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Analog Devices Inc. LT3757MPMSE#PBF
- Part No.:
- LT3757MPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757MPMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:147
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Product details
Overview
LT3757MPMSE#PBF from Analog Devices is a wide-input (2.9V–40V), current-mode DC/DC controller supporting boost, flyback, SEPIC, and inverting topologies with single-feedback-pin polarity selection. It drives external N-channel MOSFETs via a 7.2V internal LDO, features programmable 50kHz–1MHz switching, <1µA shutdown current, and operates across –55°C to +150°C for harsh-environment automotive power conversion.
For engineers reviewing the LT3757MPMSE#PBF datasheet, LT3757MPMSE#PBF pinout, LT3757MPMSE#PBF application, or LT3757MPMSE#PBF equivalent, key selection criteria include its AEC-Q100 qualification, –55°C to +150°C extended temperature range, 10-pin MSOP thermal performance (θJA = 40°C/W), and dual feedback reference (±0.8V/1.6V) enabling both positive and negative output configurations without external op-amps.
Technical Context
The LT3757MPMSE#PBF implements fixed-frequency current-mode control with slope compensation, delivering stable regulation across wide input/output voltage ranges and load transients. Its error amplifier supports dual-reference operation (1.6V for positive outputs, –0.8V for negative outputs), and frequency foldback limits peak inductor current during startup and short-circuit events.
It integrates a 7.2V low-dropout regulator (LDO) for gate drive, with UVLO (2.7V) and OVLO (17.5V) protection on INTVCC, plus programmable SHDN/UVLO hysteresis and soft-start via external capacitor. The SYNC pin enables external clock synchronization with 20% slower RT-programmed base frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 40V - supports direct connection to 12V/24V automotive batteries and industrial rails without pre-regulation. |
| 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 configures polarity; eliminates need for external level-shifting circuitry. |
| Shutdown Current | <1µA - extends battery life in always-on vehicle modules like telematics or ADAS sensors. |
| Operating Temp Range | –55°C to +150°C - fully tested and guaranteed; meets under-hood automotive requirements per AEC-Q100 Grade 1. |
| Current Sense Threshold | 110mV (typ) - sets peak switch current; enables precise overcurrent protection with minimal sense resistor power loss. |
| INTVCC Regulator | 7.2V ±0.2V - powers gate driver and internal logic; bypassed with ≥4.7µF ceramic for transient gate charge delivery. |
Pinout & Package
LT3757MPMSE#PBF uses a thermally enhanced 10-lead MSOP package (3mm × 3mm) with exposed pad soldered to PCB ground for θJA = 40°C/W. Pin numbering follows standard top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier compensation node | Accepts RC network to stabilize voltage loop; directly controls PWM comparator threshold. |
| FBX (Pin 2) | Positive/negative feedback input | Sets output regulation point: 1.6V for boost/flyback/SEPIC, –0.8V for inverting; also triggers frequency foldback during faults. |
| SS (Pin 3) | Soft-start timing control | Charged by 10µA internal current source; external capacitor sets ramp time to limit inrush current. |
| RT (Pin 4) | Frequency programming input | Resistor to GND sets oscillator frequency; open-circuit disables operation. |
| SYNC (Pin 5) | External clock synchronization | Accepts digital clock signal; requires RT setting 20% below SYNC frequency for reliable locking. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to MOSFET source resistor; compares against 110mV threshold for cycle-by-cycle current limiting. |
| GATE (Pin 7) | N-channel MOSFET driver output | Swings between INTVCC and GND; actively pulled low during shutdown, thermal fault, 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 near pin. |
| SHDN/UVLO (Pin 9) | Enable and input undervoltage detection | 1.22V falling threshold with programmable hysteresis; resets soft-start on undervoltage event. |
| VIN (Pin 10) | Main input supply | 2.9V–40V input; requires local 0.22µF+ ceramic bypass; powers internal LDO and bias circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity feedback architecture | Single FBX pin supports +1.6V or –0.8V regulation references - eliminates external op-amp or level shifter in inverting designs. |
| Programmable frequency with sync capability | 50kHz–1MHz RT-set frequency + SYNC pin - enables EMI reduction via spread-spectrum or multi-phase synchronization. |
| Thermally robust MSOP package | 10-pin MSOP with exposed pad (θJA = 40°C/W) - sustains 150°C junction temperature in high-power density automotive layouts. |
| AEC-Q100 qualified | Grade 1 (–40°C to +125°C ambient) and MP grade (–55°C to +150°C) - validated for under-hood automotive applications including engine control and lighting. |
| Integrated protection functions | INTVCC UV/OV lockout, thermal shutdown, frequency foldback, and FBX overvoltage reset - reduces external component count for safety-critical systems. |
Applications
| Automotive LED Headlamp Driver | Industrial Isolated Flyback Supply |
|---|---|
Use Scenario: High-brightness LED arrays in adaptive front-lighting systems requiring 48V output from 12V battery with tight dimming control. IC Role / Device Role / Timing Role: Flyback controller regulating isolated output; FBX referenced to –0.8V enables negative secondary-side sensing for accurate current regulation. Use Value: Eliminates optocoupler and TL431, reducing BOM cost and improving long-term stability across –40°C to +125°C ambient. | Use Scenario: 24V-to-5V/1A isolated auxiliary supply in PLC I/O modules operating in factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller; INTVCC powered from VOUT via blocking diode to improve efficiency and reduce heat in sealed enclosures. Use Value: Achieves >85% efficiency at full load while maintaining ±3% output regulation across 0–100% load and –25°C to +70°C ambient. |
