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Analog Devices Inc. LT3724EFE#PBF
- Part No.:
- LT3724EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3724EFE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:454
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Product details
Overview
LT3724EFE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode DC/DC controller for medium-power step-down, step-up, inverting, and SEPIC converters. It operates from 4V–60V input, delivers up to 36V output, features 200kHz fixed-frequency PWM control, ±1.3% reference accuracy, and drives external N-channel MOSFETs - used in automotive 12V/42V power systems and telecom front-end supplies.
For engineers reviewing the LT3724EFE#PBF datasheet, LT3724EFE#PBF pinout, LT3724EFE#PBF application, or LT3724EFE#PBF equivalent, key selection considerations include its 150mV current-sense threshold, 10µA shutdown current, Burst Mode operation (<100µA quiescent), programmable soft-start, and thermal shutdown protection in a thermally enhanced 16-pin TSSOP package.
Technical Context
The LT3724EFE#PBF implements constant-frequency current-mode control with slope compensation and antislope compensation to maintain full current limit across all duty cycles. Its error amplifier (gm = 340 µmhos, AV = 62 dB) regulates via VFB feedback referenced to 1.231V, while VC sets peak switch current per cycle.
It integrates a high-voltage bias regulator (VIN → VCC), bootstrapped gate driver (TG/BOOST), and dual UVLO thresholds on VIN, VCC, and BOOST - each with hysteresis. The SW pin supports nonsynchronous topologies with internal pull-down during off-time to recharge CBOOST, and SENSE+/SENSE− inputs provide differential current sensing with 150mV threshold unaffected by duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide industrial and automotive battery inputs without pre-regulation. |
| Switching Frequency | 200kHz fixed - enables predictable EMI filtering and compact magnetics design. |
| Reference Accuracy | ±1.3% over temperature - ensures stable output voltage regulation under load and thermal variation. |
| Current Sense Threshold | 150mV - sets precise, temperature-stable overcurrent protection independent of duty cycle. |
| Quiescent Current (Burst Mode) | <100µA - extends battery life in standby or light-load applications like avionics monitoring rails. |
| Shutdown Current | 10µA - enables ultra-low-power system-level power gating. |
| Gate Drive Capability | 9.8V high-side drive with 60ns rise/fall - directly drives large N-channel MOSFETs with minimal external components. |
Pinout & Package
LT3724EFE#PBF is housed in a 16-lead plastic TSSOP package with exposed pad (Pin 17), which must be soldered to PCB SGND for thermal and electrical integrity. Pin 2 and Pin 13 are no-connect (NC); Pin 17 is internally tied to SGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Main supply input | Accepts 4V–60V; powers internal circuits and charges VCC regulator - requires local low-ESR decoupling. |
| SHDN (3) | Enable/UVLO control | 1.35V rising threshold with 120mV hysteresis - enables precision undervoltage lockout or remote ON/OFF control. |
| CSS (4) | Soft-start timing | Sinks 2µA to control output voltage slew rate - prevents inrush current and facilitates supply sequencing. |
| BURST_EN (5) | Burst Mode enable | Ground = enable low-IQ mode; VCC = disable - allows dynamic efficiency optimization. |
| VFB (6) | Feedback input | Compares output voltage (via resistor divider) to 1.231V reference - primary regulation node. |
| VC (7) | Error amp output | DC voltage setting peak inductor current - integrator pole placement determines loop stability. |
| SGND (8,17) | Signal ground | Low-noise reference for VFB, VC, CSS - must be isolated from high-current PGND paths. |
| SENSE+ / SENSE− (9,10) | Differential current sense | Measures voltage across external RSENSE; 150mV threshold triggers cycle-by-cycle current limiting. |
| PGND (11) | Power ground | Return path for VCC regulator and internal low-side switch - connects to VCC capacitor negative terminal. |
| VCC (12) | Bias supply node | Internally regulated ~8V rail; can be back-driven from VOUT to reduce dissipation and improve efficiency. |
| SW (14) | Switch node | Connects to MOSFET source, Schottky cathode, and inductor - swings from VIN to ~−0.3V during freewheeling. |
| TG (15) | Bootstrapped gate driver | Drives N-MOSFET gate with high peak current - requires short, low-inductance trace to MOSFET gate. |
| BOOST (16) | Bootstrap supply | Charged from SW node via external diode and CBOOST - referenced to SW, not ground; max voltage = VIN + VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Antislope Compensation | Maintains full 150mV current limit across 0–95% duty cycle - eliminates power derating in high-VIN/low-VOUT buck designs. |
| Programmable Soft-Start | Direct dV/dt control via CSS capacitor - limits inrush, suppresses overshoot, and enables controlled power-up sequencing. |
| Internal High-Voltage Bias Regulator | Generates VCC from VIN up to 60V - eliminates need for external bias supply in most applications. |
| Burst Mode Operation | Reduces total IQ to <100µA at light loads - preserves efficiency down to µA-level output currents. |
| Thermal Shutdown Protection | Activates at TJ = 125°C - protects IC during overload or poor heatsinking without external circuitry. |
Applications
| Automotive Power Distribution | Telecom Front-End Supply |
|---|---|
Use Scenario: 42V heavy-duty vehicle subsystem powering infotainment, ADAS sensors, and lighting modules from alternator/battery. IC Role / Device Role / Timing Role: Step-down controller regulating 12V or 5V rails from variable 24–60V input with transient immunity. Use Value: Wide 4V–60V input range accommodates cold-crank (4V) and load-dump (60V) events without external protection. | Use Scenario: Intermediate bus converter in 48V telecom equipment delivering isolated 12V/5V outputs to line cards and processors. IC Role / Device Role / Timing Role: Primary-side nonsynchronous buck controller managing high-efficiency, low-noise intermediate distribution. Use Value: 200kHz fixed frequency simplifies EMI filter design; Burst Mode maintains >85% efficiency at 10mA load. |
