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Analog Devices Inc. LT3757AIMSE#TRPBF
- Part No.:
- LT3757AIMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757AIMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,775
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Product details
Overview
LT3757AIMSE#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, features soft-start, frequency foldback, and AEC-Q100 qualification for automotive power conversion.
For engineers reviewing the LT3757AIMSE#TRPBF datasheet, LT3757AIMSE#TRPBF pinout, LT3757AIMSE#TRPBF application, or LT3757AIMSE#TRPBF equivalent, key selection criteria include its dual-polarity feedback capability (1.6V/–0.8V FBX thresholds), 10-pin MSOP thermal performance (θJA = 40°C/W), and precise SHDN/UVLO hysteresis programming - all critical for battery-powered and automotive DC/DC designs requiring robust transient response and fault protection.
Technical Context
The LT3757AIMSE#TRPBF implements fixed-frequency current-mode control with slope compensation, where SENSE voltage plus ramp is compared to VC to determine MOSFET on-time. Its dual-comparator FBX architecture enables seamless positive- or negative-output configuration without external mode switches.
It integrates a 7.2V LDO for gate drive (with 2.7V UVLO and 17.5V OVLO), programmable RT-based oscillator, SYNC input for external clock synchronization, and dedicated SS, VC, and SHDN/UVLO pins for startup sequencing, loop compensation, and supply monitoring - all operating across –40°C to 125°C.
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 conditions. |
| Switching Frequency | 50kHz to 1MHz via RT resistor - enables optimization of efficiency vs. size; 300kHz typical with 41.2kΩ. |
| FBX Regulation Voltage | +1.6V or –0.8V - single-pin polarity-selectable feedback reference for boost/flyback or inverting/SEPIC outputs. |
| SENSE Threshold | 110mV (typ) - sets peak current limit; determines maximum switch current before cycle-by-cycle shutdown. |
| Shutdown Current | <1µA - minimizes battery drain in always-on systems like telematics or ADAS sensors. |
| INTVCC Regulator | 7.2V ±0.2V LDO - powers gate driver and internal logic; bypassed with ≥4.7µF ceramic capacitor. |
| Operating Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade I, suitable for under-hood automotive environments. |
Pinout & Package
LT3757AIMSE#TRPBF uses a thermally enhanced 10-lead MSOP package (3mm × 3mm) with exposed pad (Pin 11) soldered to PCB ground for θJA = 40°C/W. Pin functions are validated per Analog Devices Rev. H datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (1) | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; clamped during soft-start. |
| FBX (2) | Feedback input | Accepts divided output voltage; selects +1.6V or –0.8V reference based on polarity; triggers frequency foldback near GND. |
| SS (3) | Soft-start control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UV/OV/thermal faults. |
| RT (4) | Oscillator timing | Resistor-to-GND sets switching frequency; open circuit disables operation. |
| SYNC (5) | External clock sync input | Accepts digital clock; requires RT set 20% slower than SYNC frequency; ignored when FBX near GND. |
| SENSE (6) | Current sense input | Kelvin-connected to MOSFET source-side sense resistor; compares to 110mV threshold for overcurrent protection. |
| GATE (7) | N-MOSFET driver output | Sources/sinks to INTVCC/GND; forced low during shutdown, thermal lockout, or INTVCC fault. |
| INTVCC (8) | Internal LDO output | 7.2V regulated supply for gate driver and logic; must be bypassed with ≥4.7µF ceramic cap. |
| SHDN/UVLO (9) | Enable & input undervoltage monitor | 1.22V falling threshold with programmable hysteresis; resets soft-start on undervoltage. |
| VIN (10) | Main input supply | 2.9V–40V input; locally bypassed with ≥0.22µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity feedback architecture | Single FBX pin supports both +1.6V and –0.8V regulation references - eliminates need for external polarity-selection logic in multi-rail converters. |
| Programmable UVLO with hysteresis | SHDN/UVLO pin allows precise turn-on/off thresholds using external resistors - ensures reliable startup across varying battery states. |
| Frequency foldback during overload | Reduces switching frequency when FBX approaches GND - limits inductor current during short-circuit or start-up stress without external circuitry. |
| Thermally optimized MSOP package | Exposed pad and 40°C/W θJA enable high-power density designs up to 125°C ambient - reduces heatsink requirements in space-constrained automotive modules. |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation with automotive reliability testing - meets functional safety requirements for non-safety-critical power stages. |
Applications
| Automotive LED Headlamp Driver | Industrial Isolated Flyback PSU |
|---|---|
Use Scenario: Driving high-brightness LEDs in vehicle headlamps requiring constant-current regulation from 9V–16V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: LT3757AIMSE#TRPBF operates as a boost controller with analog dimming via FBX, managing MOSFET gate drive and current sensing at 300kHz. Use Value: 2.9V minimum VIN enables operation during engine cranking; <1µA shutdown current preserves battery life during vehicle sleep mode. | Use Scenario: Generating isolated 24V/1A output from 24VDC industrial bus with reinforced insulation and EMI compliance. IC Role / Device Role / Timing Role: LT3757AIMSE#TRPBF configures as primary-side flyback controller with optocoupler feedback, synchronizing to system clock via SYNC pin. Use Value: Programmable 50kHz–1MHz frequency allows EMI spread-spectrum tuning; 7.2V INTVCC ensures stable gate drive across line transients. |
| Portable Medical Imaging Power | Telecom DC-DC Intermediate Bus |
