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Analog Devices Inc. LT3710EFE#TRPBF
- Part No.:
- LT3710EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3710EFE#TRPBF.pdf
- Description:
- IC SECONDARY SIDE CTRLR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,054
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Product details
Overview
LT3710EFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency synchronous step-down switching regulator controller designed for auxiliary output regulation in isolated DC/DC converters with single secondary winding. It drives dual N-channel MOSFETs, supports up to 500kHz switching frequency, features 0.8V ±1.5% reference voltage, and operates across –40°C to 125°C junction temperature range in auxiliary power rails for telecom and industrial offline supplies.
For engineers reviewing the LT3710EFE#TRPBF datasheet, LT3710EFE#TRPBF pinout, LT3710EFE#TRPBF application, or LT3710EFE#TRPBF equivalent, key selection criteria include its leading-edge PWM modulation synchronized to transformer secondary falling edge, programmable discontinuous conduction mode, dual gate drivers with 6V typical high-side drive, and thermal enhancement via exposed pad TSSOP-16 package.
Technical Context
The LT3710EFE#TRPBF implements voltage-mode PWM control with trailing-edge synchronization and leading-edge modulation to preserve primary-side peak current sensing integrity. Its internal oscillator is reset by the falling edge of the transformer secondary voltage, initiating a new cycle while maintaining compatibility with both single-ended and double-ended isolated topologies.
It integrates two independent amplifiers: a voltage amplifier (VA) with 10MHz gain-bandwidth product and 100dB open-loop gain for fast transient response, and a current limit amplifier (CA1) with 70mV threshold across CL+/CL– pins. The BGS pin enables user-selectable discontinuous conduction mode by monitoring inductor current via an 8mV comparator threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Reference | 0.8V ±1.5% - sets precise output voltage via resistor divider at VFB pin |
| Switching Frequency | Up to 500kHz - programmable via CSET capacitor; enables compact magnetics and high power density |
| Gate Drive Voltage | TGATE/BGATE high = 6V typical - sufficient for robust N-MOSFET turn-on with low RDS(on) selection |
| Current Limit Threshold | 70mV across CL+/CL– - defines overcurrent protection point without external sense resistor scaling |
| Operating Temp Range | –40°C to 125°C - qualified for industrial and telecom power supply environments |
| Package Thermal Resistance | θJA = 38°C/W - enabled by thermally enhanced TSSOP-16 with exposed PGND pad |
| Soft-Start Current | 10µA typical - controls ramp rate of SS pin capacitor for controlled output voltage rise |
Pinout & Package
The LT3710EFE#TRPBF is housed in a 16-lead plastic TSSOP package with exposed thermal pad (Pin 17), which must be soldered to PGND for thermal and electrical performance. Package dimensions: 4.4mm × 5.0mm × 1.1mm height; exposed pad size 3.0mm × 3.0mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (1) | Topside gate driver supply | Bootstrapped from SW node + 8.2V; powers TGATE driver during high-side conduction |
| TGATE (2) | High-side N-MOSFET driver output | Drives gate of top switch; voltage = VSW + 6V typical when active |
| SW (3) | Switch node connection | Connects to inductor and high-side MOSFET source; critical for layout EMI control |
| CSET (4) | Oscillator timing input | Capacitor value sets switching frequency; e.g., 500pF → ~200kHz |
| SYNC (5) | Synchronization input | Falling-edge triggered at 2.5V threshold; aligns switching to transformer secondary waveform |
| ILCOMP (6) | Current limit compensation node | CA1 pulls this node low during overcurrent to regulate peak inductor current |
| SS (7) | Soft-start control | Capacitor here sets output ramp time; 10µA current charges it to 0.8V reference |
| VFB (8) | Voltage feedback input | Inverting input of VA amplifier; regulated to 0.8V for output accuracy |
| BGS (9) | Discontinuous mode enable | Open = DCM enabled via 8mV comparator; grounded = forced CCM |
| VAOUT (10) | Voltage amplifier output | Error amplifier output driving PWM comparator; used for loop compensation |
| CL+ / CL– (11/12) | Current limit sense inputs | Differential pair measuring 70mV threshold across external sense resistor |
| VCC (13) | Main supply input | 8V–24V operation; requires low-ESR bypass capacitor near pin |
| PGND (14) | Power ground return | Return path for bottom MOSFET driver and exposed pad; must tie to PCB ground plane |
| BGATE (15) | Low-side N-MOSFET driver output | Drives gate of bottom switch; voltage = 6V typical relative to PGND |
| GBIAS (16) | Internal 8V regulator output | Bypassed with ≥2.2µF capacitor; supplies BOOST and gate drivers |
| Exposed Pad (17) | Thermal & signal ground | Must be soldered to PGND copper area for thermal dissipation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Leading-edge PWM modulation | Preserves primary-side current sensing integrity in isolated forward/flyback systems |
| Automatic frequency synchronization | Locks to transformer secondary falling edge, eliminating beat frequencies in multi-rail designs |
| User-selectable DCM mode | Improves light-load efficiency by disabling bottom MOSFET when inductor current falls below 8mV threshold |
| Integrated high-speed op-amp | 10MHz GBW and 100dB open-loop gain enable fast transient response and stable loop compensation |
| Programmable soft-start | Controlled 10µA current source charges external capacitor to prevent inrush current on startup |
Applications
| Telecom Power Supplies | Industrial Isolated DC/DC Converters |
|---|---|
Use Scenario: Generating tightly regulated 1.8V/10A auxiliary rail from 36–72V input in half-brick telecom power modules. IC Role / Device Role / Timing Role: Secondary-side synchronous post-regulator controlling buck stage referenced to transformer secondary winding. Use Value: Enables parallel power processing-reducing main output inductor size by 30% versus cascaded topology while achieving <±1.5% output regulation. | Use Scenario: Providing isolated 3.3V/10A and 1.8V/10A outputs in factory automation PLC power subsystems. IC Role / Device Role / Timing Role: Auxiliary output controller synchronized to primary-side LT3781 via transformer secondary waveform. Use Value: Eliminates need for additional secondary windings-cutting transformer complexity and cost while maintaining cross-regulation within ±3%. |
