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Analog Devices Inc. LT3758AEDD#PBF
- Part No.:
- LT3758AEDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3758AEDD#PBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,680
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Product details
Overview
LT3758AEDD#PBF 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 via a 7.2V internal LDO, features programmable 100kHz–1MHz switching frequency, <1µA shutdown current, and AEC-Q100 qualification for automotive use.
For engineers reviewing the LT3758AEDD#PBF datasheet, LT3758AEDD#PBF pinout, LT3758AEDD#PBF application, or LT3758AEDD#PBF equivalent, this page delivers verified topology flexibility, precise undervoltage lockout programming, soft-start control, frequency synchronization capability, and thermal-aware gate drive limitations - all critical for high-reliability industrial and automotive power supply design.
Technical Context
The LT3758AEDD#PBF implements fixed-frequency current-mode control with slope compensation, enabling stable operation across wide VIN and VOUT ranges. Its dual-reference error amplifier (1.6V for positive outputs, –0.8V for negative outputs) allows single-pin feedback polarity selection without external logic.
It integrates a 7.2V low-dropout regulator (4.5V UVLO, 17.5V OVLO) to power internal circuitry and gate driver, with programmable SHDN/UVLO thresholds (1.22V nominal falling threshold, 2µA pull-down for hysteresis setting) and frequency foldback during overcurrent events to limit peak inductor current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to 24V/48V industrial buses and 12V/24V automotive batteries with transient tolerance. |
| Switching Frequency | 100kHz to 1MHz (RT-programmable) - enables trade-off between efficiency (lower f) and magnetics size (higher f). |
| SENSE Threshold | 110mV (typical) - sets accurate current limit for external sense resistor, critical for overcurrent protection in high-power converters. |
| FBX Regulation Voltage | +1.6V or –0.8V - selectable via output configuration; defines regulation point for both positive and negative output topologies. |
| Shutdown IQ | <1µA - preserves battery life in always-on automotive modules and remote sensors. |
| INTVCC Regulator | 7.2V ±0.2V - powers gate driver and internal logic; bypassed by ≥4.7µF ceramic capacitor adjacent to pin. |
| Operating Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade E, suitable for under-hood automotive environments. |
Pinout & Package
LT3758AEDD#PBF 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 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. |
| FBX (Pin 2) | Positive/negative feedback input | Sets output regulation point at +1.6V (boost/flyback/SEPIC) or –0.8V (inverting); modulates frequency during faults. |
| SS (Pin 3) | Soft-start timing input | 10µA internal pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO or thermal fault. |
| RT (Pin 4) | Frequency programming node | 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 set to 20% lower than SYNC frequency for reliable locking. |
| SENSE (Pin 6) | Current sense amplifier input | Kelvin-connected to source-side of sense resistor; monitors 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. |
| 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 | Accepts 5.5V–100V; requires local 0.22µF+ ceramic bypass; powers internal LDO and provides reference for UVLO. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, flyback, SEPIC, and inverting configurations - reduces BOM count and simplifies platform power architecture. |
| Programmable UVLO with Hysteresis | Accurate 1.22V falling threshold + user-defined hysteresis via external resistor divider - ensures clean start-up across variable input rails. |
| Frequency Synchronization | SYNC pin accepts external clock up to 1MHz - enables noise-sensitive systems (e.g., ADAS cameras) to avoid EMI bands. |
| Thermal-Aware Gate Drive | INTVCC current limit scales with VIN; combined with θJA = 43°C/W and exposed pad - enables robust thermal design in compact layouts. |
| AEC-Q100 Qualified | Grade E (–40°C to +125°C) qualification - meets automotive reliability requirements for engine control, lighting, and infotainment subsystems. |
Applications
| Automotive Front-End Power Supply | Industrial Telecom Rectifier |
|---|---|
Use Scenario: 24V battery-fed power module supplying isolated 5V/3.3V rails for ADAS ECUs and radar processors. IC Role / Device Role / Timing Role: Flyback controller regulating isolated output with primary-side sensing; synchronizes to system clock to suppress conducted EMI. Use Value: AEC-Q100 qualification ensures operation at 125°C junction temperature; 100V absolute max rating withstands load-dump transients. |
Use Scenario: 48V telecom rectifier converting -48V input to +12V intermediate bus for PoE switches and baseband units. IC Role / Device Role / Timing Role: Inverting controller generating positive output from negative input; uses FBX's –0.8V reference for precision regulation. Use Value: Wide 5.5V–100V input range accommodates brownout and overvoltage conditions; <1µA shutdown IQ extends backup battery runtime. |
| Wide-Input Industrial Sensor Hub | High-Voltage Test Equipment Supply |
Use Scenario: Field-deployed sensor node powered from unregulated 12–72V DC distribution bus, requiring stable 3.3V for MCU and analog front-end. IC Role / Device Role / Timing Role: SEPIC controller providing non-inverting regulated output with input/output isolation; soft-start prevents inrush into capacitive loads. Use Value: Programmable RT resistor enables optimization for low-noise operation at 300kHz; 110mV SENSE threshold supports high-accuracy current limiting. |
Use Scenario: Benchtop test instrument requiring adjustable 100V output from 24V lab supply for component stress testing. IC Role / Device Role / Timing Role: Boost controller operating at 100kHz with external MOSFET and high-voltage diode; frequency foldback protects during short-circuit. Use Value: 100V VIN rating eliminates need for pre-regulator stage; internal 7.2V LDO simplifies gate drive design versus discrete bootstrap solutions. |
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 |
|---|---|---|---|
| LTC3895EMSE#PBF | Fixed 150kHz frequency, no RT/SYNC pins; integrated gate drivers for dual-phase operation; higher quiescent current (15µA shutdown). | Targeted at synchronous buck controllers for CPU/GPU VRMs - lacks flyback/inverting support and 100V input rating. | Select LTC3895 only for fixed-frequency, multi-phase buck applications where topology and voltage range match. |
| LM5165QPWPRQ1 | Integrated 65V MOSFET, 100kHz–2.2MHz frequency, 3.5µA shutdown IQ; no negative-output capability or programmable UVLO hysteresis. | Optimized for compact, low-component-count buck regulators in automotive body electronics - not suitable for isolated or inverting topologies. | Choose LM5165Q1 only when integrated FET, smaller footprint, and simpler biasing outweigh need for topology flexibility and 100V operation. |
Compared with LTC3895EMSE#PBF and LM5165QPWPRQ1, the LT3758AEDD#PBF uniquely combines 100V input capability, dual-polarity feedback, programmable frequency/sync, and AEC-Q100 qualification - making it the sole option for automotive-grade, isolated, or inverting high-voltage converter designs requiring field-programmable thresholds and robust transient handling.
