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Analog Devices Inc. LTC3727AIG-1#TRPBF
- Part No.:
- LTC3727AIG-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3727AIG-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,003
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Product details
Overview
LTC3727AIG-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, constant-frequency, current-mode synchronous step-down controller driving two independent N-channel MOSFET stages. It delivers up to 5A and 4A on VOUT1/VOUT2 respectively, supports 4V–30V input, regulates output from 0.8V to 14V with ±1% accuracy, and operates out-of-phase at 250kHz–550kHz to reduce input RMS current and EMI-used in telecom power supplies and automotive infotainment DC/DC conversion.
For engineers reviewing the LTC3727AIG-1#TRPBF datasheet, LTC3727AIG-1#TRPBF pinout, LTC3727AIG-1#TRPBF application, or LTC3727AIG-1#TRPBF equivalent, key selection criteria include its dual-channel phase-interleaved architecture, OPTI-LOOP® compensation for wide COUT/ESR tolerance, 99% dropout duty cycle, integrated 3.3V LDO, and PGOOD monitoring across both outputs.
Technical Context
The LTC3727AIG-1#TRPBF implements a dual-channel, constant-frequency current-mode control loop with 180° phase offset between channels. Each channel features independent ITH error amplifier outputs, differential SENSE+/- current sensing, and VOSENSE feedback with 0.8V precision reference. Its OPTI-LOOP® architecture adapts compensation dynamically across output capacitance and ESR variations.
Phase-lockable oscillator operation (250–550kHz) is controlled via PLLFLTR voltage or external synchronization at PLLIN. The controller integrates dual high-current gate drivers (TG/BG), internal 7.5V INTVCC LDO, 3.3V auxiliary regulator, and protection functions including output overvoltage lockout (±7.5%), current foldback, and undervoltage lockout (4V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V continuous (36V absolute max); supports 12V/24V battery systems and industrial rails. |
| Output Voltage Range | 0.8V to 14V per channel; set by external resistor divider; ±1% regulation accuracy over temp and line. |
| Switching Frequency | 250kHz to 550kHz; adjustable via PLLFLTR pin voltage or external sync at PLLIN; enables EMI optimization. |
| Max Duty Cycle | 99.4% in dropout; allows operation with VIN near VOUT (e.g., 5.5V→5V), minimizing conduction loss. |
| Current Sense Threshold | 105–165mV per channel; sets peak inductor current; supports RSENSE down to ~15mΩ for 5A loads. |
| Shutdown Quiescent Current | 20μA; enables low-power system standby without compromising fast wake-up response. |
| PGOOD Accuracy | ±7.5% window on either VOSENSE pin; open-drain output asserts low if either output deviates beyond spec. |
Pinout & Package
Package: 28-Lead Plastic SSOP (G package), –40°C to +85°C operating temperature range, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (1, 15) | Soft-start & enable control | Capacitor-to-ground sets ramp time; <1.0V forces shutdown of respective channel. |
| SENSE1+, SENSE2+ (2, 14) | Current sense positive input | Differential input to current comparator; referenced to SENSE–; sets trip threshold with RSENSE. |
| SENSE1–, SENSE2– (3, 13) | Current sense negative input | Common-mode range: SGND to 14V; enables high-side or low-side RSENSE placement. |
| VOSENSE1, VOSENSE2 (4, 12) | Feedback voltage input | Remote-sense input for each output; compared to 0.8V reference; enables precision regulation. |
| PLLFLTR (5) | PLL filter / frequency control | DC voltage input (0–2.4V) sets oscillator frequency; also serves as PLL loop filter node. |
| PLLIN (6) | External sync input | 100kΩ internal pull-down; rising edge synchronizes TG1 turn-on; enables multi-controller coherence. |
| FCB (7) | Forced continuous/burst mode select | <0.8V forces continuous PWM; 0.8V–(VINTVCC−2V) enables Burst Mode®; prevents floating. |
| ITH1, ITH2 (8, 11) | Error amplifier output | Compensation node; controls peak inductor current; used for loop stability tuning. |
| SGND (9) | Small-signal ground | Reference for analog circuitry; must be separated from PGND to avoid noise coupling. |
| 3.3VOUT (10) | Auxiliary linear regulator | 10mA capable; powers bias circuitry or low-noise analog ICs; decoupled internally. |
| PGND (20) | Power ground | Return path for bottom MOSFETs, Schottky anodes, and CIN–; connects to high-current PCB plane. |
| INTVCC (21) | Internal 7.5V supply | Output of internal LDO; powers gate drivers and logic; requires ≥4.7μF low-ESR capacitor. |
