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Analog Devices Inc. LT3758EDD#TRPBF
- Part No.:
- LT3758EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3758EDD#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,187
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Product details
Overview
LT3758EDD#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 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 LT3758EDD#TRPBF datasheet, LT3758EDD#TRPBF pinout, LT3758EDD#TRPBF application, or LT3758EDD#TRPBF equivalent, this controller enables high-voltage industrial power supplies, telecom DC-DC stages, and automotive battery-supplied systems requiring robust input range, negative/positive output flexibility, and precise UVLO hysteresis programming.
Technical Context
The LT3758EDD#TRPBF implements fixed-frequency current-mode control with slope compensation, delivering stable regulation across wide VIN and VOUT ranges. Its dual-reference error amplifier (1.6V for positive outputs, –0.8V for negative) enables topology-agnostic feedback while maintaining ±0.5% FBX regulation accuracy over temperature.
It integrates a 7.2V LDO with 4.5V UVLO (0.5V hysteresis) and 17.5V OVLO, supports frequency synchronization with 20% RT offset, and includes frequency foldback during overcurrent to limit peak inductor current. The 220ns minimum on/off time constrains maximum duty cycle at high frequencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to 48V telecom, 24V/48V automotive, and industrial HV rails without pre-regulation. |
| FBX Regulation Voltage | +1.6V or –0.8V - enables single-pin configuration of positive or negative output voltage without external logic or mode pins. |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor; allows trade-off between efficiency (lower f) and magnetics size (higher f). |
| SENSE Threshold | 110mV (typ) - defines peak switch current limit; sets maximum power delivery and short-circuit protection level. |
| Shutdown IQ | <1µA - enables long-term battery backup operation in always-on monitoring or safety-critical systems. |
| INTVCC Regulator | 7.2V ±0.2V - powers gate driver and internal circuitry; bypassed with ≥4.7µF ceramic capacitor for transient gate drive current. |
| Package | 10-Lead 3mm × 3mm DFN (DD) with exposed pad - θJA = 43°C/W; requires soldered GND pad for thermal reliability. |
Pinout & Package
LT3758EDD#TRPBF uses a 10-lead 3mm × 3mm plastic DFN package (DD) with exposed thermal pad (Pin 11, GND). The exposed pad must be soldered to PCB ground plane for thermal performance and current sense return path 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) | Positive/negative feedback input | Sets output regulation point at +1.6V (boost/flyback/SEPIC) or –0.8V (inverting); modulates frequency during start-up/fault. |
| 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; open-circuit disables operation; 41.2kΩ yields ~300kHz. |
| SYNC (Pin 5) | External clock synchronization input | Accepts digital clock signal; RT must be set 20% slower than SYNC frequency; tied to GND if unused. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to source-side of sense resistor; monitors switch current for PWM and overcurrent protection. |
| GATE (Pin 7) | N-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; bypass 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; 0.4V logic-low disables IC and reduces IQ to <1µA. |
| VIN (Pin 10) | Main input supply | 5.5V–100V input; bypass with ≥0.22µF ceramic capacitor near pin; powers internal LDO and logic. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | 5.5V–100V operation eliminates need for pre-regulators in 48V telecom, 24V/48V automotive, and industrial HV systems. |
| Single-pin positive/negative output selection | FBX pin accepts either +1.6V or –0.8V reference-no additional mode pins or external logic required for topology reconfiguration. |
| Programmable UVLO with hysteresis | SHDN/UVLO pin enables accurate turn-on/turn-off thresholds using external resistors; hysteresis prevents oscillation near trip points. |
| Frequency foldback under overload | Reduces switching frequency during overcurrent or short-circuit events to limit peak inductor current and prevent saturation. |
| AEC-Q100 qualified (Grade E) | Rated for –40°C to +125°C junction temperature; validated for automotive power modules, ADAS sensors, and infotainment supplies. |
Applications
| Automotive Battery Management | Telecom DC-DC Conversion |
|---|---|
|
Use Scenario: 12V/24V/48V vehicle battery supplies powering infotainment head units requiring isolated 5V/3.3V rails. IC Role / Device Role / Timing Role: Flyback controller generating isolated output; uses internal 7.2V LDO to drive primary-side MOSFET; FBX referenced to secondary-side feedback. Use Value: 100V absolute max VIN withstands load-dump transients; <1µA shutdown IQ preserves battery life during vehicle sleep mode. |
Use Scenario: 36V–72V telecom rectified input powering intermediate 12V bus for line cards and optical modules. IC Role / Device Role / Timing Role: Boost controller operating at 300kHz; RT resistor sets frequency; SENSE monitors peak current for constant-power regulation. Use Value: Wide 5.5V–100V input accommodates brownout and overvoltage conditions; programmable UVLO ensures clean startup after AC loss. |
| Industrial High-Voltage Power Supply | Inverting Rail Generator |
|
Use Scenario: Factory automation PLCs requiring 24V output from unregulated 40V–90V industrial DC bus. IC Role / Device Role / Timing Role: SEPIC controller enabling non-inverting output with input-to-output isolation; VC compensation stabilizes loop across wide duty cycle range. Use Value: 220ns minimum on/off time supports high-frequency operation up to 1MHz for compact magnetics; exposed DFN pad enables thermal management at 125°C ambient. |
