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Analog Devices Inc. LTC3727LXEUH-1#TRPBF
- Part No.:
- LTC3727LXEUH-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3727LXEUH-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,896
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Product details
Overview
LTC3727LXEUH-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 LTC3727LXEUH-1#TRPBF datasheet, LTC3727LXEUH-1#TRPBF pinout, LTC3727LXEUH-1#TRPBF application, or LTC3727LXEUH-1#TRPBF equivalent, key selection criteria include its dual-channel current-mode control, OPTI-LOOP® compensation for wide capacitor/ESR tolerance, 120ns minimum on-time, 99% duty cycle dropout capability, and support for both Burst Mode® and forced continuous operation.
Technical Context
The LTC3727LXEUH-1#TRPBF implements a constant-frequency, current-mode architecture with two channels operating 180° out of phase to minimize RMS input current and input capacitor stress. Each channel uses a transconductance error amplifier (gm = 1.3 mmho, GBW = 3 MHz) and precision 0.8V reference with ±1.5% accuracy over temperature.
Its dual-stage gate drivers deliver 3A peak sink/source per TG/BG output with <90ns transition times, while integrated protection includes foldback current limiting, output overvoltage lockout (±7.5% trip), and undervoltage lockout (3.5V–4V). The PLLIN/PLLFLTR interface enables external synchronization or DC voltage-based frequency tuning from 250kHz to 550kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 32V - supports 12V automotive batteries, 24V industrial rails, and wide-input telecom supplies without external pre-regulation. |
| VOUT Accuracy | ±1.5% over temperature - ensures stable regulation for sensitive analog/digital loads without post-conversion trimming. |
| fSW Range | 250kHz to 550kHz, phase-lockable - enables EMI spread-spectrum tuning and synchronization to system clocks or other converters. |
| Min On-Time | 120ns - allows high step-down ratios (e.g., 24V→1.2V at 500kHz) without pulse-skipping instability. |
| Duty Cycle Max | 99% - supports ultra-low dropout operation down to VIN − VOUT ≈ 0.2V, critical for battery-powered systems near end-of-discharge. |
| IQ Shutdown | 20µA - minimizes standby power in always-on subsystems such as automotive infotainment wake logic. |
| Package | 32-pin 5mm × 5mm QFN (UH) with exposed thermal pad - provides low θJA = 34°C/W for high-power density layouts in space-constrained applications. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed SGND pad (Pin 33), rated for –40°C to +85°C operation and 265°C reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOSENSE1 / VOSENSE2 | Remote feedback inputs | Accept resistive divider outputs to regulate each channel's output voltage with ±7.5% PGOOD threshold detection. |
| TG1/TG2, BG1/BG2 | Top/bottom gate drivers | Drive N-MOSFET gates with 3A peak current, floating for high-side (TGx) and ground-referenced for low-side (BGx). |
| SENSE1+/−, SENSE2+/− | Differential current sense inputs | Monitor inductor current via RSENSE to set peak current limit; common-mode range extends to 14V for high-side sensing. |
| PLLIN / PLLFLTR | Phase-locked loop interface | Enable external clock sync (PLLIN) or DC voltage-controlled frequency adjustment (PLLFLTR = 0V–2.4V → 250kHz–550kHz). |
| RUN/SS1 / RUN/SS2 | Soft-start and enable inputs | Capacitor-programmable ramp-up; pulling below 1.0V disables respective channel independently. |
| FCB | Forced continuous/burst mode select | Pulling below 0.8V forces continuous PWM; 0.8V–6.3V enables Burst Mode® for light-load efficiency optimization. |
| PGOOD | Open-drain power-good indicator | Asserts low if either VOSENSE deviates >±7.5% from target - used for system sequencing and fault reporting. |
| INTVCC / EXTVCC | Internal LDO and external bias inputs | INTVCC = 7.5V regulated supply; EXTVCC >7.3V bypasses internal LDO to improve efficiency using secondary winding or output rail. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel control | Reduces RMS input current by up to 39% vs. in-phase dual controllers, enabling smaller input capacitors and lower EMI filter cost. |
| OPTI-LOOP® compensation | Allows stable loop response across ceramic, polymer, and electrolytic output capacitors without external compensation component changes. |
| Adjustable soft-start with independent RUN/SS pins | Enables staggered power-up of dual outputs to limit inrush current and avoid supply sag during system boot. |
| Integrated 3.3V linear regulator (10mA) | Provides clean, low-noise bias for auxiliary circuitry (e.g., ADC references, level shifters) without requiring external LDO. |
| Foldback current limiting & OVP | Protects against short-circuit faults and transient overvoltage events by disabling top FET and activating bottom FET until condition clears. |
Applications
| Telecom Power Distribution | Automotive Infotainment |
|---|---|
Use Scenario: Dual-rail power for baseband processor (1.2V/2A) and RF transceiver (3.3V/1.5A) in 48V telecom shelf systems. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent voltage rails with interleaved switching to suppress conducted EMI on shared 48V backplane. Use Value: Reduces input capacitor count by 40% and eliminates need for ferrite beads on 48V input, lowering BOM cost and board area. | Use Scenario: Powering ADAS camera module (5V/2A) and display driver IC (12V/1.2A) from vehicle 12V battery with cold-crank immunity. IC Role / Device Role / Timing Role: High-efficiency dual buck controller with 99% duty cycle operation maintaining regulation down to 6.5V input during engine cranking. Use Value: Ensures uninterrupted camera video stream and display backlight during 6V battery dips, avoiding system reset or image corruption. |
| Industrial PLC I/O Module | Network Switch ASIC Supply |
