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Analog Devices Inc. LT3757EMSE#PBF
- Part No.:
- LT3757EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757EMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,940
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Product details
Overview
LT3757EMSE#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 delivers 2.9V–40V input operation, programmable 50kHz–1MHz switching frequency, and internal 7.2V LDO for gate drive - enabling high-efficiency battery-powered or industrial power supplies.
For engineers reviewing the LT3757EMSE#PBF datasheet, LT3757EMSE#PBF pinout, LT3757EMSE#PBF application, or LT3757EMSE#PBF equivalent, key selection criteria include its negative/positive output configurability via FBX, soft-start and frequency foldback for fault robustness, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LT3757EMSE#PBF implements fixed-frequency current-mode control with slope compensation, where SENSE voltage plus ramp feeds the PWM comparator to regulate peak switch current. Its dual-reference error amplifier (1.6V for positive outputs, –0.8V for negative) enables topology-agnostic feedback without external polarity switching circuitry.
Internal protection includes INTVCC UV/OV lockout (2.7V/17.5V), FBX overvoltage detection (±8% to ±11%), thermal shutdown at 165°C, and programmable SHDN/UVLO with hysteresis. The 10-pin MSOP package integrates an exposed pad for thermal management (θJA = 40°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 40V - supports wide-range inputs including 12V/24V automotive rails and multi-cell Li-ion batteries. |
| Switching Frequency | 50kHz to 1MHz - set by RT resistor; enables trade-off between efficiency (lower f) and component size (higher f). |
| Feedback Reference | +1.6V or –0.8V - selectable via external resistor divider; eliminates need for separate positive/negative feedback networks. |
| SENSE Threshold | 110mV (typical) - sets precise current limit for MOSFET protection and loop stability. |
| Shutdown Current | <1µA - ensures ultra-low quiescent draw in battery-critical standby modes. |
| INTVCC Regulator | 7.2V LDO - powers gate driver and internal logic; bypassed with ≥4.7µF ceramic capacitor near pin. |
| Operating Temp Range | –40°C to +125°C - qualified for extended industrial and automotive under-hood environments. |
Pinout & Package
LT3757EMSE#PBF uses a thermally enhanced 10-lead plastic MSOP package (3mm × 3mm) with exposed pad (Pin 11) soldered to PCB ground for thermal conduction (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier compensation node | Accepts RC network to stabilize voltage loop; clamped during soft-start and faults. |
| FBX (Pin 2) | Unified feedback input | Dual-reference input (1.6V/–0.8V); determines output polarity and enables frequency foldback during overcurrent. |
| 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 | Resistor-to-GND sets oscillator frequency; open-circuit prohibited. |
| SYNC (Pin 5) | External clock synchronization | Accepts digital clock signal; requires RT setting 20% slower than SYNC frequency. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to MOSFET source-side sense resistor; monitors peak switch current for regulation and limiting. |
| GATE (Pin 7) | N-channel MOSFET driver output | Swings between INTVCC and GND; forced low during shutdown, thermal lockout, or INTVCC UV/OV. |
| INTVCC (Pin 8) | Internal LDO output | 7.2V regulated supply for gate driver and logic; must be bypassed with ≥4.7µF ceramic capacitor. |
| SHDN/UVLO (Pin 9) | Enable and input UV detection | 1.22V falling threshold with programmable hysteresis; resets soft-start on undervoltage. |
| VIN (Pin 10) | Main input supply | 2.9V–40V input; requires local 0.22µF+ bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, flyback, SEPIC, and inverting configurations - reduces BOM count and design iteration time. |
| Programmable Frequency | 50kHz–1MHz range via one RT resistor - simplifies EMI tuning and magnetics selection across applications. |
| Low IQ Shutdown | <1µA shutdown current - extends battery life in portable and always-on IoT edge nodes. |
| Integrated Protection | INTVCC UV/OV lockout, FBX overvoltage detection, thermal shutdown, and frequency foldback - enables robust operation without external supervision circuits. |
| AEC-Q100 Qualified | Grade E (–40°C to +125°C) - meets automotive reliability requirements for engine control, lighting, and ADAS subsystems. |
Applications
| Automotive LED Driver | Industrial Isolated Flyback Supply |
|---|---|
Use Scenario: Driving high-brightness LEDs in headlamps or DRL modules from 12V vehicle battery with tight thermal constraints. IC Role / Device Role / Timing Role: Flyback controller regulating constant current output; uses FBX reference and SENSE feedback for precision LED current control. Use Value: Enables single-chip solution with integrated 7.2V gate drive and thermal shutdown - eliminating discrete bias supplies and reducing board area by >30%. | Use Scenario: Generating isolated 5V/12V auxiliary rails for PLC I/O modules operating from 24V industrial bus. IC Role / Device Role / Timing Role: Flyback controller with primary-side sensing; leverages INTVCC UV lockout and programmable soft-start for reliable cold-start behavior. Use Value: Achieves >85% efficiency at full load while meeting IEC 61000-4-5 surge immunity via robust current-mode control and fast transient response. |
| Portable Medical Instrument Power | Telecom Boost Converter |
