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Analog Devices Inc. LTC3727EG#PBF
- Part No.:
- LTC3727EG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3727EG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,728
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Product details
Overview
LTC3727EG#PBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching regulator controller driving two independent N-channel MOSFET stages. It delivers precise 0.8V–14V output voltage regulation with ±1% accuracy, operates over 4V–36V input range, supports phase-locked frequencies from 250kHz to 550kHz, and enables high-efficiency dual-rail power conversion for telecom and automotive systems.
For engineers reviewing the LTC3727EG#PBF datasheet, LTC3727EG#PBF pinout, LTC3727EG#PBF application, or LTC3727EG#PBF equivalent, key selection criteria include out-of-phase operation for reduced input ripple, OPTI-LOOP® compensation for wide capacitor ESR tolerance, latched short-circuit shutdown (LTC3727-specific), dual 28-pin SSOP package mapping, and verified compatibility with FDS6680A MOSFETs in 12V/5V converter designs.
Technical Context
The LTC3727EG#PBF implements a constant-frequency current-mode architecture with two channels operating 180° out of phase to minimize RMS input current and EMI. Each channel features independent RUN/SS pins for soft-start and latchoff-triggered shutdown, ITH-controlled peak current limiting, and VOSENSE-based 0.8V reference feedback with ±7.5% PGOOD trip threshold.
It integrates dual gate drivers (TG/BG) with 90ns max transition times, internal 7.5V INTVCC LDO and 3.3V linear regulator (10mA load), PLLIN-synchronized oscillator, and foldback current limiting activated when VOUT drops below 70% nominal. The FCB pin selects between Burst Mode®, forced continuous mode, or secondary winding regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive batteries and wide-input industrial rails without external pre-regulation. |
| Output Voltage Range | 0.8V to 14V - programmable via external resistor divider; enables dual-rail generation (e.g., 12V + 5V) from single input. |
| Output Accuracy | ±1% at TA = –40°C to 85°C - ensures stable system-level voltage margins for DSPs, FPGAs, and microcontrollers. |
| Switching Frequency | 250kHz to 550kHz, phase-lockable - allows synchronization to system clock or noise-sensitive bands; reduces EMI through controlled spectral placement. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation (e.g., 12V→12V at VIN = 12.5V), critical for battery-powered systems near end-of-discharge. |
| Shutdown IQ | 20μA - minimizes standby power loss in always-on subsystems such as telematics or CAN gateway modules. |
| Current Sense Threshold | 105mV to 165mV - sets overcurrent limit via RSENSE; foldback activation at 70% VOUT prevents thermal runaway during shorts. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.3mm × 10.2mm body, 0.635mm pitch. Exposed pad not present - thermal dissipation managed via PCB copper area under SGND/PGND pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (Pins 1, 15) | Soft-start & latchoff control inputs | Capacitor-based ramp controls startup current slew rate; falling edge below 1.0V disables respective channel; >4.5V triggers short-circuit latchoff (LTC3727 only). |
| SENSE1+/SENSE2+, SENSE1–/SENSE2– (Pins 2,3,13,14) | Differential current sense inputs | Measure voltage across RSENSE to set per-channel peak current limit; common-mode range up to 14V supports high-side sensing. |
| VOSENSE1, VOSENSE2 (Pins 4, 12) | Remote feedback voltage inputs | Accept resistive divider output for precision regulation; ±7.5% window defines PGOOD assertion and OVP latch behavior. |
| TG1/TG2, BG1/BG2 (Pins 16,17,19,27) | Top/bottom N-MOSFET gate drivers | Drive external N-ch FETs with 3A peak current; TG swing = INTVCC – 0.5V referenced to SW node; BG swing = 0V to INTVCC. |
| PLLIN, PLLFLTR (Pins 6, 5) | Phase-locked loop interface | PLLIN accepts external sync signal (50kΩ internal termination); PLLFLTR sets oscillator frequency via DC voltage (0–2.4V = 250–550kHz). |
| FCB (Pin 7) | Forced continuous/burst mode select | Voltage <0.8V forces continuous conduction; 0.8–5.5V enables Burst Mode®; >6.8V inhibits burst (constant frequency). |
