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Analog Devices Inc. LT3757AHMSE#PBF
- Part No.:
- LT3757AHMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757AHMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:142
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Product details
Overview
LT3757AHMSE#PBF from Analog Devices is a wide-input, current-mode DC/DC controller for boost, flyback, SEPIC, and inverting topologies. It drives an external N-channel MOSFET, supports ±2.9V to 40V input, delivers programmable 50kHz–1MHz switching, features 1.6V/–0.8V dual feedback regulation, and operates up to 150°C junction temperature-ideal for automotive high-temperature power conversion.
For engineers reviewing the LT3757AHMSE#PBF datasheet, LT3757AHMSE#PBF pinout, LT3757AHMSE#PBF application, or LT3757AHMSE#PBF equivalent, key selection criteria include its AEC-Q100 qualification, 7.2V internal LDO, soft-start and frequency foldback protection, and MSOP-10 thermal performance at 40°C/W θJA.
Technical Context
The LT3757AHMSE#PBF implements fixed-frequency current-mode control with slope compensation, enabling stable operation across wide VIN (2.9V–40V) and VOUT ranges. Its dual-regulation architecture supports both positive (1.6V FBX reference) and negative (–0.8V FBX reference) output configurations using a single feedback pin.
It integrates a 7.2V low-dropout regulator for gate drive, programmable UVLO with hysteresis on SHDN/UVLO, and synchronized switching via the SYNC pin. Frequency foldback and soft-start limit inductor current during startup and short-circuit events-critical for robust automotive and industrial converter designs.
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 |
| Feedback Reference | +1.6V or –0.8V - single-pin programmable polarity for boost/flyback/SEPIC/inverting outputs |
| INTVCC Regulator | 7.2V LDO - powers gate driver and internal circuitry; bypassed with ≥4.7µF ceramic capacitor |
| Shutdown Current | <1µA - enables ultra-low-power battery hold-up and wake-on-event systems |
| Operating Temperature | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive use |
| Current Sense Threshold | 110mV (typ) - sets peak switch current; enables accurate overcurrent protection |
Pinout & Package
LT3757AHMSE#PBF is housed in a thermally enhanced 10-lead plastic MSOP package (3mm × 3mm) with exposed pad (Pin 11) soldered to PCB ground for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (1) | Error amplifier compensation node | Accepts RC network to stabilize voltage loop; clamped during soft-start |
| FBX (2) | Positive/negative feedback input | Dual-reference pin: regulates to +1.6V (boost/flyback/SEPIC) or –0.8V (inverting); enables polarity selection |
| SS (3) | Soft-start control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; resets on UV/OV/thermal fault |
| RT (4) | Frequency programming | Resistor-to-GND sets oscillator frequency (50kHz–1MHz); open-circuit disables operation |
| SYNC (5) | External clock synchronization | Accepts digital clock; requires RT setting 20% below 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 cycle-by-cycle limiting |
| GATE (7) | N-MOSFET gate driver output | Swings between INTVCC and GND; forced low during shutdown, thermal lockout, 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 |
| SHDN/UVLO (9) | Enable and input UV detection | 1.22V falling threshold with programmable hysteresis; <0.4V forces shutdown and sub-1µA IQ |
| VIN (10) | Main input supply | 2.9V–40V input; locally bypassed with ≥0.22µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range support | 2.9V–40V operation enables direct connection to 12V/24V automotive batteries and industrial supplies |
| Dual-polarity feedback | Single FBX pin supports both +1.6V and –0.8V references-eliminates need for separate topology-specific ICs |
| Thermal robustness | AEC-Q100 Grade H qualification and 150°C max junction temperature suit under-hood and engine-control applications |
| Protection suite | Integrated soft-start, frequency foldback, INTVCC UV/OV lockout, and thermal shutdown prevent damage during fault conditions |
| Synchronization capability | SYNC pin allows deterministic timing alignment with system clocks-essential for EMI reduction in multi-rail systems |
Applications
| Automotive LED Headlamp Driver | Industrial Isolated Flyback PSU |
|---|---|
Use Scenario: High-brightness LED arrays in vehicle headlamps require tightly regulated constant-current output from 9V–16V battery input. IC Role / Device Role / Timing Role: LT3757AHMSE#PBF operates in boost configuration, regulating LED current via SENSE feedback while maintaining 300kHz switching for compact magnetics. Use Value: AEC-Q100 qualification ensures reliability in vibration-prone environments; 150°C rating accommodates under-hood thermal stress. | Use Scenario: Factory automation PLCs demand isolated 5V/12V auxiliary rails from unregulated 24V–48V DC bus with low EMI. IC Role / Device Role / Timing Role: LT3757AHMSE#PBF configured as flyback controller provides galvanic isolation; SYNC pin aligns switching to master clock to suppress conducted noise. Use Value: Programmable UVLO prevents brownout restarts; 7.2V INTVCC LDO ensures consistent gate drive across input transients. |
| Telecom SEPIC Power Module | Portable Medical Inverter Supply |
