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Analog Devices Inc. LT3724IFE#PBF
- Part No.:
- LT3724IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3724IFE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:130
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Product details
Overview
LT3724IFE#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 to 60V input, delivers up to 36V output in buck topology, features 200kHz fixed-frequency PWM control, Burst Mode operation (<100µA quiescent current), and drives external N-channel MOSFETs. It is used in industrial power distribution and 12V/42V automotive systems.
For engineers reviewing the LT3724IFE#PBF datasheet, LT3724IFE#PBF pinout, LT3724IFE#PBF application, or LT3724IFE#PBF equivalent, key selection criteria include its 150mV current sense threshold, ±1.3% reference accuracy, programmable soft-start via CSS pin, thermal shutdown protection, and compatibility with high-side N-MOSFET gate drive using BOOST/TG pins.
Technical Context
The LT3724IFE#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, VFB = 1.231V) regulates output voltage by modulating peak inductor current via the VC pin.
It integrates a high-voltage bias regulator (VIN-to-VCC) enabling startup down to 7.5V, supports external VCC back-driving for improved efficiency, and includes adaptive nonoverlap circuitry between TG driver and internal SW pull-down switch to prevent shoot-through.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range industrial and automotive inputs including 12V, 24V, and 42V battery systems. |
| Switching Frequency | 200kHz fixed - enables predictable EMI filtering and stable loop compensation without external timing components. |
| Current Sense Threshold | 150mV - sets precise overcurrent protection independent of duty cycle due to antislope compensation. |
| Reference Voltage Accuracy | ±1.3% - ensures tight output voltage regulation across temperature and line/load conditions. |
| Burst Mode Quiescent Current | <100µA - maintains high light-load efficiency in always-on systems like telematics or sensor nodes. |
| Shutdown Supply Current | 10µA - enables ultra-low-power system-level sleep modes without auxiliary regulators. |
| Gate Drive Output | 9.8V typical high-side drive - sufficient to fully enhance standard logic-level N-channel MOSFETs in high-side configuration. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial environments. |
Pinout & Package
LT3724IFE#PBF is housed in a 16-lead thermally enhanced TSSOP package with exposed pad (Pin 17) soldered to SGND for optimal thermal performance and low-noise grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Main supply input | Accepts 4V–60V input; powers internal circuits and VCC regulator during startup. |
| SHDN (3) | Enable/disable control | 1.35V rising threshold with 120mV hysteresis; pulls below 0.7V for deep shutdown (<10µA). |
| CSS (4) | Soft-start timing | Sets output voltage slew rate via external capacitor; 2µA current source controls ramp rate. |
| BURST_EN (5) | Burst Mode control | Ground to enable low-IQ Burst Mode; connect to VCC to disable and force continuous PWM. |
| VFB (6) | Feedback input | Compares output voltage (via resistor divider) to 1.231V internal reference for regulation. |
| VC (7) | Error amplifier output | DC control voltage setting peak inductor current; clamped during Burst Mode to limit ripple. |
| SGND (8,17) | Signal ground | Low-noise analog reference; must be separated from PGND and tied to –VOUT side of output caps. |
| SENSE+ / SENSE– (9,10) | Current sense inputs | Differential pair measuring voltage across external sense resistor; 150mV threshold triggers current limit. |
| 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 to PGND; can be back-driven from VOUT to reduce dissipation. |
| SW (14) | Switch node | Connects to cathode of freewheeling diode and source of top MOSFET; swings from VIN to ~–0.3V. |
| TG (15) | Top-gate driver output | Bootstrapped high-side gate drive; requires short/wide trace to MOSFET gate to minimize ringing. |
| BOOST (16) | Bootstrap supply | Charged via external diode from VCC during SW off-time; referenced to SW pin. |
Key Features
| Feature | Design Value |
|---|---|
| Antislope compensation | Maintains full 150mV current limit across 0–95% duty cycle-no derating required for high-VIN buck applications. |
| Programmable undervoltage lockout | Configurable UVLO on SHDN pin with 120mV hysteresis-enables custom input brownout thresholds without external comparators. |
| Internal high-voltage VCC regulator | Starts from 7.5V VIN and sustains operation up to 60V-eliminates need for external bias supply in most designs. |
| Thermal shutdown protection | Activates at TJ = 125°C with automatic recovery-prevents permanent damage during overload or poor heatsinking. |
| Adaptive nonoverlap timing | Guarantees dead-time between TG turn-off and internal SW pull-down activation-prevents shoot-through in high-side N-MOSFET configurations. |
Applications
| Industrial Power Distribution | 12V/42V Automotive Systems |
|---|---|
Use Scenario: Centralized 24V/48V bus powering multiple isolated DC/DC modules in factory automation PLCs. IC Role / Device Role / Timing Role: Primary controller for high-efficiency, nonsynchronous buck converter delivering regulated 5V/3.3V rails. Use Value: 200kHz fixed frequency simplifies EMI filter design; 60V max input accommodates 48V transients per ISO 7637-2; 10µA shutdown enables remote wake-up capability. | Use Scenario: Engine control unit (ECU) requiring robust 5V supply tolerant of cold-crank (4.5V) and load-dump (60V) events. IC Role / Device Role / Timing Role: High-voltage buck controller regulating 5V microcontroller core rail from vehicle battery. Use Value: 4V–60V input range covers full automotive transient profile; ±1.3% reference ensures ADC accuracy; thermal shutdown protects against under-hood overheating. |
| High-Voltage Single Board Systems | Distributed Telecom Power |
