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Analog Devices Inc. LT3757EMSE#TRPBF
- Part No.:
- LT3757EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757EMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,634
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Product details
Overview
LT3757EMSE#TRPBF from Analog Devices is a wide-input current-mode DC/DC controller for boost, flyback, SEPIC, and inverting topologies, supporting 2.9V–40V input, programmable 50kHz–1MHz switching frequency, and ±1µA shutdown current. It drives external N-channel MOSFETs with an internal 7.2V LDO and operates across –40°C to 125°C for automotive-grade power conversion.
For engineers reviewing the LT3757EMSE#TRPBF datasheet, LT3757EMSE#TRPBF pinout, LT3757EMSE#TRPBF application, or LT3757EMSE#TRPBF equivalent, key selection criteria include its single-feedback-pin polarity-agnostic output programming, soft-start and frequency foldback for short-circuit protection, and AEC-Q100 qualification for automotive systems requiring stable high-voltage DC/DC control.
Technical Context
The LT3757EMSE#TRPBF implements fixed-frequency current-mode control with slope compensation, using the SENSE pin for peak-current sensing and VC for error amplifier compensation. Its dual-regulation architecture supports both positive (1.6V FBX reference) and negative (–0.8V FBX reference) output configurations without hardware change.
It integrates a 7.2V low-dropout regulator for gate drive, with UVLO (2.7V) and OVLO (17.5V) protection on INTVCC, and features programmable SHDN/UVLO thresholds with hysteresis via external resistors. The SYNC pin enables external clock synchronization when RT is set 20% below target frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 40V - supports wide-range battery and industrial supplies, including 12V/24V automotive rails. |
| Switching Frequency | 50kHz to 1MHz - set by RT resistor; enables trade-off between efficiency (lower f) and magnetics size (higher f). |
| FBX Reference Voltage | +1.6V or –0.8V - single-pin programmable polarity for boost/flyback (positive) or inverting (negative) outputs. |
| SENSE Threshold | 110mV (typ) - sets peak switch current limit; determines maximum inductor current before cycle-by-cycle shutdown. |
| Shutdown Current | <1µA - enables ultra-low-power battery hold-up in always-on systems. |
| INTVCC Regulator | 7.2V LDO - powers gate driver and internal circuitry; bypass requires ≥4.7µF ceramic capacitor at pin. |
| Operating Temp Range | –40°C to 125°C - qualified per AEC-Q100 Grade E, suitable for under-hood automotive environments. |
Pinout & Package
LT3757EMSE#TRPBF uses a thermally enhanced 10-lead MSOP package (3mm × 3mm) with exposed pad (Pin 11) soldered to PCB ground for thermal management (θJA = 40°C/W). Pin numbering follows standard top-view MSOP orientation.
| 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) | Feedback input | Accepts voltage divider from output; selects +1.6V or –0.8V reference based on polarity; triggers frequency foldback near GND. |
| SS (Pin 3) | Soft-start control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UV/OV/thermal events. |
| RT (Pin 4) | Frequency programming | Resistor to GND sets oscillator frequency; open-circuit disables operation. |
| SYNC (Pin 5) | External clock input | Accepts digital clock signal; overrides RT setting if active; tie to GND for free-running mode. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to MOSFET source-side sense resistor; compares against 110mV threshold for cycle-by-cycle limiting. |
| GATE (Pin 7) | MOSFET gate driver output | Sources/sinks to drive N-channel gate; forced low during shutdown, thermal lockout, or INTVCC faults. |
| INTVCC (Pin 8) | Internal LDO output | 7.2V regulated supply for gate driver and logic; must be bypassed with ≥4.7µF ceramic cap; can be externally powered above 7.5V. |
| SHDN/UVLO (Pin 9) | Enable and input monitoring | 1.22V falling threshold with programmable hysteresis; resets soft-start on undervoltage; <0.4V forces shutdown <1µA IQ. |
| VIN (Pin 10) | Main input supply | 2.9V–40V input; requires local 0.22µF+ ceramic bypass; powers internal LDO unless INTVCC is externally supplied. |
Key Features
| Feature | Design Value |
|---|---|
| Polarity-agnostic feedback | Single FBX pin supports both +1.6V and –0.8V regulation references - eliminates need for separate IC variants for boost vs inverting designs. |
| Programmable UVLO with hysteresis | SHDN/UVLO pin allows precise turn-on/off thresholds via external resistor divider - ensures reliable startup and brownout recovery in automotive systems. |
| Frequency foldback during overload | Reduces switching frequency when FBX approaches GND - limits peak inductor current during start-up or output short-circuit without external circuitry. |
| Thermally optimized MSOP package | Exposed pad and 40°C/W θJA enable high-power density designs - supports continuous operation up to 125°C junction temperature. |
| AEC-Q100 Grade E qualification | Validated for automotive applications including engine control, lighting, and infotainment power supplies - meets stress testing and reliability requirements for vehicle deployment. |
Applications
| Automotive LED Driver | Industrial Boost Converter |
|---|---|
Use Scenario: Driving high-brightness LEDs from 12V vehicle battery with overvoltage and thermal protection. IC Role / Device Role / Timing Role: Current-mode boost controller regulating constant current through LED string using SENSE feedback and FBX voltage reference. Use Value: Enables single-chip solution for 24V–48V LED strings with <1µA shutdown current for parking-light retention and AEC-Q100 compliance for under-hood mounting. | Use Scenario: Generating 48V bias rail from 24V industrial PLC supply with wide input tolerance. IC Role / Device Role / Timing Role: Fixed-frequency boost controller managing MOSFET gate drive via INTVCC LDO and peak-current limiting via SENSE pin. Use Value: Delivers stable 48V/2A output with 50kHz–1MHz programmability to optimize efficiency vs. inductor size, and 2.9V minimum VIN supports brownout resilience. |
