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Analog Devices Inc. LT3724IFE#TRPBF
- Part No.:
- LT3724IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3724IFE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,546
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Product details
Overview
LT3724IFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode DC/DC controller IC for medium-power nonsynchronous buck, boost, inverting, and SEPIC converters. It operates from 4V to 60V input, delivers up to 36V output in step-down mode, features 200kHz fixed-frequency operation, ±1.3% reference accuracy, and Burst Mode® enabling <100µA quiescent current.
For engineers reviewing the LT3724IFE#TRPBF datasheet, LT3724IFE#TRPBF pinout, LT3724IFE#TRPBF application, or LT3724IFE#TRPBF equivalent, key selection considerations include its 16-pin TSSOP package with exposed thermal pad, programmable soft-start controlling output slew rate, internal high-voltage bias regulator for gate drive, and current-limit immunity to duty cycle via antislope compensation.
Technical Context
The LT3724IFE#TRPBF implements constant-frequency current-mode control with slope and antislope compensation to maintain stable peak-current limiting across all duty cycles. Its error amplifier (gm = 340 µmhos, AV = 62 dB) drives the VC pin to set per-cycle peak switch current, while the 1.231V feedback reference enables precise output regulation.
Burst Mode® operation is triggered when VC voltage falls 150mV below the 15% load threshold, disabling switching and reducing VIN supply current to 100µA; recovery occurs when VC rises back to the latched threshold. The internal VCC regulator supports startup from VIN ≥7.5V and can be back-driven from VOUT to improve efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide industrial and automotive battery inputs without pre-regulation |
| Output Voltage (Buck) | Up to 36V - enables high-side buck conversion for 24V/36V rail generation |
| Switching Frequency | 200kHz fixed - balances EMI, size, and efficiency for medium-power designs |
| Reference Accuracy | ±1.3% - ensures tight output voltage tolerance over temperature and line/load |
| Quiescent Current (Burst) | <100µA - extends battery life in always-on systems with light-load operation |
| Shutdown Current | 10µA - enables ultra-low-power system-level power gating |
| Current Sense Threshold | 150mV - sets accurate, temperature-stable overcurrent protection independent of duty cycle |
Pinout & Package
LT3724IFE#TRPBF is housed in a 16-lead thermally enhanced plastic TSSOP package (FE) with exposed SGND pad (Pin 17) requiring PCB soldering for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Main input supply | Accepts 4–60V; powers internal circuits and VCC regulator during startup |
| NC (2) | No connection | Unbonded; must remain unconnected |
| SHDN (3) | Enable/disable control | 1.35V rising threshold with 120mV hysteresis; pulls below 0.7V for full shutdown |
| CSS (4) | Soft-start timing | Sinks 2µA to control output voltage slew rate; shorting to SGND disables soft-start |
| BURST_EN (5) | Burst Mode enable | Ground to enable low-IQ operation; connect to VCC to disable |
| VFB (6) | Feedback input | Compares output voltage (via resistor divider) to 1.231V reference for regulation |
| VC (7) | Error amplifier output | Sets peak inductor current per cycle; clamped at −100mV during Burst Mode |
| SGND (8,17) | Signal ground | Low-noise reference for feedback and sense circuitry; exposed pad must be soldered |
| SENSE− (9) | Current sense negative | Connects to VOUT side of sense resistor; forms 150mV differential threshold |
| SENSE+ (10) | Current sense positive | Connects to inductor side of sense resistor; enables accurate high-side current sensing |
| PGND (11) | Power ground | High-current return path for VCC regulator and internal SW pull-down switch |
| VCC (12) | Bias supply node | Decoupled with 1µF ceramic; can be back-driven from VOUT to reduce dissipation |
| NC (13) | No connection | Unbonded; must remain unconnected |
| SW (14) | Switch node | Drives external Schottky diode cathode and MOSFET source; swings from VIN to −0.3V |
| TG (15) | Bootstrap gate driver | Drives N-channel MOSFET gate with 9.8V typical "ON" voltage; requires low-inductance trace |
| BOOST (16) | Bootstrap supply | Charged from SW node; referenced to SW; max voltage = VIN + VCC |
Key Features
| Feature | Design Value |
|---|---|
| Antislope compensation | Maintains full current limit capability across 0–95% duty cycle by counteracting slope compensation ramp |
| Programmable soft-start | Directly controls output voltage slew rate via CSS capacitor to limit inrush and enable sequencing |
| Internal high-voltage VCC regulator | Enables direct VIN startup up to 60V without external bias supply; supports back-driving from VOUT |
| Burst Mode® operation | Reduces total supply current to 100µA at light loads while maintaining regulation and low output ripple |
| Thermal shutdown protection | Disables switching above TJ = 125°C to prevent damage during overload or poor heatsinking |
Applications
| Industrial Power Distribution | 12V and 42V Automotive Systems |
|---|---|
Use Scenario: Distributed 24V bus powering PLC I/O modules, sensors, and actuators in factory automation cabinets. IC Role / Device Role / Timing Role: Step-down controller generating regulated 5V/3.3V rails from 24V/48V backplane with high efficiency and low standby loss. Use Value: 200kHz fixed frequency simplifies EMI filtering; Burst Mode® cuts no-load power to <100µA, reducing thermal load in sealed enclosures. | Use Scenario: Engine control unit (ECU) auxiliary power supply operating from 12V battery with cold-crank down to 4V. IC Role / Device Role / Timing Role: High-input-range buck controller delivering stable 5V for microcontroller and CAN transceivers despite wide battery voltage swing. Use Value: 7.5V minimum startup voltage and 4V operating range ensure reliable boot during cranking; UVLO hysteresis prevents oscillation near threshold. |
| High-Voltage Single Board Computers | Telecom Power Conversion |
