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Analog Devices Inc. LT3758EMSE#TRPBF
- Part No.:
- LT3758EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3758EMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,816
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Product details
Overview
LT3758EMSE#TRPBF from Analog Devices is a wide-input (5.5V–100V), 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 programmable frequency (100kHz–1MHz), single-pin positive/negative output voltage programming via FBX, and features <1µA shutdown current. Used in automotive 12V–48V telecom power supplies.
For engineers reviewing the LT3758EMSE#TRPBF datasheet, LT3758EMSE#TRPBF pinout, LT3758EMSE#TRPBF application, or LT3758EMSE#TRPBF equivalent, key selection factors include input voltage range compatibility, FBX polarity handling, INTVCC drive capability at high VIN, soft-start timing control, and AEC-Q100 qualification for automotive use.
Technical Context
The LT3758EMSE#TRPBF implements fixed-frequency current-mode control with slope compensation, using SENSE voltage plus ramp to compare against VC error amplifier output for PWM duty cycle generation. Its dual-reference FBX architecture (1.6V for positive outputs, –0.8V for negative) enables topology-agnostic feedback without external polarity switching circuitry.
It integrates a 7.2V LDO regulator (INTVCC) with UVLO (4.5V) and OVLO (17.5V) protection, programmable SHDN/UVLO threshold (1.22V nominal falling), and frequency foldback during overcurrent. The RT pin sets oscillator frequency via resistor; SYNC allows external clock synchronization with 20% slower RT programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to 48V telecom, 72V industrial, or 100V battery systems without pre-regulation. |
| FBX Regulation Voltage | +1.6V or –0.8V - enables single-pin configuration of both positive and negative output converters without external level-shifting. |
| SENSE Threshold | 110mV (typ) - sets peak switch current limit; determines maximum inductor current before cycle-by-cycle shutdown. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor; higher frequencies reduce magnetics size but increase gate drive loss. |
| Shutdown IQ | <1µA - enables long-term battery backup operation in automotive telematics or remote sensors. |
| INTVCC Regulator | 7.2V ±0.2V - powers gate driver and internal logic; bypassed with ≥4.7µF ceramic capacitor near pin 8. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 Grade E. |
Pinout & Package
LT3758EMSE#TRPBF uses a 10-lead plastic MSOP package (3mm × 3mm) with exposed thermal pad (Pin 11 = GND). The package has θJA = 40°C/W and requires soldering of the exposed pad to PCB ground plane for thermal performance.
| 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 | Sets output regulation point: 1.6V for positive VOUT, –0.8V for negative VOUT; also triggers frequency foldback during faults. |
| SS (3) | Soft-start timing control | 10µA pull-up to 2.5V rail; external capacitor sets startup ramp time; reset by UVLO or thermal lockout. |
| RT (4) | Oscillator frequency programming | Resistor to GND sets switching frequency (100kHz–1MHz); open-circuit disables operation. |
| SYNC (5) | External clock synchronization input | Digital input accepting 1.5V–8V logic; forces switching at external clock rate when active; tie to GND if unused. |
| SENSE (6) | Current sense amplifier input | Kelvin-connected to high-side of current-sense resistor; monitors switch current for cycle-by-cycle limiting. |
| GATE (7) | N-channel MOSFET gate driver output | Swings between INTVCC and GND; drives external FET; forced low during shutdown or INTVCC fault. |
| INTVCC (8) | Internal 7.2V LDO output | Powers gate driver and internal circuitry; must be bypassed with ≥4.7µF ceramic cap; can be externally powered above 7.5V. |
| SHDN/UVLO (9) | Enable/disable and input undervoltage detection | 1.22V falling threshold with programmable hysteresis; pulls VIN IQ below 1µA when ≤0.4V. |
| VIN (10) | Main input supply | Accepts 5.5V–100V; requires local 0.22µF+ ceramic bypass; powers internal LDO and bias circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | 5.5V–100V operation eliminates need for pre-regulators in 48V telecom or 72V industrial bus designs. |
| Single FBX pin polarity selection | Eliminates external op-amp or diode networks for bipolar output configurations-reduces BOM count and layout complexity. |
| Programmable soft-start | Capacitor-controlled ramp prevents inrush current and output overshoot during cold start in battery-powered systems. |
| Frequency synchronization | Enables noise-sensitive applications (e.g., automotive infotainment) to avoid beat frequencies by locking to system clock. |
| AEC-Q100 qualification | Validated for automotive under-hood environments including temperature cycling, HTOL, and ESD testing per Grade E requirements. |
Applications
| Automotive Infotainment Power | Industrial Telecom Rectifier |
|---|---|
Use Scenario: 24V–72V vehicle battery input powering 5V/3.3V logic rails and 12V display backlight in head unit. IC Role / Device Role / Timing Role: Flyback controller generating isolated 12V output with synchronous rectification support. Use Value: 100V absolute max rating tolerates load-dump transients; AEC-Q100 qualification ensures reliability in vibration-prone environments. | Use Scenario: 48V telecom central office rectifier supplying 3.3V/5V for line cards and management processors. IC Role / Device Role / Timing Role: Boost controller delivering regulated 12V intermediate bus from 36V–72V input range. Use Value: Programmable 100kHz–1MHz frequency allows optimization for efficiency (low f) or compact magnetics (high f) per card density requirement. |
| Isolated Medical Sensor Supply | Ruggedized Industrial I/O Module |
