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Analog Devices Inc. LT3757IMSE#PBF
- Part No.:
- LT3757IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757IMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,548
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Product details
Overview
LT3757IMSE#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, features internal 7.2V LDO, <1µA shutdown current, and AEC-Q100 qualification for automotive power conversion.
For engineers reviewing the LT3757IMSE#PBF datasheet, LT3757IMSE#PBF pinout, LT3757IMSE#PBF application, or LT3757IMSE#PBF equivalent, key selection criteria include its dual-polarity feedback capability, soft-start and frequency foldback for fault protection, thermal-enhanced MSOP-10 package, and compatibility with external N-channel MOSFETs in high-reliability industrial and automotive systems.
Technical Context
The LT3757IMSE#PBF implements fixed-frequency current-mode control with slope compensation, enabling stable regulation across wide VIN and VOUT ranges. Its error amplifier supports both positive (1.6V) and negative (–0.8V) FBX reference modes, and the VC pin provides direct access to the compensated control loop.
Frequency programming uses an external RT resistor (41.2kΩ for 300kHz), while SYNC pin enables external clock synchronization with 20% slower RT-set base frequency. The IC integrates undervoltage lockout on SHDN/UVLO (1.22V nominal falling threshold) and INTVCC (2.7V UV, 17.5V OV), plus overvoltage protection on FBX (±8–11% thresholds).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 40V - supports wide battery and industrial supply rails without pre-regulation |
| Switching Frequency | 50kHz to 1MHz - set by RT resistor; enables trade-off between efficiency and magnetics size |
| FBX Regulation Voltage | +1.6V or –0.8V - single-pin polarity selection for positive/negative output configurations |
| SENSE Threshold | 110mV (typ) - sets peak switch current limit; enables precise overcurrent protection |
| Shutdown Current | <1µA - minimizes battery drain in always-on or low-power standby systems |
| INTVCC Regulator | 7.2V ±0.2V - powers gate driver and internal circuitry; bypassed with ≥4.7µF ceramic capacitor |
| Package | 10-Lead MSOP (3mm × 3mm) with exposed pad - θJA = 40°C/W; requires soldered GND pad for thermal performance |
Pinout & Package
LT3757IMSE#PBF is housed in a thermally enhanced 10-lead plastic MSOP package (3mm × 3mm) with exposed pad (Pin 11) that must be soldered to PCB ground for thermal conduction and current-sense return path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; directly modulated during soft-start |
| FBX (Pin 2) | Positive/negative feedback input | Sets output regulation point at +1.6V or –0.8V; triggers frequency foldback near GND during faults |
| SS (Pin 3) | Soft-start timing control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UV/OV/thermal events |
| RT (Pin 4) | Frequency programming input | Resistor-to-GND sets oscillator frequency; open-circuit prohibited |
| SYNC (Pin 5) | External clock synchronization input | Accepts digital clock; overrides RT-set frequency when active; tie to GND if unused |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to MOSFET source-side sense resistor; ±0.3V absolute max rating |
| GATE (Pin 7) | N-channel MOSFET gate 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 logic; bypass with ≥4.7µF ceramic cap; can be externally powered |
| SHDN/UVLO (Pin 9) | Enable/disable and input UVLO input | 1.22V falling threshold; programmable hysteresis via external divider; pulls VIN IQ below 1µA when ≤0.4V |
| VIN (Pin 10) | Main input supply | Bypass with ≥0.22µF ceramic cap; powers internal LDO and supplies gate drive current |
Key Features
| Feature | Design Value |
|---|---|
| Single-pin polarity selection | FBX pin accepts either positive or negative feedback networks-eliminates need for separate IC variants per output polarity |
| Programmable frequency with sync | RT resistor sets 50kHz–1MHz range; SYNC pin allows deterministic phase alignment in multi-rail systems |
| Integrated fault protections | Frequency foldback during overload, FBX overvoltage lockout (±8–11%), and thermal shutdown prevent component stress |
| Low-quiescent-current shutdown | <1µA VIN current in shutdown-critical for battery-powered systems requiring long shelf life |
| AEC-Q100 qualified | Rated for –40°C to +125°C junction temperature-validated for automotive under-hood and infotainment power supplies |
Applications
| Automotive LED Driver | Industrial Isolated Flyback Supply |
|---|---|
Use Scenario: Driving high-brightness LED strings from 12V vehicle battery with EMI-constrained layout. IC Role / Device Role / Timing Role: Flyback controller regulating constant current via secondary-side optocoupler feedback; FBX configured for negative reference. Use Value: 2.9V minimum start-up enables operation during cranking; <1µA shutdown preserves battery; AEC-Q100 ensures reliability across temperature cycles. | 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 auxiliary winding for INTVCC; synchronous rectification enabled via GATE timing. Use Value: 40V absolute max VIN withstands industrial transients; 300kHz operation reduces transformer size; MSOP package fits compact PCB layouts. |
| Portable Medical Instrument Boost | Telecom SEPIC Bias Supply |
