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Analog Devices Inc. LT3758IDD#PBF
- Part No.:
- LT3758IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3758IDD#PBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:966
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Product details
Overview
LT3758IDD#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 power systems.
For engineers reviewing the LT3758IDD#PBF datasheet, LT3758IDD#PBF pinout, LT3758IDD#PBF application, or LT3758IDD#PBF equivalent, key selection criteria include input voltage range compatibility, negative/positive output configurability, soft-start programmability, frequency synchronization capability, and thermal performance in DFN-10 packages under high-voltage industrial or automotive conditions.
Technical Context
The LT3758IDD#PBF implements fixed-frequency current-mode control with slope compensation, enabling stable regulation across wide VIN and VOUT ranges. Its dual-reference feedback architecture supports ±0.8V/1.6V FBX thresholds for inverting and non-inverting configurations, respectively, while frequency foldback and overvoltage lockout protect during faults.
It integrates a 7.2V low-dropout regulator (4.5V UVLO, 17.5V OVLO) powering gate drive and internal logic, with INTVCC bypassing requiring ≥4.7µF ceramic capacitance. The SHDN/UVLO pin enables precise undervoltage turn-on/off control using external resistor dividers and a 2µA internal pull-down current source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to 48V telecom, 72V industrial, or 12V–48V automotive battery rails without pre-regulation. |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor; enables trade-off between efficiency (lower f) and magnetics size (higher f). |
| FBX Regulation Voltage | +1.6V or –0.8V - selectable via external divider; allows single-pin programming of positive or negative output voltage. |
| SENSE Threshold | 110mV (typ) - sets peak switch current limit; determines maximum power handling with external sense resistor. |
| Shutdown IQ | <1µA - enables long-term battery backup operation in always-on monitoring or telematics modules. |
| INTVCC Regulator | 7.2V ±0.2V - powers gate driver and internal circuitry; requires ≥4.7µF local bypass for transient gate charge delivery. |
| Package | 10-Lead 3mm × 3mm DFN - exposed pad enhances thermal dissipation (θJA = 43°C/W); suitable for compact high-power density designs. |
Pinout & Package
LT3758IDD#PBF uses a 10-lead 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 11 = GND). The package is RoHS-compliant, lead-free, and rated for –40°C to +125°C junction temperature.
| 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 or –0.8V; modulates frequency during start-up and overcurrent events. |
| SS (Pin 3) | Soft-start timing control | 10µA internal pull-up charges external capacitor; reset by UVLO, INTVCC fault, or thermal shutdown. |
| RT (Pin 4) | Frequency programming input | Resistor-to-GND sets switching frequency; open-circuit disables operation. |
| SYNC (Pin 5) | External clock synchronization | Accepts digital clock signal; RT must be set 20% below SYNC frequency for reliable locking. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to MOSFET source-side sense resistor; triggers immediate switch turn-off above 110mV. |
| 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; 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 via resistor divider. |
| VIN (Pin 10) | Main input supply | Bypass with ≥0.22µF ceramic capacitor; absolute max rating 100V. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Mandatory solder connection to PCB ground plane; primary thermal path for power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage support | Operates directly from 5.5V–100V inputs-eliminates need for pre-regulators in 24V/48V/72V industrial and automotive systems. |
| Single-pin polarity selection | FBX pin accepts either positive or negative feedback networks-reduces BOM count and simplifies design reuse across boost and inverting applications. |
| Programmable soft-start | External capacitor on SS pin controls ramp time-prevents inrush current and limits peak inductor current during startup. |
| Frequency synchronization | SYNC pin locks switching to external clock-enables noise-sensitive system-level EMI reduction and multi-converter phase alignment. |
| AEC-Q100 qualified | Rated for –40°C to +125°C operation with automotive-grade reliability testing-validates use in engine control, ADAS, and infotainment power supplies. |
Applications
| Automotive Infotainment Power | Industrial Telecom PSU |
|---|---|
Use Scenario: Generating isolated ±12V rails from a 12V–48V vehicle battery for audio amplifiers and display controllers. IC Role / Device Role / Timing Role: Flyback controller regulating dual outputs with independent feedback paths via FBX pin configuration. Use Value: Eliminates need for separate positive/negative controllers; AEC-Q100 qualification ensures reliability in vibration-prone environments. | Use Scenario: Non-isolated 24V output from 36V–72V telecom rectified input in base station power modules. IC Role / Device Role / Timing Role: Boost controller operating at 300kHz with synchronized switching to meet EMI compliance requirements. Use Value: 100V absolute max VIN withstands load-dump transients; <1µA shutdown IQ extends backup runtime during AC loss. |
| High-Voltage Industrial Sensor Supply | Medical Imaging Bias Generator |
