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Analog Devices Inc. LT3757AEMSE#WTRPBF
- Part No.:
- LT3757AEMSE#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757AEMSE#WTRPBF.pdf
- Description:
- BOOST, FLY, SEPIC & INV CNTR
- Quantity:
- Payment:
- Shipping:
Inventory:3,180
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Product details
Overview
LT3757AEMSE#WTRPBF from Analog Devices is a wide-input, current-mode DC/DC controller for boost, flyback, SEPIC, and inverting topologies, driving external N-channel MOSFETs with an internal 7.2V LDO gate supply. It supports 2.9V–40V input, programmable 50kHz–1MHz switching frequency via RT resistor, and delivers ±0.8% feedback regulation (1.6V positive / –0.8V negative) for precision output voltage control in automotive power supplies.
For engineers reviewing the LT3757AEMSE#WTRPBF datasheet, LT3757AEMSE#WTRPBF pinout, LT3757AEMSE#WTRPBF application, or LT3757AEMSE#WTRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 10-pin MSOP package with exposed thermal pad, soft-start and frequency foldback for fault robustness, and dual-mode feedback enabling single-pin polarity selection - all critical for battery-powered and automotive-grade converter designs.
Technical Context
The LT3757AEMSE#WTRPBF implements fixed-frequency current-mode control with slope compensation, where peak inductor current is regulated by comparing sensed switch current (via SENSE pin) against a VC-set threshold. Its error amplifier (A1/A2) selects between 1.6V or –0.8V reference based on FBX voltage polarity, enabling seamless positive- or negative-output configuration without external logic.
Internal protection includes INTVCC UV/OV lockout (2.7V/17.5V), FBX overvoltage detection (±8–11% hysteresis), thermal shutdown at 165°C, and programmable SHDN/UVLO with 1.22V falling threshold and user-defined hysteresis. The SYNC pin allows external clock synchronization when RT is set to 20% lower than sync frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 40V - enables direct operation from 3.3V logic rails up to 36V automotive batteries without pre-regulation. |
| Switching Frequency | 50kHz to 1MHz (RT-programmable) - balances efficiency (lower f) vs. size (higher f); minimum on/off time = 220ns limits max frequency at low duty cycles. |
| Feedback Regulation | 1.6V (positive) or –0.8V (negative), ±0.8% accuracy - permits precise output voltage setting across polarity modes using standard resistor dividers. |
| SENSE Threshold | 110mV (typical), ±10mV over temp - sets current limit with minimal sensing loss; Kelvin connection required for accuracy. |
| INTVCC Regulator | 7.2V LDO, 95mA max, 400mV dropout at 20mA - powers gate driver and internal circuitry; bypassed with ≥4.7µF ceramic capacitor. |
| Shutdown Current | <1µA - preserves battery life in always-on automotive modules during sleep mode. |
| AEC-Q100 Grade | Grade E (–40°C to +125°C junction) - qualified for under-hood and infotainment power systems per automotive reliability standards. |
Pinout & Package
LT3757AEMSE#WTRPBF uses 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 numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (1) | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; clamped during soft-start and fault conditions. |
| FBX (2) | Positive/negative feedback input | Dual-mode reference selection: >0V → 1.6V regulation; <0V → –0.8V regulation; also triggers frequency foldback near GND. |
| SS (3) | Soft-start timing control | 10µA internal pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO, INTVCC faults, or thermal shutdown. |
| RT (4) | Frequency programming input | Resistor to GND sets oscillator frequency (50kHz–1MHz); open-circuit disables operation. |
| SYNC (5) | External clock synchronization input | Accepts digital clock signal; requires RT set to 20% lower frequency; ignored when FBX ≈ GND. |
| SENSE (6) | Current sense amplifier input | Kelvin-connected to high-side of sense resistor; monitors switch current for peak-current limiting and PWM control. |
| GATE (7) | N-MOSFET gate driver output | Swings between INTVCC and GND; forced low during shutdown, thermal fault, 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; can be externally powered above 7.5V. |
| SHDN/UVLO (9) | Enable/disable and input UVLO control | 1.22V falling threshold with programmable hysteresis; pulls VIN IQ below 1µA when ≤0.4V. |
| VIN (10) | Main input supply | 2.9V–40V input; requires local 0.22µF+ ceramic bypass; powers internal LDO and bias circuits. |
