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Analog Devices Inc. LT3757IMSE#TRPBF
- Part No.:
- LT3757IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757IMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,071
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Product details
Overview
LT3757IMSE#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 ±1.6V/–0.8V feedback regulation, delivers programmable 50kHz–1MHz switching, features <1µA shutdown current, and integrates a 7.2V LDO for gate drive-ideal for automotive battery-powered systems requiring high-voltage transient resilience.
For engineers reviewing the LT3757IMSE#TRPBF datasheet, LT3757IMSE#TRPBF pinout, LT3757IMSE#TRPBF application, or LT3757IMSE#TRPBF equivalent, key selection criteria include its dual-polarity feedback capability, programmable UVLO hysteresis, frequency synchronization support, soft-start control via SS pin, and AEC-Q100 qualification for under-hood automotive converters.
Technical Context
The LT3757IMSE#TRPBF implements fixed-frequency current-mode control with slope compensation, enabling stable operation across wide VIN and VOUT ranges. Its error amplifier supports dual reference modes (1.6V for positive outputs, –0.8V for negative), and FBX pin directly modulates VC during fault conditions to enable frequency foldback.
It integrates an internal 7.2V LDO regulator with 2.7V UVLO and 17.5V OVLO thresholds, programmable SHDN/UVLO with 1.22V falling threshold and external hysteresis, and a SYNC pin accepting external clocks-with RT resistor programming required to set base frequency 20% below SYNC rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.9V to 40V - enables direct connection to 12V/24V automotive batteries including cold-crank transients. |
| Feedback Reference | +1.6V or –0.8V - allows single-pin configuration of both positive- and negative-output converters without external logic. |
| Switching Frequency | 50kHz to 1MHz - set by RT resistor; supports compact magnetics at high end or higher efficiency at low end. |
| Shutdown Current | <1µA - extends battery life in always-on vehicle modules like telematics or ADAS sensors. |
| SENSE Threshold | 110mV (typ) - sets peak inductor current limit; enables precise overcurrent protection with minimal sense resistor loss. |
| INTVCC Regulator | 7.2V ±0.2V - powers gate driver and internal circuitry; bypassed with ≥4.7µF ceramic capacitor near pin. |
| Operating Temp | –40°C to +125°C - qualified per AEC-Q100 Grade I, suitable for engine compartment and powertrain applications. |
Pinout & Package
LT3757IMSE#TRPBF is housed in 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/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) | Unified feedback input | Accepts voltage divider from output; selects +1.6V or –0.8V reference based on polarity; triggers frequency foldback when near GND. |
| SS (3) | Soft-start control | Charges external capacitor to ramp VC clamp; reset by UVLO/OVLO or thermal lockout. |
| RT (4) | Frequency programming | Resistor-to-GND sets oscillator frequency; open-circuit disables operation. |
| SYNC (5) | External clock input | Accepts digital clock signal; requires RT setting 20% below SYNC frequency for reliable synchronization. |
| SENSE (6) | Current sense input | Kelvin-connected to source-side of MOSFET sense resistor; compares against 110mV threshold for cycle-by-cycle limiting. |
| GATE (7) | N-MOSFET gate driver output | Sources/sinks current between INTVCC and GND; forced low during shutdown, thermal fault, or INTVCC UV/OV. |
| INTVCC (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 (9) | Enable and input UV detection | 1.22V falling threshold with programmable hysteresis; pulls VIN current below 1µA when held ≤0.4V. |
| VIN (10) | Main input supply | 2.9V–40V input; locally bypassed with ≥0.22µF ceramic capacitor; powers internal LDO and bias circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity feedback architecture | Single FBX pin supports both +1.6V (boost/flyback/SEPIC) and –0.8V (inverting) configurations without external switches or logic. |
| Programmable UVLO with hysteresis | SHDN/UVLO pin enables accurate turn-on/off thresholds using external resistors; rising hysteresis derived from 2µA pull-down current. |
| Frequency foldback during overload | Reduces switching frequency when FBX approaches GND during short-circuit or startup, limiting inductor current and thermal stress. |
| Thermally optimized MSOP package | 10-lead MSOP with exposed pad achieves θJA = 40°C/W when soldered to full copper plane-critical for sustained 2A+ output designs. |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation with extended reliability testing-meets automotive power converter requirements. |
Applications
| Automotive LED Headlamp Driver | Industrial Isolated Flyback PSU |
|---|---|
Use Scenario: Driving high-brightness white LEDs from 9V–16V vehicle battery with dimming and fault reporting. IC Role / Device Role / Timing Role: Configured as boost controller; regulates constant current via SENSE pin; uses FBX for output voltage monitoring and overvoltage lockout. Use Value: 110mV current sense threshold enables low-loss shunt design; <1µA shutdown current preserves battery during ignition-off periods. | Use Scenario: Generating isolated 15V/1A auxiliary supply from 24V industrial bus with reinforced insulation. IC Role / Device Role / Timing Role: Operates as flyback controller; INTVCC powered from auxiliary winding via diode; SYNC pin synchronized to system clock for EMI reduction. Use Value: 7.2V INTVCC LDO ensures robust gate drive across input transients; programmable RT resistor allows optimization for transformer size vs. efficiency. |
| Portable Medical Imaging Power | Telecom DC-DC Intermediate Bus |