Use Scenario: Telecom line cards require non-inverting 3.3V/5V outputs from fluctuating -48V nominal input with no polarity reversal. IC Role / Device Role / Timing Role: LT3757AHMSE#PBF used in SEPIC topology accepts negative input while delivering positive regulated output; RT resistor sets 500kHz for small footprint. Use Value: Dual feedback reference eliminates need for level-shifting circuits; 40°C/W θJA enables convection-cooled board layout. | Use Scenario: Portable ultrasound devices need isolated –5V rail for analog front-end biasing from single-cell Li-ion (2.9V–4.2V) input. IC Role / Device Role / Timing Role: LT3757AHMSE#PBF configured as inverting converter uses –0.8V FBX reference to regulate negative output; soft-start prevents inrush into capacitive loads. Use Value: Sub-1µA shutdown current extends battery life; 2.9V minimum VIN enables full discharge utilization of Li-ion cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757HMSE#PBF | Same pinout and electrical specs, but LT3757 (non-A) variant; slower load transient response vs. LT3757A | Lacks improved transient performance of LT3757A; suitable where dynamic load step requirements are relaxed | Select LT3757HMSE#PBF only if cost sensitivity outweighs need for fast load regulation in automotive modules |
| LT3758AHMSE#PBF | Successor with higher 60V VIN max, integrated boost diode driver, and enhanced current sensing accuracy | Supports wider input range and higher power density; not drop-in due to different pin functions (e.g., BOOST pin) | Choose LT3758AHMSE#PBF for new designs requiring >40V input or tighter current-sense tolerance; not a replacement for existing LT3757A layouts |
Compared with LT3757HMSE#PBF, the LT3757AHMSE#PBF delivers superior load transient response critical for LED dimming and servo control; versus LT3758AHMSE#PBF, it offers proven AEC-Q100 reliability at lower complexity and cost for 40V-class applications.
Availability
LT3757AHMSE#PBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial flyback PSUs, telecom SEPIC modules, and portable medical inverters requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LT3757AHMSE#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 automotive, industrial, and communications markets with precision, reliability, and innovation.
The LT3757A product line delivers rugged, wide-input DC/DC controllers optimized for demanding automotive and industrial power conversion-emphasizing thermal resilience, fault protection, and topology flexibility across boost, flyback, SEPIC, and inverting architectures.
FAQ
What is the maximum operating junction temperature for LT3757AHMSE#PBF?
The LT3757AHMSE#PBF is rated for a maximum junction temperature of +150°C and is AEC-Q100 qualified for automotive Grade H applications. Its MSOP-10 package with exposed pad achieves θJA = 40°C/W when properly soldered to a thermal plane, enabling reliable operation in under-hood environments. Derating is required above 125°C to maintain long-term reliability.
How does LT3757AHMSE#PBF support both positive and negative output voltages?
The LT3757AHMSE#PBF uses a single FBX pin with dual internal references: +1.6V for positive-output topologies (boost, flyback, SEPIC) and –0.8V for negative-output inverting converters. The feedback divider network pulls FBX to the appropriate reference voltage, automatically selecting the active error amplifier-no external mode-select pins or configuration resistors are needed.
Can LT3757AHMSE#PBF synchronize to an external clock, and what are the requirements?
Yes, the LT3757AHMSE#PBF supports synchronization via its SYNC pin. To ensure stable locking, the external clock frequency must exceed the RT-set frequency by at least 20%, and the SYNC pulse width must be ≥200ns. The SYNC pin must be tied to GND if unused. This feature enables EMI reduction in multi-converter systems by eliminating beat frequencies.
What is the purpose of the INTVCC pin on LT3757AHMSE#PBF, and how should it be bypassed?
The INTVCC pin on LT3757AHMSE#PBF delivers a regulated 7.2V supply for the gate driver and internal circuitry. It must be bypassed with a minimum 4.7µF low-ESR ceramic capacitor placed directly between INTVCC and GND, adjacent to the IC. Failure to provide adequate bypassing risks gate drive instability and thermal overstress during high-frequency MOSFET switching.
Is LT3757AHMSE#PBF pin-compatible with LT3757EMSE#PBF?
No, LT3757AHMSE#PBF is not pin-compatible with LT3757EMSE#PBF. While both share the same MSOP-10 package and pinout, the LT3757A variant includes design improvements-including enhanced load transient response and tighter parameter tolerances-that do not affect physical compatibility but require validation in the target application. Electrical behavior differences necessitate full requalification.
LT3757AHMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3757AHMSE#PBF FAQ
1.How can I place an order for LT3757AHMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757AHMSE#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 LT3757AHMSE#PBF reliable?
The price and inventory of LT3757AHMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757AHMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3757AHMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757AHMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757AHMSE#PBF?
LT3757AHMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757AHMSE#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 LT3757AHMSE#PBF?
For technical support, including LT3757AHMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757AHMSE#PBF requirements.
6.How does Aetrix verify that LT3757AHMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3757AHMSE#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 LT3757AHMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3757AHMSE#PBF?
All LT3757AHMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757AHMSE#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 LT3757AHMSE#PBF part is unused and in its original packaging.
Return procedure for LT3757AHMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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