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Analog Devices Inc. LTC3727AEG-1#TRPBF
- Part No.:
- LTC3727AEG-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3727AEG-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:462
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Product details
Overview
LTC3727AEG-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 operates from 4V to 30V input, delivers 0.8V–14V output per channel, supports phase-locked frequencies up to 550kHz, and features out-of-phase operation to reduce input ripple-used in telecom power supplies requiring high-efficiency dual-rail generation.
For engineers reviewing the LTC3727AEG-1#TRPBF datasheet, LTC3727AEG-1#TRPBF pinout, LTC3727AEG-1#TRPBF application, or LTC3727AEG-1#TRPBF equivalent, key selection criteria include its dual-channel 180° interleaved timing, OPTI-LOOP® compensation for wide capacitor/ESR tolerance, ±1% output voltage accuracy, 99% dropout duty cycle, and integrated 3.3V LDO for auxiliary biasing.
Technical Context
The LTC3727AEG-1#TRPBF implements a dual-channel, constant-frequency current-mode control architecture with independent error amplifiers (ITH1/ITH2), differential current sense inputs (SENSE1±/SENSE2±), and 180° phase-shifted switching to minimize input RMS current and EMI. Each channel features dedicated RUN/SS pins, soft-start ramping, and foldback current limiting.
It integrates a phase-locked loop (PLLIN/PLLFLTR) enabling synchronization to external clocks or DC voltage-controlled frequency tuning from 250kHz to 550kHz. Output overvoltage protection (VOVL = 0.84–0.88V) and PGOOD monitoring with ±7.5% trip threshold provide system-level fault resilience without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V (36V absolute max); supports 12V/24V battery systems and industrial rails. |
| Output Voltage Range | 0.8V to 14V per channel; precise 0.8V reference enables low-voltage core supply generation. |
| Switching Frequency | 250kHz to 550kHz; PLL-synchronizable and adjustable via PLLFLTR pin voltage. |
| Output Accuracy | ±1% over temperature; ensures stable regulation for sensitive digital loads like FPGAs and ASICs. |
| Duty Cycle Max | 99.4% in dropout; sustains regulation under extreme VIN-to-VOUT ratios (e.g., 5V out from 5.05V in). |
| Shutdown IQ | 20μA; enables ultra-low-power standby in battery-backed systems. |
| Package | 28-lead SSOP (G package); surface-mount compatible with standard reflow profiles. |
Pinout & Package
28-lead plastic SSOP (G package), 0.635mm pitch, JEDEC MS-012AC compliant. Exposed pad not present; thermal resistance θJA = 95°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (1, 15) | Soft-start & enable control | Capacitor-based ramp sets startup time; <1.0V forces shutdown of respective channel. |
| SENSE1+, SENSE2+ (2, 14) | Current sense positive input | Differential input to current comparator; sets peak inductor current threshold with RSENSE. |
| SENSE1–, SENSE2– (3, 13) | Current sense negative input | Completes differential sense path; common-mode range extends to 14V for high-side sensing. |
| VOSENSE1, VOSENSE2 (4, 12) | Remote feedback input | Accepts resistive divider output; ±7.5% window triggers PGOOD assertion. |
| PLLFLTR (5) | PLL filter / frequency control | DC voltage sets oscillator frequency (0–2.4V → 250–550kHz); 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; 0.8–5.5V enables Burst Mode®; prevents floating via mandatory tie-off. |
| ITH1, ITH2 (8, 11) | Error amplifier output | Control voltage modulates current limit; used for OPTI-LOOP® compensation network connection. |
| SGND (9) | Small-signal ground | Reference for all analog circuits; must be routed separately from PGND to avoid noise coupling. |
| 3.3VOUT (10) | Integrated LDO output | 10mA capable, 3.25–3.45V output; powers bias circuitry or low-current peripherals. |
| PGND (20) | Power ground | Return path for bottom MOSFETs, Schottky anodes, and CIN(–); connects to high-current PCB plane. |
| INTVCC (21) | Internal 7.5V regulator output | Powers gate drivers and logic; bypassed with ≥4.7μF tantalum; switchover to EXTVCC at 7.3V. |