| Exposed Pad (11) | Thermal ground and current sense return | Mandatory solder connection to PCB ground plane; serves as SENSE pin's low-side reference and primary heat path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity feedback architecture | Single FBX pin supports both 1.6V (positive VOUT) and –0.8V (negative VOUT) regulation - eliminates need for external polarity-select logic or dual-reference ICs. |
| Programmable soft-start with fault reset | SS pin capacitor sets controlled output ramp; automatically resets on INTVCC UV/OV, thermal lockout, or SHDN/UVLO undervoltage - prevents inrush damage during recovery. |
| Frequency foldback during overload | Reduces switching frequency when FBX approaches GND during short-circuit or startup - limits peak inductor current without external circuitry. |
| Integrated INTVCC protection | 2.7V UVLO and 17.5V OVLO on INTVCC rail force GATE low and trigger soft-start - safeguards MOSFET gate drive integrity under supply anomalies. |
| AEC-Q100 qualified MSOP package | 10-lead MSOP with exposed pad rated for –40°C to +125°C operation - meets automotive thermal and vibration requirements without derating. |
Applications
| Automotive LED Headlamp Driver | Industrial Isolated Flyback Supply |
|---|---|
|
Use Scenario: Driving high-brightness LEDs from 12V vehicle battery with dimming and fault reporting. IC Role / Device Role / Timing Role: Boost controller regulating constant current via SENSE feedback; FBX configured for positive output; SYNC used to align switching with ECU clock. Use Value: AEC-Q100 qualification ensures reliability in under-hood environments; 2.9V start-up supports cold-cranking; frequency foldback protects LEDs during short-circuit events. |
Use Scenario: Generating isolated 24V/1A output from 24–48V industrial bus for PLC I/O modules. IC Role / Device Role / Timing Role: Flyback controller with optocoupler feedback to FBX; INTVCC powered from auxiliary winding; RT set to 300kHz for compact transformer design. Use Value: Dual feedback reference enables stable regulation despite optocoupler CTR variation; 40V absolute max VIN tolerates bus transients; exposed pad ensures thermal stability at full load. |
| Portable Medical Instrument Power | Telecom Bias Supply for RF Amplifiers |
|
Use Scenario: Generating ±15V rails from single-cell Li-ion (2.7–4.2V) for analog front-end amplifiers. IC Role / Device Role / Timing Role: Inverting controller (FBX pulled negative) for –15V; boost stage for +15V; SS pin coordinated for sequenced startup. Use Value: Sub-3V start-up enables operation down to depleted battery; <1µA shutdown current extends runtime; 10-pin MSOP minimizes board area in handheld enclosures. |
Use Scenario: Providing 28V bias to GaN RF power amplifiers in 5G base station remote radio units. IC Role / Device Role / Timing Role: Boost controller with external MOSFET; SYNC locked to system clock to reduce EMI; INTVCC powered from 28V output via diode. Use Value: 40V VIN rating handles telecom surge standards; programmable frequency avoids sensitive RF bands; 7.2V INTVCC ensures robust gate drive for high-speed GaN switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757EMSE#TRPBF | Non-AEC-Q100 version; identical electrical specs but rated only for –40°C to +125°C commercial temp range without automotive qualification testing. | Suitable for industrial or consumer boost/flyback where automotive reliability certification is not required. | Select LT3757EMSE#TRPBF for cost-sensitive non-automotive designs needing same functionality without AEC-Q100 documentation burden. |
| LT3758AEMSE#WTRPBF | Includes integrated 1.2A MOSFET driver with higher peak current (1.2A vs. LT3757A's gate driver capability); otherwise identical topology support and pinout. | Better suited for driving larger MOSFETs at high frequency without external driver; same footprint and control features. | Choose LT3758AEMSE#WTRPBF when gate charge exceeds ~50nC or switching frequency exceeds 600kHz with large FETs. |
Compared with LT3757EMSE#TRPBF, the LT3757AEMSE#WTRPBF adds AEC-Q100 compliance and improved load transient response; versus LT3758AEMSE#WTRPBF, it lacks the integrated high-current driver but offers identical control architecture and smaller die size for lower-cost, lower-power applications.
Availability
LT3757AEMSE#WTRPBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial isolated flyback supplies, portable medical instrument power, and telecom RF bias supplies requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LT3757AEMSE#WTRPBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3757A series belongs to Analog Devices' Power by Linear™ portfolio of high-voltage DC/DC controllers, designed specifically for rugged, wide-input, multi-topology power conversion in automotive and industrial environments where reliability and precision regulation are critical.
