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Analog Devices Inc. LT3757EDD#TRPBF
- Part No.:
- LT3757EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3757EDD#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,812
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Product details
Overview
LT3757EDD#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. 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 industrial isolated supplies.
For engineers reviewing the LT3757EDD#TRPBF datasheet, LT3757EDD#TRPBF pinout, LT3757EDD#TRPBF application, or LT3757EDD#TRPBF equivalent, key selection criteria include its dual-polarity feedback capability, internal 7.2V LDO gate driver supply, soft-start control via SS pin, frequency synchronization support, and AEC-Q100 qualification for automotive use.
Technical Context
The LT3757EDD#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, allowing single-pin configuration of boost/flyback (positive output) or inverting (negative output) converters.
It integrates an internal 7.2V low-dropout regulator for gate drive, programmable UVLO with hysteresis on SHDN/UVLO, and frequency foldback during overcurrent. The SYNC pin enables external clock synchronization, while RT sets operating frequency with ±10% tolerance over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 40V - supports direct connection to 12V/24V automotive rails and wide industrial input sources. |
| Feedback Reference | ±0.8V / +1.6V - enables single-pin polarity selection for inverting or non-inverting output configurations. |
| Switching Frequency | 50kHz to 1MHz - set by RT resistor; allows trade-off between efficiency (lower f) and magnetics size (higher f). |
| Shutdown Current | <1µA - ensures minimal battery drain in always-on automotive or portable systems during sleep mode. |
| INTVCC Regulator | 7.2V ±0.2V LDO - powers gate driver and internal circuitry; bypass requires ≥4.7µF ceramic capacitor at pin. |
| SENSE Threshold | 110mV (typ) - sets peak switch current limit; enables precise overcurrent protection with Kelvin sensing. |
| Operating Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade E, suitable for under-hood automotive environments. |
Pinout & Package
LT3757EDD#TRPBF is housed in a thermally enhanced 10-lead 3mm × 3mm plastic DFN package (DD) with exposed pad (Pin 11) soldered to PCB ground for optimal thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (1) | Error amplifier compensation node | Accepts RC network to stabilize voltage loop; clamped during soft-start and fault conditions. |
| FBX (2) | Positive/negative feedback input | Dual-reference pin: regulates to +1.6V (boost/flyback/SEPIC) or –0.8V (inverting); enables frequency foldback near GND. |
| SS (3) | Soft-start timing control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO, thermal lockout, or INTVCC faults. |
| RT (4) | Frequency programming input | Resistor-to-GND sets oscillator frequency; open-circuit disables operation; 41.2kΩ yields 300kHz typical. |
| SYNC (5) | External clock synchronization | Accepts digital clock signal; IC locks to SYNC frequency if RT is set 20% lower; tied to GND when unused. |
| SENSE (6) | Current sense input | Kelvin-connected to high-side of sense resistor; compares against 110mV threshold for cycle-by-cycle current limiting. |
| GATE (7) | N-MOSFET gate driver output | Swings between INTVCC and GND; actively pulled low during shutdown, thermal fault, or INTVCC OV/UV. |
| INTVCC (8) | Internal regulated supply | 7.2V LDO output; powers gate driver and logic; must be bypassed with ≥4.7µF ceramic cap; can be externally powered above 7.5V. |
| SHDN/UVLO (9) | Enable and input undervoltage detection | 1.22V falling threshold with programmable hysteresis; pulls VIN IQ below 1µA when ≤0.4V; resets soft-start on undervoltage. |
| VIN (10) | Main power input | 2.9V–40V supply; requires local 0.22µF+ ceramic bypass; powers internal LDO and provides bias for SHDN/UVLO divider. |
| Exposed Pad (11) | Thermal & electrical ground | Must be soldered to PCB ground plane; serves as GND return path and primary thermal conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| Wide-input current-mode architecture | Enables stable regulation across 2.9V–40V input and wide output ranges without loop compensation redesign. |
| Dual-polarity feedback (FBX) | Single-pin selection of +1.6V or –0.8V reference eliminates need for separate topology-specific controllers. |
| Programmable soft-start (SS) | Capacitor-controlled ramp prevents inrush current and output overshoot during startup and recovery. |
| Frequency synchronization (SYNC) | Eliminates beat frequencies in multi-converter systems and reduces EMI through deterministic switching alignment. |
| AEC-Q100 Grade E qualification | Validated for automotive applications including engine control modules, ADAS lighting, and infotainment power rails. |
| Integrated 7.2V LDO with UV/OV protection | Ensures reliable gate drive under varying input conditions; disables GATE output if INTVCC falls below 2.7V or exceeds 17.5V. |
Applications
| Automotive LED Headlamp Driver | Industrial Isolated Flyback Supply |
|---|---|
|
Use Scenario: High-brightness LED array powered from 12V vehicle battery with dynamic dimming and short-circuit protection. IC Role / Device Role / Timing Role: Boost controller regulating constant current to LEDs using SENSE feedback and FBX-based voltage loop. Use Value: 300kHz operation minimizes inductor size; <1µA shutdown current preserves battery life during vehicle off-state. |
Use Scenario: 24V industrial PLC I/O module requiring isolated 5V/3.3V rails with reinforced creepage and transient immunity. IC Role / Device Role / Timing Role: Primary-side flyback controller with optocoupler feedback referenced to FBX pin for precise output regulation. Use Value: Dual-reference FBX enables accurate regulation despite wide input transients; AEC-Q100 qualification ensures reliability in harsh factory environments. |
