Error amplifier output & compensation node | Controls current comparator threshold; connects to RC network for OPTI-LOOP® compensation tailored to specific COUT/ESR. |
| SGND (Pin 9) | Small-signal ground reference | Must be routed separately from PGND to avoid noise coupling into feedback and current sense paths. |
| 3.3VOUT (Pin 10) | Integrated linear regulator output | Supplies 10mA at 3.3V for biasing optocouplers, level shifters, or auxiliary logic - eliminates need for external LDO. |
| ITH2 (Pin 11) | Error amplifier output for Channel 2 | Independent compensation node; allows asymmetric output configurations (e.g., 12V/5V) with optimized transient response per rail. |
| VOSENSE2 (Pin 12) | Remote feedback input for Channel 2 | Enables independent regulation of second output; supports remote sensing for high-current or long-trace applications. |
| SENSE2– / SENSE2+ (Pins 13,14) | Differential current sense for Channel 2 | Identical function to Channel 1; allows independent current limit setting per phase for unbalanced load designs. |
| PGOOD (Pin 15) | Open-drain power-good indicator | Pulled low if either VOSENSE deviates >±7.5% from target; enables sequencing and fault reporting in multi-rail systems. |
| TG1 (Pin 16) | Top-gate driver output for Channel 1 | Floating driver with swing from SW1 to (VIN + INTVCC); drives high-side N-MOSFET gate via bootstrap capacitor. |
| SW1 (Pin 17) | Switch node for Channel 1 | Connects to inductor and high-side MOSFET drain; voltage swings from ground to VIN; requires low-inductance layout. |
| BOOST1 (Pin 18) | Bootstrap supply for TG1 | Charged via external diode/capacitor during BG1 on-time; provides gate drive voltage above SW1 for N-MOSFET enhancement. |
| BG1 (Pin 19) | Bottom-gate driver for Channel 1 | Drives synchronous rectifier (N-MOSFET source tied to PGND); fast 40–90ns transitions minimize conduction loss. |
| PGND (Pin 20) | Power ground return | Return path for bottom MOSFET sources, Schottky anodes, and CIN negative terminals; must be low-impedance plane. |
| INTVCC (Pin 21) | Internal 7.5V supply output | Powered by internal LDO or external EXTVCC; decoupled with ≥4.7µF tantalum; supplies all gate drivers and analog circuitry. |
| EXTVCC (Pin 22) | External VCC input | When >7.3V, disables internal LDO and connects directly to INTVCC - improves efficiency when powering from regulated output. |
| BG2 (Pin 23) | Bottom-gate driver for Channel 2 | Independent drive for second synchronous rectifier; enables interleaved operation with 180° phase offset for reduced input ripple. |
| VIN (Pin 24) | Main input supply | Primary power input for internal regulators and gate drivers; requires local 10µF ceramic bypass to SGND near pin. |
| BOOST2 (Pin 25) | Bootstrap supply for TG2 | Functionally identical to BOOST1; supports independent high-side drive for second channel. |
| SW2 (Pin 26) | Switch node for Channel 2 | Connects to second inductor and high-side MOSFET; critical for minimizing cross-talk between phases. |
| TG2 (Pin 27) | Top-gate driver for Channel 2 | Floating driver synchronized 180° out-of-phase with TG1 - key to RMS input current reduction and EMI suppression. |
| RUN/SS2 (Pin 28) | Soft-start & enable for Channel 2 | Independent control allows staggered startup or selective shutdown of one output without affecting the other. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input current by up to 39% (e.g., 2.53ARMS → 1.55ARMS), enabling smaller, lower-cost input capacitors and less EMI filtering. |
| OPTI-LOOP® compensation | Allows stable operation with ceramic, polymer, or electrolytic output capacitors - eliminates need for minimum ESR requirements. |
| Adjustable soft-start via RUN/SS pins | Prevents inrush current and output overshoot during startup; independent control per channel enables sequenced power-up. |
| Integrated 3.3V linear regulator | Delivers 10mA at 3.3V with ±2.5% load regulation - powers auxiliary circuits without external regulator or LDO. |
| Phase-lockable oscillator | Supports system-level clock synchronization to suppress beat frequencies and meet strict EMC requirements in dense PCB layouts. |
| Low shutdown IQ (20µA) | Enables always-on monitoring in battery-backed systems; maintains state while drawing negligible standby current. |
Applications
| Telecom Power Supply | Automotive Infotainment System |
|---|---|
Use Scenario: Dual-rail 12V/5V conversion for base station RF modules and backplane interface ICs requiring low-noise, tightly regulated supplies. 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 reduces required bulk capacitance by >50%, cutting BOM cost and board area while improving thermal performance. | Use Scenario: Power management for head unit SoC, display driver, and audio amplifier in 12V vehicle electrical systems with cold-crank (4.5V) and load-dump (32V) transients. IC Role / Device Role / Timing Role: High-vin synchronous controller delivering stable 5V/3A and 12V/4A outputs with ±1.5% accuracy across –40°C to 85°C ambient. Use Value: 99% duty cycle capability maintains regulation during cold-crank; integrated PGOOD enables safe processor reset sequencing during brownout events. |
| Industrial PLC I/O Module | Network Switch Midplane |
Use Scenario: Distributed 5V/12V power for isolated sensor interfaces, ADCs, and microcontrollers in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Dual-output controller with independent RUN/SS and PGOOD signals enabling modular power sequencing and fault isolation per subsystem. Use Value: Independent soft-start prevents current surges during hot-swap insertion; 120ns min on-time supports 24V→3.3V conversion at 500kHz for compact magnetics. | Use Scenario: High-density midplane power delivery for 10/25G Ethernet switch ASICs requiring tightly coupled 0.85V core and 1.2V I/O rails with fast transient response. IC Role / Device Role / Timing Role: Dual-phase controller operating 180° out-of-phase to suppress input ripple feeding shared 48V intermediate bus. Use Value: Interleaving cuts input ripple amplitude by 50% and frequency by 2×, relaxing input filter design and reducing ferrite volume by 30%. |