Use Scenario: Medical imaging subsystem needing –5V rail from existing +12V supply for analog front-end biasing. IC Role / Device Role / Timing Role: Inverting controller with FBX pulled to –0.8V; GATE drives low-side N-MOSFET; SENSE monitors switch current for regulation. Use Value: Single FBX pin eliminates need for polarity-select logic; 110mV SENSE threshold enables precise current limiting on small sense resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-input-voltage controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3758AEDD#TRPBF | Improved load transient response; tighter FBX regulation tolerance (±0.3% vs ±0.5%); identical pinout and electrical specs otherwise. | Better suited for dynamic load applications like servo drives or fast-switching ADC supplies where output voltage deviation must be minimized. | Select LT3758AEDD#TRPBF when faster transient recovery and tighter output regulation are required; drop-in replacement with no layout change. |
| LT3757EMSE#TRPBF | Same architecture but in MSOP-10 package; 150°C max junction temperature; lacks AEC-Q100 qualification; identical functional spec except higher θJA (40°C/W). | Preferred for high-temperature industrial environments where DFN thermal pad mounting is impractical or board space permits larger MSOP footprint. | Choose LT3757EMSE#TRPBF only when AEC-Q100 is not required and MSOP mechanical fit is acceptable; verify thermal margin with θJA = 40°C/W. |
Compared with LT3758EDD#TRPBF, the LT3758AEDD#TRPBF offers superior transient performance for demanding loads, while the LT3757EMSE#TRPBF trades automotive qualification and DFN thermal efficiency for MSOP manufacturability and extended temperature rating-neither requires PCB redesign.
Availability
LT3758EDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery management, telecom DC-DC conversion, and industrial high-voltage power supplies requiring stable component supply, long lifecycle support, and AEC-Q100 compliance.
Supply support for LT3758EDD#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 is part of Analog Devices' high-voltage DC/DC controller product line, designed specifically for ruggedized power conversion in automotive, telecom, and industrial applications where wide input range, topology flexibility, and robust protection are essential.
FAQ
What is the maximum input voltage rating for the LT3758EDD#TRPBF?
The LT3758EDD#TRPBF has an absolute maximum input voltage rating of 100V on the VIN pin, with guaranteed operation from 5.5V to 100V. This allows direct interface with 48V telecom systems, 24V/48V automotive batteries, and industrial HV rails without external pre-regulation. Exceeding 100V risks permanent damage per Absolute Maximum Ratings.
Can the LT3758EDD#TRPBF generate both positive and negative output voltages?
Yes, the LT3758EDD#TRPBF supports both polarities using a single FBX pin: it regulates to +1.6V for boost, flyback, or SEPIC configurations (positive output), and to –0.8V for inverting converter topologies (negative output). No external mode-select circuitry is needed-the feedback divider determines polarity automatically.
What package type and thermal characteristics does the LT3758EDD#TRPBF use?
The LT3758EDD#TRPBF uses a 10-lead 3mm × 3mm plastic DFN (DD) package with exposed thermal pad (Pin 11, GND). Its junction-to-ambient thermal resistance is 43°C/W when the exposed pad is properly soldered to a full PCB ground plane, enabling reliable operation up to +125°C junction temperature.
How is the switching frequency programmed on the LT3758EDD#TRPBF?
The LT3758EDD#TRPBF switching frequency is set using an external resistor from the RT pin (Pin 4) to GND. A 41.2kΩ resistor yields ~300kHz; values from 10.5kΩ (1MHz) to 140kΩ (100kHz) are supported. Leaving RT open disables operation. For synchronization, RT must be set 20% slower than the external SYNC clock frequency.
Is the LT3758EDD#TRPBF qualified for automotive applications?
Yes, the LT3758EDD#TRPBF is AEC-Q100 qualified (Grade E) for automotive applications, rated for operation from –40°C to +125°C junction temperature. It meets stringent reliability, thermal, and ESD requirements for use in battery management systems, ADAS power supplies, and infotainment modules.
LT3758EDD#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)
LT3758EDD#TRPBF FAQ
1.How can I place an order for LT3758EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758EDD#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 LT3758EDD#TRPBF reliable?
The price and inventory of LT3758EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3758EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758EDD#TRPBF?
LT3758EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758EDD#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 LT3758EDD#TRPBF?
For technical support, including LT3758EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758EDD#TRPBF requirements.
6.How does Aetrix verify that LT3758EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3758EDD#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 LT3758EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3758EDD#TRPBF?
All LT3758EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758EDD#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 LT3758EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3758EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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