Use Scenario: Generating isolated 5V and 3.3V rails for microcontroller and fieldbus transceivers in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Dual-channel controller with independent RUN/SS pins enabling sequenced startup of MCU core before peripheral interfaces. Use Value: Prevents I/O latch-up during power-up by enforcing strict 10ms delay between 3.3V and 5V rail stabilization. | Use Scenario: Supplying 0.85V/40A and 1.2V/25A to multi-core network switch ASIC with tight transient response requirements. IC Role / Device Role / Timing Role: Interleaved dual-phase controller delivering combined 65A with <100ns current sharing skew between phases. Use Value: Achieves <15mV output droop under 30A/µs load step, eliminating need for additional bulk capacitance near ASIC. |
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 |
|---|---|---|---|
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers only; no 3.3V LDO; fixed 500kHz fSW; ±1% VREF accuracy. | Lacks independent RUN/SS control and Burst Mode®; requires external 3.3V LDO for auxiliary bias. | Select when board space is constrained and fixed-frequency operation suffices; not suitable for variable-frequency EMI tuning or low-IQ standby. |
| LTC3855IUH#PBF | Pin-compatible dual-phase controller with same UH package; ±1% VREF; 180ns min on-time; includes PMBus interface. | Supports digital configuration and telemetry but adds complexity; higher cost and larger footprint due to PMBus passives. | Select when remote monitoring, margining, or dynamic voltage scaling is required; otherwise LTC3727LXEUH-1#TRPBF offers simpler analog control and lower cost. |
Compared with MP2918GL-Z, LTC3727LXEUH-1#TRPBF provides superior light-load efficiency via Burst Mode® and integrated 3.3V bias, while compared with LTC3855IUH#PBF it delivers identical analog performance at lower cost and design complexity-ideal for cost-sensitive, high-volume industrial and automotive applications where digital control is unnecessary.
Availability
LTC3727LXEUH-1#TRPBF is available at Aetrix Electronics and suitable for telecom power distribution, automotive infotainment, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3727LXEUH-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 digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC3727LXEUH-1#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding dual-rail, high-current, low-EMI power conversion in space- and thermally-constrained environments.
FAQ
What is the minimum input voltage required for the LTC3727LXEUH-1#TRPBF to start switching?
The LTC3727LXEUH-1#TRPBF features an undervoltage lockout (UVLO) that activates when VIN drops below 3.5V (typical). Startup occurs when VIN rises above 4.0V, ensuring reliable turn-on across temperature and process variation. Below this threshold, all control circuitry, gate drivers, and internal regulators (including the 3.3VOUT LDO) remain disabled to prevent erratic behavior.
Can the LTC3727LXEUH-1#TRPBF operate with only one channel enabled?
Yes, the LTC3727LXEUH-1#TRPBF supports independent channel control: pulling RUN/SS1 low disables Channel 1 while leaving Channel 2 fully operational, and vice versa. This allows flexible power sequencing, partial-system operation during fault conditions, or asymmetric load handling - all without modifying PCB layout or external components.
How does the OPTI-LOOP® compensation in the LTC3727LXEUH-1#TRPBF simplify design versus traditional Type II/III compensation?
The OPTI-LOOP® architecture in the LTC3727LXEUH-1#TRPBF eliminates the need for external compensation networks by embedding adaptive loop gain control within the error amplifier. It automatically adjusts phase margin across ceramic, polymer, and electrolytic output capacitors - enabling stable operation with 10µF to 1000µF COUT and ESR from 0.5mΩ to 100mΩ without resistor/capacitor changes.
What is the purpose of the FCB pin on the LTC3727LXEUH-1#TRPBF, and how should it be configured for optimal light-load efficiency?
The FCB pin on the LTC3727LXEUH-1#TRPBF selects between Burst Mode® (FCB = 0.8V–6.3V) and forced continuous operation (FCB < 0.8V). For optimal light-load efficiency, tie FCB to INTVCC through a 100kΩ resistor and add a 1nF capacitor to ground - this sets ~1.2V, enabling Burst Mode® while preventing noise-induced mode transitions.
Does the LTC3727LXEUH-1#TRPBF provide overvoltage protection, and how does it respond to an output overvoltage event?
Yes, the LTC3727LXEUH-1#TRPBF includes dedicated output overvoltage protection (OVP) that triggers when VOSENSE exceeds ±7.5% of the nominal setpoint. Upon detection, it immediately disables the top gate driver (TG1/TG2) and activates the bottom gate driver (BG1/BG2) to clamp the output, sinking excess current until the fault clears - protecting downstream loads without requiring external crowbar circuits.
LTC3727LXEUH-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- 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:
- 32-QFN (5x5)
LTC3727LXEUH-1#TRPBF FAQ
1.How can I place an order for LTC3727LXEUH-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3727LXEUH-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 LTC3727LXEUH-1#TRPBF reliable?
The price and inventory of LTC3727LXEUH-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 LTC3727LXEUH-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3727LXEUH-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3727LXEUH-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3727LXEUH-1#TRPBF?
LTC3727LXEUH-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3727LXEUH-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 LTC3727LXEUH-1#TRPBF?
For technical support, including LTC3727LXEUH-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3727LXEUH-1#TRPBF requirements.
6.How does Aetrix verify that LTC3727LXEUH-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3727LXEUH-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 LTC3727LXEUH-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3727LXEUH-1#TRPBF?
All LTC3727LXEUH-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3727LXEUH-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 LTC3727LXEUH-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3727LXEUH-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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