| PGOOD (Pin 28) | Open-drain power-good indicator | Pulled low if either VOSENSE deviates >±7.5% from 0.8V; 10μs response enables reliable system sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces RMS input current by up to 39% (e.g., 2.53A → 1.55A), enabling smaller input capacitors and lower EMI in space-constrained telecom modules. |
| OPTI-LOOP® compensation | Allows stable loop response across ceramic, polymer, and electrolytic output capacitors with ESR from 1mΩ to 100mΩ - eliminates need for custom compensation networks. |
| Latched short-circuit shutdown | Auto-shutdown on sustained overcurrent (e.g., >100ms at 70% VOUT), preventing MOSFET thermal failure; reset via RUN/SS pin recycle - no manual intervention required. |
| Dual independent soft-start | Separate RUN/SS pins enable staggered startup of 12V and 5V rails to avoid inrush current stacking - essential for multi-rail FPGA power supplies. |
| Integrated 3.3V/10mA linear regulator | Provides clean bias for ADC references or level-shifters without external LDO - reduces BOM count and layout area in embedded controllers. |
Applications
| Telecom Power Supply | Automotive Infotainment |
|---|---|
Use Scenario: Dual-output 12V/5V converter powering baseband processor and RF transceiver in 4G/LTE small cell radio. IC Role / Device Role / Timing Role: Dual-phase controller managing interleaved switching to suppress conducted EMI below EN301 489 limits while delivering 5A/4A loads. Use Value: 39% lower RMS input current reduces 12V rail ripple by 42%, eliminating need for costly shielded inductors and meeting stringent FCC Class B emissions. | Use Scenario: Central infotainment head unit requiring isolated 12V (display backlight) and 5V (SoC core) rails from 9–16V battery input. IC Role / Device Role / Timing Role: Phase-locked dual controller synchronizing to CAN bus clock to avoid beat frequencies with vehicle network timing. Use Value: Out-of-phase operation cuts input capacitor size by 50% (from 2×47μF to 1×47μF), saving PCB area in tight dashboard layouts. |
| Battery-Powered Test Equipment | Industrial PLC I/O Module |
Use Scenario: Portable oscilloscope with Li-ion battery (8.4V–12.6V) powering 3.3V analog front-end and 5V digital logic. IC Role / Device Role / Timing Role: High-efficiency dual controller using Burst Mode® at light load (<50mA) to extend runtime; forced continuous mode during acquisition bursts. Use Value: 20μA shutdown IQ and 99.4% duty cycle enable >12hr operation on 4000mAh battery; FCB pin toggles modes without firmware overhead. | Use Scenario: DIN-rail mounted PLC module converting 24VDC field supply to regulated 12V (relay drivers) and 5V (microcontroller) outputs. IC Role / Device Role / Timing Role: Robust controller with latched short-circuit protection safeguarding against wiring faults in harsh factory environments. Use Value: Automatic shutdown on sustained overload prevents field-replacement of damaged MOSFETs; RUN/SS discharge current (0.5–4μA) sets precise fault timeout via standard 100nF capacitor. |
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 |
|---|---|---|---|
| LTC3727IG-1 | Same functionality but specified for –40°C to 85°C industrial temperature range; G-package SSOP; no latched shutdown (LTC3727-1 variant). | Used where extended temp qualification is required but short-circuit latchoff is unnecessary (e.g., non-safety-critical industrial sensors). | Select LTC3727IG-1 when AEC-Q100 or extended temp validation is mandatory and latchoff is not needed. |
| LTC3727EUH-1 | Identical electrical specs but in 5mm × 5mm QFN (UH) package with exposed thermal pad; θJA = 34°C/W vs 95°C/W for SSOP. | Preferred for high-density, thermally constrained designs like automotive ADAS ECUs where board space and junction temperature are critical. | Choose LTC3727EUH-1 when thermal performance or footprint reduction outweighs SSOP rework compatibility. |
Compared with LTC3727IG-1, the LTC3727EG#PBF offers guaranteed latchoff protection for safety-critical overcurrent events; versus LTC3727EUH-1, it trades superior thermal resistance for legacy SSOP assembly compatibility and lower cost in medium-power telecom applications.