Use Scenario: Compact embedded computer board requiring isolated 12V and 5V rails from 48V PoE++ or telecom rectifier input. IC Role / Device Role / Timing Role: Primary non-isolated buck controller stepping 48V to 12V, feeding downstream point-of-load regulators. Use Value: 60V absolute max input rating allows direct connection to 48V systems with margin; 16-pin TSSOP with exposed pad enables compact, thermally robust layout. | Use Scenario: Intermediate bus converter in 48V telecom shelf supplying 12V intermediate distribution bus. IC Role / Device Role / Timing Role: High-efficiency, high-reliability step-down controller supporting continuous operation under 48V nominal with transient surges. Use Value: Internal VCC regulator eliminates need for auxiliary bias supply; thermal shutdown and short-circuit protection meet GR-1089 safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage current-mode controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EMSE#PBF | Includes integrated MOSFET drivers with higher peak current (4A), but requires external bootstrap diode; no Burst Mode® | Preferred for higher-current synchronous buck designs where efficiency >95% at full load is critical | Select LTC3891EMSE#PBF when synchronous rectification and >10A output are required; LT3724IFE#TRPBF remains optimal for cost-sensitive nonsynchronous designs ≤75W |
| LM5116MH/NOPB | Fixed 150kHz frequency, lower reference accuracy (±2%), no antislope compensation, wider temp range (−40°C to 125°C same) | Used in industrial motor drives where moderate accuracy and robustness outweigh advanced features | Choose LM5116MH/NOPB for simpler, lower-cost designs where duty-cycle-dependent current limit reduction is acceptable |
Compared with LTC3891EMSE#PBF and LM5116MH/NOPB, the LT3724IFE#TRPBF uniquely combines Burst Mode® for ultra-low IQ, antislope compensation for full-duty-cycle current limit integrity, and a self-contained high-voltage bias regulator-making it ideal for space-constrained, battery-backed, or wide-input industrial supplies where feature integration and light-load efficiency are prioritized over raw output current.
Availability
LT3724IFE#TRPBF is available at Aetrix Electronics and suitable for industrial power distribution, 12V/42V automotive systems, and high-voltage single-board computers requiring stable component supply, long-term lifecycle support, and guaranteed −40°C to 125°C operation.
Supply support for LT3724IFE#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 power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3724IFE#TRPBF belongs to ADI's legacy Linear Technology high-voltage DC/DC controller product line, designed specifically for robust, efficient, and flexible medium-power switching power supplies in demanding industrial and automotive environments.
FAQ
What is the minimum input voltage required for LT3724IFE#TRPBF to start up?
The LT3724IFE#TRPBF requires a minimum startup voltage of 7.5V on the VIN pin to initiate operation when powered solely from VIN. However, once running, it can sustain operation down to 4V if VCC is back-driven from the output rail via an external diode-enabling reliable function during automotive cold-crank events.
Does LT3724IFE#TRPBF support synchronous rectification?
No, the LT3724IFE#TRPBF is designed for nonsynchronous operation and drives only a single external N-channel MOSFET (via TG pin) with a freewheeling Schottky diode. For synchronous buck topologies, consider the pin-compatible LT3800, which replaces the diode with a second MOSFET driven by an integrated bottom-side driver.
How does the antislope compensation in LT3724IFE#TRPBF improve design reliability?
The antislope compensation in LT3724IFE#TRPBF actively offsets the current-sense ramp added for stability, ensuring the 150mV current limit threshold remains fully effective across all duty cycles-including high-duty-cycle 48V-to-12V conversions. This prevents unintended current derating and maintains consistent short-circuit protection without requiring oversized sense resistors.
Can LT3724IFE#TRPBF be used in boost or SEPIC configurations?
Yes, the LT3724IFE#TRPBF supports boost, inverting, and SEPIC topologies in addition to buck, as confirmed by its functional diagram, typical applications, and absolute maximum ratings (e.g., SW pin rated to −1V transient, BOOST to 80V). External component selection-including inductor, capacitor, and diode ratings-must comply with topology-specific stress requirements.
What is the purpose of the exposed pad (Pin 17) on the LT3724IFE#TRPBF package?
The exposed pad on the LT3724IFE#TRPBF is internally connected to SGND (signal ground) and must be soldered to a PCB copper pour for both electrical integrity and thermal performance. It reduces thermal resistance (θJC = 10°C/W) and provides a low-impedance return path for sensitive analog circuitry, directly impacting loop stability and noise immunity in high-frequency switching applications.
LT3724IFE#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
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 200kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3724IFE#TRPBF FAQ
1.How can I place an order for LT3724IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3724IFE#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 LT3724IFE#TRPBF reliable?
The price and inventory of LT3724IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3724IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3724IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3724IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3724IFE#TRPBF?
LT3724IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3724IFE#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 LT3724IFE#TRPBF?
For technical support, including LT3724IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3724IFE#TRPBF requirements.
6.How does Aetrix verify that LT3724IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3724IFE#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 LT3724IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3724IFE#TRPBF?
All LT3724IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3724IFE#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 LT3724IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3724IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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