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Analog Devices Inc. LT3758HMSE#PBF
- Part No.:
- LT3758HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3758HMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,364
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Product details
Overview
LT3758HMSE#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 a 7.2V internal LDO, features programmable 100kHz–1MHz switching frequency, <1µA shutdown current, and AEC-Q100 qualification for automotive power systems.
For engineers reviewing the LT3758HMSE#PBF datasheet, LT3758HMSE#PBF pinout, LT3758HMSE#PBF application, or LT3758HMSE#PBF equivalent, this page delivers verified functional identity, thermal-rated package mapping (MSOP-10, –40°C to 150°C), confirmed pin roles, and two validated alternative controllers with documented technical and application differences.
Technical Context
The LT3758HMSE#PBF implements fixed-frequency current-mode control with slope compensation, enabling stable regulation across wide VIN and VOUT ranges. Its dual feedback reference (1.6V for positive output, –0.8V for negative output) allows single-pin output polarity selection without external logic.
It integrates a 7.2V low-dropout regulator (LDO) for gate drive, with UVLO (4.5V) and OVLO (17.5V) protection on INTVCC, plus programmable input UVLO via SHDN/UVLO pin using a 2µA internal pull-down current source. Frequency foldback and soft-start limit inductor current during startup and short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to 24V/48V industrial buses and 12V/24V automotive batteries with transient headroom. |
| 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; sets maximum MOSFET conduction time per cycle. |
| FBX Regulation | +1.6V or –0.8V - selectable via external divider; enables single-pin configuration of positive/negative output voltage. |
| Shutdown IQ | <1µA - ensures minimal battery drain in always-on automotive modules during sleep mode. |
| INTVCC LDO | 7.2V ±0.2V - powers gate driver and internal circuitry; bypassed with ≥4.7µF ceramic capacitor at pin. |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade H; supports under-hood automotive placement. |
Pinout & Package
LT3758HMSE#PBF uses a 10-lead plastic MSOP package (3mm × 3mm) with exposed pad (Pin 11 = GND), rated for –40°C to +150°C operation. Thermal resistance θJA = 40°C/W with proper PCB copper pour under exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; clamped during soft-start. |
| FBX (Pin 2) | Positive/negative feedback input | Sets output voltage via resistor divider; selects +1.6V or –0.8V reference based on polarity configuration. |
| SS (Pin 3) | Soft-start timing control | 10µA internal pull-up charges external capacitor; resets on UVLO or thermal fault. |
| RT (Pin 4) | Frequency programming input | Resistor to GND sets switching frequency; open-circuit disables operation. |
| SYNC (Pin 5) | External clock synchronization input | Accepts digital clock signal; requires RT setting 20% below SYNC frequency. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to MOSFET source-side sense resistor; triggers immediate turn-off above 110mV. |
| GATE (Pin 7) | N-channel MOSFET gate driver output | Swings between INTVCC and GND; forced low during shutdown or INTVCC fault. |
| INTVCC (Pin 8) | Internal 7.2V LDO output | Powers gate driver and logic; must be bypassed with ≥4.7µF ceramic cap; can be externally powered above 7.5V. |
| SHDN/UVLO (Pin 9) | Enable/disable and input UVLO input | 1.22V falling threshold with programmable hysteresis; pulls VIN IQ below 1µA when ≤0.4V. |
| VIN (Pin 10) | Main input supply | Accepts 5.5V–100V; requires local 0.22µF+ ceramic bypass capacitor. |
| Exposed Pad (Pin 11) | Thermal ground / SENSE return | Must be soldered to PCB ground plane; serves as Kelvin return for SENSE path. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VIN range (5.5V–100V) | Eliminates need for pre-regulator in 24V/48V telecom or 12V/24V automotive systems with load dump transients. |
| Single FBX pin for ±VOUT | Reduces BOM count and layout complexity versus dual-reference controllers; no external polarity-select logic required. |
| Programmable frequency (100kHz–1MHz) | Enables optimization of magnetic size vs. efficiency; supports EMI spread-spectrum tuning via RT resistor selection. |
| AEC-Q100 Grade H (–40°C to +150°C) | Validated for under-hood automotive applications including engine control units and ADAS power supplies. |
| Frequency foldback during overcurrent | Prevents inductor saturation and MOSFET overstress during startup or output short-circuit without external circuitry. |
Applications
| Automotive Engine Control Unit (ECU) Power Supply | Industrial 48V Telecom Rectifier |
|---|---|
|
Use Scenario: Generating isolated 5V/3.3V rails from 12V vehicle battery with load dump immunity up to 100V. IC Role / Device Role / Timing Role: Flyback controller regulating secondary-side output while monitoring primary current via SENSE pin. Use Value: AEC-Q100 Grade H rating ensures reliability at 150°C junction temperature; <1µA shutdown IQ extends battery life during vehicle sleep mode. |
Use Scenario: Non-isolated SEPIC converter stepping 36–72V telecom input down to 24V for downstream DC-DC stages. IC Role / Device Role / Timing Role: Current-mode controller managing duty cycle and frequency foldback during line transients. Use Value: 100V absolute max VIN withstands surge events; programmable UVLO prevents brownout restarts during AC line sag. |
| Railway Signaling Power Module | High-Voltage Industrial Sensor Interface |
|
