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Analog Devices Inc. LT3758AIDD#TRPBF
- Part No.:
- LT3758AIDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3758AIDD#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,137
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Product details
Overview
LT3758AIDD#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 external N-channel MOSFETs, features 100kHz–1MHz programmable switching frequency, <1µA shutdown current, and AEC-Q100 qualification for automotive power systems.
For engineers reviewing the LT3758AIDD#TRPBF datasheet, LT3758AIDD#TRPBF pinout, LT3758AIDD#TRPBF application, or LT3758AIDD#TRPBF equivalent, this page delivers verified topology flexibility, precise UVLO hysteresis programming, INTVCC LDO regulation at 7.2V, FBX dual-reference operation (±0.8V/1.6V), and thermal-aware gate drive capability - all critical for high-reliability industrial and automotive DC/DC design.
Technical Context
The LT3758AIDD#TRPBF implements fixed-frequency current-mode control with slope compensation, enabling stable regulation across wide input/output voltage ranges and fast transient response. Its error amplifier supports dual feedback references (1.6V for positive outputs, –0.8V for negative outputs), and frequency foldback limits inductor current during faults.
It integrates a 7.2V low-dropout regulator (INTVCC) with 4.5V UVLO and 17.5V OVLO thresholds, programmable SHDN/UVLO with 1.22V falling threshold and external hysteresis, and soft-start via external capacitor on SS pin. The SYNC pin enables external clock synchronization with 20% slower RT-set base frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to 48V telecom, 72V industrial, and 12V–48V automotive battery rails without pre-regulation. |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor; enables optimization of magnetics size vs. efficiency and EMI performance. |
| FBX Reference Voltage | +1.6V or –0.8V - single-pin polarity selection allows identical controller IC to regulate either positive or negative output voltages. |
| SENSE Threshold | 110mV (typ) - sets peak switch current limit; enables accurate overcurrent protection with low-loss sense resistors. |
| Shutdown IQ | <1µA - ensures minimal battery drain in always-on automotive modules or backup power systems. |
| INTVCC Regulation | 7.2V ±0.2V - powers internal logic and gate driver; bypassed with ≥4.7µF ceramic capacitor for high di/dt gate drive support. |
| AEC-Q100 Grade | Grade I (–40°C to +125°C) - qualified for under-hood automotive applications including ADAS power supplies and infotainment DC/DC stages. |
Pinout & Package
LT3758AIDD#TRPBF uses a 10-lead 3mm × 3mm plastic DFN package with exposed pad (Pin 11 = GND). Thermal resistance θJA = 43°C/W with proper PCB copper pour under the exposed pad.
| 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) | Positive/negative feedback input | Accepts resistor-divider voltage from output; selects +1.6V or –0.8V reference based on polarity configuration. |
| SS (Pin 3) | Soft-start timing control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO, thermal lockout, or INTVCC fault. |
| RT (Pin 4) | Frequency programming input | Resistor to GND sets switching frequency; open-circuit disables operation - must not be left floating. |
| SYNC (Pin 5) | External clock synchronization input | Accepts digital clock signal; requires RT-set frequency 20% slower than SYNC frequency for reliable locking. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to source-side of sense resistor; monitors switch current for cycle-by-cycle limiting and PWM control. |
| GATE (Pin 7) | N-MOSFET gate driver output | Swings between INTVCC and GND; forced low during shutdown, thermal fault, or INTVCC UV/OV conditions. |
| INTVCC (Pin 8) | Internal LDO output | 7.2V regulated supply for gate driver and logic; bypass with ≥4.7µF ceramic cap; can be externally powered if >7.5V and <17.5V. |
| SHDN/UVLO (Pin 9) | Enable/disable and input UV detection | 1.22V falling threshold with programmable hysteresis; pulls down 2µA to set rising threshold; <0.4V forces shutdown. |
| VIN (Pin 10) | Main input supply | Accepts 5.5V–100V; requires local 0.22µF+ ceramic bypass; powers internal LDO and provides bias for UVLO circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, flyback, SEPIC, and inverting configurations - reduces BOM count and simplifies platform design across multiple output requirements. |
| Dual-Polarity Feedback | FBX pin accepts both positive and negative feedback signals using same reference architecture - eliminates need for separate controllers for bipolar output rails. |
| Programmable UVLO Hysteresis | External resistor divider + 2µA internal current source enables precise turn-on/turn-off voltage windows - critical for stable operation during cold-crank or load-dump events. |
| Frequency Foldback | Reduces switching frequency during overload or short-circuit - limits peak inductor current and prevents thermal runaway without sacrificing protection speed. |
| Thermal-Aware Gate Drive | INTVCC current limit scales with VIN to prevent excessive on-chip dissipation - enables safe driving of high-QG MOSFETs at high frequencies and high input voltages. |
Applications
| Automotive ADAS Power Supply | Industrial Telecom Rectifier |
|---|---|
Use Scenario: 12V–48V battery input powering 5V/3.3V rails for radar ECU, camera module, or domain controller. IC Role / Device Role / Timing Role: Flyback controller regulating isolated 5V output with tight line/load regulation and AEC-Q100 reliability. Use Value: Enables single-chip solution for harsh-environment 48V-to-5V conversion with <1µA shutdown current and thermal foldback during overloads. | Use Scenario: 36V–72V telecom rectifier feeding 12V intermediate bus in base station power system. IC Role / Device Role / Timing Role: Boost controller generating 12V from nominal 48V input with programmable frequency and robust UVLO. Use Value: Delivers stable 12V output across wide input range while meeting telecom efficiency and transient response standards. |