Use Scenario: Powering analog front-end and ADC in handheld ultrasound or glucose meters from single Li-ion cell (2.9V–4.2V). IC Role / Device Role / Timing Role: Boost controller with low minimum input voltage and frequency foldback - maintains regulation during battery discharge and short-circuit recovery. Use Value: Delivers stable 3.3V/5V output with <1µA shutdown current - extending device runtime beyond 72 hours on single charge. | Use Scenario: Generating 48V intermediate bus from 24V telecom rack supply for PoE++ injectors. IC Role / Device Role / Timing Role: High-voltage boost controller driving 100V MOSFET; uses RT programming and SYNC for EMI spread-spectrum compliance. Use Value: Supports 3A continuous output with <200ns minimum on-time - enabling compact 10µH inductor and minimizing footprint vs. competing controllers. |
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#PBF | Improved load transient response; identical pinout, specs, and package. | Better dynamic performance in rapidly varying loads (e.g., burst-mode RF amplifiers). | Select LT3757AEMSE#PBF when tighter output voltage regulation under step-load changes is required. |
| LM5122MM/NOPB | Wider 3V–65V input; no negative-output capability; different pinout and compensation architecture. | Suitable for high-input boost/flyback but not inverting or SEPIC; lacks dual-reference FBX. | Choose LM5122MM/NOPB only for high-VIN boost-only designs where negative output is unnecessary. |
Compared with LT3757EMSE#PBF, the LT3757AEMSE#PBF offers superior transient response without layout changes, while the LM5122MM/NOPB trades topology flexibility for higher input voltage range and requires redesign of compensation and feedback networks.
Availability
LT3757EMSE#PBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial isolated flyback supplies, portable medical instrument power, and telecom boost converters requiring stable component supply and long-term production continuity.
Supply support for LT3757EMSE#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 versatile, high-reliability DC/DC controllers optimized for demanding power conversion tasks - especially where topology flexibility, wide input range, and automotive qualification are critical.
FAQ
What is the maximum switching frequency supported by the LT3757EMSE#PBF?
The LT3757EMSE#PBF supports a programmable switching frequency range from 50kHz to 1MHz, set by an external resistor connected from the RT pin to ground. At 10.5kΩ, the typical frequency reaches 1MHz; values outside this range may cause instability or failure to start. The SYNC pin allows synchronization to an external clock up to 1MHz, provided the RT resistor is configured for 20% lower frequency.
Can the LT3757EMSE#PBF generate both positive and negative output voltages?
Yes, the LT3757EMSE#PBF generates either positive or negative output voltages using a single FBX pin. For positive outputs (boost/flyback/SEPIC), FBX is referenced to +1.6V; for negative outputs (inverting), it's referenced to –0.8V - selected automatically by the external resistor divider configuration. No additional components or mode pins are required.
What is the purpose of the exposed pad on the LT3757EMSE#PBF MSOP package?
The exposed pad (Pin 11) on the LT3757EMSE#PBF is electrically and thermally connected to GND. It must be soldered directly to a PCB ground plane to achieve the specified θJA of 40°C/W. This thermal path is essential for dissipating power during high-frequency, high-current operation - particularly when driving large-gate-charge MOSFETs at elevated ambient temperatures.
How does the LT3757EMSE#PBF handle overvoltage conditions on the FBX pin?
The LT3757EMSE#PBF includes dedicated overvoltage comparators for both polarities: if FBX exceeds +1.6V by 8% (≈ +1.73V), or falls below –0.8V by 11% (≈ –0.89V), the comparators trigger a reset pulse to the main latch, forcing the GATE pin low and halting switching. This protects downstream components during startup overshoot or output short-circuit recovery without requiring external crowbar circuits.
Is the LT3757EMSE#PBF pin-compatible with the LT3757AEMSE#PBF?
Yes, the LT3757EMSE#PBF and LT3757AEMSE#PBF share identical pinout, package (10-lead MSOP), and electrical specifications - including input voltage range, frequency range, and protection thresholds. The LT3757AEMSE#PBF improves load transient response but requires no PCB or schematic changes for drop-in replacement in existing designs.
LT3757EMSE#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
LT3757EMSE#PBF FAQ
1.How can I place an order for LT3757EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757EMSE#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 LT3757EMSE#PBF reliable?
The price and inventory of LT3757EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3757EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757EMSE#PBF?
LT3757EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757EMSE#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 LT3757EMSE#PBF?
For technical support, including LT3757EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757EMSE#PBF requirements.
6.How does Aetrix verify that LT3757EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3757EMSE#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 LT3757EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3757EMSE#PBF?
All LT3757EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757EMSE#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 LT3757EMSE#PBF part is unused and in its original packaging.
Return procedure for LT3757EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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