Use Scenario: Generating 24V from single-cell Li-ion (2.9–4.2V) for portable ultrasound front-end amplifiers. IC Role / Device Role / Timing Role: Boost controller with soft-start limiting inrush into large output capacitors; RT set to 500kHz for small inductor. Use Value: 2.9V minimum VIN enables full battery utilization; frequency foldback prevents inductor saturation during short-circuit test. | Use Scenario: Providing stable 5V bias for telecom line-card PHYs from fluctuating –48V telecom supply. IC Role / Device Role / Timing Role: SEPIC controller accepting negative input; FBX referenced to –0.8V; INTVCC powered from output via diode. Use Value: Polarity-insensitive topology handles reverse-polarity insertion; 125°C rating supports high-ambient telecom cabinets. |
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#PBF | Same architecture and pinout; rated for –40°C to +125°C (E-grade), not AEC-Q100 qualified | Non-automotive industrial or commercial designs where extended temperature validation is not required | Select LT3757EMSE#PBF for cost-sensitive non-automotive applications needing identical functionality without automotive qualification |
| LT3757AIMSE#PBF | Same MSOP-10 package and pinout; AEC-Q100 qualified with improved load transient response (LT3757A variant) | Automotive systems requiring faster dynamic response to load steps, e.g., ADAS camera modules | Select LT3757AIMSE#PBF when tighter output regulation during rapid load changes is critical, and AEC-Q100 compliance is mandatory |
Compared with LT3757EMSE#PBF, the LT3757IMSE#PBF adds automotive qualification but shares identical electrical specs and thermal performance; versus LT3757AIMSE#PBF, it trades transient performance for lower cost while retaining full AEC-Q100 compliance and same operating envelope.
Availability
LT3757IMSE#PBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial isolated flyback supplies, and portable medical instrument boost converters requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LT3757IMSE#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 power management semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LT3757 product line delivers versatile, high-voltage current-mode controllers for non-isolated and isolated DC/DC conversion-designed specifically for robustness in harsh environments including automotive under-hood and industrial power systems.
FAQ
What is the maximum input voltage rating for LT3757IMSE#PBF?
The LT3757IMSE#PBF has an absolute maximum input voltage rating of 40V on the VIN pin. Operation beyond this voltage risks permanent damage. The device is designed for reliable operation across its full specified input range of 2.9V to 40V, making it suitable for 24V industrial buses and 12V/48V automotive systems with transient tolerance.
How does LT3757IMSE#PBF support both positive and negative output voltages?
The LT3757IMSE#PBF supports both polarities through its dual-reference FBX pin, which regulates to +1.6V for boost/flyback/SEPIC configurations or –0.8V for inverting topologies. The internal error amplifiers (A1/A2) automatically select mode based on external resistor divider connection-no external logic or configuration pins are required.
Can LT3757IMSE#PBF synchronize to an external clock, and what are the requirements?
Yes, LT3757IMSE#PBF can synchronize to an external clock via the SYNC pin. The external clock must have ≥200ns pulse width and logic levels compatible with SYNC input thresholds (0.4V low, 1.5V high). To avoid instability, the RT resistor must be selected to set the free-running frequency 20% slower than the SYNC frequency.
What thermal considerations apply to LT3757IMSE#PBF in MSOP-10 package?
The LT3757IMSE#PBF in MSOP-10 has θJA = 40°C/W when the exposed pad is properly soldered to a solid PCB ground plane. For ambient temperatures up to 70°C and max junction temperature of 125°C, average gate drive current must be limited to maintain safe operation-use the INTVCC Minimum Output Current vs VIN graph to size MOSFET QG and frequency accordingly.
Is LT3757IMSE#PBF pin-compatible with LT3757AIMSE#PBF?
Yes, LT3757IMSE#PBF is pin-compatible with LT3757AIMSE#PBF-both use identical 10-lead MSOP packages, share identical pin functions, and require the same external components. The difference lies in grade: LT3757IMSE#PBF is I-grade (–40°C to +125°C, AEC-Q100), while LT3757AIMSE#PBF is AI-grade (same temp range, AEC-Q100, plus improved load transient response).
LT3757IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT3757IMSE#PBF FAQ
1.How can I place an order for LT3757IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757IMSE#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 LT3757IMSE#PBF reliable?
The price and inventory of LT3757IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3757IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757IMSE#PBF?
LT3757IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757IMSE#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 LT3757IMSE#PBF?
For technical support, including LT3757IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757IMSE#PBF requirements.
6.How does Aetrix verify that LT3757IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3757IMSE#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 LT3757IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3757IMSE#PBF?
All LT3757IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757IMSE#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 LT3757IMSE#PBF part is unused and in its original packaging.
Return procedure for LT3757IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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