Availability
LT3758AEDD#PBF is available at Aetrix Electronics and suitable for automotive front-end supplies, industrial telecom rectifiers, wide-input sensor hubs, and high-voltage test equipment requiring stable component supply and long-term lifecycle support.
Supply support for LT3758AEDD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LT3758A series belongs to Analog Devices' high-voltage DC/DC controller product line, designed specifically for rugged, flexible power conversion in automotive and industrial environments where input transients, wide voltage ranges, and topology adaptability are critical.
FAQ
What topology configurations does the LT3758AEDD#PBF support?
The LT3758AEDD#PBF supports boost, flyback, SEPIC, and inverting converter topologies using a single feedback pin (FBX) that references either +1.6V for positive outputs or –0.8V for negative outputs. Its current-mode architecture with slope compensation ensures stability across all configurations. The LT3758AEDD#PBF does not support buck or synchronous rectification natively - external components and layout define topology implementation.
How is the switching frequency programmed on the LT3758AEDD#PBF?
The LT3758AEDD#PBF switching frequency is set by connecting an external resistor (RT) from Pin 4 (RT) to GND. Values from 10.5kΩ (1MHz) to 140kΩ (100kHz) yield corresponding frequencies per the datasheet table. The RT pin must never be left floating. For synchronization, the SYNC pin accepts an external clock, but the RT resistor must be selected for a frequency 20% lower than the SYNC signal to ensure reliable locking.
What is the purpose of the SHDN/UVLO pin on the LT3758AEDD#PBF?
The SHDN/UVLO pin (Pin 9) serves dual functions: it enables/disables the LT3758AEDD#PBF via logic-level control (<0.4V = shutdown), and it monitors input voltage for undervoltage lockout using a precise 1.22V falling threshold. An internal 2µA pull-down current allows users to program hysteresis with external resistors - ensuring clean turn-on/turn-off behavior during brownout conditions. This pin also resets soft-start during UV events.
Can the LT3758AEDD#PBF drive high-gate-charge MOSFETs reliably?
The LT3758AEDD#PBF gate driver is rated for typical rise/fall times of 22ns/20ns into 3300pF, but its ability to drive high-QG MOSFETs depends on VIN, frequency, and thermal design. The internal 7.2V LDO has a current limit that decreases with increasing VIN (e.g., ~11mA at VIN=100V). To sustain reliable operation, users must verify INTVCC remains ≥4.7V using Figure 2 (QG vs VIN) from the datasheet and ensure junction temperature stays ≤125°C with proper PCB copper area under the exposed pad.
Is the LT3758AEDD#PBF pin-compatible with the standard LT3758EDD#PBF?
Yes - the LT3758AEDD#PBF is a direct replacement for the LT3758EDD#PBF in the same DFN package, sharing identical pinout, electrical specifications, and functional behavior. The "A" suffix denotes improved load transient performance and tighter parameter tolerances (e.g., enhanced FBX regulation accuracy and reduced SENSE threshold drift over temperature), but no PCB or schematic changes are required for migration.
LT3758AEDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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)
LT3758AEDD#PBF FAQ
1.How can I place an order for LT3758AEDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758AEDD#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 LT3758AEDD#PBF reliable?
The price and inventory of LT3758AEDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758AEDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3758AEDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758AEDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758AEDD#PBF?
LT3758AEDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758AEDD#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 LT3758AEDD#PBF?
For technical support, including LT3758AEDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758AEDD#PBF requirements.
6.How does Aetrix verify that LT3758AEDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3758AEDD#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 LT3758AEDD#PBF meets industry standards.
7.What is the process for return or replacement of LT3758AEDD#PBF?
All LT3758AEDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758AEDD#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 LT3758AEDD#PBF part is unused and in its original packaging.
Return procedure for LT3758AEDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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