Use Scenario: Generating +48V bias for industrial Ethernet PHYs or PoE-powered devices from 24V factory bus. IC Role / Device Role / Timing Role: SEPIC controller providing regulated output with input-to-output isolation and reverse-polarity protection. Use Value: Single FBX pin simplifies feedback network; programmable UVLO prevents brownout-induced resets during line sags. | Use Scenario: Negative high-voltage bias (–60V) for photomultiplier tubes in portable ultrasound equipment. IC Role / Device Role / Timing Role: Inverting controller with precision –0.8V FBX reference and frequency foldback during short-circuit events. Use Value: Tight FBX regulation (±1.5mV) ensures stable bias voltage; 220ns minimum on-time enables high step-up ratios at 500kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3758AIDD#PBF | Improved load transient response; identical pinout, specs, and package; same 100V VIN max and –40°C to +125°C rating. | Preferred for dynamic load applications (e.g., radar pulse generators) where output voltage deviation must be minimized during fast current steps. | Select LT3758AIDD#PBF when tighter regulation under transient loads is required; no layout change needed. |
| LT3757EMSE#PBF | Same topology support but lower 65V VIN max; MSOP-10 package (θJA = 40°C/W); lacks AEC-Q100 qualification and FBX negative-reference mode. | Suitable for cost-sensitive industrial 24V/48V systems where automotive qualification and negative output are not required. | Choose LT3757EMSE#PBF only for non-automotive, lower-input-voltage designs where footprint and thermal performance are acceptable trade-offs. |
Compared with LT3758IDD#PBF, LT3758AIDD#PBF delivers superior transient recovery without changing board layout, while LT3757EMSE#PBF reduces cost and size at the expense of input voltage headroom, automotive compliance, and bipolar output capability.
Availability
LT3758IDD#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial telecom power supplies, and high-voltage sensor biasing requiring stable component supply, AEC-Q100 compliance, and wide-input DC/DC control.
Supply support for LT3758IDD#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.
The LT3758 product line delivers high-voltage, current-mode DC/DC controllers optimized for rugged, wide-input applications including automotive power conversion, telecom infrastructure, and industrial automation systems.
FAQ
What is the maximum input voltage rating for LT3758IDD#PBF?
The LT3758IDD#PBF has an absolute maximum input voltage rating of 100V on the VIN pin, making it suitable for direct connection to 72V industrial buses or automotive load-dump transients. Operation is guaranteed from 5.5V to 100V, with internal protection circuits preventing damage beyond this limit. Always observe derating guidelines per the datasheet's Absolute Maximum Ratings table when designing for long-term reliability.
Can LT3758IDD#PBF generate both positive and negative output voltages?
Yes, LT3758IDD#PBF supports both polarities using a single FBX pin: +1.6V reference for positive outputs (boost/flyback/SEPIC) and –0.8V reference for negative outputs (inverting topology). The feedback network configures automatically based on voltage level at FBX, eliminating need for external mode-select pins or additional ICs. This dual-reference capability is confirmed in the Electrical Characteristics table and Applications Information section.
What package type and thermal characteristics does LT3758IDD#PBF use?
LT3758IDD#PBF uses a 10-lead 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 11 = GND). Its junction-to-ambient thermal resistance is 43°C/W when properly soldered to a full copper ground plane. The device is rated for –40°C to +125°C operating junction temperature and includes internal thermal shutdown at 165°C to prevent permanent damage during overload conditions.
How is switching frequency programmed on LT3758IDD#PBF?
Switching frequency on LT3758IDD#PBF is set by connecting a resistor from the RT pin (Pin 4) to GND. Values range from 10.5kΩ (1MHz) to 140kΩ (100kHz), as specified in Table 1 of the datasheet. The RT pin must never be left floating; doing so disables operation. For synchronization, the RT resistor should be selected for a frequency 20% lower than the external SYNC clock to ensure reliable locking.
Is LT3758IDD#PBF qualified for automotive applications?
Yes, LT3758IDD#PBF is AEC-Q100 qualified for automotive applications, rated for operation from –40°C to +125°C. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD robustness. The "I" grade designation in the part number confirms its suitability for under-hood and infotainment systems where reliability under harsh environmental conditions is mandatory.
LT3758IDD#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)
LT3758IDD#PBF FAQ
1.How can I place an order for LT3758IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758IDD#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 LT3758IDD#PBF reliable?
The price and inventory of LT3758IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758IDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3758IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758IDD#PBF?
LT3758IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758IDD#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 LT3758IDD#PBF?
For technical support, including LT3758IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758IDD#PBF requirements.
6.How does Aetrix verify that LT3758IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3758IDD#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 LT3758IDD#PBF meets industry standards.
7.What is the process for return or replacement of LT3758IDD#PBF?
All LT3758IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758IDD#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 LT3758IDD#PBF part is unused and in its original packaging.
Return procedure for LT3758IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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