| Portable Medical Instrument Power | Telecom DC-DC Intermediate Bus Converter |
|
Use Scenario: Battery-powered ultrasound probe requiring low-noise, high-efficiency 15V bias supply from single-cell Li-ion (2.9V–4.2V). IC Role / Device Role / Timing Role: Boost converter with programmable 500kHz switching and soft-start to meet medical-grade inrush limits. Use Value: 2.9V minimum VIN enables full battery utilization; internal LDO eliminates need for external bias rail. |
Use Scenario: 48V telecom system generating 12V intermediate bus for downstream POL converters with strict EMI compliance. IC Role / Device Role / Timing Role: Synchronized flyback controller locked to system clock via SYNC pin to suppress conducted emissions. Use Value: Frequency synchronization reduces spectral peaks; 40V absolute max VIN accommodates 48V transients per GR-1089. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757AEDD#TRPBF | Improved load transient response; tighter FBX regulation (±0.5% vs ±0.8%); same pinout and specs otherwise. | Better suited for fast-dynamic loads like RF power amplifiers or burst-mode digital processors. | Select LT3757AEDD#TRPBF when output voltage stability under rapid load steps is critical. |
| LM5122MMX/NOPB | Wider 3V–65V input; integrated high-side gate driver; no negative-output capability; different pinout and compensation scheme. | Preferred for high-voltage boost applications (e.g., PoE++ PSE) where negative output is unnecessary. | Choose LM5122MMX/NOPB only if >40V input or integrated high-side drive is required; not drop-in compatible. |
Compared with LT3757EDD#TRPBF, the LT3757AEDD#TRPBF offers superior transient performance without layout changes, while the LM5122MMX/NOPB trades dual-polarity flexibility for higher input voltage and integrated drive-but requires full schematic and compensation redesign.
Availability
LT3757EDD#TRPBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial isolated flyback supplies, portable medical instrument power, telecom intermediate bus converters, and battery-backed industrial sensors requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LT3757EDD#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 precision instrumentation, industrial automation, communications, and automotive markets.
The LT3757 product line delivers robust, wide-input DC/DC controllers optimized for demanding power conversion tasks-including boost, flyback, SEPIC, and inverting topologies-in automotive, industrial, and telecom applications.
FAQ
What is the maximum operating junction temperature for LT3757EDD#TRPBF?
The LT3757EDD#TRPBF has a maximum junction temperature (TJMAX) of 125°C, with guaranteed operation from –40°C to +125°C ambient. Its 3mm × 3mm DFN package features an exposed pad that must be soldered to PCB ground to achieve θJA = 43°C/W and maintain safe thermal margins under full load.
Can LT3757EDD#TRPBF generate a negative output voltage?
Yes, the LT3757EDD#TRPBF supports negative output generation using inverting topology. When configured this way, the FBX pin regulates to –0.8V (not +1.6V), enabling direct feedback from the negative rail. This dual-reference capability is intrinsic to the LT3757EDD#TRPBF and requires no external components beyond the standard inverting converter layout.
How is the switching frequency set on LT3757EDD#TRPBF?
The switching frequency of LT3757EDD#TRPBF is set by connecting a resistor (RT) from Pin 4 (RT) to ground. For example, a 41.2kΩ resistor yields ~300kHz. The RT value must be selected from Table 1 in the datasheet; leaving RT open disables operation. Frequency accuracy is ±10% over temperature and line.
Does LT3757EDD#TRPBF require an external bootstrap capacitor?
No, the LT3757EDD#TRPBF does not use a bootstrap capacitor. It drives the gate of an external low-side N-channel MOSFET directly from its internal 7.2V LDO-regulated INTVCC supply. A minimum 4.7µF ceramic capacitor must be placed between INTVCC and GND to support gate drive transients.
Is LT3757EDD#TRPBF pin-compatible with LT3757AEDD#TRPBF?
Yes, the LT3757EDD#TRPBF and LT3757AEDD#TRPBF share identical pinout, package, and electrical specifications except for improved load transient response and tighter FBX regulation in the 'A' version. They are functionally interchangeable in existing designs, though the 'A' variant may improve dynamic performance without hardware change.
LT3757EDD#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)
LT3757EDD#TRPBF FAQ
1.How can I place an order for LT3757EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757EDD#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 LT3757EDD#TRPBF reliable?
The price and inventory of LT3757EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3757EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757EDD#TRPBF?
LT3757EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757EDD#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 LT3757EDD#TRPBF?
For technical support, including LT3757EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757EDD#TRPBF requirements.
6.How does Aetrix verify that LT3757EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3757EDD#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 LT3757EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3757EDD#TRPBF?
All LT3757EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757EDD#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 LT3757EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3757EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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