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Analog Devices Inc. LT3758AMPMSE#PBF
- Part No.:
- LT3758AMPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3758AMPMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,133
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Product details
Overview
LT3758AMPMSE#PBF from Analog Devices is a wide-input, current-mode DC/DC controller for boost, flyback, SEPIC, and inverting topologies, supporting 5.5V to 100V input and generating positive or negative regulated outputs. It drives an external N-channel MOSFET with an internal 7.2V LDO, features programmable 100kHz–1MHz switching frequency via RT pin, and delivers <1µA shutdown current. Used in automotive power supplies requiring AEC-Q100 compliance and extended temperature operation.
For engineers reviewing the LT3758AMPMSE#PBF datasheet, LT3758AMPMSE#PBF pinout, LT3758AMPMSE#PBF application, or LT3758AMPMSE#PBF equivalent, key selection criteria include its –55°C to 150°C operating junction range, dual feedback voltage references (1.6V/–0.8V), SENSE threshold of 110mV (typ), frequency synchronization capability, and MSOP-10 package with exposed thermal pad.
Technical Context
The LT3758AMPMSE#PBF implements fixed-frequency current-mode control with slope compensation, enabling stable regulation across wide VIN and VOUT ranges. Its error amplifier supports both positive (1.6V) and negative (–0.8V) FBX reference modes, and frequency foldback limits inductor current during overloads.
It integrates a 7.2V low-dropout regulator (INTVCC) with UVLO (4.5V) and OVLO (17.5V), programmable SHDN/UVLO thresholds with hysteresis, soft-start via SS pin, and SYNC pin for external clock synchronization - all while maintaining <1µA shutdown IQ and 220ns minimum on/off times.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 100V - supports direct connection to 24V/48V industrial buses and 12V/24V automotive batteries with transient tolerance. |
| Feedback Reference Voltages | +1.6V and –0.8V - enables single-pin programming of both positive and negative output configurations without external logic. |
| SENSE Threshold | 110mV (typ) - sets peak switch current limit with ±10mV variation over temperature; determines maximum deliverable output power per topology. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor; higher frequencies reduce magnetics size but increase gate drive losses. |
| Shutdown Quiescent Current | <1µA - enables long-term battery backup in always-on automotive or telecom systems without significant drain. |
| Operating Junction Temperature | –55°C to 150°C - fully tested and guaranteed; supports under-hood automotive, industrial control, and high-reliability power conversion. |
| Package | 10-Lead MSOP with exposed pad - provides θJA = 40°C/W thermal resistance when soldered to PCB ground plane. |
Pinout & Package
LT3758AMPMSE#PBF uses a 10-lead plastic MSOP package (3mm × 3mm) with exposed thermal pad (Pin 11 = GND). The exposed pad must be soldered directly to the PCB ground plane for thermal and electrical integrity.
