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Analog Devices Inc. LT3758AHMSE#PBF
- Part No.:
- LT3758AHMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3758AHMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:509
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Product details
Overview
LT3758AHMSE#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-pin positive/negative output voltage programming. It delivers 100kHz–1MHz programmable switching frequency, <1µA shutdown current, and AEC-Q100 qualification for automotive-grade reliability.
For engineers reviewing the LT3758AHMSE#PBF datasheet, LT3758AHMSE#PBF pinout, LT3758AHMSE#PBF application, or LT3758AHMSE#PBF equivalent, key selection criteria include input voltage range compatibility, negative/positive output configurability, thermal performance at 150°C junction, INTVCC LDO regulation stability, and soft-start/frequency foldback behavior under fault conditions.
Technical Context
The LT3758AHMSE#PBF implements fixed-frequency current-mode control with internal slope compensation, enabling stable operation across wide VIN and VOUT ranges. Its dual-reference feedback architecture (1.6V for positive outputs, –0.8V for negative outputs) allows topology-agnostic output polarity control via FBX pin voltage level.
It integrates a 7.2V low-dropout regulator (LDO) for gate drive, with undervoltage lockout (4.5V) and overvoltage protection (17.5V), plus programmable SHDN/UVLO thresholds with hysteresis. Frequency synchronization via SYNC pin supports system-level clock alignment without requiring external PLL circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - enables direct connection to 24V/48V industrial buses and 12V/24V automotive batteries without pre-regulation. |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor; higher frequencies reduce magnetics size but increase MOSFET switching losses. |
| SENSE Threshold | 110mV typical - defines peak switch current limit; determines maximum power handling with selected sense resistor. |
| FBX Regulation | +1.6V or –0.8V - selectable via external divider; enables single-feedback-pin configuration of both positive and negative outputs. |
| INTVCC Regulator | 7.2V ±0.2V - powers gate driver and internal logic; bypassed with ≥4.7µF ceramic capacitor for transient gate-current delivery. |
| Shutdown IQ | <1µA - preserves battery life in always-on automotive modules during sleep mode. |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade H; supports under-hood and high-ambient industrial environments. |
Pinout & Package
LT3758AHMSE#PBF uses a 10-lead MSOP package (3mm × 3mm) with exposed pad (Pin 11) soldered to PCB ground for thermal management and current-sense return path. θJA = 40°C/W with proper copper plane layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; sets bandwidth and phase margin of feedback control. |
| FBX (Pin 2) | Unified feedback input | Dual-reference input: >0V configures positive output (1.6V ref); <0V configures negative output (–0.8V ref). |
| SS (Pin 3) | Soft-start clamp control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO or thermal fault. |
| RT (Pin 4) | Frequency programming node | Resistor-to-GND sets oscillator frequency; open-circuit disables operation. |
| SYNC (Pin 5) | External clock input | Accepts digital clock signal; requires RT setting 20% below SYNC frequency for reliable locking. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to source-side of sense resistor; monitors peak switch current for cycle-by-cycle limiting. |
| GATE (Pin 7) | N-channel MOSFET driver output | Swings between INTVCC and GND; drives gate capacitance directly; forced low during shutdown or fault. |
| 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 and input monitoring | 1.22V falling threshold with programmable hysteresis; pulls VIN IQ below 1µA when ≤0.4V. |
| VIN (Pin 10) | Main power input | Accepts 5.5V–100V; requires local 0.22µF+ ceramic bypass capacitor adjacent to pin. |
| Exposed Pad (Pin 11) | Thermal & current-sense ground | Must be soldered to PCB ground plane; serves as GND reference for SENSE and thermal conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Supports boost, flyback, SEPIC, and inverting configurations using same IC - reduces BOM count and design reuse effort. |
| Negative Output Capability | Single FBX pin accepts –0.8V reference for inverting converters - eliminates need for separate negative-feedback IC or level-shifting circuitry. |
| Frequency Foldback | Reduces switching frequency during overload or short-circuit - limits peak inductor current and prevents thermal runaway. |
| AEC-Q100 Grade H | Qualified for –40°C to +150°C operation - meets automotive under-hood temperature requirements without derating. |
| Programmable UVLO Hysteresis | External resistor divider sets precise turn-on/turn-off thresholds - avoids brown-out oscillation in noisy battery systems. |
Applications
| Automotive Infotainment Power | Industrial Telecom PSU |
|---|---|
|
Use Scenario: Generating isolated ±12V rails from 24V vehicle battery for audio amplifiers and display controllers. IC Role / Device Role / Timing Role: Flyback controller with primary-side sensing; regulates negative output via FBX at –0.8V reference. Use Value: Eliminates secondary-side optocoupler and TL431, reducing component count and improving long-term reliability in vibration-prone environments. |
Use Scenario: Non-isolated 48V-to-12V SEPIC converter powering PoE midspans in telecom cabinets. IC Role / Device Role / Timing Role: High-voltage SEPIC controller maintaining regulation during wide 36V–72V input transients. Use Value: 100V absolute max VIN rating withstands telecom line surges; 150°C junction rating ensures stable operation in sealed enclosures. |
| Ruggedized Industrial Sensor Node | High-Voltage Test Equipment Supply |
|
Use Scenario: 12V-to-–15V inverting supply for precision ADC biasing in factory-floor pressure sensors. IC Role / Device Role / Timing Role: Inverting controller with soft-start and frequency foldback protecting against sensor cable shorts. Use Value: Sub-1µA shutdown current extends battery life in wireless edge nodes; –40°C to +150°C rating survives washdown cycles. |