| Flyback Power Supply for Telecom | Inverting DC/DC for Sensor Bias |
Use Scenario: Isolated 5V/3A auxiliary supply in telecom base station equipment with input surge immunity. IC Role / Device Role / Timing Role: Flyback controller using transformer-coupled feedback and synchronous rectification timing derived from GATE signal. Use Value: Supports 40V max input and integrated frequency synchronization (SYNC pin) to reduce EMI in dense board layouts with multiple converters. | Use Scenario: Generating –5V bias for precision analog sensors in data acquisition modules. IC Role / Device Role / Timing Role: Inverting converter controller using negative FBX reference (–0.8V) and external N-MOSFET switch. Use Value: Eliminates need for dedicated inverting IC; achieves tight regulation (±1.5% FBX ref) and low noise via current-mode control and soft-start (SS pin). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757AEMSE#TRPBF | Improved load transient response; identical pinout, specs, and package; same temp range (–40°C to 125°C). | Better dynamic performance in fast-load-change scenarios (e.g., burst-mode LED drivers); otherwise drop-in compatible. | Select LT3757AEMSE#TRPBF when tighter output regulation under transient loads is required; no layout or BOM changes needed. |
| LM5122MMX/NOPB | Wider 3V–65V input; integrated high-side gate driver; no internal LDO; requires external VDD bias. | Supports higher input voltages and synchronous rectification; lacks negative-output capability and AEC-Q100 qualification. | Choose LM5122MMX/NOPB for non-automotive 65V-input boost/flyback where integrated high-side drive reduces component count. |
Compared with LT3757EMSE#TRPBF, LT3757AEMSE#TRPBF offers superior transient response without sacrificing compatibility, while LM5122MMX/NOPB trades polarity flexibility and automotive qualification for higher input voltage and integrated high-side drive - making each optimal for distinct system-level priorities.
Availability
LT3757EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial boost converters, telecom flyback supplies, and sensor bias inverters requiring stable component supply and AEC-Q100-compliant performance.
Supply support for LT3757EMSE#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 LT3757 product line delivers high-voltage current-mode controllers for isolated and non-isolated DC/DC conversion, designed specifically for demanding automotive and industrial power systems requiring wide input range and robust fault protection.
FAQ
What topology configurations does the LT3757EMSE#TRPBF support?
The LT3757EMSE#TRPBF supports boost, flyback, SEPIC, and inverting converter topologies. Its single FBX pin accepts either positive or negative feedback references (+1.6V or –0.8V), enabling polarity-agnostic output regulation without changing external components. This flexibility allows one LT3757EMSE#TRPBF design to serve multiple power architectures across automotive and industrial applications.
How is the switching frequency programmed on the LT3757EMSE#TRPBF?
The LT3757EMSE#TRPBF switching frequency is set using an external resistor (RT) connected from Pin 4 (RT) to GND. Values range from 10.5kΩ (1MHz) to 442kΩ (50kHz), per the datasheet's RT table. The RT pin must never be left floating; incorrect or missing RT resistors cause undefined operation. For synchronized operation, the RT resistor should be selected for 20% lower frequency than the external SYNC clock.
Does the LT3757EMSE#TRPBF require an external gate driver?
No, the LT3757EMSE#TRPBF integrates a robust gate driver on Pin 7 (GATE) capable of directly driving N-channel MOSFETs. It sources/sinks current from the internal 7.2V INTVCC LDO (bypassed with ≥4.7µF ceramic capacitor). For high-QG MOSFETs at high frequencies, users must verify INTVCC stability using the QG vs VIN plot in the datasheet to avoid dropout-induced faults.
What is the purpose of the exposed pad on the LT3757EMSE#TRPBF MSOP package?
The exposed pad (Pin 11) on the LT3757EMSE#TRPBF MSOP package is electrically and thermally connected to GND. It must be soldered to a solid PCB ground plane to achieve the specified θJA = 40°C/W thermal resistance. This thermal path is essential for maintaining safe junction temperature under full-load operation at 125°C ambient, especially in automotive under-hood applications.
Can the LT3757EMSE#TRPBF operate from a 3.3V input supply?
Yes, the LT3757EMSE#TRPBF supports input voltages as low as 2.9V, making it suitable for 3.3V logic-supply-derived bias rails. However, at low VIN, the internal 7.2V INTVCC LDO dropout becomes critical: ensure VIN > 7.5V if powering the gate driver from INTVCC, or alternatively connect INTVCC to an external ≥7.5V supply to maintain gate drive strength for low-RDS(on) MOSFETs.
LT3757EMSE#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
LT3757EMSE#TRPBF FAQ
1.How can I place an order for LT3757EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757EMSE#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 LT3757EMSE#TRPBF reliable?
The price and inventory of LT3757EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3757EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757EMSE#TRPBF?
LT3757EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757EMSE#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 LT3757EMSE#TRPBF?
For technical support, including LT3757EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3757EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3757EMSE#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 LT3757EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3757EMSE#TRPBF?
All LT3757EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757EMSE#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 LT3757EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3757EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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