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Analog Devices Inc. LT3758EDD#PBF
- Part No.:
- LT3758EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3758EDD#PBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,211
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Product details
Overview
LT3758EDD#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 an external N-channel MOSFET 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#PBF datasheet, LT3758EDD#PBF pinout, LT3758EDD#PBF application, or LT3758EDD#PBF equivalent, key selection considerations include input voltage range compatibility, negative/positive output configurability, soft-start programmability, and thermal performance in DFN-10 (3mm × 3mm) packages rated to 125°C junction temperature.
Technical Context
The LT3758EDD#PBF implements fixed-frequency current-mode control with slope compensation, enabling stable regulation across wide VIN and VOUT ranges. Its dual-reference error amplifier (1.6V for positive outputs, –0.8V for negative outputs) allows polarity selection without hardware change.
It integrates a 7.2V LDO regulator (4.5V UVLO, 17.5V OVLO), programmable SHDN/UVLO with hysteresis, frequency foldback during overcurrent, and synchronous clock input with 20% slower RT biasing requirement. Minimum on/off times are both 220ns, limiting 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, 72V industrial, or 100V battery systems without pre-regulation. |
| Feedback Reference | 1.6V (positive output) or –0.8V (negative output) - enables single-pin polarity selection for flexible topology implementation. |
| Switching Frequency | 100kHz to 1MHz (RT-programmable) - balances efficiency vs. magnetics size; 220ns min on/off time constrains max duty cycle at 1MHz. |
| SENSE Threshold | 110mV (typical) - sets peak switch current limit; Kelvin sensing required for accuracy in high-current applications. |
| Shutdown IQ | <1µA - enables long-term battery operation in always-on monitoring or telematics modules. |
| INTVCC Regulator | 7.2V ±0.2V LDO - powers gate driver and internal logic; bypassed with ≥4.7µF ceramic capacitor adjacent to pin. |
| Junction Temp Range | –40°C to 125°C - qualified per AEC-Q100 Grade E, suitable for under-hood automotive power supplies. |
Pinout & Package
LT3758EDD#PBF uses a 10-lead 3mm × 3mm plastic DFN package with exposed pad (Pin 11) soldered to PCB ground for thermal and electrical integrity. θJA = 43°C/W with proper layout.
| 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 | Dual-reference input (1.6V or –0.8V) determines output polarity; also triggers frequency foldback near GND. |
| SS (Pin 3) | Soft-start timing node | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO, INTVCC faults, 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; requires RT bias 20% slower than SYNC frequency; tied to GND if unused. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to source-side of sense resistor; ±0.3V absolute max; 110mV threshold triggers immediate switch turn-off. |
| 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 circuitry; must be bypassed with ≥4.7µF ceramic cap; can be externally powered above 7.5V. |
| SHDN/UVLO (Pin 9) | Enable/disable and input UV detection | 1.22V falling threshold with programmable hysteresis; 0.4V logic-low disables IC and reduces IQ to <1µA. |
| VIN (Pin 10) | Main input supply | Accepts 5.5V–100V; requires local 0.22µF+ ceramic bypass; powers internal LDO and provides reference for UVLO divider. |
| Exposed Pad (Pin 11) | Thermal & electrical ground | Must be soldered to PCB ground plane; serves as GND return and negative terminal for SENSE resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage support | Operates directly from 5.5V to 100V inputs-eliminates need for pre-regulators in 48V/72V industrial and automotive systems. |
| Single-pin output polarity selection | FBX pin accepts either positive or negative feedback networks-enables boost/flyback/SEPIC (positive) or inverting (negative) with identical IC. |
| Programmable soft-start | External capacitor on SS pin controls startup dV/dt-prevents inrush current and output overshoot in high-capacitance loads. |
| Frequency synchronization | SYNC pin accepts external clock up to 1MHz-enables noise-sensitive systems to avoid EMI bands or synchronize multiple converters. |
| AEC-Q100 qualification | Qualified per Grade E (–40°C to 125°C)-meets automotive reliability requirements for engine control, ADAS power rails, and infotainment supplies. |
Applications
| Automotive Power Supply | Industrial Telecom PSU |
|---|---|
|
Use Scenario: 12V/24V/48V battery-fed power conversion for engine control units (ECUs) and body electronics. IC Role / Device Role / Timing Role: Controller for non-isolated flyback or SEPIC converter generating 5V/3.3V rails with input transient tolerance up to 100V. Use Value: Survives load dump (ISO 7637-2 Pulse 5a) without external TVS; AEC-Q100 qualification ensures long-term reliability in under-hood environments. |
Use Scenario: 36V–72V telecom rectified input powering 12V/5V system rails in base station equipment. IC Role / Device Role / Timing Role: Primary controller for isolated flyback supplying isolated bias and logic rails with tight cross-regulation. Use Value: 100V absolute max rating avoids derating concerns; programmable UVLO prevents brownout restarts during AC line sags. |
| High-Voltage Industrial Sensor Hub | Portable Test Equipment Power |
|
