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Analog Devices Inc. LT3757MPMSE#TRPBF
- Part No.:
- LT3757MPMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757MPMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,309
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Product details
Overview
LT3757MPMSE#TRPBF 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 ±0.8V/1.6V feedback thresholds, operates from 2.9V to 40V input, delivers programmable 50kHz–1MHz switching, and features <1µA shutdown current - enabling high-efficiency battery-powered automotive power supplies.
For engineers reviewing the LT3757MPMSE#TRPBF datasheet, LT3757MPMSE#TRPBF pinout, LT3757MPMSE#TRPBF application, or LT3757MPMSE#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature rating, AEC-Q100 qualification, internal 7.2V LDO, programmable UVLO with hysteresis, and frequency synchronization capability via SYNC pin.
Technical Context
The LT3757MPMSE#TRPBF implements fixed-frequency current-mode control with slope compensation, using SENSE voltage plus ramp summation at the PWM comparator to regulate peak switch current. Its dual-reference FBX pin (±0.8V/1.6V) enables seamless positive- or negative-output configuration without external logic.
It integrates a 7.2V low-dropout regulator for gate drive, with undervoltage lockout (2.7V) and overvoltage protection (17.5V) on INTVCC, plus thermal shutdown and frequency foldback during overload - all validated across –55°C to 150°C junction temperature per AEC-Q100 MP-grade testing.
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 load-dump (40V) conditions. |
| Switching Frequency | 50kHz to 1MHz - set by RT resistor; enables optimization of efficiency vs. magnetics size and EMI compliance. |
| Feedback Reference | +1.6V or –0.8V - single-pin polarity-selectable regulation threshold simplifies design of both positive and negative output converters. |
| Shutdown Current | <1µA - minimizes battery drain in always-on automotive modules such as telematics or ADAS sensors. |
| INTVCC Regulator | 7.2V ±0.2V LDO - powers gate driver and internal circuitry; bypassed with ≥4.7µF ceramic capacitor for stable high-current drive. |
| Operating Temperature | –55°C to +150°C - fully tested and guaranteed per AEC-Q100 Grade MP, suitable for under-hood and powertrain applications. |
| Current Sense Threshold | 110mV (typical) - sets precise peak current limit; enables accurate overcurrent protection with low-value sense resistors. |
Pinout & Package
LT3757MPMSE#TRPBF uses a thermally enhanced 10-lead 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 (Pin 1) | Error amplifier compensation node | Accepts RC network to stabilize voltage loop; clamped during soft-start and fault conditions. |
| FBX (Pin 2) | Positive/negative feedback input | Dual-reference input (±0.8V/1.6V) determines output polarity and regulates output voltage via external divider. |
| SS (Pin 3) | Soft-start timing control | 10µA pull-up to 2.5V rail; external capacitor sets startup ramp time and resets on UV/OV/thermal faults. |
| RT (Pin 4) | Frequency programming node | Resistor to GND sets oscillator frequency; open connection disables operation. |
| SYNC (Pin 5) | External clock synchronization input | Accepts digital clock signal; requires RT setting 20% slower than SYNC frequency for reliable locking. |
| SENSE (Pin 6) | Current sense amplifier input | Kelvin-connected to MOSFET source-side sense resistor; monitors peak switch current for cycle-by-cycle limiting. |
| GATE (Pin 7) | N-channel MOSFET gate driver output | Drives external FET between INTVCC and GND; forced low during shutdown, thermal fault, or INTVCC UV/OV. |
| INTVCC (Pin 8) | Internal regulated supply output | 7.2V LDO output powering gate driver and logic; must be bypassed with ≥4.7µF ceramic capacitor near pin. |
| SHDN/UVLO (Pin 9) | Enable/disable and input UVLO control | 1.22V falling threshold with programmable hysteresis; pulls VIN current below 1µA when held ≤0.4V. |
| VIN (Pin 10) | Main input supply input | 2.9V–40V input; requires local 0.22µF+ ceramic bypass capacitor; powers internal LDO and bias circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (2.9V–40V) | Enables direct operation from 12V/24V automotive batteries, including cold-crank and load-dump transients. |
| Single-pin polarity-selectable feedback (±0.8V/1.6V) | Eliminates need for external polarity-switching circuitry in dual-rail or bipolar output designs. |
| Programmable 50kHz–1MHz switching | Allows trade-off between efficiency (lower f) and component size (higher f), with precise RT-resistor-based setting. |
| AEC-Q100 Grade MP (–55°C to +150°C) | Guaranteed 100% tested performance for under-hood automotive applications requiring extreme reliability. |
| Frequency synchronization (SYNC pin) | Enables deterministic EMI reduction by aligning switching edges with system clock or other converters. |
| Integrated 7.2V LDO with UV/OV protection | Provides robust gate drive without external bias supply; shuts down gate driver if INTVCC falls below 2.7V or exceeds 17.5V. |
Applications
| Automotive LED Headlamp Driver | Industrial Isolated Flyback PSU |
|---|---|
Use Scenario: High-brightness LED arrays in automotive headlamps require tightly regulated constant-current output with fast transient response during beam pattern switching. IC Role / Device Role / Timing Role: LT3757MPMSE#TRPBF operates in boost configuration to generate >48V from 12V battery, regulating LED current via SENSE feedback while maintaining <1µA quiescent draw in standby. Use Value: AEC-Q100 MP-grade operation ensures reliability at 150°C ambient; programmable soft-start prevents inrush into large LED capacitance. | Use Scenario: Industrial PLC I/O modules require isolated 5V/12V rails from unregulated 24V DC bus, with tight regulation and immunity to line transients. IC Role / Device Role / Timing Role: LT3757MPMSE#TRPBF configured as flyback controller drives primary-side MOSFET; FBX referenced to secondary-side optocoupler feedback enables precise cross-regulation. Use Value: Wide 2.9V–40V input accommodates brownout and surge conditions; current-mode control provides inherent loop stability across variable loads. |
| Portable Medical Instrument Power | Telecom DC-DC Intermediate Bus Converter |