| Offline AC/DC Adapters | Medical Equipment Power Systems |
Use Scenario: Delivering regulated 5V standby and 3.3V logic rails from universal AC input (85–265VAC) using flyback-derived secondary voltage. IC Role / Device Role / Timing Role: Synchronous rectifier controller operating in DCM at light loads to maintain >85% efficiency down to 10% load. Use Value: Reduces heat sink requirements by 40% versus diode rectification-critical for compact enclosed adapters. | Use Scenario: Supplying isolated 2.5V/5A and 1.8V/5A rails for ADC/DAC and FPGA subsystems in diagnostic imaging equipment. IC Role / Device Role / Timing Role: Precision auxiliary regulator with 0.8V ±1.5% reference ensuring stable analog front-end biasing. Use Value: Maintains <100µV RMS output ripple under dynamic load steps-preserving signal integrity in sensitive measurement circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous post-regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3873-5 | Fixed 5V output; no adjustable VREF; lacks SYNC input and BGS-controlled DCM | Designed for fixed-output auxiliary rails only; not suitable for programmable multi-voltage designs | Select LT3710EFE#TRPBF when variable output voltage, transformer synchronization, or light-load DCM optimization is required |
| LM5122 | Wide-input buck controller (3.5–65V); no built-in SYNC interface or secondary-side isolation timing architecture | Intended for primary-side non-isolated or opto-coupled isolated designs-not transformer-falling-edge synchronized | Choose LT3710EFE#TRPBF for direct secondary-side synchronization and minimal component count in transformer-coupled topologies |
Compared with LTC3873-5 and LM5122, the LT3710EFE#TRPBF uniquely combines transformer secondary edge synchronization, programmable DCM, and dual N-MOSFET drive in a single TSSOP package-enabling higher efficiency, smaller magnetics, and tighter cross-regulation in multi-output isolated supplies.
Availability
LT3710EFE#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial isolated DC/DC converters, and offline AC/DC adapters requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3710EFE#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear power products.
The LT3710EFE#TRPBF belongs to Linear's isolated secondary-side controller product line, engineered specifically for high-efficiency auxiliary regulation in single-secondary-winding isolated power supplies-targeting telecom, industrial, and medical applications demanding tight regulation and thermal robustness.
FAQ
What is the maximum allowable voltage on the SYNC pin of the LT3710EFE#TRPBF?
The absolute maximum SYNC pin voltage is 30V. If system conditions require higher voltage, a 10kΩ series resistor must be added between the SYNC source and the LT3710EFE#TRPBF pin to limit current and prevent damage. This requirement is explicitly stated in the Absolute Maximum Ratings table of the official datasheet.
How does the LT3710EFE#TRPBF achieve synchronization with the transformer secondary waveform?
The LT3710EFE#TRPBF synchronizes to the falling edge of the transformer secondary voltage using its SYNC pin, which triggers an internal inverted ramp at a 2.5V threshold. This ensures switching cycles align precisely with transformer reset events-maintaining leading-edge PWM modulation while preserving primary-side current sensing integrity in forward and flyback topologies.
Can the LT3710EFE#TRPBF operate in discontinuous conduction mode (DCM)?
Yes-the LT3710EFE#TRPBF supports user-selectable DCM via the BGS pin. When left open, comparator CA2 monitors inductor current and disables BGATE when the voltage across the sense resistor drops below 8mV, enabling light-load efficiency improvement. Grounding BGS forces continuous conduction mode regardless of load.
What is the purpose of the GBIAS pin on the LT3710EFE#TRPBF?
The GBIAS pin delivers a regulated 8V output that powers the internal gate drivers and bootstraps the BOOST circuitry. It must be bypassed with ≥2.2µF low-ESR capacitor to ground to ensure stable gate drive voltage and minimize switching noise coupling into the control loop of the LT3710EFE#TRPBF.
Is the exposed thermal pad on the LT3710EFE#TRPBF electrically connected to a specific pin?
Yes-the exposed pad (Pin 17) of the LT3710EFE#TRPBF is internally connected to PGND (Pin 14) and must be soldered directly to the PCB's power ground plane. This connection provides both thermal dissipation (θJA = 38°C/W) and low-impedance return path for bottom MOSFET switching currents.
LT3710EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Secondary-Side Controller
- Voltage - Input:
- -
- Voltage - Supply:
- 8V ~ 24V
- Current - Supply:
- 7 mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3710EFE#TRPBF FAQ
1.How can I place an order for LT3710EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3710EFE#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 LT3710EFE#TRPBF reliable?
The price and inventory of LT3710EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3710EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3710EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3710EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3710EFE#TRPBF?
LT3710EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3710EFE#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 LT3710EFE#TRPBF?
For technical support, including LT3710EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3710EFE#TRPBF requirements.
6.How does Aetrix verify that LT3710EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3710EFE#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 LT3710EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3710EFE#TRPBF?
All LT3710EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3710EFE#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 LT3710EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3710EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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