| EXTVCC (22) | External VCC input | Bypasses internal LDO when >7.3V; reduces heat dissipation in high-input-voltage applications. |
| TG1, TG2 (27, 16) | Top gate drivers | Floating outputs; swing = INTVCC – 0.5V above SWx; drive N-MOSFET gates with 50ns rise/fall. |
| BG1, BG2 (23, 19) | Bottom gate drivers | Ground-referenced outputs; swing = 0V to INTVCC; 40ns rise/fall into 3300pF load. |
| VIN (24) | Main input supply | Primary power source; requires local ceramic bypass to SGND near pin. |
| BOOST1, BOOST2 (25, 18) | Bootstrap supplies | Charge pumps for top drivers; connected via capacitor to SWx and Schottky to INTVCC. |
| SW1, SW2 (26, 17) | Switch node connections | Connect to inductor and external Schottky; voltage swings from –0.3V to VIN. |
| PGOOD (28) | Open-drain status indicator | Pulled low if either VOSENSE deviates >±7.5%; requires external pull-up to ≤7V. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase dual-channel operation | Reduces input RMS current by ~39% vs. in-phase dual controllers, enabling smaller input capacitors and lower EMI. |
| OPTI-LOOP® compensation | Allows stable loop response across wide ranges of output capacitance (10μF–1000μF) and ESR (0.5mΩ–50mΩ). |
| Dual independent soft-start | Separate RUN/SS pins enable staggered startup sequencing for multi-rail systems without external timers. |
| Integrated 3.3V/10mA LDO | Eliminates need for external bias rail; supports auxiliary circuitry such as ADC references or level shifters. |
| Programmable operating mode | Select between forced continuous PWM (low-noise), Burst Mode® (high-efficiency light-load), or constant-frequency (EMI-controlled) via FCB pin. |
Applications
| Telecom Power Systems | Automotive Infotainment |
|---|---|
Use Scenario: Dual-rail DC/DC conversion in base station line cards supplying 5V/3A and 12V/4A from 18–28V input. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing interleaved switching with 180° phase offset and PLL synchronization to system clock. Use Value: Reduces input capacitor count by 40% and cuts RMS input current from 2.53A to 1.55A, lowering BOM cost and conducted EMI. | Use Scenario: Power management for head-unit SoC and display backlight in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Dual-output controller generating 1.1V core and 5V peripheral rails with independent soft-start and PGOOD sequencing. Use Value: 99.4% max duty cycle maintains regulation during cold-crank (6.5V battery), while Burst Mode® extends battery runtime at idle. |
| Industrial PLC Modules | High-Density Server VRMs |
Use Scenario: Compact 24V-to-3.3V/5V conversion in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Dual-channel buck controller with integrated 3.3V LDO powering isolated communication interfaces (RS-485, CAN transceivers). Use Value: Eliminates discrete 3.3V regulator, saving 3mm² PCB area; ±1% output accuracy ensures reliable microcontroller operation. | Use Scenario: Secondary-stage voltage regulation feeding FPGA or ASIC cores from intermediate 5V bus. IC Role / Device Role / Timing Role: High-efficiency dual-phase controller delivering 0.85V/20A with OPTI-LOOP® adapting to polymer capacitor aging. Use Value: Interleaving halves input ripple frequency, easing filtering requirements on shared 5V intermediate bus and reducing thermal stress on bulk capacitors. |
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 or PLLIN sync input. | Requires external 3.3V bias; lacks system-level clock synchronization capability for multi-rail coherence. | Choose MP2918GL-Z for cost-sensitive, space-constrained designs where auxiliary LDO and PLL sync are unnecessary. |
| LTC3855EUH#PBF | Single-phase controller with similar voltage range and OPTI-LOOP®, but no second channel or 3.3V LDO. | Requires two ICs to replicate dual-rail functionality; increases layout complexity and component count. | Choose LTC3855EUH#PBF when single-rail design suffices or when channel independence outweighs integration benefits. |
Compared with MP2918GL-Z and LTC3855EUH#PBF, the LTC3727AEG-1#TRPBF uniquely combines dual-phase interleaving, integrated 3.3V LDO, and PLL synchronization in one SSOP package-enabling compact, low-EMI, multi-rail power solutions without external support components.
