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Analog Devices Inc. LT3758AIMSE#PBF
- Part No.:
- LT3758AIMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3758AIMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,711
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Product details
Overview
LT3758AIMSE#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 delivers programmable 100kHz–1MHz switching frequency, <1µA shutdown current, and internal 7.2V LDO for gate drive - enabling high-voltage industrial power supplies and automotive battery systems.
For engineers reviewing the LT3758AIMSE#PBF datasheet, LT3758AIMSE#PBF pinout, LT3758AIMSE#PBF application, or LT3758AIMSE#PBF equivalent, key selection criteria include input voltage range (5.5V–100V), negative/positive output configurability via FBX, soft-start programmability, AEC-Q100 qualification, and MSOP-10 thermal performance (θJA = 40°C/W).
Technical Context
The LT3758AIMSE#PBF implements fixed-frequency current-mode control with slope compensation, using SENSE pin voltage plus ramp to modulate PWM duty cycle against VC error amplifier output. Its dual-reference feedback architecture supports ±1.6V/–0.8V regulation thresholds depending on output polarity configuration.
It integrates an internal 7.2V LDO (4.5V UVLO, 17.5V OVLO) powering the gate driver and logic, with INTVCC current limiting that scales inversely with VIN to prevent thermal runaway. The SHDN/UVLO pin enables precise undervoltage lockout with externally programmable hysteresis via resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to 48V telecom, 24V/48V industrial, and 12V/24V automotive battery rails without pre-regulation. |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor; enables optimization of magnetics size vs. efficiency and EMI filtering requirements. |
| SENSE Threshold | 110mV typical - defines peak switch current limit; sets maximum inductor current before foldback or shutdown. |
| FBX Regulation | +1.6V or –0.8V - selectable via external resistor divider; allows same IC to regulate positive or negative outputs without topology change. |
| Shutdown IQ | <1µA - enables long-term battery backup operation in always-on monitoring or telematics systems. |
| INTVCC LDO | 7.2V ±0.2V, 22mA max - powers gate driver and internal circuitry; bypassed with ≥4.7µF ceramic capacitor at pin. |
| Package | 10-Lead MSOP (3mm × 3mm) with exposed pad - θJA = 40°C/W; requires soldered GND pad for thermal integrity in high-power designs. |
Pinout & Package
LT3758AIMSE#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 PCB ground plane for thermal performance (θJA = 40°C/W) and current sense return path integrity.
| 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 and fault conditions. |
| FBX (Pin 2) | Positive/negative feedback input | Sets output regulation point: +1.6V for positive outputs, –0.8V for negative outputs; also triggers frequency foldback during overcurrent. |
| SS (Pin 3) | Soft-start timing input | 10µA pull-up to 2.5V rail; external capacitor sets startup ramp time; reset by UVLO, INTVCC fault, or thermal lockout. |
| RT (Pin 4) | Frequency programming input | Resistor to GND sets switching frequency (100kHz–1MHz); open-circuit disables operation. |
| SYNC (Pin 5) | External clock synchronization input | Accepts digital clock signal; requires RT setting 20% below SYNC frequency; tied to GND when unused. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to source-side of sense resistor; monitors switch current for peak-current mode control and overcurrent protection. |
| GATE (Pin 7) | N-channel MOSFET gate driver output | Drives external NFET 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; must be bypassed with ≥4.7µF ceramic cap; can be powered externally to disable LDO. |
| 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; resets soft-start on undervoltage. |
| VIN (Pin 10) | Main input supply | 5.5V–100V input; requires local 0.22µF+ ceramic bypass capacitor; powers internal LDO and provides bias for SHDN/UVLO. |
| Exposed Pad (Pin 11) | Thermal and current-sense ground | Must be soldered to PCB ground plane; serves as GND reference for SENSE, GATE, and thermal dissipation path. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | 5.5V to 100V operation eliminates need for pre-regulators in 48V telecom, 24V industrial, and 12V/24V automotive systems. |
| Single-pin polarity selection | FBX pin accepts either positive or negative feedback networks - enables one BOM for both positive and negative output designs. |
| Programmable soft-start | External capacitor on SS pin controls startup dV/dt and inrush current - prevents output overshoot and stress on downstream components. |
| AEC-Q100 qualified | Rated for –40°C to +125°C junction temperature - validated for automotive infotainment, ADAS power supplies, and body electronics. |
| Frequency synchronization | SYNC pin accepts external clock up to 1MHz - enables EMI reduction via spread-spectrum or multi-phase interleaving in dense layouts. |
Applications
| Automotive Battery Management | Industrial Telecom Power |
|---|---|
|
Use Scenario: 12V/24V vehicle battery powers isolated 5V/3.3V rails for CAN transceivers and microcontrollers during cold-crank (4.5V) and load-dump (60V+). IC Role / Device Role / Timing Role: LT3758AIMSE#PBF operates as non-isolated flyback controller regulating stable 5V output across full battery range. Use Value: 100V absolute max rating and programmable UVLO ensure continuous operation during transient battery events without brownout or latch-up. |
