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Analog Devices Inc. LT3757HMSE#TRPBF
- Part No.:
- LT3757HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757HMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,276
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Product details
Overview
LT3757HMSE#TRPBF from Analog Devices is a wide-input current-mode DC/DC controller for boost, flyback, SEPIC, and inverting topologies, supporting 2.9V–40V input, programmable 50kHz–1MHz switching frequency, and ±1µA shutdown current. It drives external N-channel MOSFETs with an internal 7.2V LDO, features AEC-Q100 qualification for automotive use, and operates up to 150°C junction temperature.
For engineers reviewing the LT3757HMSE#TRPBF datasheet, LT3757HMSE#TRPBF pinout, LT3757HMSE#TRPBF application, or LT3757HMSE#TRPBF equivalent, key selection criteria include its dual-polarity feedback capability (1.6V positive / –0.8V negative FBX regulation), soft-start programmability, SYNC pin synchronization, and thermal robustness in MSOP-10 package with exposed pad.
Technical Context
The LT3757HMSE#TRPBF implements fixed-frequency current-mode control with slope compensation, using SENSE voltage plus ramp sum fed into PWM comparator to regulate peak switch current. Its error amplifier supports dual reference modes-1.6V for positive output configurations and –0.8V for inverting operation-selected automatically by FBX voltage polarity.
It integrates an internal 7.2V LDO (INTVCC) with UVLO (2.7V) and OVLO (17.5V) protection, programmable SHDN/UVLO threshold with hysteresis, and frequency foldback during overcurrent. The VC pin provides direct access to the error amplifier output for loop compensation, while RT sets oscillator frequency via resistor-to-ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 40V - enables direct operation from 3.3V logic rails, 12V/24V automotive systems, and wide-range industrial supplies. |
| Switching Frequency | 50kHz to 1MHz - set by RT resistor; allows trade-off between efficiency (lower f) and magnetics size (higher f). |
| FBX Regulation Voltage | +1.6V or –0.8V - single-pin dual-polarity feedback eliminates need for separate positive/negative sensing networks. |
| SENSE Threshold | 110mV (typ) - defines current limit at sense resistor; enables precise overcurrent protection with low-loss sensing. |
| Shutdown Current | <1µA - critical for battery-powered systems requiring ultra-low quiescent power in standby mode. |
| Operating Junction Temp | –40°C to +150°C - qualified per AEC-Q100 Grade H; supports under-hood automotive and high-temp industrial environments. |
| INTVCC Regulator | 7.2V LDO with 2.7V UVLO and 17.5V OVLO - powers gate driver and internal circuitry; bypass requires ≥4.7µF ceramic capacitor. |
Pinout & Package
LT3757HMSE#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 functions are validated per Analog Devices Rev. H datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output | Direct access to compensation node; RC network here stabilizes voltage loop and sets phase margin. |
| FBX (Pin 2) | Feedback input | Accepts either positive (1.6V-regulated) or negative (–0.8V-regulated) feedback; auto-selects reference based on voltage polarity. |
| SS (Pin 3) | Soft-start control | Clamps VC during startup; external capacitor sets ramp time; reset by UV/OV/thermal faults. |
| RT (Pin 4) | Oscillator timing | Resistor-to-GND sets switching frequency; open-circuit disables operation. |
| SYNC (Pin 5) | External clock sync | Accepts digital clock signal; IC locks to SYNC frequency if RT is set 20% slower than SYNC rate. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to MOSFET source-side sense resistor; compares against 110mV threshold for cycle-by-cycle current limiting. |
| GATE (Pin 7) | MOSFET driver output | Drives N-channel gate between INTVCC and GND; forced 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 cap near pin. |
| SHDN/UVLO (Pin 9) | Enable & input monitoring | 1.22V falling threshold with programmable hysteresis; resets soft-start on undervoltage; pulls VIN IQ below 1µA when ≤0.4V. |
| 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 both +1.6V (boost/flyback/SEPIC) and –0.8V (inverting) regulation without external reconfiguration. |
| Programmable frequency with SYNC | RT resistor sets 50kHz–1MHz range; SYNC pin enables deterministic phase alignment across multiple converters in system-level designs. |
| Thermal and supply protection | Integrated INTVCC UVLO (2.7V), OVLO (17.5V), and thermal shutdown (>165°C); all trigger GATE disable and soft-start reset. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation; meets automotive reliability requirements including HTOL, TC, and ESD testing. |
| Low-IQ shutdown mode | <1µA VIN current when SHDN/UVLO ≤0.4V - extends battery life in always-on vehicle modules and portable diagnostics equipment. |
Applications
| Automotive LED Headlamp Driver | Industrial Isolated Flyback PSU |
|---|---|
Use Scenario: High-brightness LED arrays in modern headlamps require tightly regulated constant-current output with fast transient response to dimming commands. IC Role / Device Role / Timing Role: LT3757HMSE#TRPBF operates in boost configuration, regulating LED current via SENSE feedback while maintaining stable 24V–48V input compatibility across vehicle battery conditions. Use Value: 110mV current-sense threshold enables accurate current control with low Rsense, minimizing power loss; AEC-Q100 qualification ensures reliability in under-hood thermal environments. | Use Scenario: Factory automation PLCs require isolated 5V/12V auxiliary supplies from unregulated 24V DC bus, with immunity to line transients and long-term stability. IC Role / Device Role / Timing Role: LT3757HMSE#TRPBF configured as flyback controller delivers galvanically isolated output with primary-side sensing, eliminating optocoupler complexity. Use Value: Programmable soft-start prevents transformer saturation at power-up; 150°C max junction rating supports operation inside sealed enclosures with limited airflow. |
| Portable Medical Battery Charger | Telecom DC-DC Intermediate Bus Converter |