Use Scenario: Supplying ±15V rails for CCD sensor bias in handheld ultrasound devices powered by Li-ion batteries. IC Role / Device Role / Timing Role: LT3757AIMSE#TRPBF operates in inverting topology using –0.8V FBX reference, delivering negative output with tight regulation and low noise. Use Value: Dual FBX thresholds eliminate separate ICs for positive/negative rails; soft-start prevents inrush into sensitive analog front-end circuitry. | Use Scenario: Stepping 48V telecom rectifier output down to 12V intermediate bus for downstream POL converters in base station equipment. IC Role / Device Role / Timing Role: LT3757AIMSE#TRPBF configured as SEPIC controller to handle wide input variation and maintain regulation during load dumps. Use Value: 40V absolute max VIN withstands 48V bus transients; frequency synchronization avoids beat frequencies with adjacent RF subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3758AIMSE#TRPBF | Includes integrated high-side gate driver and bootstrap diode; supports synchronous rectification in boost/flyback. | Better suited for higher-efficiency, lower-component-count designs where synchronous MOSFET control is required. | Select LT3758AIMSE#TRPBF when replacing external N-MOSFET with integrated driver reduces BOM count and improves layout compactness. |
| UCC28C43DR | Fixed 100kHz frequency; no programmable RT or SYNC; 16V max VIN; no dual-polarity FBX. | Limited to low-voltage, cost-sensitive industrial supplies where wide input range and polarity flexibility are unnecessary. | Choose UCC28C43DR only for simple 12V–24V boost applications with minimal feature requirements and strict cost targets. |
Compared with LT3758AIMSE#TRPBF, the LT3757AIMSE#TRPBF offers greater design flexibility with external MOSFET control and wider input range but requires more external components; versus UCC28C43DR, it delivers superior automotive-grade reliability, programmability, and bipolar output capability at higher cost and complexity.
Availability
LT3757AIMSE#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 extended temperature operation.
Supply support for LT3757AIMSE#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 markets.
The LT3757 product line delivers high-voltage current-mode controllers optimized for rugged, wide-input DC/DC conversion in automotive, industrial, and telecom power systems - emphasizing reliability, thermal robustness, and flexible topology support.
FAQ
What is the minimum input voltage supported by the LT3757AIMSE#TRPBF?
The LT3757AIMSE#TRPBF supports a minimum input voltage of 2.9V, enabling reliable operation during automotive cold-crank events and from partially discharged lithium-ion batteries. This specification is guaranteed across the full –40°C to +125°C operating temperature range and is validated per Analog Devices Rev. H datasheet Absolute Maximum Ratings and Electrical Characteristics tables.
How does the LT3757AIMSE#TRPBF achieve dual-polarity output voltage control?
The LT3757AIMSE#TRPBF achieves dual-polarity control through its FBX pin, which accepts either a positive or negative feedback voltage: when pulled above GND via resistor divider, it regulates to +1.6V; when pulled below GND, it regulates to –0.8V. This eliminates external mode-selection circuitry and allows single-controller implementation of boost, flyback, SEPIC, or inverting topologies - confirmed in the Applications Information section of the LT3757/LT3757A Rev. H datasheet.
Can the LT3757AIMSE#TRPBF synchronize to an external clock, and what are the constraints?
Yes, the LT3757AIMSE#TRPBF can synchronize to an external clock via the SYNC pin, accepting digital pulses with minimum 200ns width. To ensure stable locking, the RT resistor must be selected to program a free-running frequency 20% slower than the SYNC frequency. The SYNC function is disabled when FBX voltage is near GND - a behavior verified in the Pin Functions and Applications Information sections of the official datasheet.
What thermal performance can be expected from the LT3757AIMSE#TRPBF in its MSOP package?
The LT3757AIMSE#TRPBF in the 10-lead MSOP package achieves θJA = 40°C/W when the exposed pad (Pin 11) is properly soldered to a full PCB ground plane. This value is specified in the Absolute Maximum Ratings table and confirmed in the Thermal Considerations section of the Rev. H datasheet. At 70°C ambient and 125°C max junction temperature, this enables ~1.28W of dissipation before thermal derating begins.
Is the LT3757AIMSE#TRPBF qualified for automotive applications, and what does that entail?
Yes, the LT3757AIMSE#TRPBF is AEC-Q100 Grade I qualified (–40°C to +125°C), with manufacturing and test processes controlled to meet automotive reliability standards. This qualification covers HTOL, temperature cycling, ESD, and other stress tests defined in the AEC-Q100 standard - explicitly stated in the Order Information and Features sections of the LT3757/LT3757A Rev. H datasheet.
LT3757AIMSE#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
LT3757AIMSE#TRPBF FAQ
1.How can I place an order for LT3757AIMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757AIMSE#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 LT3757AIMSE#TRPBF reliable?
The price and inventory of LT3757AIMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757AIMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3757AIMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757AIMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757AIMSE#TRPBF?
LT3757AIMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757AIMSE#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 LT3757AIMSE#TRPBF?
For technical support, including LT3757AIMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757AIMSE#TRPBF requirements.
6.How does Aetrix verify that LT3757AIMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3757AIMSE#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 LT3757AIMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3757AIMSE#TRPBF?
All LT3757AIMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757AIMSE#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 LT3757AIMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3757AIMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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