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Analog Devices Inc. LT3724MPFE#PBF
- Part No.:
- LT3724MPFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3724MPFE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,829
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Product details
Overview
LT3724MPFE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode DC/DC controller IC 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 42V automotive systems.
For engineers reviewing the LT3724MPFE#PBF datasheet, LT3724MPFE#PBF pinout, LT3724MPFE#PBF application, or LT3724MPFE#PBF equivalent, key selection criteria include its –55°C to 125°C extended temperature grade, 150mV current sense threshold, ±1.3% reference accuracy, programmable soft-start via CSS pin, and internal high-voltage bias regulator enabling efficient gate drive without external bootstrap circuitry.
Technical Context
The LT3724MPFE#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 = 340µmhos, AV = 62dB) regulates output voltage by adjusting peak inductor current via the VC pin, referenced to a 1.231V internal bandgap.
It integrates a high-voltage linear regulator powering VCC from VIN (up to 60V), a bootstrapped gate driver (TG pin, 9.8V typical ON voltage), and independent UVLO thresholds on VIN (3.8V falling), VCC (6.25V rising), and BOOST (75V max). Shutdown is controlled by SHDN pin with 1.35V rising threshold and 120mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range industrial and automotive inputs including 12V/24V/42V systems. |
| Operating Frequency | 200kHz fixed - enables predictable EMI filtering and compact magnetics design. |
| Reference Voltage Accuracy | ±1.3% - ensures tight output regulation over temperature and line/load conditions. |
| Current Sense Threshold | 150mV - sets precise overcurrent protection independent of duty cycle due to antislope compensation. |
| Burst Mode Quiescent Current | <100µA - maintains high light-load efficiency in battery-backed or always-on systems. |
| Shutdown Supply Current | 10µA - enables ultra-low-power system-level sleep modes. |
| Junction Temperature Range | –55°C to 125°C - qualified for extended-temperature industrial and avionics applications. |
| Package | 16-pin TSSOP with exposed pad - provides thermal performance suitable for 75W step-down designs. |
Pinout & Package
LT3724MPFE#PBF is housed in a 16-lead plastic TSSOP package with exposed thermal pad (Pin 17), which must be soldered to SGND for electrical integrity and thermal management. The package is thermally enhanced for high-power density operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Main input supply rail | Accepts 4V–60V; powers internal regulator and supplies startup energy; requires local low-ESR decoupling to SGND. |
| SHDN (3) | Enable/disable control | 1.35V rising threshold with 120mV hysteresis; pulls below 0.7V for deep shutdown (10µA IQ). |
| CSS (4) | Soft-start timing control | Sinks 2µA to set output voltage slew rate; shorting to SGND disables soft-start. |
| BURST_EN (5) | Burst Mode enable | Ground to enable low-IQ mode; connect to VCC to disable and force continuous switching. |
| VFB (6) | Feedback reference node | Compares output voltage (via resistor divider) to 1.231V internal reference; regulates output precision. |
| VC (7) | Error amplifier output | Controls peak switch current per cycle; integrator pole placement sets loop stability and transient response. |
| SGND (8,17) | Signal ground reference | Low-noise analog ground; connects to –VOUT side of output capacitors; exposed pad must be soldered. |
| SENSE+ / SENSE– (9,10) | Current sense differential inputs | Monitor voltage across external sense resistor; 150mV threshold triggers cycle-by-cycle current limiting. |
| PGND (11) | Power ground return | High-current return path for VCC regulator and internal SW pull-down switch; connects to VCC capacitor negative. |
| VCC (12) | Internal bias supply | Powered by VIN regulator or back-driven from VOUT; decoupled with 1µF ceramic to PGND. |
| SW (14) | Switch node connection | Connects to MOSFET source and Schottky cathode; swings from VIN to ~–0.3V; internal pull-down recharges BOOST cap. |
| TG (15) | Bootstrapped gate driver | Drives N-MOSFET gate with fast rise/fall (60ns); requires short, wide PCB trace to minimize inductance. |
| BOOST (16) | Bootstrap capacitor supply | Referenced to SW; charges during MOSFET off-time; max voltage = VIN + VCC (ground-referred). |
Key Features
| Feature | Design Value |
|---|---|
| Antislope compensation | Maintains full 150mV current limit across 0–95% duty cycle-no derating required for high-VIN/low-VOUT designs. |
| Programmable soft-start | Direct dV/dt control of output voltage via CSS capacitor-limits inrush, prevents overshoot, and enables precise supply sequencing. |
| Internal high-voltage bias regulator | Generates VCC directly from VIN up to 60V-eliminates need for external bias supply in most applications. |
| Thermal shutdown protection | Activates at TJ = 125°C-protects device during overload while allowing momentary peak power operation. |
| Back-drivable VCC | Accepts external VOUT-derived supply via diode-reduces IC power dissipation and improves overall converter efficiency. |
| Multiple topology support | Natively supports buck, boost, inverting, and SEPIC-enables reuse of single controller IC across diverse power architectures. |
Applications
| Industrial Power Distribution | 42V Automotive Systems |
|---|---|
Use Scenario: Centralized 24V/48V DC bus powering multiple subsystems in factory automation cabinets. IC Role / Device Role / Timing Role: Step-down controller regulating isolated 5V/12V rails from 48V input with precise sequencing and fault tolerance. Use Value: Wide 4V–60V input range accommodates brownout and load-dump transients; 10µA shutdown enables remote system wake-up. | Use Scenario: Engine control unit (ECU) power supply operating in under-hood environments with extreme temperature cycling. IC Role / Device Role / Timing Role: Primary buck controller converting 42V nominal battery to 3.3V/5V logic rails with extended –55°C to 125°C operation. Use Value: MP-grade qualification ensures reliability at cold cranking (–40°C start) and sustained high-temp operation (>105°C ambient). |
