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Analog Devices Inc. LT3757AEDD#TRPBF
- Part No.:
- LT3757AEDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3757AEDD#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,693
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Product details
Overview
LT3757AEDD#TRPBF from Analog Devices is a wide-input current-mode DC/DC controller for boost, flyback, SEPIC, and inverting topologies, driving external N-channel MOSFETs with an internal 7.2V LDO gate driver. It operates from 2.9V to 40V input, supports ±0.8V/1.6V feedback regulation, delivers programmable 50kHz–1MHz switching, and features <1µA shutdown current - ideal for automotive battery-powered LED drivers and telecom power supplies.
For engineers reviewing the LT3757AEDD#TRPBF datasheet, LT3757AEDD#TRPBF pinout, LT3757AEDD#TRPBF application, or LT3757AEDD#TRPBF equivalent, key selection criteria include its dual-polarity feedback capability, frequency synchronization support, soft-start programmability, and AEC-Q100 qualification for automotive-grade reliability under –40°C to 125°C junction conditions.
Technical Context
The LT3757AEDD#TRPBF implements fixed-frequency current-mode control with slope compensation, enabling stable operation across wide VIN and VOUT ranges. Its error amplifier supports both positive (1.6V) and negative (–0.8V) FBX reference modes, and frequency foldback limits inductor current during startup or short-circuit faults.
It integrates a 7.2V low-dropout regulator for gate drive, programmable UVLO with hysteresis on SHDN/UVLO, and internal overvoltage protection on FBX (±8–11% thresholds). The SYNC pin accepts external clocks, requiring RT programming 20% below sync frequency for reliable locking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 40V - enables direct operation from 3.3V logic rails up to 36V automotive batteries without pre-regulation. |
| Feedback Reference | +1.6V or –0.8V - allows single-pin configuration of positive- or negative-output converters without external op-amps. |
| Switching Frequency | 50kHz to 1MHz via RT resistor - balances efficiency (lower f) vs. size (higher f); minimum on/off time = 220ns limits max frequency at low duty cycles. |
| Shutdown Current | <1µA - preserves battery life in always-on automotive modules during sleep mode. |
| INTVCC Regulator | 7.2V ±0.2V, 95mA max - powers gate driver and internal circuitry; dropout voltage = 400mV at 20mA ensures robustness at low VIN. |
| SENSE Threshold | 110mV typical - sets peak switch current limit; tolerance ±10mV enables accurate current sensing with 1% sense resistors. |
| Operating Temp Range | –40°C to +125°C (junction) - qualified per AEC-Q100 Grade 1 for under-hood automotive applications. |
Pinout & Package
LT3757AEDD#TRPBF uses a thermally enhanced 10-lead 3mm × 3mm DFN package (DD) with exposed pad (Pin 11) soldered to PCB ground for thermal management (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (1) | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; clamped during soft-start and fault conditions. |
| FBX (2) | Positive/negative feedback input | Sets output regulation point: 1.6V for positive outputs, –0.8V for inverting configurations; triggers frequency foldback near GND. |
| SS (3) | Soft-start timing control | External capacitor sets ramp time; internal 10µA pull-up to 2.5V rail enables precise start-up current limiting. |
| RT (4) | Frequency programming input | Resistor to GND sets oscillator frequency; open-circuit disables operation - must not float. |
| SYNC (5) | External clock synchronization input | Accepts digital clock signal; requires RT setting 20% slower than sync frequency for lock-in; ignored when FBX ≈ GND. |
| SENSE (6) | Current sense comparator input | Kelvin-connected to MOSFET source-side sense resistor; ±0.3V absolute max; detects overcurrent at 110mV threshold. |
| GATE (7) | N-channel MOSFET gate driver output | Swings between INTVCC and GND; actively pulled low during shutdown, thermal fault, or INTVCC UV/OV events. |
| INTVCC (8) | Internal LDO output (7.2V) | Powers gate driver and internal logic; bypass with ≥4.7µF ceramic cap; can be externally powered if >7.5V and <17.5V. |
| SHDN/UVLO (9) | Enable/disable and input UVLO input | 1.22V falling threshold with programmable hysteresis; pulls VIN IQ <1µA when ≤0.4V; resets soft-start on undervoltage. |
| VIN (10) | Main input supply | 2.9V–40V range; bypass with ≥0.22µF ceramic cap close to pin; powers internal LDO and logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity feedback architecture | Single FBX pin supports both +1.6V (boost/flyback/SEPIC) and –0.8V (inverting) regulation without external components. |
| Programmable frequency foldback | Reduces switching frequency during overload or short-circuit, limiting peak inductor current and preventing thermal runaway. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use across –40°C to +125°C junction temperature with full production testing and reliability reporting. |
| Low-quiescent-current shutdown | Shuts down entire controller with <1µA VIN supply current - critical for battery-backed systems requiring multi-year standby life. |
| Integrated 7.2V LDO with UV/OV protection | Provides regulated gate drive while disabling GATE output if INTVCC drops below 2.7V or exceeds 17.5V, protecting MOSFET gates. |
Applications
| Automotive LED Headlamp Driver | Industrial Telecom Power Supply |
|---|---|
Use Scenario: Driving high-brightness LEDs from 12V vehicle battery with dimming and fault protection. IC Role / Device Role / Timing Role: Boost controller regulating constant current through external MOSFET and sense resistor; FBX configured for positive output. Use Value: Enables compact, efficient design with AEC-Q100 compliance, programmable soft-start to avoid inrush, and overvoltage lockout during load dump transients. | Use Scenario: Generating isolated –48V bias rail from 24V intermediate bus in telecom line cards. IC Role / Device Role / Timing Role: Inverting controller using FBX in negative-reference mode; drives external N-MOSFET with synchronous rectification. Use Value: Eliminates need for separate inverting IC or op-amp feedback network; achieves tight regulation over wide load range with current-mode stability. |
