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Analog Devices Inc. LT3757AEMSE#TRPBF
- Part No.:
- LT3757AEMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757AEMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,058
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Product details
Overview
LT3757AEMSE#TRPBF from Analog Devices is a wide-input current-mode DC/DC controller for boost, flyback, SEPIC, and inverting topologies. It drives an external N-channel MOSFET, supports ±0.8V/1.6V feedback thresholds, operates from 2.9V to 40V input, delivers programmable 50kHz–1MHz switching, and features <1µA shutdown current - enabling high-efficiency battery-powered automotive and industrial power supplies.
For engineers reviewing the LT3757AEMSE#TRPBF datasheet, LT3757AEMSE#TRPBF pinout, LT3757AEMSE#TRPBF application, or LT3757AEMSE#TRPBF equivalent, key selection criteria include its dual-polarity feedback capability, internal 7.2V LDO, soft-start programmability, frequency synchronization support, and AEC-Q100 qualification for automotive use.
Technical Context
The LT3757AEMSE#TRPBF implements fixed-frequency current-mode control with slope compensation, using the SENSE pin for peak-current sensing and VC for error amplifier output clamping. Its dual-reference feedback architecture (±0.8V / +1.6V) enables seamless positive- or negative-output configuration without external logic.
It integrates a 7.2V low-dropout regulator for gate drive, supports programmable UVLO hysteresis via SHDN/UVLO, and includes frequency foldback during overcurrent and FBX-based overvoltage lockout (±8% / ±11%) - all within a thermally enhanced 10-pin MSOP package rated for –40°C to 125°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 40V - supports wide-range inputs including 12V automotive, 24V industrial, and multi-cell battery systems. |
| Switching Frequency | 50kHz to 1MHz - set by RT resistor; enables trade-off between efficiency (lower f) and magnetics size (higher f). |
| Feedback Reference | +1.6V or –0.8V - single FBX pin supports both positive- and negative-output configurations without hardware change. |
| Shutdown Current | <1µA - minimizes battery drain in always-on or low-power standby applications. |
| INTVCC Regulator | 7.2V ±0.2V LDO - powers gate driver and internal circuitry; bypassed with ≥4.7µF ceramic capacitor. |
| SENSE Threshold | 110mV (typical) - sets peak switch current limit; enables precise overcurrent protection with Kelvin-sense layout. |
| Operating Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade E, suitable for under-hood automotive environments. |
Pinout & Package
LT3757AEMSE#TRPBF is housed in a thermally enhanced 10-lead plastic MSOP package (3mm × 3mm) with exposed pad (Pin 11) soldered to PCB ground for optimal thermal performance (θJA = 40°C/W).
| 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 | Accepts voltage divider from output; selects +1.6V or –0.8V reference automatically based on polarity. |
| SS (Pin 3) | Soft-start timing input | Charged by internal 10µA current source; controls ramp-up of VC to limit inrush current. |
| RT (Pin 4) | Frequency programming input | Resistor-to-GND sets oscillator frequency; open-circuit disables operation. |
| SYNC (Pin 5) | External clock synchronization input | Accepts digital clock signal; requires RT setting 20% below SYNC frequency for reliable locking. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to MOSFET source-side sense resistor; triggers immediate shutdown above 110mV. |
| GATE (Pin 7) | N-channel MOSFET gate driver output | Sources/sinks current to drive external FET; pulled low during shutdown, thermal fault, or INTVCC UV/OV. |
| INTVCC (Pin 8) | Internal regulated supply output | 7.2V LDO output; must be bypassed with ≥4.7µF ceramic cap; can be externally powered to reduce dissipation. |
| SHDN/UVLO (Pin 9) | Enable and input undervoltage detection | 1.22V falling threshold with programmable hysteresis; resets soft-start on undervoltage event. |
| VIN (Pin 10) | Main input supply | 2.9V–40V input; requires local 0.22µF+ ceramic bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity feedback architecture | Single FBX pin supports both +1.6V (boost/flyback/SEPIC) and –0.8V (inverting) output regulation without external reconfiguration. |
| Programmable frequency with synchronization | 50kHz–1MHz range set by one RT resistor; SYNC pin allows deterministic phase alignment with system clocks. |
| Integrated 7.2V LDO with protection | Powers gate driver and internal logic; includes UVLO (2.7V), OVLO (17.5V), and current limiting to prevent thermal runaway. |
| Automotive-grade reliability | AEC-Q100 qualified (Grade E); specified from –40°C to +125°C junction temperature with production test coverage. |
| Robust fault management | Includes frequency foldback during overload, FBX-based overvoltage lockout (±8%/±11%), and thermal shutdown with automatic recovery. |
Applications
| Automotive LED Headlamp Driver | Industrial Isolated Flyback PSU |
|---|---|
Use Scenario: Driving high-brightness LEDs in vehicle headlamps requiring >30V output from 12V battery with tight current regulation. IC Role / Device Role / Timing Role: Boost controller regulating LED current via SENSE feedback; uses FBX to maintain constant output voltage while modulating GATE at 300kHz. Use Value: Enables compact, efficient design with <1µA shutdown current preserving battery life during ignition-off periods. | Use Scenario: Generating isolated 15V/1A auxiliary supply for PLC I/O modules from unregulated 24V industrial rail. IC Role / Device Role / Timing Role: Flyback controller with optocoupler feedback to FBX; INTVCC powered from secondary winding via diode clamp. Use Value: Leverages dual-reference FBX to simplify feedback network and improves transient response vs. standard TL431-based designs. |
| Portable Medical Instrument Power | Telecom DC-DC Intermediate Bus |
Use Scenario: Providing ±12V rails from single-cell Li-ion (2.9V–4.2V) in handheld diagnostic devices. IC Role / Device Role / Timing Role: Inverting controller generating negative output; uses SS pin for controlled startup to avoid sensor bias disruption. Use Value: Achieves stable dual-rail generation with minimal external components and no need for separate negative regulators. | Use Scenario: Stepping up 48V telecom bus to 54V intermediate rail for downstream point-of-load converters. IC Role / Device Role / Timing Role: High-voltage boost controller operating at 200kHz; RT resistor selected for efficiency optimization at full load. Use Value: Supports high-reliability telecom requirements with AEC-Q100-grade silicon and robust INTVCC overvoltage protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757EMSE#TRPBF | Same pinout and functionality but lacks LT3757A's improved load transient response and tighter FBX regulation tolerance (±1.5mV vs ±3mV). | Acceptable for non-critical industrial boost converters where fast load steps are infrequent. | Select LT3757AEMSE#TRPBF when dynamic performance or automotive qualification is required. |
| UCC28C43DR | Fixed 1.5A gate driver, no integrated LDO, 12V max VDD, no dual-polarity feedback - requires external bias and feedback scaling. | Suitable for cost-sensitive, lower-voltage (<20V) boost applications without negative output or automotive requirements. | Choose UCC28C43DR only if VIN ≤ 20V, INTVCC is externally supplied, and dual-polarity operation is unnecessary. |
Compared with LT3757EMSE#TRPBF, the LT3757AEMSE#TRPBF offers superior transient response and AEC-Q100 qualification; versus UCC28C43DR, it provides integrated bias, wider input range, and native negative-output capability - making it uniquely suited for automotive and multi-topology designs.
