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Analog Devices Inc. LT3757AIMSE#PBF
- Part No.:
- LT3757AIMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757AIMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,651
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Product details
Overview
LT3757AIMSE#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, integrates a 7.2V LDO for gate drive, and features <1µA shutdown current-enabling high-efficiency battery-powered LED drivers and automotive power supplies.
For engineers reviewing the LT3757AIMSE#PBF datasheet, LT3757AIMSE#PBF pinout, LT3757AIMSE#PBF application, or LT3757AIMSE#PBF equivalent, key selection criteria include its dual-polarity feedback capability (±0.8V/1.6V FBX thresholds), 10-pin MSOP thermal performance (θJA = 40°C/W), soft-start and frequency foldback for short-circuit protection, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LT3757AIMSE#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) feedback references, and the VC pin provides direct access to the compensated control loop for external loop shaping.
Internal protection includes INTVCC UVLO (2.7V) and OVLO (17.5V), FBX overvoltage lockout (±8–11%), thermal shutdown at 165°C, and SENSE-based cycle-by-cycle current limiting at 110mV typical. The SYNC pin allows external clock synchronization with 200ns minimum pulse width and 20% slower RT-programmed base frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 40V - supports wide-range industrial and automotive battery inputs including cold-crank 6V and 24V 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 external logic. |
| Shutdown Current | <1µA - critical for long-life battery applications such as portable medical devices and IoT sensors. |
| INTVCC Regulator | 7.2V ±0.2V LDO - powers internal circuitry and gate driver; bypassed with ≥4.7µF ceramic capacitor near pin. |
| Current Sense Threshold | 110mV typical - sets peak switch current limit; enables precise MOSFET overcurrent protection with Kelvin sense routing. |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade I, suitable for under-hood automotive environments. |
Pinout & Package
LT3757AIMSE#PBF is housed in a thermally enhanced 10-lead MSOP package (3mm × 3mm) with exposed pad (Pin 11) soldered to PCB ground for optimal thermal dissipation (θJA = 40°C/W). The package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (1) | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; directly modulates PWM comparator threshold. |
| FBX (2) | Positive/negative feedback input | Sets output regulation point: pulled to 1.6V for positive outputs, –0.8V for negative outputs; also triggers frequency foldback during faults. |
| SS (3) | Soft-start timing control | Charged by internal 10µA current source; external capacitor sets startup ramp time and resets on UV/OV/thermal fault. |
| RT (4) | Frequency programming input | Resistor-to-GND sets oscillator frequency; open-circuit disables operation; requires defined value per Table 1. |
| SYNC (5) | External clock synchronization input | Accepts digital clock signal; forces switching at SYNC frequency when active; tied to GND for free-running mode. |
| SENSE (6) | Current sense amplifier input | Kelvin-connected to MOSFET source-side sense resistor; compares against 110mV threshold for cycle-by-cycle current limiting. |
| GATE (7) | N-channel MOSFET gate driver output | Drives external FET gate between INTVCC and GND; clamped low during shutdown, thermal fault, or INTVCC UV/OV. |
| INTVCC (8) | Internal regulated supply rail | 7.2V LDO output powering gate driver and logic; must be bypassed with ≥4.7µF ceramic cap; can be externally powered above 7.5V. |
| SHDN/UVLO (9) | Enable/disable and input UVLO input | 1.22V falling threshold with programmable hysteresis; pulls below 0.4V to achieve <1µA shutdown IQ. |
| VIN (10) | Main input supply | 2.9V–40V input; requires local 0.22µF+ ceramic bypass; powers INTVCC regulator and internal circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity feedback architecture | Single FBX pin supports both +1.6V (boost/flyback/SEPIC) and –0.8V (inverting) output configurations without external level-shifting components. |
| Programmable soft-start with fault reset | SS pin capacitor sets controlled ramp; automatically resets on SHDN/UVLO undervoltage, INTVCC UV/OV, or thermal lockout. |
| Integrated 7.2V LDO with current limiting | Powers gate driver and internal logic; includes 2.7V UVLO and 17.5V OVLO; current limit prevents thermal runaway when driving large QG MOSFETs. |
| Frequency foldback during overload | Reduces switching frequency when FBX approaches GND during start-up or output short-circuit, limiting peak inductor current and stress. |
| AEC-Q100 Grade I qualification | Validated for automotive applications across –40°C to +125°C junction temperature; includes HTOL, ESD, and thermal cycling test reports. |
Applications
| Automotive LED Headlamp Driver | Industrial Isolated Flyback Supply |
|---|---|
Use Scenario: High-brightness LED array in vehicle headlamps requiring constant-current regulation from 9V–16V battery with cold-crank tolerance down to 6V. IC Role / Device Role / Timing Role: LT3757AIMSE#PBF operates in boost configuration, regulating LED current via SENSE pin while maintaining stable 500kHz switching synchronized to vehicle CAN bus clock via SYNC pin. Use Value: Achieves >92% efficiency at full load with programmable soft-start preventing inrush into capacitive LED loads and AEC-Q100 compliance ensuring reliability in under-hood thermal environments. | Use Scenario: 24V industrial PLC I/O module requiring isolated 5V/1A auxiliary supply with reinforced insulation and low EMI. IC Role / Device Role / Timing Role: LT3757AIMSE#PBF configured as flyback controller drives primary-side N-MOSFET; FBX referenced to secondary-side optocoupler feedback for tight cross-regulation. Use Value: Enables compact design using 300kHz switching (RT = 24.3kΩ), minimizes transformer size, and leverages frequency synchronization to avoid beat frequencies with nearby motor drives. |