Use Scenario: Battery-backed portable diagnostic device requiring isolated ±5V analog supply from 9V primary cell. IC Role / Device Role / Timing Role: Inverting controller generating –5V rail with tight regulation and low EMI. Use Value: FBX dual-reference (–0.8V) enables precise negative output without extra components; <1µA shutdown IQ extends battery life. | Use Scenario: DIN-rail mounted PLC I/O module operating from 24VDC industrial bus with surge immunity. IC Role / Device Role / Timing Role: SEPIC controller providing non-inverting 5V output tolerant to input dips down to 5.5V. Use Value: Input undervoltage lockout with hysteresis prevents brownout oscillation during motor startup surges on shared 24V bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3758AEMSE#TRPBF | Improved load transient response; identical pinout, specs, and package; same temp grade (–40°C to +125°C). | Better dynamic regulation in fast-changing loads like servo drivers or digital signal processors. | Select LT3758AEMSE#TRPBF when output voltage stability under rapid load steps is critical. |
| LM5165QPWPRQ1 | Lower VIN max (65V), integrated 500mA FET, fixed 2.1MHz frequency, no FBX polarity switching. | Limited to lower-voltage industrial or automotive body electronics; no negative output capability. | Choose LM5165QPWPRQ1 only for cost-sensitive, space-constrained 24V–48V applications where topology flexibility is not required. |
Compared with LT3758EMSE#TRPBF, LT3758AEMSE#TRPBF offers superior transient recovery without layout or BOM changes, while LM5165QPWPRQ1 trades topology versatility and voltage range for integration and fixed-frequency simplicity-making it suitable only for narrower input and unipolar output use cases.
Availability
LT3758EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial telecom rectifiers, and ruggedized I/O modules requiring stable component supply across extended temperature and high-reliability environments.
Supply support for LT3758EMSE#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 LT3758 product line delivers high-voltage, multi-topology DC/DC controllers optimized for harsh-environment power conversion in automotive, telecom, and industrial systems where input transients, wide VIN range, and topology flexibility are critical.
FAQ
What is the maximum input voltage rating for LT3758EMSE#TRPBF?
The LT3758EMSE#TRPBF has an absolute maximum input voltage rating of 100V on the VIN pin. This allows direct operation from 48V telecom buses, 72V industrial systems, and automotive 12V/24V platforms with load-dump protection. Operation above 100V risks permanent damage. The LT3758EMSE#TRPBF maintains full functionality across its specified 5.5V–100V operating range, with internal protection circuits ensuring safe startup and fault recovery within this window.
How does the FBX pin support both positive and negative output configurations in LT3758EMSE#TRPBF?
The LT3758EMSE#TRPBF uses a dual-reference FBX architecture: it regulates to +1.6V for positive-output topologies (boost, flyback, SEPIC) and to –0.8V for negative-output inverting configurations. The internal comparators automatically select the appropriate reference based on FBX voltage polarity, eliminating external level-shifting circuitry. This behavior is intrinsic to the LT3758EMSE#TRPBF silicon design and requires no mode-select pins or configuration registers.
Can LT3758EMSE#TRPBF synchronize to an external clock, and what are the constraints?
Yes, the LT3758EMSE#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% slower than the external SYNC frequency. The SYNC signal must be a clean digital waveform (1.5V–8V logic levels) with minimum pulse width ≥200ns. If synchronization is not needed, the SYNC pin must be tied to GND-leaving it floating may cause erratic operation of the LT3758EMSE#TRPBF.
What thermal considerations apply to LT3758EMSE#TRPBF in high-frequency, high-VIN operation?
In high-frequency (>500kHz) or high-VIN (>60V) applications, LT3758EMSE#TRPBF gate drive power dissipation increases significantly. With its MSOP package (θJA = 40°C/W), proper thermal design-including soldering the exposed pad to a large copper plane-is essential. The internal INTVCC current limit decreases with rising VIN; exceeding it causes INTVCC collapse and soft-start retriggering. Users must verify QG × f × VIN stays within the INTVCC output capability curve shown in the LT3758EMSE#TRPBF datasheet Figure 2.
Is LT3758EMSE#TRPBF qualified for automotive applications, and what does that entail?
Yes, LT3758EMSE#TRPBF is AEC-Q100 qualified for automotive applications (Grade E, –40°C to +125°C). This qualification includes stress testing for temperature cycling, high-temperature operating life (HTOL), electrostatic discharge (HBM/MM/CDM), and mechanical shock/vibration. It confirms the LT3758EMSE#TRPBF meets reliability and failure-rate requirements for under-hood and cabin electronics, though it is not an ASIL-rated functional safety component.
LT3758EMSE#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 or Negative, Isolation Capable
- Topology:
- Boost, Flyback, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 5.5V ~ 100V
- 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
LT3758EMSE#TRPBF FAQ
1.How can I place an order for LT3758EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758EMSE#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 LT3758EMSE#TRPBF reliable?
The price and inventory of LT3758EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3758EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758EMSE#TRPBF?
LT3758EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758EMSE#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 LT3758EMSE#TRPBF?
For technical support, including LT3758EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3758EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3758EMSE#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 LT3758EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3758EMSE#TRPBF?
All LT3758EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758EMSE#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 LT3758EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3758EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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