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Analog Devices Inc. LT3757AEDD#PBF
- Part No.:
- LT3757AEDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3757AEDD#PBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:957
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Product details
Overview
LT3757AEDD#PBF from Analog Devices is a wide-input current-mode DC/DC controller supporting boost, flyback, SEPIC, and inverting topologies with single-feedback-pin polarity selection. It operates from 2.9V to 40V input, delivers programmable 50kHz–1MHz switching frequency via RT resistor, and integrates a 7.2V LDO for gate drive - enabling high-efficiency battery-powered or automotive power supplies.
For engineers reviewing the LT3757AEDD#PBF datasheet, LT3757AEDD#PBF pinout, LT3757AEDD#PBF application, or LT3757AEDD#PBF equivalent, key selection criteria include its dual-polarity feedback capability (±1.6V/−0.8V FBX regulation), <1µA shutdown current, AEC-Q100 qualification, and validated 10-lead DFN (3mm × 3mm) thermal performance at 125°C junction temperature.
Technical Context
The LT3757AEDD#PBF implements fixed-frequency current-mode control with slope compensation, where SENSE voltage (110mV typ.) and VC error amplifier output jointly determine MOSFET on-time. Its dual-comparator FBX architecture enables seamless positive- or negative-output configuration without external reconfiguration.
Internal 7.2V LDO powers the gate driver and logic; INTVCC UVLO (2.7V) and OVLO (17.5V) protect gate drive integrity, while SYNC pin allows external clock synchronization with 20% slower RT-programmed base frequency - ensuring deterministic timing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 40V - supports direct connection to 12V/24V automotive rails and single-cell Li+ batteries. |
| Switching Frequency | 50kHz 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 - single-pin polarity selection eliminates need for separate positive/negative feedback networks. |
| SENSE Threshold | 110mV (typ.) - defines peak switch current limit; enables precise overcurrent protection with low-loss sense resistors. |
| Shutdown Current | <1µA - extends battery life in always-on monitoring or sleep-mode applications. |
| INTVCC LDO Output | 7.2V ±0.2V - powers external N-channel MOSFET gate driver; bypassed with ≥4.7µF ceramic capacitor. |
| Operating Temp Range | −40°C to +125°C - qualified per AEC-Q100 Grade E for under-hood automotive use. |
Pinout & Package
LT3757AEDD#PBF uses a thermally enhanced 10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11) soldered to PCB ground for optimal thermal dissipation (θJA = 43°C/W). The exposed pad serves as both thermal path and SENSE return reference.
| 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 | Dual-reference input (1.6V for positive VOUT, −0.8V for negative VOUT) enables topology flexibility without hardware change. |
| SS (Pin 3) | Soft-start control | 10µA internal pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO or thermal fault. |
| RT (Pin 4) | Frequency programming | Resistor-to-GND sets oscillator frequency; open-circuit disables operation. |
| SYNC (Pin 5) | External clock sync input | Accepts digital clock; requires RT-set frequency 20% lower than SYNC signal for reliable locking. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to MOSFET source-side sense resistor; referenced to exposed pad (GND). |
| GATE (Pin 7) | N-channel MOSFET driver output | Swings between INTVCC and GND; forced low during shutdown, thermal lockout, or INTVCC fault. |
| INTVCC (Pin 8) | Internal LDO output | 7.2V regulated supply for gate driver and internal logic; must be bypassed with ≥4.7µF ceramic cap. |
| SHDN/UVLO (Pin 9) | Enable and input UVLO control | 1.22V falling threshold with programmable hysteresis; pulls VIN IQ below 1µA when ≤0.4V. |
| VIN (Pin 10) | Main input supply | 2.9V–40V input; requires local 0.22µF+ ceramic bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, flyback, SEPIC, and inverting converters via FBX polarity detection - reduces BOM count across power architectures. |
| Load Transient Improvement | LT3757A variant delivers faster load step response vs. LT3757 - critical for dynamic loads like LED drivers or RF power amplifiers. |
| Thermal Robustness | Exposed-pad DFN package with 43°C/W θJA enables >2A output current in compact layouts without heatsinks. |
| System-Level Protection | Integrated frequency foldback, FBX overvoltage lockout (±8–11%), and INTVCC UV/OV thresholds prevent catastrophic failure during faults. |
| Automotive Compliance | AEC-Q100 Grade E qualification ensures reliability in harsh environments - validated for 125°C junction operation and thermal cycling. |
Applications
| Automotive LED Headlamp Driver | Industrial Isolated Flyback PSU |
|---|---|
|
Use Scenario: Driving high-brightness LEDs from 12V vehicle battery with dimming and short-circuit protection. IC Role / Device Role / Timing Role: Boost controller regulating constant current via SENSE feedback; FBX configured for positive output. Use Value: 110mV current-sense threshold enables <5mΩ sense resistor, minimizing power loss and thermal stress in confined headlamp housings. |
Use Scenario: Generating isolated 15V/1A auxiliary supply from 24V factory bus with reinforced insulation. IC Role / Device Role / Timing Role: Primary-side flyback controller using transformer-coupled feedback; FBX referenced to secondary via optocoupler divider. Use Value: 50kHz–1MHz programmable frequency allows optimization for EMI compliance (e.g., 300kHz avoids AM band) while maintaining tight regulation. |
| Portable Medical Instrument Power | Battery-Powered IoT Sensor Node |
|
Use Scenario: Providing stable ±5V rails from single 3.7V Li-ion cell for analog front-end and microcontroller. IC Role / Device Role / Timing Role: Inverting converter generating negative rail; FBX pulled to −0.8V reference for polarity selection. Use Value: <1µA shutdown current extends shelf life of sealed medical devices; 2.9V minimum VIN enables full battery utilization down to 3.0V. |
