My Inquiry
My Account
Analog Devices Inc. LT3758IMSE#PBF
- Part No.:
- LT3758IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3758IMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:907
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3758IMSE#PBF from Analog Devices is a wide-input (5.5V–100V), current-mode DC/DC controller supporting boost, flyback, SEPIC, and inverting topologies with single-feedback-pin polarity selection. It drives external N-channel MOSFETs, features 100kHz–1MHz programmable switching frequency via RT resistor, 110mV typical SENSE current limit threshold, and operates across –40°C to 125°C junction temperature. Used in automotive 12V–72V input flyback supplies delivering regulated 12V/1.2A output.
For engineers reviewing the LT3758IMSE#PBF datasheet, LT3758IMSE#PBF pinout, LT3758IMSE#PBF application, or LT3758IMSE#PBF equivalent, key selection considerations include its 10-lead MSOP package with exposed pad, dual-polarity feedback capability (1.6V positive / –0.8V negative regulation), internal 7.2V LDO for gate drive, <1µA shutdown current, and AEC-Q100 qualification for automotive systems requiring robust undervoltage lockout and soft-start control.
Technical Context
The LT3758IMSE#PBF implements fixed-frequency current-mode control with slope compensation, where the SENSE pin monitors switch current through an external shunt and compares it against a 110mV threshold to terminate each on-cycle. Its error amplifier uses FBX as a bidirectional reference-1.6V for positive outputs, –0.8V for negative outputs-with transconductance of 230µS and VC output impedance of 5MΩ.
Frequency programming is achieved via RT pin resistor (e.g., 41.2kΩ sets 300kHz), while SYNC enables external clock synchronization with 20% slower RT-programmed base frequency. The internal 7.2V LDO powers the gate driver and logic; INTVCC undervoltage lockout triggers at 4.5V (0.5V hysteresis), and overvoltage protection activates at 17.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to automotive battery, telecom -48V, or industrial 24–72V rails without pre-regulation. |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor; enables trade-off between efficiency (lower f) and magnetics size (higher f). |
| SENSE Threshold | 110mV (typ) - defines peak switch current limit; determines maximum power handling with given sense resistor value. |
| FBX Regulation | +1.6V or –0.8V - single pin supports both positive and negative output configurations without external op-amps. |
| Shutdown IQ | <1µA - enables long-term battery backup operation in always-on automotive modules or remote sensors. |
| INTVCC LDO | 7.2V ±0.2V - powers gate driver and internal circuitry; bypassed with ≥4.7µF ceramic capacitor near pin. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 Grade I. |
Pinout & Package
LT3758IMSE#PBF is housed in a 10-lead plastic MSOP package (3mm × 3mm) with exposed thermal pad (Pin 11) soldered to PCB ground for θJA = 40°C/W. The package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (1) | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; clamped during soft-start. |
| FBX (2) | Bidirectional feedback input | Sets output regulation point: +1.6V for positive VOUT, –0.8V for negative VOUT; also enables frequency foldback during faults. |
| SS (3) | Soft-start timing control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO or thermal fault. |
| RT (4) | Frequency programming input | Resistor to GND sets oscillator frequency; open-circuit disables operation. |
| SYNC (5) | External clock synchronization | Accepts digital clock signal; requires RT setting 20% below SYNC frequency for reliable locking. |
| SENSE (6) | Current sense comparator input | Kelvin-connected to high-side of sense resistor; compares against 110mV threshold for cycle-by-cycle current limiting. |
| GATE (7) | N-MOSFET gate driver output | Swings between INTVCC and GND; actively pulled low during shutdown or fault conditions. |
| INTVCC (8) | Internal LDO output | 7.2V regulated supply for gate driver and logic; must be bypassed with ≥4.7µF ceramic capacitor. |
| SHDN/UVLO (9) | Enable and input UV detection | 1.22V falling threshold with programmable hysteresis; <0.4V forces shutdown and reduces IQ to <1µA. |
| VIN (10) | Main input supply | Accepts 5.5V–100V; locally bypassed with ≥0.22µF ceramic capacitor. |
| Exposed Pad (11) | Thermal ground / SENSE return | Must be soldered to PCB ground plane; serves as Kelvin return for SENSE resistor and primary thermal path. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VIN range (5.5V–100V) | Eliminates need for input pre-regulators in automotive, telecom, and industrial 24–72V systems. |
| Dual-polarity FBX regulation (+1.6V / –0.8V) | Enables single-controller design for both positive and negative output converters without external level-shifting circuitry. |
| Programmable 100kHz–1MHz switching | Allows optimization of magnetic size vs. efficiency; supports EMI spread-spectrum techniques via SYNC pin. |
| Internal 7.2V LDO with UV/OV protection | Provides stable gate drive independent of VIN; automatic shutdown if INTVCC drops below 4.5V or exceeds 17.5V. |
| AEC-Q100 Grade I qualification | Validated for automotive under-hood use with guaranteed operation from –40°C to +125°C junction temperature. |
Applications
| Automotive Infotainment Power Supply | Industrial Telecom Interface Module |
|---|---|
Use Scenario: Generating isolated 12V/1.2A from 36–72V truck battery for head unit display and audio amplifiers. IC Role / Device Role / Timing Role: Flyback controller regulating output via optocoupler feedback to FBX pin; synchronizes to system clock via SYNC pin for EMI reduction. Use Value: Eliminates need for separate positive/negative controllers; 110mV SENSE threshold ensures precise current limiting during cold-crank transients down to 5.5V VIN. | Use Scenario: Providing –48V bias for telecom line interface cards in central office equipment with 48V backplane input. IC Role / Device Role / Timing Role: Inverting controller using FBX referenced to –0.8V; configured with soft-start (SS capacitor) to prevent inrush into capacitive loads. Use Value: Single IC replaces discrete inverter + regulator; <1µA shutdown IQ preserves standby power budget during maintenance mode. |