Availability
LTC3727EG#PBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive infotainment systems, and battery-operated test equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3727EG#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. (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 LTC3727EG#PBF belongs to ADI's Power by Linear™ controller family, engineered specifically for high-efficiency, multi-phase DC/DC conversion in space- and thermal-constrained applications where input ripple, EMI, and reliability are critical design parameters.
FAQ
What is the maximum supported input voltage for the LTC3727EG#PBF?
The LTC3727EG#PBF supports an absolute maximum input voltage of 36V on the VIN pin. Continuous operation is rated from 4V to 36V, making it suitable for 24V industrial buses and 12V automotive systems with load-dump transients. Exceeding 36V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3727EG#PBF support phase synchronization with an external clock?
Yes, the LTC3727EG#PBF supports full phase synchronization via its PLLIN pin. When an external clock signal is applied, the internal oscillator locks to its rising edge, aligning TG1 turn-on precisely. The PLLFLTR pin provides DC voltage control (0–2.4V) for frequency tuning between 250kHz and 550kHz, enabling noise-sensitive system-level timing coordination.
How does the latched short-circuit shutdown function on the LTC3727EG#PBF?
The LTC3727EG#PBF implements latched short-circuit shutdown exclusively on its RUN/SS pins. If VOSENSE drops below 70% of nominal for longer than the time set by the RUN/SS capacitor (e.g., 100nF ≈ 100ms), the controller shuts down and holds off until RUN/SS is cycled low-then-high. This feature is absent in LTC3727-1 variants and is confirmed in the datasheet's "PART NUMBER FUNCTION" table.
Can the LTC3727EG#PBF drive both high-side and low-side N-channel MOSFETs?
Yes, the LTC3727EG#PBF integrates dual high-current gate drivers: TG1/TG2 for top-side N-MOSFETs (floating, bootstrapped) and BG1/BG2 for bottom-side N-MOSFETs (ground-referenced). Each driver delivers 3A peak current, supporting FDS6680A and similar logic-level devices as validated in the typical application circuit (Figure 1).
What is the purpose of the FCB pin on the LTC3727EG#PBF?
The FCB pin on the LTC3727EG#PBF serves three functions: (1) forcing continuous conduction mode when pulled <0.8V, (2) enabling Burst Mode® operation between 0.8V–5.5V, and (3) regulating a secondary winding by temporarily synchronizing both controllers. Leaving FCB floating is prohibited; it must be pulled to a defined voltage or grounded per the Applications Information section.
LTC3727EG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- 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 ~ 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
LTC3727EG#PBF FAQ
1.How can I place an order for LTC3727EG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3727EG#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 LTC3727EG#PBF reliable?
The price and inventory of LTC3727EG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3727EG#PBF is usually 5 days.
3.What payment methods are accepted for LTC3727EG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3727EG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3727EG#PBF?
LTC3727EG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3727EG#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 LTC3727EG#PBF?
For technical support, including LTC3727EG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3727EG#PBF requirements.
6.How does Aetrix verify that LTC3727EG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3727EG#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 LTC3727EG#PBF meets industry standards.
7.What is the process for return or replacement of LTC3727EG#PBF?
All LTC3727EG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3727EG#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 LTC3727EG#PBF part is unused and in its original packaging.
Return procedure for LTC3727EG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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