| 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: regulates to +1.6V for positive outputs or –0.8V for negative outputs; modulates frequency during faults. |
| SS (Pin 3) | Soft-start control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO, INTVCC fault, or thermal lockout. |
| RT (Pin 4) | Frequency programming | Resistor-to-GND sets switching frequency (100kHz–1MHz); open-circuit disables operation. |
| SYNC (Pin 5) | External clock input | Accepts digital clock signal; requires RT setting 20% below SYNC frequency; tied to GND if unused. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to source-side of sense resistor; compares against 110mV threshold to terminate switch conduction. |
| GATE (Pin 7) | N-MOSFET gate driver output | Swings 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; bypassed with ≥4.7µF ceramic cap; can be externally powered to disable LDO. |
| SHDN/UVLO (Pin 9) | Enable and input UV detection | 1.22V falling threshold with programmable hysteresis; pulls down 2µA to set rising threshold; <0.4V disables IC. |
| VIN (Pin 10) | Main input supply | Accepts 5.5V–100V; requires local 0.22µF+ ceramic bypass; powers internal LDO and bias circuits. |
| Exposed Pad (Pin 11) | Thermal & electrical ground | Must be soldered to PCB ground plane; serves as GND return and current-sense resistor negative terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage support | Operates from 5.5V to 100V - eliminates need for pre-regulators in 24V/48V industrial and 12V/24V automotive systems. |
| Dual-polarity feedback architecture | Single FBX pin supports both +1.6V and –0.8V regulation - simplifies design of bipolar supplies without extra comparators or level shifters. |
| Programmable frequency with sync | RT resistor sets 100kHz–1MHz range; SYNC pin enables deterministic timing alignment across multiple converters in noise-sensitive systems. |
| Low-power shutdown mode | <1µA VIN quiescent current - extends battery life in always-on telematics, ADAS sensors, and remote monitoring devices. |
| AEC-Q100 qualified grade | MP-grade variant rated –55°C to 150°C with 100% testing - meets automotive under-hood and industrial high-temperature reliability requirements. |
Applications
| Automotive Front-End Power Supply | Industrial Telecom Power Module |
|---|---|
Use Scenario: 12V/24V battery-fed power supply for infotainment head units, requiring isolated 5V/3.3V rails and EMI-compliant operation. IC Role / Device Role / Timing Role: Flyback controller driving external N-MOSFET; regulates output using optocoupler feedback referenced to secondary ground. Use Value: 100V absolute max rating withstands load-dump transients; programmable UVLO prevents brownout resets; AEC-Q100 MP grade ensures reliability at 150°C junction. | Use Scenario: 48V telecom rectifier output converted to 12V intermediate bus for downstream POL converters in base station equipment. IC Role / Device Role / Timing Role: Boost controller with synchronous rectification; operates at 300kHz to balance efficiency and magnetics size. Use Value: 110mV SENSE threshold enables precise current limiting; INTVCC LDO bypass option reduces power loss; MSOP-10 footprint fits dense board layouts. |
| High-Voltage Industrial Sensor Interface | Isolated Inverter Gate Driver Supply |
Use Scenario: Field-powered sensor node in factory automation, deriving regulated ±15V from 24–72V DC bus for analog front-end and isolation amplifiers. IC Role / Device Role / Timing Role: SEPIC controller delivering non-inverting output; uses FBX = +1.6V reference and external divider for tight regulation. Use Value: Wide VIN range accommodates fluctuating plant bus voltages; frequency foldback protects during short-circuit events; soft-start prevents inrush stress on input capacitors. | Use Scenario: Isolated negative bias supply for IGBT gate drivers in motor drives, requiring –15V rail with fast transient response. IC Role / Device Role / Timing Role: Inverting controller with FBX = –0.8V reference; generates regulated negative output referenced to power ground. Use Value: Dual-reference architecture eliminates need for external inverting op-amps; 220ns min on-time supports high-frequency PWM modulation; exposed pad ensures thermal stability under continuous load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EMSE#PBF | Wider VIN (4V–140V), integrated gate drivers, no negative FBX mode, lower IQ (25µA active) | Designed for high-efficiency synchronous buck; lacks native inverting/SEPIC/flyback support | Select for buck-only designs needing higher input voltage margin and integrated drivers. |
| LT3757EMSE#PBF | Same topology support, but only –40°C to 125°C grade, no AEC-Q100 qualification, 105mV SENSE threshold | Cost-optimized for commercial/industrial use; not suitable for automotive under-hood deployment | Select for non-automotive applications where extended temperature and qualification are unnecessary. |
Compared with LTC3891EMSE#PBF and LT3757EMSE#PBF, LT3758AMPMSE#PBF uniquely combines AEC-Q100 MP-grade reliability, dual-polarity feedback, and 100V input capability - making it the only choice for automotive flyback/SEPIC supplies requiring guaranteed –55°C startup and 150°C operation.