Use Scenario: Portable ultrasound or patient monitors use Li-ion batteries (2.9V–4.2V) and require efficient step-up to 12V/15V for analog front-end and display subsystems. IC Role / Device Role / Timing Role: LT3757HMSE#TRPBF operates in boost mode with minimum 2.9V start-up, enabling full battery discharge down to end-of-life voltage. Use Value: Sub-1µA shutdown current preserves battery charge during device sleep; internal 7.2V LDO powers gate driver without external bias supply. | Use Scenario: 48V telecom rectifiers feed intermediate bus converters delivering 12V/5V to baseband processing cards, demanding high efficiency and EMI control. IC Role / Device Role / Timing Role: LT3757HMSE#TRPBF used in SEPIC topology accepts wide 36V–72V input range and delivers regulated 12V output with inherent input-output isolation. Use Value: SYNC pin enables spread-spectrum or multi-phase interleaving to reduce conducted EMI; 1MHz max frequency allows compact magnetics for 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 |
|---|---|---|---|
| LT3757AEMSE#TRPBF | Same pinout and function; improved load transient response and tighter FBX regulation tolerance (±0.8% vs ±1.0%). | Better suited for high-dynamic-load applications like CPU VRMs or servo drive aux supplies where output voltage deviation must be minimized. | Select LT3757AEMSE#TRPBF when faster transient recovery and tighter output regulation are required; not drop-in due to different temp grade (125°C vs 150°C). |
| UCC28C43DR | Fixed 100kHz frequency, no SYNC, no dual-polarity FBX, lower max input (28V), no AEC-Q100 qualification. | Limited to cost-sensitive industrial boost/flyback where automotive qualification and wide input are unnecessary. | Choose UCC28C43DR only for non-automotive, fixed-frequency designs with <28V input and relaxed thermal requirements. |
Compared with LT3757AEMSE#TRPBF, the LT3757HMSE#TRPBF trades minor transient performance for guaranteed 150°C operation and automotive qualification; versus UCC28C43DR, it offers wider input, programmable frequency, dual-polarity feedback, and AEC-Q100 compliance-making it suitable for mission-critical automotive and industrial power conversion where reliability and flexibility are mandatory.
Availability
LT3757HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial flyback PSUs, portable medical chargers, and telecom intermediate bus converters requiring stable component supply across extended temperature ranges.
Supply support for LT3757HMSE#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 digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LT3757 product line delivers high-voltage, current-mode DC/DC controllers optimized for rugged, wide-input, multi-topology power conversion in automotive, industrial, and telecom infrastructure applications.
FAQ
What is the maximum operating junction temperature for LT3757HMSE#TRPBF?
The LT3757HMSE#TRPBF is rated for continuous operation up to +150°C junction temperature and is AEC-Q100 qualified for automotive Grade H. This specification is validated across the full –40°C to +150°C ambient range, with thermal derating applied above 125°C to ensure long-term reliability. The MSOP-10 package's exposed pad must be soldered to a thermal pad on the PCB to achieve θJA = 40°C/W.
Can LT3757HMSE#TRPBF generate both positive and negative output voltages?
Yes, the LT3757HMSE#TRPBF supports both polarities using a single FBX pin: it regulates to +1.6V for boost, flyback, and SEPIC configurations (positive output), and to –0.8V for inverting converter topologies (negative output). The internal comparators auto-detect FBX voltage polarity and select the appropriate reference, eliminating external reconfiguration components.
How is the switching frequency programmed on LT3757HMSE#TRPBF?
The switching frequency of LT3757HMSE#TRPBF is set by connecting a resistor from the RT pin (Pin 4) to ground. Values range from 10.5kΩ (1MHz) to 442kΩ (50kHz), per the manufacturer's RT vs. frequency table. Leaving RT open disables operation. For synchronization, the RT resistor must be selected to program a frequency 20% slower than the external SYNC clock.
Does LT3757HMSE#TRPBF require an external gate driver?
No, the LT3757HMSE#TRPBF integrates a robust gate driver on Pin 7 (GATE) capable of directly driving N-channel MOSFETs. It sources/sinks sufficient current for typical gate charges (QG) at frequencies up to 1MHz, provided INTVCC remains ≥4.5V. For very high QG FETs or >500kHz operation, verify INTVCC stability using the QG vs. VIN plot in the datasheet.
What protection features are built into LT3757HMSE#TRPBF?
The LT3757HMSE#TRPBF includes cycle-by-cycle current limiting (via SENSE pin), programmable soft-start, frequency foldback during overload, INTVCC UVLO (2.7V) and OVLO (17.5V), thermal shutdown (>165°C), and FBX overvoltage lockout (±8–11% of regulated reference). All protections force GATE low and reset soft-start, ensuring safe recovery without latch-up.
LT3757HMSE#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:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3757HMSE#TRPBF FAQ
1.How can I place an order for LT3757HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757HMSE#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 LT3757HMSE#TRPBF reliable?
The price and inventory of LT3757HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3757HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757HMSE#TRPBF?
LT3757HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757HMSE#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 LT3757HMSE#TRPBF?
For technical support, including LT3757HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757HMSE#TRPBF requirements.
6.How does Aetrix verify that LT3757HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3757HMSE#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 LT3757HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3757HMSE#TRPBF?
All LT3757HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757HMSE#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 LT3757HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3757HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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