| EXTVCC (22) | External VCC input | Bypasses internal LDO when >7.3V; improves efficiency by sourcing INTVCC from regulated output. |
| BG1, BG2 (23, 19) | Bottom gate driver output | Drives synchronous N-MOSFET sources; swing: 0V to INTVCC; 3A peak sink/source capability. |
| VIN (24) | Main input supply | Primary power rail; bypassed to SGND; supports up to 36V transient. |
| BOOST1, BOOST2 (25, 18) | Bootstrap supply | Floats above SW nodes; charges external bootstrap capacitors; swing: INTVCC to (VIN + INTVCC). |
| SW1, SW2 (26, 17) | Switch node connection | Connects to inductor high side; voltage swings from −0.3V (Schottky drop) to VIN. |
| TG1, TG2 (27, 16) | Top gate driver output | Floating driver output; swing = INTVCC − 0.5V superimposed on SW node voltage. |
| PGOOD (28) | Power-good indicator | Open-drain output; pulled low if either VOSENSE deviates >±7.5%; requires external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces input RMS current by up to 39% vs. in-phase dual controllers, enabling smaller input capacitors and lower EMI. |
| OPTI-LOOP® compensation | Adapts loop gain dynamically across wide COUT (10μF–1000μF) and ESR (1mΩ–100mΩ) ranges without manual re-tuning. |
| 99.4% maximum duty cycle | Supports ultra-low dropout operation (e.g., 5.1V→5V), maintaining regulation where conventional controllers fail. |
| Integrated 3.3V/10mA LDO | Eliminates need for external bias rail; powers gate driver logic and remote sensing circuitry with low noise. |
| Selectable Burst Mode® or forced continuous | Extends light-load efficiency (e.g., >85% at 10mA) while preserving tight output regulation via hysteretic ITH control. |
| Robust protection suite | Includes output overvoltage lockout (±7.5%), current foldback during short-circuit, and UVLO (4V) with hysteresis. |
Applications
| Telecom Power Supply | Automotive Infotainment System |
|---|---|
Use Scenario: Dual-rail DC/DC conversion in base station line cards requiring 5V @ 5A and 3.3V @ 4A from 12V or 24V backplane. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing interleaved switching, current sharing, and PGOOD sequencing. Use Value: Phase interleaving cuts input ripple current from 2.53ARMS to 1.55ARMS, reducing input capacitor count and EMI filtering cost. |
Use Scenario: Central head-unit power management supplying 12V @ 4A (DSP) and 5V @ 5A (display processor) from 9–16V battery. IC Role / Device Role / Timing Role: High-efficiency dual-output controller with wide VIN range and robust thermal performance in under-hood environments. Use Value: 99.4% duty cycle maintains regulation during cold-crank (6.5V battery), while Burst Mode® extends idle battery life. |
| Industrial PLC I/O Module | Network Router Line Card |
Use Scenario: Isolated 24V-to-5V/3.3V conversion for sensor interface and microcontroller rails in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Dual-channel controller with independent RUN/SS pins enabling staggered startup and fault isolation per rail. Use Value: Independent soft-start and PGOOD per channel simplifies system-level power sequencing and diagnostics. |
Use Scenario: Compact 12V input to 5V/3.3V conversion on dense line cards where board space and thermal density are constrained. IC Role / Device Role / Timing Role: High-frequency (550kHz) dual-phase controller enabling smaller magnetics and reduced footprint vs. single-phase solutions. Use Value: 550kHz operation shrinks inductor size by ~40% versus 300kHz designs, improving power density without sacrificing efficiency. |
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#TRPBF | Same silicon, commercial-grade (0°C to 85°C) temperature range; no guaranteed spec over –40°C. | Suitable for non-automotive, indoor industrial use where ambient stays above 0°C. | Select LTC3727AIG-1#TRPBF for extended temperature reliability; LTC3727EG-1#TRPBF only where cost sensitivity outweighs thermal margin. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers but no 3.3V LDO or PLLIN sync; max fSW = 1MHz; no Burst Mode®. | Used in cost-sensitive consumer power bricks; lacks telecom-grade PGOOD accuracy and phase-sync capability. | Choose MP2918GL-Z only for simple, high-frequency, single-rail applications; LTC3727AIG-1#TRPBF remains superior for multi-rail telecom/automotive systems requiring precision, sync, and auxiliary bias. |
Compared with LTC3727EG-1#TRPBF, the LTC3727AIG-1#TRPBF guarantees full specifications over –40°C to 85°C, critical for automotive and outdoor industrial deployment. Versus MP2918GL-Z, it provides tighter PGOOD accuracy (±7.5% vs. ±10%), external sync capability, and integrated 3.3V bias-enabling simpler, more robust multi-rail designs.