| Avionics Monitoring Rail | Industrial High-Voltage Single Board System |
Use Scenario: Low-power auxiliary supply for flight data recorders and cockpit displays requiring ultra-low standby current. IC Role / Device Role / Timing Role: Always-on controller providing regulated 3.3V/5V from aircraft 28V main bus with micropower shutdown. Use Value: 10µA shutdown current and <100µA Burst Mode operation extend backup battery life beyond 1000 hours. | Use Scenario: Compact power stage on high-density PLC or motor drive board converting 48V bus to 15V logic and 5V MCU rails. IC Role / Device Role / Timing Role: Dual-output step-down controller (using SEPIC or inverting topology) minimizing component count and board area. Use Value: Integrated gate driver and high-voltage capability eliminate external level shifters and HV FET drivers - reducing BOM by ≥4 parts. |
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 for synchronous rectification; higher VIN max (60V); adds PMBus interface. | Requires synchronous design; suited for higher-efficiency, digitally monitored supplies. | Select when synchronous operation, digital telemetry, or tighter output regulation (±0.5%) are required. |
| LM5116MH/NOPB | Fixed 150kHz frequency; no Burst Mode; lower VIN range (6–100V); external VCC required above 15V. | Designed for high-input industrial supplies; lacks integrated bias regulator and soft-start programmability. | Select for cost-sensitive, non-battery applications where 150kHz switching and simpler layout are prioritized. |
Compared with LTC3891EMSE#PBF, LT3724EFE#PBF offers lower quiescent current and simpler nonsynchronous implementation; compared with LM5116MH/NOPB, it provides superior light-load efficiency and integrated startup bias - making it optimal for automotive and avionics where reliability and micropower matter.
Availability
LT3724EFE#PBF is available at Aetrix Electronics and suitable for automotive power distribution, telecom front-end supplies, and avionics monitoring rails requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LT3724EFE#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio with rigorous qualification and long-term support.
The LT3724EFE#PBF belongs to Linear's high-voltage DC/DC controller family, designed specifically for robust, low-component-count power conversion in harsh environments - including automotive, industrial, and aerospace applications demanding wide input range and high reliability.
FAQ
What is the minimum input voltage required for LT3724EFE#PBF to start up?
The LT3724EFE#PBF requires a minimum startup voltage of 7.5V on the VIN pin when powered solely from VIN. However, if VCC is externally driven above 6.5V (e.g., from the output rail), the LT3724EFE#PBF can operate down to 4V input - enabling cold-crank compatibility in automotive systems where battery voltage dips below 6V.
Can LT3724EFE#PBF drive synchronous rectifiers?
No, the LT3724EFE#PBF is designed for nonsynchronous topologies only. It provides a single high-side gate driver (TG) and relies on an external Schottky diode for freewheeling. For synchronous operation, consider the pin-compatible LTC3800 or LTC3891 - both of which integrate complementary low-side drivers and support MOSFET-based rectification.
How does the antislope compensation in LT3724EFE#PBF improve performance?
The antislope compensation in LT3724EFE#PBF cancels the duty-cycle-dependent reduction in current limit caused by standard slope compensation. By adding a matching ramp to the current threshold, it ensures the 150mV sense limit remains fully effective across all operating conditions - allowing the LT3724EFE#PBF to deliver full rated power even at 90%+ duty cycle in high-input/low-output buck configurations.
What is the function of the BOOST pin on LT3724EFE#PBF?
The BOOST pin on LT3724EFE#PBF supplies the bootstrapped gate driver (TG). It is externally connected to a ceramic capacitor referenced to the SW pin. During MOSFET off-time, an internal switch pulls SW to PGND, charging CBOOST. This enables the TG pin to generate ~9.8V gate drive relative to the MOSFET source - essential for fully enhancing high-voltage N-channel MOSFETs in step-down topologies.
Is LT3724EFE#PBF RoHS-compliant and lead-free?
Yes, the LT3724EFE#PBF carries the #PBF suffix, indicating it is lead-free and RoHS-compliant per EU Directive 2011/65/EU. The device uses matte tin finish on its leads and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements - suitable for standard reflow assembly processes without special handling.
LT3724EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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
LT3724EFE#PBF FAQ
1.How can I place an order for LT3724EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3724EFE#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 LT3724EFE#PBF reliable?
The price and inventory of LT3724EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3724EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3724EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3724EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3724EFE#PBF?
LT3724EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3724EFE#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 LT3724EFE#PBF?
For technical support, including LT3724EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3724EFE#PBF requirements.
6.How does Aetrix verify that LT3724EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3724EFE#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 LT3724EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3724EFE#PBF?
All LT3724EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3724EFE#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 LT3724EFE#PBF part is unused and in its original packaging.
Return procedure for LT3724EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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