| Portable Medical Pulse Oximeter | Telecom DC-DC Intermediate Bus Converter |
Use Scenario: Battery-powered oximeter needing ultra-low-quiescent 3.3V rail from single Li-ion cell (2.9V–4.2V) with minimal standby drain. IC Role / Device Role / Timing Role: LT3757AIMSE#PBF used in boost topology with 300kHz switching; SHDN/UVLO pin biased to disable IC below 2.95V to prevent brownout operation. Use Value: Delivers <1µA shutdown current and 2.9V minimum start-up, extending battery life beyond 100 hours in sleep mode while maintaining fast wake-up response. | Use Scenario: 48V telecom system requiring efficient 12V intermediate bus for downstream POL converters in dense rack-mounted equipment. IC Role / Device Role / Timing Role: LT3757AIMSE#PBF configured as SEPIC converter to handle wide 36V–72V input range; RT set to 100kHz for optimal core loss vs. copper loss balance. Use Value: Maintains >90% efficiency across full input range with no need for input pre-regulator; exposed-pad MSOP package enables conduction cooling onto metal chassis. |
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 but not AEC-Q100 qualified. | Not suitable for automotive safety-critical systems; acceptable for commercial/industrial boost/flyback designs. | Select when AEC-Q100 is not required and cost sensitivity outweighs automotive qualification. |
| LT3757AEMSE#PBF | Enhanced load transient response vs. LT3757AIMSE#PBF; identical AEC-Q100 Grade I rating and MSOP package. | Preferred for dynamic-load applications like servo power stages where output voltage recovery time matters. | Choose when faster transient response is needed and same automotive qualification is required. |
Compared with LT3757EMSE#PBF, LT3757AIMSE#PBF adds automotive qualification without sacrificing performance; compared with LT3757AEMSE#PBF, it trades minor transient improvement for identical qualification and lower cost in volume production.
Availability
LT3757AIMSE#PBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial isolated power supplies, portable medical instrumentation, and telecom intermediate bus converters requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LT3757AIMSE#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 digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3757 product line delivers high-voltage current-mode controllers optimized for rugged, wide-input DC/DC conversion in harsh environments-including automotive under-hood, industrial automation, and aerospace power systems.
FAQ
What is the maximum operating junction temperature for LT3757AIMSE#PBF?
The LT3757AIMSE#PBF has a maximum junction temperature of 125°C and is specified for continuous operation across –40°C to +125°C ambient. Its 10-pin MSOP package with exposed pad achieves θJA = 40°C/W when properly soldered to a thermal plane, allowing reliable operation in automotive under-hood applications where board temperatures reach 70°C.
Can LT3757AIMSE#PBF drive a P-channel MOSFET instead of an N-channel device?
No, LT3757AIMSE#PBF is designed exclusively to drive external N-channel MOSFETs via its GATE pin, which swings between INTVCC and GND. It lacks high-side gate drive capability or bootstrap circuitry required for P-channel or high-side N-channel configurations. For P-channel use, a discrete level-shifter or dedicated high-side driver is required outside the LT3757AIMSE#PBF control loop.
How does the LT3757AIMSE#PBF handle output short-circuit conditions?
During output short-circuit, LT3757AIMSE#PBF activates frequency foldback via the FBX pin, reducing switching frequency to limit peak inductor current. Simultaneously, the SENSE pin continuously monitors switch current against the 110mV threshold, forcing immediate cycle-by-cycle shutdown if exceeded. Soft-start is also reset, preventing uncontrolled current ramp-up upon recovery.
Is the INTVCC pin required to be bypassed even when using an external supply?
Yes, the INTVCC pin must always be bypassed with ≥4.7µF low-ESR ceramic capacitor placed adjacent to the pin-even when powered externally above 7.5V. This capacitor supplies high di/dt gate drive transients and stabilizes the internal regulator reference; omitting it risks erratic gate drive, increased EMI, and potential thermal shutdown due to localized voltage droop.
What is the purpose of the exposed pad (Pin 11) on the LT3757AIMSE#PBF MSOP package?
The exposed pad (Pin 11) on the LT3757AIMSE#PBF serves as the primary thermal path and electrical ground connection. It must be soldered directly to a solid PCB ground plane to achieve the specified θJA = 40°C/W and ensure reliable operation at full load. It also functions as the Kelvin return for the SENSE resistor's negative terminal, minimizing noise coupling into the current-sense path.
LT3757AIMSE#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
LT3757AIMSE#PBF FAQ
1.How can I place an order for LT3757AIMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757AIMSE#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 LT3757AIMSE#PBF reliable?
The price and inventory of LT3757AIMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757AIMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3757AIMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757AIMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757AIMSE#PBF?
LT3757AIMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757AIMSE#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 LT3757AIMSE#PBF?
For technical support, including LT3757AIMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757AIMSE#PBF requirements.
6.How does Aetrix verify that LT3757AIMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3757AIMSE#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 LT3757AIMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3757AIMSE#PBF?
All LT3757AIMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757AIMSE#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 LT3757AIMSE#PBF part is unused and in its original packaging.
Return procedure for LT3757AIMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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