| Portable Medical Imaging Power | Industrial Sensor Signal Conditioning |
Use Scenario: Powering CCD/CMOS image sensors requiring low-noise ±15V rails from single-cell Li-ion battery. IC Role / Device Role / Timing Role: Dual-output SEPIC controller generating both positive and negative regulated outputs from 3.0–4.2V input. Use Value: Supports battery operation down to 2.9V VIN; soft-start prevents sensor reset during wake-up; <1µA shutdown extends device runtime. | Use Scenario: Providing isolated analog front-end bias for precision current-loop transmitters in hazardous environments. IC Role / Device Role / Timing Role: Flyback controller powering isolated ±5V rails for op-amps and ADCs; synchronized to system clock via SYNC pin. Use Value: Reduces EMI by eliminating switching noise harmonics; frequency foldback protects against sensor short-circuits during field wiring faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3757EMSE#TRPBF | Same architecture but LT3757 (not A) variant; slightly degraded load transient response and higher SENSE threshold tolerance (±15mV vs ±10mV). | Lacks A-grade improved transient performance; suitable only where tighter output regulation during fast load steps is not required. | Select only if cost sensitivity outweighs need for A-grade dynamic performance in battery-fed systems. |
| LM5122MM/NOPB | Wide-VIN current-mode controller with integrated high-side gate driver; no negative-feedback capability; fixed 100kHz–1MHz range without foldback. | Requires external level-shifting for inverting topologies; lacks FBX-based polarity switching and frequency foldback protection. | Prefer when high-side drive simplifies layout and dual-polarity output is unnecessary; verify INTVCC drive capability matches MOSFET QG. |
Compared with LTC3757EMSE#TRPBF and LM5122MM/NOPB, the LT3757AEDD#TRPBF uniquely combines AEC-Q100 qualification, dual-polarity feedback, frequency foldback, and sub-1µA shutdown - making it the only choice for automotive-grade inverting or SEPIC designs demanding robust fault handling and battery longevity.
Availability
LT3757AEDD#TRPBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial telecom power supplies, portable medical imaging systems, and industrial sensor signal conditioning requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT3757AEDD#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 digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3757A series belongs to Analog Devices' high-voltage DC/DC controller product line, designed specifically for rugged, wide-input power conversion in automotive and industrial environments where reliability, thermal robustness, and topology flexibility are critical.
FAQ
What is the maximum operating junction temperature for LT3757AEDD#TRPBF?
The LT3757AEDD#TRPBF is rated for a maximum junction temperature of 125°C and is qualified per AEC-Q100 Grade 1 for continuous operation across –40°C to +125°C. Thermal derating applies above 125°C, and the device includes internal thermal shutdown at approximately 165°C to prevent permanent damage during momentary overloads.
Can LT3757AEDD#TRPBF generate negative output voltages?
Yes, the LT3757AEDD#TRPBF supports negative output generation in inverting converter topology using its dual-reference FBX pin, which regulates to –0.8V when the feedback divider pulls FBX below ground. This eliminates the need for external op-amps or level shifters typically required in conventional inverting controllers.
How does the LT3757AEDD#TRPBF handle overvoltage conditions on the output?
The LT3757AEDD#TRPBF provides dedicated overvoltage protection: when FBX exceeds +1.6V by 8% (≈+1.73V) or falls below –0.8V by 11% (≈–0.89V), internal comparators A11 and A12 trigger a reset pulse that holds the GATE pin low until the fault clears - preventing damage to downstream loads during startup overshoot or short-circuit recovery.
What is the purpose of the SYNC pin on LT3757AEDD#TRPBF?
The SYNC pin on LT3757AEDD#TRPBF allows synchronization of the internal oscillator to an external digital clock signal, reducing EMI by aligning switching edges across multiple converters. For reliable locking, the RT resistor must be selected to set the free-running frequency 20% lower than the external SYNC frequency.
Is LT3757AEDD#TRPBF pin-compatible with the original LT3757EDD#TRPBF?
No - while LT3757AEDD#TRPBF shares identical pinout, package, and functional block diagram with LT3757EDD#TRPBF, it is not a drop-in replacement due to improved load transient response, tighter SENSE threshold tolerance (±10mV vs ±15mV), and enhanced internal compensation. Layout reuse is possible, but revalidation of loop stability and transient behavior is required.
LT3757AEDD#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 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#TRPBF FAQ
1.How can I place an order for LT3757AEDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757AEDD#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 LT3757AEDD#TRPBF reliable?
The price and inventory of LT3757AEDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757AEDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3757AEDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757AEDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757AEDD#TRPBF?
LT3757AEDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757AEDD#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 LT3757AEDD#TRPBF?
For technical support, including LT3757AEDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757AEDD#TRPBF requirements.
6.How does Aetrix verify that LT3757AEDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3757AEDD#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 LT3757AEDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3757AEDD#TRPBF?
All LT3757AEDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757AEDD#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 LT3757AEDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3757AEDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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