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 |
|---|---|---|---|
| LTC3727LXEUH-1 | Same die, 32-pin 5mm × 5mm QFN package with exposed thermal pad (θJA = 34°C/W vs 95°C/W); identical electrical specs and pinout except NC pins. | Superior thermal performance for high-power density designs; requires different PCB footprint and reflow profile. | Select LTC3727LXEUH-1 when thermal budget is constrained and board space allows QFN layout; LTC3727LXEG-1 remains optimal for legacy SSOP-compatible designs. |
| LTC3727A-1 | Enhanced version with ±1% VREF accuracy (vs ±1.5%), 120ns min on-time (same), and same 4V–36V VIN range; no latch-off feature. | Higher accuracy needed for precision analog or high-performance computing rails; wider VIN supports 36V industrial inputs. | Choose LTC3727A-1 when ±1% output accuracy is mandatory and 36V max VIN is required; LTC3727LXEG-1 suffices for telecom/automotive where ±1.5% meets spec. |
Compared with LTC3727LXEUH-1 and LTC3727A-1, the LTC3727LXEG-1 offers the lowest cost SSOP solution for dual-phase buck control with verified 4V–32V operation, 120ns on-time, and industrial temperature support - ideal for cost-sensitive, thermally moderate applications where QFN assembly or tighter accuracy aren't required.
Availability
LTC3727LXEG-1#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive infotainment systems, and industrial PLC I/O modules requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for LTC3727LXEG-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3727LXEG-1#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding dual-output, high-current applications in telecom infrastructure, automotive electronics, and industrial automation where reliability, thermal performance, and EMI control are critical.
FAQ
What is the absolute maximum input voltage rating for the LTC3727LXEG-1#TRPBF?
The LTC3727LXEG-1#TRPBF has an absolute maximum input voltage (VIN) rating of 32V. Exceeding this voltage, even momentarily, may cause permanent damage. The device operates over a functional range of 4V to 32V, making it suitable for 12V and 24V automotive and industrial systems with transient tolerance up to 32V.
Does the LTC3727LXEG-1#TRPBF support synchronization to an external clock source?
Yes, the LTC3727LXEG-1#TRPBF supports external synchronization via the PLLIN pin. When an external clock signal is applied, the internal phase-locked loop aligns the rising edge of TG1 to that signal's rising edge. The PLLFLTR pin serves as both the loop filter node and DC frequency control input, allowing frequency tuning from 250kHz to 550kHz.
How does the LTC3727LXEG-1#TRPBF achieve 99% duty cycle operation in dropout?
The LTC3727LXEG-1#TRPBF achieves 99% duty cycle by detecting near-100% on-time operation and inserting a 400ns forced off-time every tenth cycle to recharge the bootstrap capacitor (CB). This dropout detector ensures reliable high-side gate drive even when VIN approaches VOUT, enabling regulation down to VOUT = 0.8V at VIN as low as 4V.
Can the LTC3727LXEG-1#TRPBF operate with only one channel enabled?
Yes, the LTC3727LXEG-1#TRPBF supports independent channel control. Pulling RUN/SS1 low disables Channel 1 while leaving Channel 2 fully operational, and vice versa. Both channels must be disabled to shut down the 7.5V INTVCC and 3.3VOUT regulators. This enables flexible power sequencing and partial-system operation.
What is the purpose of the FCB pin on the LTC3727LXEG-1#TRPBF?
The FCB (Forced Continuous Bias) pin on the LTC3727LXEG-1#TRPBF serves two functions: (1) pulling it below 0.8V forces both channels into continuous PWM mode, eliminating burst-mode ripple; (2) when held between 0.8V and VINTVCC–1V, it enables Burst Mode® operation for improved light-load efficiency. Leaving FCB floating is not allowed.
LTC3727LXEG-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 ~ 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:
- 28-SSOP
LTC3727LXEG-1#TRPBF FAQ
1.How can I place an order for LTC3727LXEG-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3727LXEG-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 LTC3727LXEG-1#TRPBF reliable?
The price and inventory of LTC3727LXEG-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 LTC3727LXEG-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3727LXEG-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3727LXEG-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3727LXEG-1#TRPBF?
LTC3727LXEG-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3727LXEG-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 LTC3727LXEG-1#TRPBF?
For technical support, including LTC3727LXEG-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3727LXEG-1#TRPBF requirements.
6.How does Aetrix verify that LTC3727LXEG-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3727LXEG-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 LTC3727LXEG-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3727LXEG-1#TRPBF?
All LTC3727LXEG-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3727LXEG-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 LTC3727LXEG-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3727LXEG-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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