Availability
LT3758AMPMSE#PBF is available at Aetrix Electronics and suitable for automotive front-end power supplies, industrial telecom modules, high-voltage sensor interfaces, and isolated inverter gate driver supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT3758AMPMSE#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, communications, and automotive markets.
The LT3758/LT3758A product line delivers high-voltage, multi-topology DC/DC controllers optimized for rugged, wide-input applications including automotive power conversion, telecom infrastructure, and industrial power supplies.
FAQ
What is the guaranteed operating temperature range for LT3758AMPMSE#PBF?
The LT3758AMPMSE#PBF is 100% tested and guaranteed over –55°C to 150°C junction temperature. This MP-grade variant includes full characterization across the range, unlike standard grades that are only assured by design correlation. Its MSOP-10 package with exposed pad achieves θJA = 40°C/W when properly soldered, enabling reliable operation in automotive under-hood and industrial high-temperature environments where the LT3758AMPMSE#PBF is deployed.
How does LT3758AMPMSE#PBF support both positive and negative output voltages?
The LT3758AMPMSE#PBF uses a dual-reference feedback architecture: FBX regulates to +1.6V for boost/flyback/SEPIC configurations and to –0.8V for inverting topologies. The internal error amplifiers (A1 and A2) auto-select based on FBX voltage polarity - no external components or configuration pins are needed. This allows a single LT3758AMPMSE#PBF design to generate either polarity output, reducing BOM count and layout complexity compared to controllers requiring separate reference networks.
Can LT3758AMPMSE#PBF synchronize to an external clock, and what are the constraints?
Yes, LT3758AMPMSE#PBF supports 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 with ≥200ns minimum pulse width. If synchronization is unused, SYNC must be tied to GND - leaving it floating may cause erratic operation. This capability enables deterministic switching in multi-rail systems to minimize beat frequencies and EMI peaks, a key requirement in the LT3758AMPMSE#PBF's target applications.
What is the purpose of the exposed thermal pad on LT3758AMPMSE#PBF, and how must it be handled?
The exposed pad (Pin 11) on LT3758AMPMSE#PBF serves as both thermal dissipation path and electrical GND return - it is internally connected to the die substrate and current-sense resistor ground. It must be soldered directly to a solid PCB copper plane with ≥4 thermal vias to internal ground layers. Failure to do so degrades θJA from 40°C/W to >60°C/W, risking thermal shutdown or reduced lifetime. This thermal design requirement is critical for LT3758AMPMSE#PBF operation at 150°C junction temperature in automotive and industrial deployments.
How does LT3758AMPMSE#PBF implement undervoltage lockout for input supply monitoring?
The LT3758AMPMSE#PBF uses the SHDN/UVLO pin with a precise 1.22V falling threshold and programmable hysteresis. An internal 2µA pull-down current source interacts with an external resistor divider (R3/R4) to set distinct turn-on and turn-off voltages: VIN,FALLING = 1.22 × (R3+R4)/R4 and VIN,RISING = 2µA × R3 + VIN,FALLING. This enables accurate brownout protection without additional comparators. During UVLO, soft-start resets and GATE is forced low - ensuring controlled restart in the LT3758AMPMSE#PBF's automotive and industrial power systems.
LT3758AMPMSE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3758AMPMSE#PBF FAQ
1.How can I place an order for LT3758AMPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758AMPMSE#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 LT3758AMPMSE#PBF reliable?
The price and inventory of LT3758AMPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758AMPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3758AMPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758AMPMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758AMPMSE#PBF?
LT3758AMPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758AMPMSE#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 LT3758AMPMSE#PBF?
For technical support, including LT3758AMPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758AMPMSE#PBF requirements.
6.How does Aetrix verify that LT3758AMPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3758AMPMSE#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 LT3758AMPMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3758AMPMSE#PBF?
All LT3758AMPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758AMPMSE#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 LT3758AMPMSE#PBF part is unused and in its original packaging.
Return procedure for LT3758AMPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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