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Analog Devices Inc. LT3758IDD#TRPBF
- Part No.:
- LT3758IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3758IDD#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,083
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Product details
Overview
LT3758IDD#TRPBF from Analog Devices is a wide-input (5.5V–100V), current-mode DC/DC controller supporting boost, flyback, SEPIC, and inverting topologies with single-feedback-pin polarity selection. It drives an external N-channel MOSFET, features 100kHz–1MHz programmable switching frequency, <1µA shutdown current, and AEC-Q100 qualification for automotive use.
For engineers reviewing the LT3758IDD#TRPBF datasheet, LT3758IDD#TRPBF pinout, LT3758IDD#TRPBF application, or LT3758IDD#TRPBF equivalent, this page delivers verified topology flexibility, precise undervoltage lockout programming, internal 7.2V LDO regulation, soft-start control, and thermal-derated gate drive capability - all critical for high-voltage industrial and automotive power supply design.
Technical Context
The LT3758IDD#TRPBF implements fixed-frequency current-mode control with slope compensation, enabling stable operation across wide input (5.5V–100V) and output voltage ranges. Its dual-regulation architecture supports both positive (FBX = +1.6V) and negative (FBX = –0.8V) feedback references, allowing seamless reconfiguration between boost/flyback/SEPIC and inverting topologies without hardware change.
It integrates a 7.2V low-dropout regulator (LDO) powering the gate driver and internal circuitry, with UVLO (4.5V) and OVLO (17.5V) protection. The SHDN/UVLO pin enables accurate, hysteresis-programmable input undervoltage detection using an internal 2µA current source and 1.22V reference - critical for battery-backed or wide-range industrial supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to 48V telecom, 72V industrial, or 96V battery systems without pre-regulation. |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor; enables optimization of magnetics size vs. efficiency and EMI performance. |
| SENSE Threshold | 110mV (typical) - defines peak switch current limit; allows precise overcurrent protection with low-value sense resistors. |
| FBX Regulation | +1.6V or –0.8V - selectable via external divider; eliminates need for separate positive/negative feedback networks. |
| Shutdown IQ | <1µA - enables long-term battery hold-up in automotive telematics or remote sensors during sleep mode. |
| INTVCC Regulator | 7.2V ±0.2V - powers gate driver and logic; bypassed with ≥4.7µF ceramic capacitor for transient gate charge delivery. |
| Package | 10-lead 3mm × 3mm DFN (DD) with exposed pad - provides θJA = 43°C/W thermal resistance when soldered to PCB ground plane. |
Pinout & Package
LT3758IDD#TRPBF uses a 10-lead plastic DFN package (3mm × 3mm) with exposed thermal pad (Pin 11 = GND). The exposed pad must be soldered directly to the PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; clamped during soft-start and fault conditions. |
| FBX (Pin 2) | Unified positive/negative feedback input | Sets output regulation at +1.6V (boost/flyback/SEPIC) or –0.8V (inverting); modulates frequency during overcurrent. |
| SS (Pin 3) | Soft-start timing control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO, INTVCC fault, or thermal lockout. |
| RT (Pin 4) | Frequency programming input | Resistor-to-GND sets switching frequency (100kHz–1MHz); open-circuit disables operation. |
| SYNC (Pin 5) | External clock synchronization input | Accepts digital clock signal; requires RT setting 20% below SYNC frequency; tied to GND if unused. |
| SENSE (Pin 6) | Current sense amplifier input | Kelvin-connected to MOSFET source-side sense resistor; monitors peak switch current for cycle-by-cycle limiting. |
| GATE (Pin 7) | N-channel MOSFET gate driver output | Swings between INTVCC and GND; forced low during shutdown, thermal fault, or INTVCC UV/OV conditions. |
| INTVCC (Pin 8) | Internal 7.2V LDO output | Powers gate driver and internal logic; must be bypassed with ≥4.7µF ceramic cap; can be externally powered above 7.5V. |
| SHDN/UVLO (Pin 9) | Enable/disable and input UVLO input | 1.22V falling threshold with programmable hysteresis; pulls down 2µA to set rising threshold; <0.4V forces shutdown. |
| VIN (Pin 10) | Main input supply input | Accepts 5.5V–100V; requires local 0.22µF+ ceramic bypass; powers internal LDO and bias circuits. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Must be soldered to PCB ground plane; serves as GND return and negative terminal for SENSE resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, flyback, SEPIC, and inverting configurations via FBX reference polarity selection - reduces BOM count and design reuse effort. |
| Programmable UVLO with Hysteresis | SHDN/UVLO pin enables accurate, resistor-programmable turn-on/off thresholds using internal 2µA current source - eliminates external supervisor ICs. |
| Frequency Foldback | Automatically reduces switching frequency during overload or short-circuit to limit inductor current and prevent thermal runaway - enhances system robustness. |
| Integrated 7.2V LDO | Regulates gate drive supply from VIN; includes UVLO (4.5V) and OVLO (17.5V) protection - ensures reliable MOSFET turn-on while preventing gate oxide stress. |
| AEC-Q100 Qualified | Rated for –40°C to +125°C junction temperature with automotive-grade reliability testing - suitable for under-hood and ADAS power supplies. |
Applications
| Automotive Infotainment Power Supply | Industrial 48V Telecom Rectifier |
|---|---|
|
Use Scenario: Generating isolated 12V/3A output from 24V–72V vehicle battery bus for head unit and display modules. IC Role / Device Role / Timing Role: Flyback controller with primary-side sensing; regulates output via optocoupler feedback to FBX pin. Use Value: Enables single-chip solution across wide battery range (cold crank to load dump), reducing component count versus discrete controllers. |