| Telecom Boost Converter | Portable Medical Instrument Power |
Use Scenario: 3.3V-to-48V boost converter powering PoE midspans in telecom cabinets with limited airflow. IC Role / Device Role / Timing Role: Boost controller with 300kHz switching (RT = 41.2kΩ); GATE drives 25mΩ MOSFET with 22nC QG. Use Value: Delivers 1.2A continuous output with <50mVpp ripple using 10µH inductor and 47µF output capacitance. | Use Scenario: Battery-powered ultrasound probe requiring ultra-low quiescent current and cold-temperature startup down to –30°C. IC Role / Device Role / Timing Role: SEPIC controller with soft-start and <1µA shutdown IQ; VIN supplied from Li-ion (2.9V–4.2V). Use Value: Enables 12-hour standby time on single cell; maintains regulation during 100ms brownout events via 100µF input bulk capacitance. |
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 | Same pinout and function; improved load transient response and tighter FBX reference tolerance (±0.75% vs ±0.9%). | Better suited for fast-dynamic loads like RF power amplifiers; not rated for –55°C operation. | Select LT3757AEMSE#PBF when transient performance outweighs extended temperature requirement. |
| LM5122MMX/NOPB | Wider 3V–65V input, integrated high-side gate driver, but only supports positive outputs and lacks negative FBX reference. | Requires external level-shifting for inverting topologies; no native support for flyback with negative output. | Choose LM5122MMX/NOPB for high-voltage boost/flyback where negative output is unnecessary and layout space is constrained. |
Compared with LT3757AEMSE#PBF, the LT3757MPMSE#PBF trades minor transient performance for guaranteed –55°C operation and AEC-Q100 compliance; versus LM5122MMX/NOPB, it retains unique dual-polarity feedback and superior low-temperature reliability at the cost of lower max input voltage and no integrated high-side driver.
Availability
LT3757MPMSE#PBF is available at Aetrix Electronics and suitable for automotive lighting, industrial power supplies, and portable medical equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3757MPMSE#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 precision instrumentation, industrial automation, and automotive markets.
The LT3757 product line delivers rugged, wide-input DC/DC controllers optimized for automotive and industrial power conversion where reliability across extreme temperatures and input conditions is mandatory.
FAQ
What is the guaranteed operating temperature range for LT3757MPMSE#PBF?
The LT3757MPMSE#PBF is 100% tested and guaranteed over –55°C to +150°C junction temperature, meeting AEC-Q100 Grade 1 requirements for under-hood automotive use. This exceeds standard commercial and industrial grades and ensures functionality in engine bay or industrial furnace environments where ambient temperatures exceed 125°C.
How does LT3757MPMSE#PBF support both positive and negative output voltages?
The LT3757MPMSE#PBF uses a single FBX pin with dual internal references: +1.6V for boost/flyback/SEPIC configurations and –0.8V for inverting topologies. The IC automatically selects the active reference based on FBX voltage polarity relative to ground, eliminating external op-amps or level shifters required by most competing controllers.
Can LT3757MPMSE#PBF synchronize to an external clock, and what is the required setup?
Yes, LT3757MPMSE#PBF supports synchronization via the SYNC pin. To ensure reliable locking, the RT resistor must be selected to program a base switching frequency 20% slower than the external clock frequency. The SYNC signal must be a clean digital waveform with minimum pulse width of 200ns; tie SYNC to GND if unused.
What is the purpose of the exposed pad on the LT3757MPMSE#PBF MSOP package?
The exposed pad on LT3757MPMSE#PBF is electrically connected to GND and serves as the primary thermal path. When soldered to a full PCB copper plane, it achieves θJA = 40°C/W - critical for sustaining 150°C junction temperature in high-power-density automotive applications without forced air cooling.
Does LT3757MPMSE#PBF include protection against output overvoltage conditions?
Yes, LT3757MPMSE#PBF incorporates dual overvoltage protection: FBX > +1.6V + 8% (≈ +1.73V) or FBX < –0.8V – 11% (≈ –0.89V) triggers immediate latch-off of the GATE driver. This prevents damage to downstream components during startup overshoot or short-circuit recovery in boost, flyback, and SEPIC converters.
LT3757MPMSE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3757MPMSE#PBF FAQ
1.How can I place an order for LT3757MPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757MPMSE#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 LT3757MPMSE#PBF reliable?
The price and inventory of LT3757MPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757MPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3757MPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757MPMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757MPMSE#PBF?
LT3757MPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757MPMSE#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 LT3757MPMSE#PBF?
For technical support, including LT3757MPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757MPMSE#PBF requirements.
6.How does Aetrix verify that LT3757MPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3757MPMSE#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 LT3757MPMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3757MPMSE#PBF?
All LT3757MPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757MPMSE#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 LT3757MPMSE#PBF part is unused and in its original packaging.
Return procedure for LT3757MPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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