Use Scenario: Ultra-low-power boost converter powering LoRaWAN transceiver from coin cell during periodic transmission bursts. IC Role / Device Role / Timing Role: High-efficiency boost controller with soft-start limiting inrush into large output capacitance. Use Value: Programmable soft-start (via SS capacitor) prevents brownout during cold-start; 7.2V INTVCC ensures robust gate drive even at 2.9V VIN. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757EDD#PBF | Base variant with slower load transient response; identical pinout, package, and core specs. | Lacks LT3757A's improved transient performance - suitable for static loads like display bias supplies. | Select LT3757EDD#PBF only if cost sensitivity outweighs dynamic performance requirements. |
| LM5122MMX/NOPB | Wide-input synchronous boost/flyback controller; includes integrated high-side gate driver and 5V LDO. | Requires external bootstrap circuitry for high-side N-FET; lacks native inverting topology support. | Choose LM5122MMX/NOPB when synchronous rectification is mandatory and topology is limited to boost/flyback. |
Compared with LT3757EDD#PBF, the LT3757AEDD#PBF offers measurable improvement in load step recovery time, making it preferable for LED drivers and RF PA supplies; versus LM5122MMX/NOPB, LT3757AEDD#PBF provides broader topology coverage (including SEPIC/inverting) and lower quiescent current, but requires external N-FET and gate driver.
Availability
LT3757AEDD#PBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial flyback PSUs, portable medical instruments, and battery-powered IoT sensor nodes requiring stable component supply with AEC-Q100 assurance.
Supply support for LT3757AEDD#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, and automotive markets.
The LT3757A series belongs to Analog Devices' high-voltage DC/DC controller product line, designed specifically for rugged, flexible power conversion in automotive, industrial, and telecom applications where input range, topology agility, and reliability are critical.
FAQ
What is the key functional difference between LT3757AEDD#PBF and LT3757EDD#PBF?
The LT3757AEDD#PBF features improved load transient response compared to the LT3757EDD#PBF, as confirmed in the datasheet's "Features" section and typical performance curves. Both share identical pinout, package, operating voltage range, and core control architecture - but LT3757AEDD#PBF delivers tighter output regulation during rapid load steps, making it preferred for LED drivers and RF power stages where dynamic stability is critical.
Can LT3757AEDD#PBF be used in an inverting buck-boost configuration?
Yes, LT3757AEDD#PBF supports inverting converter topologies via its dual-reference FBX pin (−0.8V regulation for negative outputs). When configured as an inverter, the feedback divider pulls FBX to −0.8V, activating comparator A2 for noninverting amplification to VC - enabling clean negative rail generation from positive inputs without additional ICs or level-shifting circuitry.
What is the minimum recommended capacitor for INTVCC bypassing on LT3757AEDD#PBF?
The datasheet specifies a minimum 4.7µF ceramic capacitor placed adjacent to the INTVCC and GND pins for LT3757AEDD#PBF. This value ensures sufficient charge reservoir for high di/dt gate drive currents, especially at frequencies above 300kHz or with MOSFETs having QG > 20nC. Lower values risk INTVCC droop, triggering soft-start or cycle-by-cycle current limiting.
Does LT3757AEDD#PBF require external components to enable AEC-Q100 compliance?
No - AEC-Q100 qualification is inherent to the LT3757AEDD#PBF device itself, as stated in the "Features" and "Order Information" sections. The part number suffix "#PBF" denotes lead-free finish, and the E-grade temperature range (−40°C to +125°C) is factory-tested and certified. No external components or layout modifications are required to meet AEC-Q100 requirements.
How does the SYNC pin function when RT is not connected on LT3757AEDD#PBF?
If RT is left unconnected, LT3757AEDD#PBF will not operate - the RT pin must have a resistor to GND for oscillator startup. The SYNC pin is ignored unless RT is properly configured and FBX is not near GND. With RT floating, the IC remains nonfunctional regardless of SYNC signal presence; this is explicitly noted in the "PIN FUNCTIONS" section of the datasheet.
LT3757AEDD#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 and Negative
- Topology:
- Boost, Flyback, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.9V ~ 40V
- 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)
LT3757AEDD#PBF FAQ
1.How can I place an order for LT3757AEDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757AEDD#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 LT3757AEDD#PBF reliable?
The price and inventory of LT3757AEDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757AEDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3757AEDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757AEDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757AEDD#PBF?
LT3757AEDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757AEDD#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 LT3757AEDD#PBF?
For technical support, including LT3757AEDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757AEDD#PBF requirements.
6.How does Aetrix verify that LT3757AEDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3757AEDD#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 LT3757AEDD#PBF meets industry standards.
7.What is the process for return or replacement of LT3757AEDD#PBF?
All LT3757AEDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757AEDD#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 LT3757AEDD#PBF part is unused and in its original packaging.
Return procedure for LT3757AEDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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