Use Scenario: FPGA-based data acquisition board powered directly from 36V PoE++ or industrial 24V/48V supply. IC Role / Device Role / Timing Role: Step-down controller generating 1.2V core and 1.8V I/O rails with precise sequencing. Use Value: Programmable soft-start (CSS pin) controls VOUT slew rate to meet FPGA power-up timing; 16-pin TSSOP fits dense layouts. | Use Scenario: Remote radio unit (RRU) in 5G base station requiring efficient 12V intermediate bus from –48V telecom supply. IC Role / Device Role / Timing Role: Inverting controller converting –48V to +12V for fan and interface supplies. Use Value: Supports inverting topology without transformer; Burst Mode extends standby battery life; 150mV current sense enables accurate OCP in high-current paths. |
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 (1.1A vs 0.3A), wider VCC range (up to 105V), but no Burst Mode. | Preferred for synchronous buck designs requiring higher gate drive strength and extended input range beyond 60V. | Select LTC3891 when synchronous rectification, higher gate drive, or >60V input is required; not drop-in compatible due to different pinout and feature set. |
| LM5116MH/NOPB | Fixed 150kHz frequency, no Burst Mode, lower reference accuracy (±2%), but supports external clock synchronization. | Better suited for noise-sensitive applications where synchronized switching across multiple rails is mandatory. | Choose LM5116 for multi-rail synchronized systems; LT3724IFE#PBF offers superior light-load efficiency and tighter reference for standalone regulation. |
Compared with LTC3891EMSE#PBF and LM5116MH/NOPB, the LT3724IFE#PBF uniquely balances ultra-low quiescent current (<100µA), antislope-compensated current sensing, and 60V input capability in a compact TSSOP package-making it optimal for cost-sensitive, high-reliability industrial and automotive buck converters where efficiency at light loads and robust overcurrent protection are critical.
Availability
LT3724IFE#PBF is available at Aetrix Electronics and suitable for industrial power distribution, 12V/42V automotive systems, and high-voltage single board systems requiring stable component supply and long-term manufacturability.
Supply support for LT3724IFE#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 legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LT3724IFE#PBF belongs to Linear's high-voltage DC/DC controller product line, designed specifically for nonsynchronous switching regulators in harsh environments where wide input range, precision regulation, and thermal resilience are essential.
FAQ
What is the minimum input voltage required for LT3724IFE#PBF to start up?
The LT3724IFE#PBF requires a minimum startup voltage of 7.5V on the VIN pin when powered solely from the input supply. However, if VCC is externally driven above 6.5V (e.g., from the output rail), the LT3724IFE#PBF can operate continuously down to 4V input-enabling cold-crank support in automotive applications.
How does the LT3724IFE#PBF implement current limiting without duty cycle dependency?
The LT3724IFE#PBF uses antislope compensation: while slope compensation adds an artificial ramp to the sensed current waveform to prevent subharmonic oscillation, a matching ramp is simultaneously added to the current limit threshold. This preserves the full 150mV current sense threshold across all duty cycles-ensuring consistent overcurrent protection in high-input-voltage buck designs where duty cycle varies widely.
Can LT3724IFE#PBF drive a synchronous rectifier instead of a Schottky diode?
No. The LT3724IFE#PBF is designed exclusively for nonsynchronous topologies and lacks a dedicated bottom-gate driver output. It relies on an external Schottky diode for freewheeling. For synchronous buck applications, Analog Devices recommends the pin-compatible LTC3800 or LTC3891, which integrate complementary MOSFET drivers.
What is the purpose of the exposed pad (Pin 17) on the LT3724IFE#PBF package?
The exposed pad on the LT3724IFE#PBF is internally connected to SGND and must be soldered to a PCB copper pour tied to signal ground. It serves two critical functions: (1) lowers thermal resistance (θJC = 10°C/W) to improve power dissipation, and (2) provides a low-inductance, low-noise ground return path for sensitive analog circuitry including the error amplifier and current sense comparator.
How is Burst Mode operation enabled or disabled on the LT3724IFE#PBF?
Burst Mode operation on the LT3724IFE#PBF is controlled by the BURST_EN pin (Pin 5): connecting it to SGND enables Burst Mode (reducing quiescent current to <100µA), while connecting it to VCC disables Burst Mode and forces continuous PWM operation. This allows designers to trade off light-load efficiency versus output voltage ripple based on system requirements.
LT3724IFE#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
LT3724IFE#PBF FAQ
1.How can I place an order for LT3724IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3724IFE#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 LT3724IFE#PBF reliable?
The price and inventory of LT3724IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3724IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3724IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3724IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3724IFE#PBF?
LT3724IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3724IFE#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 LT3724IFE#PBF?
For technical support, including LT3724IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3724IFE#PBF requirements.
6.How does Aetrix verify that LT3724IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3724IFE#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 LT3724IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3724IFE#PBF?
All LT3724IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3724IFE#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 LT3724IFE#PBF part is unused and in its original packaging.
Return procedure for LT3724IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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