Availability
LT3757AEMSE#TRPBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial flyback PSUs, portable medical instrument power, and telecom intermediate bus converters requiring stable component supply across extended temperature ranges.
Supply support for LT3757AEMSE#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, and automotive safety markets.
The LT3757A product line delivers high-voltage, multi-topology DC/DC controllers optimized for rugged, high-reliability power conversion in automotive and industrial environments - emphasizing wide input range, fault resilience, and AEC-Q100 compliance.
FAQ
What is the primary function of the LT3757AEMSE#TRPBF?
The LT3757AEMSE#TRPBF is a current-mode DC/DC controller designed to drive external N-channel MOSFETs in boost, flyback, SEPIC, and inverting converter topologies. It regulates output voltage or current using a single FBX pin that supports both +1.6V and –0.8V reference thresholds, enabling flexible polarity configuration without hardware changes. Its core function is precise, stable power conversion across wide input ranges (2.9V–40V) with programmable frequency and robust fault protection.
How does the LT3757AEMSE#TRPBF differ from the standard LT3757?
The LT3757AEMSE#TRPBF features improved load transient performance and tighter feedback voltage regulation tolerance (±1.5mV vs ±3mV for LT3757) due to enhanced error amplifier design. It also exhibits better SENSE threshold consistency across temperature and improved frequency foldback behavior during short-circuit events. These refinements make the LT3757AEMSE#TRPBF preferred for automotive and high-dynamic-response applications where stability under rapid load changes is critical.
Can the LT3757AEMSE#TRPBF generate negative output voltages?
Yes, the LT3757AEMSE#TRPBF natively supports negative output generation in inverting converter topology. When configured for inversion, the FBX pin regulates to –0.8V (with ±11% overvoltage lockout), and the internal error amplifier A2 performs non-inverting amplification from FBX to VC. This eliminates the need for external level-shifting circuitry or dual-supply op-amps - the same LT3757AEMSE#TRPBF device and pinout handle both positive and negative outputs via feedback network configuration alone.
What is the role of the INTVCC pin on the LT3757AEMSE#TRPBF?
The INTVCC pin on the LT3757AEMSE#TRPBF delivers a regulated 7.2V output from the internal LDO, powering the gate driver and internal logic. It must be bypassed with ≥4.7µF ceramic capacitance adjacent to the pin. For high-efficiency operation, INTVCC can be externally powered (e.g., from VIN or VOUT) to disable the internal LDO - reducing on-chip power dissipation, especially at high switching frequencies or large MOSFET gate charges. The LT3757AEMSE#TRPBF monitors INTVCC for UVLO (2.7V) and OVLO (17.5V) to protect gate drive integrity.
Is the LT3757AEMSE#TRPBF qualified for automotive applications?
Yes, the LT3757AEMSE#TRPBF is AEC-Q100 qualified for automotive applications (Grade E, –40°C to +125°C). It undergoes stress testing including HTOL, TC, and ESD per AEC-Q100 Rev H, and is manufactured with controlled process flow to meet automotive reliability standards. The part marking "LTGGM" and packaging in thermally enhanced MSOP with exposed pad further support under-hood deployment. Automotive-grade versions are explicitly designated in the ordering matrix and require the #W suffix for full qualification - though LT3757AEMSE#TRPBF itself meets the specification for non-safety-critical automotive power systems.
LT3757AEMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT3757AEMSE#TRPBF FAQ
1.How can I place an order for LT3757AEMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757AEMSE#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 LT3757AEMSE#TRPBF reliable?
The price and inventory of LT3757AEMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757AEMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3757AEMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757AEMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757AEMSE#TRPBF?
LT3757AEMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757AEMSE#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 LT3757AEMSE#TRPBF?
For technical support, including LT3757AEMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757AEMSE#TRPBF requirements.
6.How does Aetrix verify that LT3757AEMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3757AEMSE#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 LT3757AEMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3757AEMSE#TRPBF?
All LT3757AEMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757AEMSE#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 LT3757AEMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3757AEMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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