Use Scenario: Boost converter generating +48V from 24V nominal rail for trackside communication equipment. IC Role / Device Role / Timing Role: High-efficiency boost controller with soft-start limiting inrush into large output capacitors. Use Value: 7.2V INTVCC LDO drives high-Qg MOSFETs directly; exposed pad ensures thermal stability at 70°C ambient with full load. |
Use Scenario: Inverting buck-boost supplying –15V to precision analog front-end sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Negative-output controller using FBX referenced to –0.8V, with SENSE-based current limiting. Use Value: Dual feedback reference eliminates need for external op-amp inverting stage; reduces component count and board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3895EMSE#PBF | Wider VIN (4.5V–150V), integrated gate drivers, no internal LDO; requires external bias supply. | Targeted at high-current synchronous buck designs; lacks native flyback/SEPIC support and negative output capability. | Choose LTC3895 for >20A synchronous buck with ultra-high VIN; avoid if needing inverting topology or internal LDO simplicity. |
| LT3757EMSE#PBF | Same pinout and core architecture but lower temp grade (–40°C to 125°C); no AEC-Q100 qualification. | Valid for industrial/commercial use only; not approved for automotive under-hood deployment. | Choose LT3757EMSE for cost-sensitive non-automotive designs where 125°C max junction suffices. |
Compared with LT3758HMSE#PBF, LTC3895EMSE#PBF offers higher VIN tolerance but demands external bias and lacks polarity flexibility, while LT3757EMSE#PBF shares identical functionality but omits automotive qualification and high-temp robustness - making LT3758HMSE#PBF the sole choice for AEC-Q100-compliant, 150°C-capable flyback/SEPIC/inverting power conversion.
Availability
LT3758HMSE#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial 48V telecom rectifiers, railway signaling power modules, and high-voltage sensor interfaces requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3758HMSE#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 with precision power and signal chain solutions.
The LT3758 product line delivers high-voltage, current-mode DC/DC controllers optimized for rugged, wide-input applications including automotive subsystems, telecom infrastructure, and industrial power conversion where reliability across extreme temperature and voltage conditions is critical.
FAQ
What is the maximum operating junction temperature for LT3758HMSE#PBF?
The LT3758HMSE#PBF is rated for a maximum junction temperature of +150°C and is AEC-Q100 qualified for Grade H automotive applications. This specification is guaranteed over the full –40°C to +150°C operating junction temperature range, with thermal resistance θJA = 40°C/W when the exposed pad is properly soldered to a PCB ground plane.
Can LT3758HMSE#PBF generate both positive and negative output voltages?
Yes, the LT3758HMSE#PBF supports both polarities using a single FBX pin: it regulates to +1.6V for positive outputs (e.g., boost, flyback, SEPIC) and to –0.8V for negative outputs (e.g., inverting topology). The selection is determined solely by the external resistor divider configuration - no additional pins or external logic are required.
How is the switching frequency programmed on LT3758HMSE#PBF?
The switching frequency of LT3758HMSE#PBF is set by connecting a resistor from the RT pin (Pin 4) to GND. Values range from 10.5kΩ (1MHz) to 140kΩ (100kHz), with intermediate values specified in the datasheet's RT table. Leaving RT open disables operation; the IC does not function without this resistor.
Does LT3758HMSE#PBF include built-in protection features?
Yes, LT3758HMSE#PBF integrates multiple protections: input UVLO with programmable hysteresis (via SHDN/UVLO), INTVCC UVLO (4.5V) and OVLO (17.5V), cycle-by-cycle current limiting (110mV SENSE threshold), frequency foldback during overcurrent, thermal shutdown, and soft-start with automatic reset on fault conditions.
Is LT3758HMSE#PBF pin-compatible with other variants in the LT3758 family?
Yes, all LT3758 and LT3758A variants in the MSOP-10 package - including LT3758EMSE#PBF, LT3758IMSE#PBF, and LT3758AHMSE#PBF - share identical pinout, electrical behavior, and footprint. Only temperature grade, AEC-Q100 qualification, and minor performance enhancements (e.g., LT3758A's improved transient response) differ between variants.
LT3758HMSE#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
LT3758HMSE#PBF FAQ
1.How can I place an order for LT3758HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758HMSE#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 LT3758HMSE#PBF reliable?
The price and inventory of LT3758HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3758HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758HMSE#PBF?
LT3758HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758HMSE#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 LT3758HMSE#PBF?
For technical support, including LT3758HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758HMSE#PBF requirements.
6.How does Aetrix verify that LT3758HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3758HMSE#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 LT3758HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3758HMSE#PBF?
All LT3758HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758HMSE#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 LT3758HMSE#PBF part is unused and in its original packaging.
Return procedure for LT3758HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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