Use Scenario: Battery-powered ultrasound or patient monitor devices need efficient, low-noise ±15V analog rails from single-cell Li-ion (2.9V–4.2V). IC Role / Device Role / Timing Role: LT3757MPMSE#TRPBF used in inverting topology generates –15V; FBX referenced to negative rail enables direct regulation without level-shifting. Use Value: Sub-1µA shutdown current extends battery life; 50kHz minimum frequency allows use of small, low-ESR ceramic capacitors. | Use Scenario: Telecom base station power systems require high-efficiency 48V-to-12V intermediate bus conversion with strict EMI limits and thermal constraints. IC Role / Device Role / Timing Role: LT3757MPMSE#TRPBF configured as SEPIC converter provides non-inverting step-down with inherent input/output isolation and continuous input current. Use Value: SYNC pin enables synchronization to system clock to avoid beat frequencies; 150°C-rated package supports high-density board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3757EMSE#TRPBF | Same architecture but rated for –40°C to 125°C; lacks AEC-Q100 MP-grade validation and extended low-temp operation. | Suitable for commercial/industrial environments only; not qualified for automotive under-hood deployment. | Select LTC3757EMSE#TRPBF only when full –55°C operation and automotive qualification are unnecessary. |
| LT3758MPMSE#TRPBF | Includes integrated high-side gate driver and bootstrap diode; supports high-side N-MOSFET in buck-boost/flyback; no SENSE pin. | Designed for high-side switch topologies; incompatible pinout and control scheme - not drop-in replaceable. | Choose LT3758MPMSE#TRPBF only when high-side drive and integrated bootstrap are required; not a functional substitute for LT3757MPMSE#TRPBF. |
Compared with LTC3757EMSE#TRPBF, LT3757MPMSE#TRPBF offers guaranteed –55°C startup and AEC-Q100 MP qualification essential for automotive powertrain. Compared with LT3758MPMSE#TRPBF, it retains external low-side MOSFET drive flexibility and SENSE-based current sensing - critical for precision current-mode control in LED and battery-charging applications.
Availability
LT3757MPMSE#TRPBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial isolated PSUs, portable medical instruments, and telecom intermediate bus converters requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT3757MPMSE#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 power management ICs, serving automotive, industrial, communications, and healthcare markets with precision, reliability, and longevity.
The LT3757 product line delivers high-voltage, current-mode DC/DC controllers optimized for rugged, wide-input applications - especially automotive power conversion where extended temperature, low quiescent current, and AEC-Q100 compliance are mandatory.
FAQ
What is the operating temperature range of the LT3757MPMSE#TRPBF?
The LT3757MPMSE#TRPBF is 100% tested and guaranteed over –55°C to +150°C junction temperature, meeting AEC-Q100 Grade MP requirements for under-hood automotive applications. This exceeds standard industrial (–40°C to +125°C) and commercial grades, ensuring reliable startup at extreme cold and sustained operation in high-ambient thermal environments.
How does the LT3757MPMSE#TRPBF support both positive and negative output voltages?
The LT3757MPMSE#TRPBF uses a dual-threshold FBX pin with ±0.8V and +1.6V reference voltages. When the external feedback divider pulls FBX toward GND, the internal –0.8V comparator activates for inverting configurations. When pulled above GND, the +1.6V comparator engages for boost/flyback/SEPIC. No external logic or mode pins are needed - polarity is determined solely by feedback network biasing.
Can the LT3757MPMSE#TRPBF synchronize to an external clock?
Yes, the LT3757MPMSE#TRPBF supports external clock synchronization via the SYNC pin. To ensure reliable locking, the RT resistor must be selected to program a free-running frequency ~20% lower than the external SYNC frequency. The SYNC input accepts digital logic-level signals with ≥200ns pulse width; tie SYNC to GND if unused.
What is the purpose of the INTVCC pin on the LT3757MPMSE#TRPBF?
The INTVCC pin on the LT3757MPMSE#TRPBF outputs a regulated 7.2V supply that powers the gate driver and internal circuitry. It features undervoltage lockout (2.7V) and overvoltage protection (17.5V) to safeguard MOSFET gate drive. A minimum 4.7µF ceramic capacitor must be placed directly between INTVCC and GND to handle high transient gate-drive currents.
Does the LT3757MPMSE#TRPBF include soft-start functionality?
Yes, the LT3757MPMSE#TRPBF implements programmable soft-start via the SS pin, which modulates the VC pin clamp voltage. An external capacitor from SS to GND sets the ramp duration. The soft-start sequence resets automatically during input UVLO, INTVCC UV/OV, or thermal shutdown - preventing inrush current and ensuring controlled startup under fault conditions.
LT3757MPMSE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3757MPMSE#TRPBF FAQ
1.How can I place an order for LT3757MPMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757MPMSE#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 LT3757MPMSE#TRPBF reliable?
The price and inventory of LT3757MPMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757MPMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3757MPMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757MPMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757MPMSE#TRPBF?
LT3757MPMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757MPMSE#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 LT3757MPMSE#TRPBF?
For technical support, including LT3757MPMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757MPMSE#TRPBF requirements.
6.How does Aetrix verify that LT3757MPMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3757MPMSE#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 LT3757MPMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3757MPMSE#TRPBF?
All LT3757MPMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757MPMSE#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 LT3757MPMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3757MPMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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