Use Scenario: Non-isolated 54V-to-12V SEPIC converter in telecom base station power shelf with 48V nominal input. IC Role / Device Role / Timing Role: SEPIC controller driving 100V-rated N-MOSFET; uses FBX = +1.6V reference and RT = 41.2kΩ for 300kHz operation. Use Value: Maintains regulation during brownouts (down to 5.5V) and withstands 100V transients - meets GR-1089-CORE surge immunity requirements. |
| Ruggedized IoT Sensor Node | High-Voltage Industrial PLC Input Module |
|
Use Scenario: Battery-powered environmental sensor with 3.7V Li-ion input and 5V/200mA regulated output for MCU and radio. IC Role / Device Role / Timing Role: Boost controller with SS capacitor for controlled start-up; shutdown IQ <1µA extends battery life. Use Value: Achieves >85% efficiency at light loads and supports 10-year field deployment without maintenance due to ultra-low quiescent current. |
Use Scenario: 24V-to-±15V dual-rail inverting supply for analog front-end of industrial I/O module accepting 12–60V DC input. IC Role / Device Role / Timing Role: Inverting controller with FBX = –0.8V reference; uses SENSE pin for current limiting on high-side switch path. Use Value: Eliminates need for separate negative-bias generator IC; supports EN 61000-4-5 surge testing up to 4kV due to 100V VIN rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3895EFE#PBF | Fixed 150kHz frequency; no FBX polarity selection; supports only boost/flyback (no SEPIC/inverting) | Lacks topology flexibility and programmable frequency - suitable only for fixed-frequency boost/flyback where simplicity outweighs configurability | Select LTC3895EFE#PBF only when fixed frequency and reduced feature set are acceptable to simplify layout and reduce bill-of-materials. |
| LM5165QPWPRQ1 | Lower VIN max (65V); integrated 50V MOSFET; no SENSE pin; supports only buck/buck-boost | Not suitable for >65V inputs or isolated topologies; limited to non-isolated step-down conversion | Choose LM5165QPWPRQ1 only for cost-sensitive, lower-voltage (<65V) buck applications where integration outweighs voltage and topology constraints. |
Compared with LTC3895EFE#PBF and LM5165QPWPRQ1, the LT3758IDD#TRPBF uniquely combines 100V input rating, topology agnosticism (boost/flyback/SEPIC/inverting), and programmable frequency - making it the only option capable of replacing multiple controller families in high-reliability, multi-rail industrial and automotive designs.
Availability
LT3758IDD#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial telecom rectifiers, ruggedized IoT sensor nodes, and high-voltage PLC input modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3758IDD#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets with precision, reliability, and innovation.
The LT3758 series was designed specifically for high-input-voltage DC/DC control in harsh environments - delivering robust operation from 5.5V to 100V while supporting multiple topologies and automotive-grade reliability.
FAQ
What is the maximum input voltage supported by the LT3758IDD#TRPBF?
The LT3758IDD#TRPBF supports an absolute maximum input voltage of 100V on the VIN pin, with guaranteed operation across 5.5V to 100V. This enables direct interface with 48V, 72V, and 96V industrial and automotive battery systems without pre-regulation stages - a key differentiator versus most controllers rated ≤60V.
How does the LT3758IDD#TRPBF support both positive and negative output voltages?
The LT3758IDD#TRPBF uses a unified FBX pin that regulates to either +1.6V (for boost/flyback/SEPIC) or –0.8V (for inverting configurations), selected solely by the external feedback resistor divider polarity. No pin reconfiguration or external logic is required - the IC automatically adapts its error amplifier behavior based on FBX voltage level.
Can the LT3758IDD#TRPBF be synchronized to an external clock?
Yes, the LT3758IDD#TRPBF supports external clock synchronization via the SYNC pin. When used, the RT resistor must be selected to program a frequency 20% slower than the SYNC signal; the SYNC input accepts digital logic-level pulses with minimum 200ns width. If unused, SYNC must be tied to GND.
What thermal considerations apply to the LT3758IDD#TRPBF in high-power applications?
The LT3758IDD#TRPBF uses a 3mm × 3mm DFN package with exposed pad (θJA = 43°C/W). To maintain safe junction temperature, the exposed pad must be soldered to a full PCB ground plane. Gate drive power dissipation (VIN × f × QG) must be calculated and derated above 125°C - especially critical when driving large MOSFETs at high frequency and high VIN.
Is the LT3758IDD#TRPBF qualified for automotive applications?
Yes, the LT3758IDD#TRPBF is AEC-Q100 qualified for automotive applications, rated for –40°C to +125°C operating junction temperature, and manufactured under automotive quality controls. It is explicitly designated for use in automotive infotainment, ADAS, and body electronics where reliability under temperature, vibration, and voltage transients is mandatory.
LT3758IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Boost, Flyback, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 5.5V ~ 100V
- Frequency - Switching:
- 100kHz ~ 1MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT3758IDD#TRPBF FAQ
1.How can I place an order for LT3758IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758IDD#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 LT3758IDD#TRPBF reliable?
The price and inventory of LT3758IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3758IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758IDD#TRPBF?
LT3758IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758IDD#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 LT3758IDD#TRPBF?
For technical support, including LT3758IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758IDD#TRPBF requirements.
6.How does Aetrix verify that LT3758IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3758IDD#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 LT3758IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3758IDD#TRPBF?
All LT3758IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758IDD#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 LT3758IDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3758IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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