Availability
LTC3727AIG-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, long-term lifecycle support, and guaranteed extended-temperature performance.
Supply support for LTC3727AIG-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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3727AIG-1#TRPBF belongs to ADI's high-efficiency power management portfolio, designed specifically for demanding dual-output, phase-interleaved DC/DC conversion in telecom infrastructure, automotive electronics, and industrial control systems.
FAQ
What is the minimum on-time specification for the LTC3727AIG-1#TRPBF?
The LTC3727AIG-1#TRPBF has a minimum on-time of 120ns, tested with square-wave input and inductor ripple current ≥40% of IMAX. This enables high VIN-to-VOUT conversion ratios (e.g., 24V→1.2V at 550kHz) without pulse-skipping artifacts or regulation loss.
How does the FCB pin affect operating mode in the LTC3727AIG-1#TRPBF?
The FCB pin on the LTC3727AIG-1#TRPBF selects between three modes: <0.8V forces continuous PWM on both channels; 0.8V–(VINTVCC−2V) enables Burst Mode® for light-load efficiency; >VINTVCC−2V disables Burst Mode® and defaults to constant-frequency operation. Leaving FCB floating is prohibited.
Can the LTC3727AIG-1#TRPBF drive MOSFETs with gate charges exceeding 30nC?
Yes-the LTC3727AIG-1#TRPBF's TG/BG drivers deliver 3A peak current and support gate charges up to ~50nC when paired with appropriate external gate resistors and bootstrap components. Rise/fall times remain <90ns with 3300pF load, ensuring efficient switching even with high-Qg MOSFETs.
What is the purpose of the 3.3VOUT pin on the LTC3727AIG-1#TRPBF?
The 3.3VOUT pin on the LTC3727AIG-1#TRPBF provides a regulated 3.3V/10mA auxiliary supply, eliminating the need for a separate LDO. It powers internal logic, remote sensing circuitry, or low-noise analog peripherals-decoupled internally and stable across load and line variations.
Does the LTC3727AIG-1#TRPBF support independent enable and soft-start for each channel?
Yes-the LTC3727AIG-1#TRPBF provides fully independent RUN/SS1 and RUN/SS2 pins. Each accepts a soft-start capacitor to control ramp rate, and pulling either below 1.0V shuts down only its associated channel, enabling staggered startup, fault containment, and flexible power sequencing in multi-rail systems.
LTC3727AIG-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
LTC3727AIG-1#TRPBF FAQ
1.How can I place an order for LTC3727AIG-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3727AIG-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 LTC3727AIG-1#TRPBF reliable?
The price and inventory of LTC3727AIG-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 LTC3727AIG-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3727AIG-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3727AIG-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3727AIG-1#TRPBF?
LTC3727AIG-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3727AIG-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 LTC3727AIG-1#TRPBF?
For technical support, including LTC3727AIG-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3727AIG-1#TRPBF requirements.
6.How does Aetrix verify that LTC3727AIG-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3727AIG-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 LTC3727AIG-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3727AIG-1#TRPBF?
All LTC3727AIG-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3727AIG-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 LTC3727AIG-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3727AIG-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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