Use Scenario: 100V-capable boost converter generating 200V bias for semiconductor parametric test fixtures. IC Role / Device Role / Timing Role: High-input boost controller driving discrete N-MOSFET with Kelvin SENSE for accurate current limiting. Use Value: 100V VIN rating avoids series FETs or pre-regulators; programmable 100kHz–1MHz frequency optimizes efficiency vs. EMI filter size. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3758HMSE#PBF | No A-grade load transient improvement; identical pinout, package, and temperature range (–40°C to +150°C). | Lacks enhanced load step response of LT3758A variant; suitable where fast transient recovery is not required. | Select LT3758AHMSE#PBF when output voltage stability during rapid load changes is critical (e.g., RF power amplifier biasing). |
| LT3757EMSE#PBF | Lower max VIN (40V), no AEC-Q100 qualification, –40°C to +125°C rating, same 10-lead MSOP footprint. | Restricted to non-automotive, lower-voltage industrial use; lacks negative-output capability and frequency foldback. | Choose LT3757EMSE#PBF only for cost-sensitive 24V systems where 100V tolerance and automotive qualification are unnecessary. |
Compared with LT3758HMSE#PBF, the LT3758AHMSE#PBF provides measurably improved load transient performance, while LT3757EMSE#PBF sacrifices input voltage range, qualification, and feature set for lower unit cost-making it unsuitable as a drop-in replacement in high-reliability or high-VIN designs.
Availability
LT3758AHMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial telecom power supplies, and ruggedized sensor node designs requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3758AHMSE#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 industrial, automotive, communications, and healthcare markets.
The LT3758A product line delivers high-voltage, multi-topology DC/DC controllers optimized for demanding power conversion in automotive and industrial environments where input transients, temperature extremes, and reliability are critical.
FAQ
What is the maximum input voltage supported by the LT3758AHMSE#PBF?
The LT3758AHMSE#PBF supports an absolute maximum input voltage of 100V on the VIN pin, with guaranteed operation from 5.5V to 100V. This makes it suitable for direct connection to 48V telecom systems, 24V automotive batteries, and industrial 100V bus architectures without external pre-regulation stages. The LT3758AHMSE#PBF maintains full functionality-including current-mode control, soft-start, and fault protection-across this entire range.
How does the LT3758AHMSE#PBF support both positive and negative output voltages?
The LT3758AHMSE#PBF uses a dual-reference feedback architecture: when the FBX pin voltage is above 0V, it regulates to +1.6V; when below 0V, it regulates to –0.8V. This allows the same LT3758AHMSE#PBF to configure boost, flyback, or SEPIC for positive outputs-or inverting topologies for negative outputs-using only one feedback pin and standard external resistive dividers. No additional ICs or level shifters are required.
What is the purpose of the exposed pad on the LT3758AHMSE#PBF MSOP package?
The exposed pad (Pin 11) on the LT3758AHMSE#PBF serves two critical functions: it provides the primary thermal conduction path to the PCB ground plane (θJA = 40°C/W), and it acts as the Kelvin return path for the SENSE pin current measurement. To ensure reliable operation, the exposed pad must be fully soldered to a solid copper ground plane-failure to do so degrades thermal performance and compromises current-sense accuracy in the LT3758AHMSE#PBF.
Can the LT3758AHMSE#PBF synchronize its switching frequency to an external clock?
Yes, the LT3758AHMSE#PBF supports external clock synchronization via the SYNC pin. When a digital clock signal is applied, the LT3758AHMSE#PBF locks to that frequency-provided the RT resistor is selected to program a free-running frequency ~20% slower than the SYNC signal. This feature enables EMI reduction through spread-spectrum alignment and system-level timing coordination without modifying the LT3758AHMSE#PBF's internal oscillator.
What distinguishes the LT3758AHMSE#PBF from the standard LT3758HMSE#PBF?
The LT3758AHMSE#PBF features improved load transient response compared to the LT3758HMSE#PBF, as confirmed in the datasheet's "LT3758A has improved load transient performance" statement. Both share identical pinout, package, temperature range (–40°C to +150°C), and AEC-Q100 qualification-but the 'A' variant delivers tighter output voltage regulation during rapid load steps, making it preferred for RF biasing, precision analog supplies, and other dynamic-load applications where the LT3758AHMSE#PBF's enhanced control loop stability matters.
LT3758AHMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3758AHMSE#PBF FAQ
1.How can I place an order for LT3758AHMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758AHMSE#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 LT3758AHMSE#PBF reliable?
The price and inventory of LT3758AHMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758AHMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3758AHMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758AHMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758AHMSE#PBF?
LT3758AHMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758AHMSE#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 LT3758AHMSE#PBF?
For technical support, including LT3758AHMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758AHMSE#PBF requirements.
6.How does Aetrix verify that LT3758AHMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3758AHMSE#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 LT3758AHMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3758AHMSE#PBF?
All LT3758AHMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758AHMSE#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 LT3758AHMSE#PBF part is unused and in its original packaging.
Return procedure for LT3758AHMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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