Use Scenario: Field-powered sensor nodes operating from 24V–100V industrial bus lines with isolated analog front-ends. IC Role / Device Role / Timing Role: Flyback controller delivering isolated ±15V analog supplies and 3.3V digital rail from single high-voltage input. Use Value: Dual-reference FBX enables simultaneous positive and negative outputs; low shutdown IQ extends battery life in portable configurations. |
Use Scenario: Battery-operated handheld test instruments requiring regulated 5V/±12V rails from Li-ion or 24V packs. IC Role / Device Role / Timing Role: Boost controller generating 5V from 3.0V–4.2V battery, plus inverting stage for –12V analog supply. Use Value: Single-controller dual-polarity capability reduces BOM count; 1µA shutdown IQ preserves battery charge during standby. |
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#PBF | Improved load transient response; tighter FBX regulation (±0.5% vs ±0.8%); same pinout and specs otherwise. | Better suited for fast-dynamic loads like FPGA core rails or RF power amplifiers requiring minimal output deviation. | Select LT3758AEDD#PBF when load step response is critical; otherwise LT3758EDD#PBF offers cost-optimized performance. |
| LM5165QPWPRQ1 | Lower VIN range (3V–65V); integrated 150mA LDO; no negative-output capability; smaller 8-pin WSON package. | Limited to lower-voltage automotive and industrial applications; lacks polarity flexibility and 100V robustness. | Choose LM5165QPWPRQ1 only for space-constrained designs below 65V input where integrated LDO suffices and negative output is unnecessary. |
Compared with LT3758AEDD#PBF, the LT3758EDD#PBF trades minor transient performance for broader legacy design compatibility; versus LM5165QPWPRQ1, it delivers higher input voltage resilience and topology flexibility at the cost of external MOSFET drive and larger footprint.
Availability
LT3758EDD#PBF is available at Aetrix Electronics and suitable for automotive power supplies, industrial telecom PSUs, high-voltage sensor hubs, and portable test equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3758EDD#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 precision instrumentation, industrial automation, communications, and automotive markets.
The LT3758 product line delivers high-voltage DC/DC controllers optimized for ruggedized power conversion in automotive, telecom, and industrial applications where input transients, wide VIN, and topology flexibility are critical.
FAQ
What is the maximum input voltage rating for the LT3758EDD#PBF?
The LT3758EDD#PBF has an absolute maximum input voltage rating of 100V on the VIN pin. This allows direct operation from 48V, 72V, or 100V industrial and automotive battery systems without pre-regulation. Operation above 100V risks permanent damage, and the device includes internal protection against overvoltage on INTVCC (17.5V) and SENSE (±0.3V).
Can the LT3758EDD#PBF generate both positive and negative output voltages?
Yes, the LT3758EDD#PBF supports both polarities using the same FBX pin: a feedback voltage referenced to 1.6V configures boost/flyback/SEPIC for positive outputs, while referencing to –0.8V configures inverting topologies for negative outputs. No external component changes are needed-only the feedback divider network differs.
What package type and thermal characteristics does the LT3758EDD#PBF use?
The LT3758EDD#PBF uses a 10-lead 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 11). With proper PCB copper area and soldering, its junction-to-ambient thermal resistance (θJA) is 43°C/W. The device is rated for –40°C to 125°C operating junction temperature and is AEC-Q100 qualified.
How is switching frequency programmed on the LT3758EDD#PBF?
Switching frequency is set using a resistor from the RT pin (Pin 4) to GND. Values range from 10.5kΩ (1MHz) to 140kΩ (100kHz), with 41.2kΩ yielding ~300kHz. The RT pin must never be left floating. For synchronization, the SYNC pin accepts an external clock, but the RT resistor must be biased for 20% lower frequency than the SYNC signal.
Does the LT3758EDD#PBF include built-in protection features?
Yes, the LT3758EDD#PBF integrates multiple protections: input undervoltage lockout (SHDN/UVLO) with programmable hysteresis, INTVCC UV/OV lockout (4.5V/17.5V), overtemperature shutdown, frequency foldback during short-circuit, and immediate SENSE-based current limiting (110mV threshold). These operate autonomously without external components.
LT3758EDD#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)
LT3758EDD#PBF FAQ
1.How can I place an order for LT3758EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758EDD#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 LT3758EDD#PBF reliable?
The price and inventory of LT3758EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758EDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3758EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758EDD#PBF?
LT3758EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758EDD#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 LT3758EDD#PBF?
For technical support, including LT3758EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758EDD#PBF requirements.
6.How does Aetrix verify that LT3758EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3758EDD#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 LT3758EDD#PBF meets industry standards.
7.What is the process for return or replacement of LT3758EDD#PBF?
All LT3758EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758EDD#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 LT3758EDD#PBF part is unused and in its original packaging.
Return procedure for LT3758EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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