Availability
LTC3727AEG-1#TRPBF is available at Aetrix Electronics and suitable for telecom power systems, automotive infotainment modules, and industrial PLCs requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LTC3727AEG-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 LTC3727A series belongs to ADI's high-efficiency power management portfolio, designed specifically for demanding dual-rail, high-current DC/DC conversion in space-constrained and thermally sensitive applications.
FAQ
What is the minimum on-time specification for LTC3727AEG-1#TRPBF?
The LTC3727AEG-1#TRPBF has a minimum on-time of 120ns, tested with square-wave input and ≥40% inductor ripple current. This enables high step-down ratios (e.g., 24V to 1.2V at 500kHz) without pulse-skipping artifacts, preserving current-mode stability and transient response integrity in the LTC3727AEG-1#TRPBF.
How does the FCB pin affect operating mode selection in LTC3727AEG-1#TRPBF?
The FCB pin on the LTC3727AEG-1#TRPBF selects between three modes: <0.8V forces continuous PWM, 0.8–5.5V enables Burst Mode®, and >7.3V inhibits Burst Mode® for constant-frequency operation. This pin directly controls both channels simultaneously and must never be left floating to prevent undefined behavior in the LTC3727AEG-1#TRPBF.
Can LTC3727AEG-1#TRPBF operate with input voltages below 4V?
No. The LTC3727AEG-1#TRPBF has a specified minimum input voltage of 4V and an undervoltage lockout (UVLO) threshold of 3.5V (typical). Operation below 4V violates absolute maximum ratings and risks improper gate drive, loss of regulation, or latch-up. Always maintain VIN ≥ 4V for reliable LTC3727AEG-1#TRPBF operation.
What is the purpose of the 3.3VOUT pin on LTC3727AEG-1#TRPBF?
Pin 10 (3.3VOUT) is an integrated 3.3V linear regulator delivering up to 10mA, with ±2.5% load regulation and 0.05–0.3% line regulation. It powers auxiliary circuitry such as level shifters or interface ICs, eliminating the need for an external LDO and reducing BOM count in the LTC3727AEG-1#TRPBF design.
Does LTC3727AEG-1#TRPBF support output voltages higher than 14V?
No. The LTC3727AEG-1#TRPBF is specified for output voltages from 0.8V to 14V per channel, enforced by internal reference and feedback comparator limits. Attempting >14V risks violating VOSENSE input range (0–2.7V) and disables regulation; external resistor dividers cannot extend this range beyond datasheet limits for the LTC3727AEG-1#TRPBF.
LTC3727AEG-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
LTC3727AEG-1#TRPBF FAQ
1.How can I place an order for LTC3727AEG-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3727AEG-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 LTC3727AEG-1#TRPBF reliable?
The price and inventory of LTC3727AEG-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 LTC3727AEG-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3727AEG-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3727AEG-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3727AEG-1#TRPBF?
LTC3727AEG-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3727AEG-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 LTC3727AEG-1#TRPBF?
For technical support, including LTC3727AEG-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3727AEG-1#TRPBF requirements.
6.How does Aetrix verify that LTC3727AEG-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3727AEG-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 LTC3727AEG-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3727AEG-1#TRPBF?
All LTC3727AEG-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3727AEG-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 LTC3727AEG-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3727AEG-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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