| Wide-Input Industrial Sensor Hub | Inverting Rail Generator |
Use Scenario: Factory automation sensor node powered from 24V–100V DC distribution bus requiring clean 3.3V microcontroller supply. IC Role / Device Role / Timing Role: SEPIC controller providing non-inverting 3.3V output with input dropout tolerance and high-voltage surge immunity. Use Value: Maintains regulation during brownouts and transients up to 100V, eliminating need for front-end pre-regulator or TVS arrays. | Use Scenario: Generating –12V rail from 24V input for op-amp biasing or analog signal conditioning in test equipment. IC Role / Device Role / Timing Role: Inverting controller using FBX's –0.8V reference to regulate negative output with standard resistor divider. Use Value: Eliminates dedicated negative-bias IC; achieves precise –12V regulation with same layout and component set as positive-output variants. |
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 |
|---|---|---|---|
| LTC3891EMSE#PBF | Integrated 75V MOSFET drivers; no external N-FET required; lower max VIN (75V); no negative output support. | Better suited for compact synchronous buck designs where integrated drivers reduce board area; lacks inverting topology capability. | Select when space-constrained buck applications dominate and negative rails are not needed. |
| LM5165QPWPRQ1 | 65V max VIN; integrated 500mA FET; fixed 2.1MHz frequency; no programmable frequency or SYNC; no negative output mode. | Optimized for low-EMI, high-density buck converters in automotive body electronics; lacks topology flexibility and high-voltage headroom. | Choose for cost-sensitive, low-power automotive buck supplies where 65V rating suffices and simplicity outweighs configurability. |
Compared with LTC3891EMSE#PBF and LM5165QPWPRQ1, the LT3758AIDD#TRPBF offers unique 100V input capability, dual-polarity feedback, and full topology flexibility - making it the only option among the three capable of robust flyback, SEPIC, and inverting designs in automotive-grade environments.
Availability
LT3758AIDD#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial telecom rectifiers, and wide-input sensor hubs requiring stable component supply and long-term lifecycle support.
Supply support for LT3758AIDD#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 digital signal processing semiconductors, serving precision, industrial, automotive, and communications markets.
The LT3758A series belongs to Analog Devices' high-voltage DC/DC controller product line, designed specifically for rugged, wide-input-range power conversion in automotive, industrial, and telecom infrastructure applications.
FAQ
What is the maximum input voltage rating for LT3758AIDD#TRPBF?
The LT3758AIDD#TRPBF has an absolute maximum input voltage rating of 100V on the VIN pin, with guaranteed operation from 5.5V to 100V. This enables direct interface with 48V and 72V industrial and automotive battery systems without external pre-regulation. Exceeding 100V risks permanent damage per Absolute Maximum Ratings.
Does LT3758AIDD#TRPBF support negative output voltage generation?
Yes, the LT3758AIDD#TRPBF supports negative output voltage generation using inverting topology. Its FBX pin accepts a –0.8V reference voltage, allowing standard resistor-divider feedback from a negative rail. This eliminates the need for separate inverting controllers and enables unified design across positive and negative output requirements.
How is the switching frequency programmed on LT3758AIDD#TRPBF?
The switching frequency of LT3758AIDD#TRPBF is programmed using an external resistor from the RT pin to GND. Values from 10.5kΩ (1MHz) to 140kΩ (100kHz) set the frequency across the full range. The RT pin must never be left floating - an unconnected RT pin will disable operation per datasheet requirement.
What is the purpose of the SHDN/UVLO pin on LT3758AIDD#TRPBF?
The SHDN/UVLO pin on LT3758AIDD#TRPBF serves dual functions: enabling/disabling the controller (logic-level shutdown below 0.4V) and detecting input undervoltage conditions. Its 1.22V falling threshold and externally programmable hysteresis allow precise control of turn-on/turn-off points - essential for stable operation during automotive cold-crank or brownout events.
Can LT3758AIDD#TRPBF drive high-gate-charge MOSFETs at high frequencies?
Yes, but with thermal constraints. The LT3758AIDD#TRPBF's INTVCC LDO has a VIN-dependent current limit to prevent overheating. At high VIN and high frequency, gate drive current (f × QG) must stay within the INTVCC output capability - refer to the "INTVCC Minimum Output Current vs VIN" graph in the datasheet to select appropriate QG and f combinations.
LT3758AIDD#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)
LT3758AIDD#TRPBF FAQ
1.How can I place an order for LT3758AIDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758AIDD#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 LT3758AIDD#TRPBF reliable?
The price and inventory of LT3758AIDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758AIDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3758AIDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758AIDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758AIDD#TRPBF?
LT3758AIDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758AIDD#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 LT3758AIDD#TRPBF?
For technical support, including LT3758AIDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758AIDD#TRPBF requirements.
6.How does Aetrix verify that LT3758AIDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3758AIDD#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 LT3758AIDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3758AIDD#TRPBF?
All LT3758AIDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758AIDD#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 LT3758AIDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3758AIDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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