| Wide-Input Industrial Sensor Hub | High-Voltage Test Equipment Bias Supply |
Use Scenario: Powering 3.3V/5V microcontroller and analog front-end from unregulated 12–60V factory floor supply with brownout immunity. IC Role / Device Role / Timing Role: SEPIC controller maintaining regulation during input dips; SHDN/UVLO pin programmed for 15V turn-on/12V turn-off hysteresis. Use Value: Maintains operation during motor startup surges; programmable UVLO prevents erratic resets during intermittent supply faults. | Use Scenario: Generating +100V/10mA bias for photomultiplier tubes in portable test gear powered from 24V battery pack. IC Role / Device Role / Timing Role: Boost controller with RT set to 200kHz for compact magnetics; INTVCC bypassed with 10µF X7R to handle high dI/dt gate drive pulses. Use Value: Internal 7.2V LDO eliminates need for external gate driver supply; exposed pad ensures thermal stability at 100V output with 125°C ambient. |
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 |
|---|---|---|---|
| LTC3895EMSE#PBF | Higher minimum VIN (4.5V), lower max VIN (60V); integrated gate drivers for dual-phase operation; no negative-output support. | Best suited for dual-output synchronous buck designs up to 60V input; lacks flyback/inverting topology flexibility. | Select when needing dual-phase control and higher integration, but not for >60V or negative-output applications. |
| LM5165QPWPRQ1 | Lower VIN range (3V–65V); integrated 150mA LDO; no SENSE pin - uses DCR sensing; no SYNC or programmable frequency. | Targeted at low-power buck regulators in automotive body electronics; lacks high-voltage isolation capability and topology versatility. | Choose for cost-sensitive, low-current buck-only designs where simplicity outweighs flexibility. |
Compared with LTC3895EMSE#PBF and LM5165QPWPRQ1, LT3758IMSE#PBF uniquely supports 100V input, flyback/inverting topologies, and bidirectional FBX regulation - making it irreplaceable for high-voltage isolated or negative-output designs where those functions are mandatory.
Availability
LT3758IMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial telecom interface modules, and wide-input sensor hubs requiring stable component supply with full AEC-Q100 compliance and long-term lifecycle assurance.
Supply support for LT3758IMSE#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, automotive, and communications markets.
The LT3758 product line delivers high-voltage, multi-topology DC/DC controllers designed specifically for demanding automotive and industrial power conversion where input transients, wide voltage ranges, and reliability under extreme temperature are critical.
FAQ
What is the maximum input voltage rating for LT3758IMSE#PBF?
The absolute maximum input voltage (VIN) for LT3758IMSE#PBF is 100V, with guaranteed operation across the full 5.5V to 100V range. This allows direct connection to automotive battery systems including 24V, 48V, and 72V architectures without pre-regulation. Exceeding 100V risks permanent damage per Absolute Maximum Ratings.
Can LT3758IMSE#PBF generate both positive and negative output voltages?
Yes, LT3758IMSE#PBF supports both polarities using the same FBX pin: +1.6V reference for positive outputs (boost/flyback/SEPIC) and –0.8V reference for negative outputs (inverting configuration). No external op-amps or level shifters are required - the internal comparators A1 and A2 auto-select based on FBX voltage polarity.
How is the switching frequency set on LT3758IMSE#PBF?
Switching frequency is set by connecting a resistor from the RT pin (Pin 4) to GND. Values range from 10.5kΩ (1MHz) to 140kΩ (100kHz), with 41.2kΩ yielding 300kHz. The RT pin must never be left floating - doing so disables oscillator operation. For synchronization, the RT resistor should be selected for 20% lower frequency than the external SYNC clock.
What thermal management is required for LT3758IMSE#PBF in high-power applications?
LT3758IMSE#PBF uses a 10-lead MSOP with exposed thermal pad (Pin 11) that must be soldered to a solid PCB ground plane. With proper layout, θJA is 40°C/W. At 70°C ambient and 125°C max junction temperature, maximum allowable power dissipation is ~1.28W. Use ≥4.7µF ceramic capacitor on INTVCC and minimize gate drive loop inductance to reduce thermal stress.
Is LT3758IMSE#PBF qualified for automotive applications?
Yes, LT3758IMSE#PBF is AEC-Q100 qualified for Grade I (–40°C to +125°C junction temperature) and intended for automotive under-hood and infotainment power systems. It includes built-in protections such as programmable UVLO, thermal shutdown, INTVCC UV/OV lockout, and frequency foldback during overcurrent - all validated per automotive reliability standards.
LT3758IMSE#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 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
LT3758IMSE#PBF FAQ
1.How can I place an order for LT3758IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758IMSE#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 LT3758IMSE#PBF reliable?
The price and inventory of LT3758IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3758IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758IMSE#PBF?
LT3758IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758IMSE#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 LT3758IMSE#PBF?
For technical support, including LT3758IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758IMSE#PBF requirements.
6.How does Aetrix verify that LT3758IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3758IMSE#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 LT3758IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3758IMSE#PBF?
All LT3758IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758IMSE#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 LT3758IMSE#PBF part is unused and in its original packaging.
Return procedure for LT3758IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3758IMSE#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