Use Scenario: Generating ±12V rails from Li-ion battery (3.0V–4.2V) for analog front-end amplifiers in handheld ultrasound devices. IC Role / Device Role / Timing Role: Configured as inverting converter for negative rail; uses –0.8V FBX reference; soft-start prevents inrush into capacitive loads. Use Value: 2.9V minimum VIN enables operation down to nearly depleted battery; dual-reference architecture eliminates need for separate controllers per rail. | Use Scenario: Stepping 48V telecom bus down to 12V intermediate rail for downstream POL converters in base station equipment. IC Role / Device Role / Timing Role: Used in SEPIC topology to maintain regulation during 48V input dips; RT resistor set to 300kHz for optimal core loss vs. size tradeoff. Use Value: 40V absolute max VIN rating withstands telecom surge standards; frequency synchronization aligns switching edges to reduce conducted EMI. |
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 AEC-Q100 qualification. | Better suited for fast-dynamic loads like RF power amplifiers or burst-mode imaging sensors. | Select LT3757AEMSE#TRPBF when tighter output regulation during rapid load steps is required; otherwise LT3757IMSE#TRPBF remains optimal for cost-sensitive automotive modules. |
| LM5122MMX/NOPB | Wider 3V–65V input; integrated high-side gate driver; no negative-output capability; different pinout and compensation scheme. | Designed for high-VIN boost and SEPIC only-not suitable for flyback or inverting configurations. | Choose LM5122MMX/NOPB only for 48V+ industrial or telecom boost applications where negative output is unnecessary and board space permits redesign. |
Compared with LT3757AEMSE#TRPBF, the LT3757IMSE#TRPBF offers identical automotive qualification and topology flexibility but slightly relaxed transient performance-making it ideal for cost-optimized, non-burst-mode automotive power supplies. Versus LM5122MMX/NOPB, it provides broader topology support and lower minimum VIN but lacks integrated high-side drive and higher VIN headroom.
Availability
LT3757IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial flyback PSUs, portable medical imaging power, and telecom intermediate bus converters requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LT3757IMSE#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 highly flexible current-mode controllers for non-isolated and isolated DC/DC conversion, specifically engineered for automotive-grade reliability, wide-input operation, and multi-topology support in space-constrained environments.
FAQ
What is the minimum input voltage supported by the LT3757IMSE#TRPBF?
The LT3757IMSE#TRPBF supports a minimum input voltage of 2.9V, enabling reliable operation from partially discharged 3.3V logic rails or lithium-ion batteries down to ~3.0V. This low VIN threshold is critical for battery-backed automotive modules that must remain functional during cold-crank events where system voltage dips below 6V.
Can the LT3757IMSE#TRPBF generate negative output voltages?
Yes, the LT3757IMSE#TRPBF can generate negative output voltages when configured as an inverting converter. It uses the same FBX pin with a –0.8V internal reference voltage-no additional components or mode-select pins are required. The device automatically selects the appropriate error amplifier path based on FBX voltage polarity.
How does the LT3757IMSE#TRPBF handle overvoltage conditions on the output?
The LT3757IMSE#TRPBF includes dedicated overvoltage protection comparators: one monitors FBX against +1.6V with 8% hysteresis (for positive outputs), another against –0.8V with 11% hysteresis (for negative outputs). When triggered, both force the GATE pin low and hold the power switch off until the fault clears-preventing damage to downstream loads during startup overshoot or short-circuit recovery.
What is the purpose of the exposed pad on the LT3757IMSE#TRPBF MSOP package?
The exposed pad (Pin 11) on the LT3757IMSE#TRPBF serves as the primary thermal conduction path and electrical ground connection. It must be soldered directly to a large PCB copper pour to achieve the specified θJA = 40°C/W. This thermal interface is essential for sustaining continuous 2A+ output currents without exceeding the 125°C junction temperature limit.
Is the LT3757IMSE#TRPBF pin-compatible with the LT3757A variant?
Yes, the LT3757IMSE#TRPBF is fully pin-compatible and footprint-compatible with the LT3757A series (e.g., LT3757AIMSE#TRPBF), sharing identical pin functions, electrical specifications, and package dimensions. The LT3757A offers improved load transient response but requires no layout changes or schematic modifications when substituted.
LT3757IMSE#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
LT3757IMSE#TRPBF FAQ
1.How can I place an order for LT3757IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757IMSE#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 LT3757IMSE#TRPBF reliable?
The price and inventory of LT3757IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3757IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757IMSE#TRPBF?
LT3757IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757IMSE#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 LT3757IMSE#TRPBF?
For technical support, including LT3757IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3757IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3757IMSE#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 LT3757IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3757IMSE#TRPBF?
All LT3757IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757IMSE#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 LT3757IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3757IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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