Use Scenario: 36V–72V telecom rectified input supplies 12V/1.2A for base station RF modules requiring tight line/load regulation. IC Role / Device Role / Timing Role: LT3758AIMSE#PBF configured as SEPIC converter maintains regulation despite wide input swing and high ripple. Use Value: Current-mode control with slope compensation delivers fast transient response to dynamic RF load steps without output droop. |
| High-Voltage Industrial Sensors | Ruggedized IoT Edge Node |
|
Use Scenario: 48V PoE++ or industrial bus powers isolated ±15V analog front-end for precision current/voltage measurement in motor drives. IC Role / Device Role / Timing Role: LT3758AIMSE#PBF used in inverting configuration to generate clean –15V rail from 48V input. Use Value: Dual-reference FBX architecture enables accurate negative regulation without additional op-amps or level-shifters. |
Use Scenario: Solar-powered remote sensor node with LiFePO₄ battery (2.5V–3.65V) requires 3.3V rail with ultra-low quiescent current during sleep. IC Role / Device Role / Timing Role: LT3758AIMSE#PBF configured as boost converter with VIN connected to battery and INTVCC bypassed to reduce IQ. Use Value: <1µA shutdown IQ extends battery life to years in intermittent wake-up applications like environmental monitoring. |
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 VIN max (150V), integrated gate drivers, no negative-output capability, fixed 100kHz–850kHz range | Better suited for high-power synchronous buck designs; lacks FBX polarity flexibility for inverting/SEPIC | Select when higher input voltage margin or synchronous rectification is required, but avoid if negative output or topology flexibility is needed. |
| MAX17596ATP+T | 60V max VIN, integrated MOSFETs, 200kHz–2.2MHz range, no AEC-Q100 grade available | Lower integration reduces BOM count but limits input range and automotive qualification | Prefer for cost-sensitive, space-constrained 24V industrial supplies where 100V rating and AEC-Q100 are unnecessary. |
Compared with LTC3895EMSE#PBF and MAX17596ATP+T, LT3758AIMSE#PBF uniquely combines 100V input tolerance, AEC-Q100 qualification, and single-pin polarity selection - making it the only option for automotive or industrial flyback/SEPIC designs requiring both wide VIN and bipolar output capability.
Availability
LT3758AIMSE#PBF is available at Aetrix Electronics and suitable for automotive battery management, industrial telecom power, high-voltage sensor supplies, and ruggedized IoT edge nodes requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3758AIMSE#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 since 1965.
The LT3758 family was designed specifically for high-reliability, wide-input DC/DC controllers in harsh environments - emphasizing robustness, configurability across topologies, and automotive-grade qualification.
FAQ
What is the operating temperature range for LT3758AIMSE#PBF?
The LT3758AIMSE#PBF is rated for –40°C to +125°C junction temperature and is AEC-Q100 qualified for automotive applications. Its MSOP-10 package features an exposed thermal pad that must be soldered to PCB ground to achieve θJA = 40°C/W and maintain reliability within this range.
Can LT3758AIMSE#PBF generate a negative output voltage?
Yes, LT3758AIMSE#PBF supports negative output generation using inverting topology. When the FBX pin is pulled to –0.8V via external resistor divider, the internal comparator A2 activates to provide noninverting amplification from FBX to VC, enabling stable regulation of negative rails such as –5V or –12V.
How do I configure LT3758AIMSE#PBF for synchronization with an external clock?
To synchronize LT3758AIMSE#PBF, apply a digital clock signal to the SYNC pin and set the RT resistor to program a frequency 20% slower than the SYNC frequency. Ensure minimum pulse width ≥200ns. If synchronization is not required, tie SYNC to GND to disable the function.
What is the purpose of the exposed pad on LT3758AIMSE#PBF?
The exposed pad (Pin 11) on LT3758AIMSE#PBF serves as both thermal conduction path and current-sense ground reference. It must be soldered directly to a large PCB copper plane to achieve θJA = 40°C/W and ensure accurate Kelvin sensing of the SENSE pin voltage.
Does LT3758AIMSE#PBF require an external bootstrap capacitor?
No, LT3758AIMSE#PBF does not require a bootstrap capacitor because it drives only a low-side N-channel MOSFET using its internal 7.2V LDO-regulated INTVCC supply. The GATE pin switches directly between INTVCC and GND, eliminating need for high-side floating bias circuitry.
LT3758AIMSE#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
LT3758AIMSE#PBF FAQ
1.How can I place an order for LT3758AIMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758AIMSE#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 LT3758AIMSE#PBF reliable?
The price and inventory of LT3758AIMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758AIMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3758AIMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758AIMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758AIMSE#PBF?
LT3758AIMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758AIMSE#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 LT3758AIMSE#PBF?
For technical support, including LT3758AIMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758AIMSE#PBF requirements.
6.How does Aetrix verify that LT3758AIMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3758AIMSE#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 LT3758AIMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3758AIMSE#PBF?
All LT3758AIMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758AIMSE#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 LT3758AIMSE#PBF part is unused and in its original packaging.
Return procedure for LT3758AIMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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