FAQ
What is the key difference between LT3757AEMSE#WTRPBF and the base LT3757?
The LT3757AEMSE#WTRPBF features improved load transient response compared to the original LT3757, particularly during rapid output current changes. It retains identical pinout, electrical specifications, and functional architecture - including 2.9V–40V input range, 50kHz–1MHz RT-programmable frequency, and dual-polarity FBX feedback - but delivers tighter regulation under dynamic load conditions, making it preferred for automotive and high-reliability applications where output stability is critical. The LT3757AEMSE#WTRPBF also carries the #W suffix indicating AEC-Q100 qualification.
Can LT3757AEMSE#WTRPBF be used in a SEPIC converter, and what is required for proper operation?
Yes, LT3757AEMSE#WTRPBF supports SEPIC topology by configuring the FBX pin to the positive reference (1.6V) using a resistor divider from VOUT to GND. The IC's internal comparator A1 then performs inverting amplification to regulate output voltage. Critical requirements include Kelvin connection of the SENSE pin to the MOSFET source-side sense resistor, proper RT resistor selection for desired frequency (e.g., 41.2kΩ for 300kHz), and mandatory 4.7µF ceramic bypass on INTVCC. The LT3757AEMSE#WTRPBF's current-mode control ensures stable operation across wide input/output voltage ratios typical of SEPIC designs.
How does the SHDN/UVLO pin function, and can it be used for input undervoltage lockout?
The SHDN/UVLO pin on LT3757AEMSE#WTRPBF provides both enable/disable control and programmable input undervoltage lockout. With a 1.22V nominal falling threshold and user-defined hysteresis via external resistors, it accurately determines turn-on and turn-off points of the input supply. When VIN drops below the programmed falling threshold, the IC shuts down and reduces quiescent current to <1µA. This dual function eliminates the need for external UVLO comparators in battery-powered or automotive systems, and the LT3757AEMSE#WTRPBF's specification guarantees reliable operation across –40°C to +125°C ambient.
What thermal considerations apply to the LT3757AEMSE#WTRPBF in continuous operation?
The LT3757AEMSE#WTRPBF uses a 10-lead MSOP package with exposed thermal pad (Pin 11), achieving θJA = 40°C/W when properly soldered to a full PCB ground plane. At 125°C max junction temperature and 70°C ambient, maximum allowable power dissipation is ~1.28W. Since most power is consumed driving the external MOSFET gate (IDRIVE = f × QG), designers must select MOSFETs with appropriate QG for target frequency and VIN - e.g., at 40V input and 500kHz, QG should remain below ~100nC to avoid INTVCC droop. The LT3757AEMSE#WTRPBF includes internal INTVCC current limiting to prevent thermal runaway.
Is LT3757AEMSE#WTRPBF compatible with external clock synchronization, and what are the constraints?
Yes, LT3757AEMSE#WTRPBF supports external clock synchronization via the SYNC pin, accepting digital clock signals with ≥200ns pulse width. To ensure reliable locking, the RT resistor must be selected to program a free-running frequency 20% slower than the SYNC frequency - for example, use RT = 24.3kΩ (500kHz) when synchronizing to a 625kHz clock. The SYNC feature is disabled if the pin is tied to GND, and it is automatically ignored when FBX voltage is near GND (e.g., during startup or fault conditions). This capability enables EMI reduction and system-level timing coordination in noise-sensitive applications.
LT3757AEMSE#WTRPBF 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3757AEMSE#WTRPBF FAQ
1.How can I place an order for LT3757AEMSE#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757AEMSE#WTRPBF 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 LT3757AEMSE#WTRPBF reliable?
The price and inventory of LT3757AEMSE#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757AEMSE#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT3757AEMSE#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757AEMSE#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757AEMSE#WTRPBF?
LT3757AEMSE#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757AEMSE#WTRPBF 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 LT3757AEMSE#WTRPBF?
For technical support, including LT3757AEMSE#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757AEMSE#WTRPBF requirements.
6.How does Aetrix verify that LT3757AEMSE#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT3757AEMSE#WTRPBF 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 LT3757AEMSE#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT3757AEMSE#WTRPBF?
All LT3757AEMSE#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757AEMSE#WTRPBF, 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 LT3757AEMSE#WTRPBF part is unused and in its original packaging.
Return procedure for LT3757AEMSE#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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