| Avionics Power Conversion | Distributed Telecom Power |
Use Scenario: 28V aircraft bus powering mission-critical flight display and sensor interfaces. IC Role / Device Role / Timing Role: High-reliability step-down regulator delivering tightly regulated 15V analog supply with low ripple and fast transient response. Use Value: ±1.3% reference accuracy and 200kHz fixed frequency ensure stable timing margins for analog signal chains and ADC references. | Use Scenario: Intermediate bus converter in 48V telecom rack supplying 12V to line cards and fan controllers. IC Role / Device Role / Timing Role: Efficient 75W buck controller with Burst Mode maintaining >85% efficiency at 10% load. Use Value: <100µA Burst Mode IQ reduces standby power in always-on network infrastructure without sacrificing dynamic response. |
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 |
|---|---|---|---|
| LTC3724MPFE#PBF | Same die, identical electrical specs and pinout; rebranded post-Analog Devices acquisition. | No functional difference; same MP-grade temperature range and TSSOP package. | Select when sourcing from distributors listing LTC-branded stock; fully interchangeable with LT3724MPFE#PBF. |
| LT3757MPFE#PBF | Higher 100V input rating, 1MHz max frequency, no Burst Mode; includes valley-current sensing for flyback. | Targeted at isolated flyback/forward topologies-not optimized for non-isolated buck/boost like LT3724MPFE#PBF. | Choose only if input exceeds 60V or isolation is required; not a drop-in replacement due to different control architecture and feature set. |
Compared with LT3724MPFE#PBF, LTC3724MPFE#PBF offers identical performance and qualification, while LT3757MPFE#PBF trades Burst Mode and buck-optimized current sensing for higher input voltage and isolated topology support-making it unsuitable for direct substitution in existing LT3724MPFE#PBF-based buck designs.
Availability
LT3724MPFE#PBF is available at Aetrix Electronics and suitable for industrial power distribution, 42V automotive systems, and avionics power conversion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3724MPFE#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 semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision, industrial, automotive, and aerospace applications.
The LT3724MPFE#PBF belongs to ADI's high-voltage DC/DC controller product line, designed specifically for robust, medium-power non-isolated switching regulators in harsh environments where wide input range, extended temperature operation, and high reliability are critical.
FAQ
What is the operating temperature range of the LT3724MPFE#PBF?
The LT3724MPFE#PBF is rated for a junction temperature range of –55°C to 125°C. This extended grade is 100% tested and guaranteed, making it suitable for demanding applications such as under-hood automotive electronics, avionics, and industrial equipment exposed to extreme thermal environments. Its thermal shutdown activates at 125°C to protect against sustained overload.
How does the LT3724MPFE#PBF achieve current limit independence from duty cycle?
The LT3724MPFE#PBF uses integrated antislope compensation: as slope compensation adds an artificial ramp to the sensed current waveform, a matching ramp is added to the current limit threshold. This preserves the effective 150mV current sense threshold across all duty cycles-unlike conventional controllers where current limit degrades at high duty cycles. This ensures full power capability in high-input, low-output buck designs.
Can the LT3724MPFE#PBF drive synchronous rectifiers?
No, the LT3724MPFE#PBF is designed for nonsynchronous operation and drives only a single external N-channel MOSFET (via TG pin) with a freewheeling Schottky diode. It lacks the complementary low-side gate driver required for synchronous rectification. For synchronous buck applications, consider the LT3800 or LT3782-devices explicitly architected for dual-MOSFET control.
What is the purpose of the exposed pad on the LT3724MPFE#PBF package?
The exposed pad on the LT3724MPFE#PBF is internally connected to SGND (Pin 8) and must be soldered to the PCB ground plane. It serves two critical functions: (1) providing low-inductance, low-resistance signal ground return for sensitive analog circuitry, and (2) enhancing thermal conduction from the die to the board-reducing θJA from 40°C/W to ~10°C/W when properly implemented-essential for reliable 75W operation.
How is Burst Mode operation enabled or disabled on the LT3724MPFE#PBF?
Burst Mode operation on the LT3724MPFE#PBF is controlled by the BURST_EN pin (Pin 5): connect it to SGND to enable Burst Mode (quiescent current <100µA), or connect it to VCC to disable Burst Mode and enforce continuous switching. When enabled, the IC skips switching cycles under light load, reducing power loss while maintaining regulation-ideal for battery-powered or energy-sensitive systems using the LT3724MPFE#PBF.
LT3724MPFE#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:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3724MPFE#PBF FAQ
1.How can I place an order for LT3724MPFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3724MPFE#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 LT3724MPFE#PBF reliable?
The price and inventory of LT3724MPFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3724MPFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3724MPFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3724MPFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3724MPFE#PBF?
LT3724MPFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3724MPFE#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 LT3724MPFE#PBF?
For technical support, including LT3724MPFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3724MPFE#PBF requirements.
6.How does Aetrix verify that LT3724MPFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3724MPFE#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 LT3724MPFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3724MPFE#PBF?
All LT3724MPFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3724MPFE#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 LT3724MPFE#PBF part is unused and in its original packaging.
Return procedure for LT3724MPFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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