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Analog Devices Inc. LT3758AEMSE#PBF
- Part No.:
- LT3758AEMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3758AEMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:796
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Product details
Overview
LT3758AEMSE#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 100kHz–1MHz programmable switching frequency, <1µA shutdown current, and integrated 7.2V LDO for gate drive - enabling high-reliability 12V telecom power supplies and automotive infotainment voltage rails.
For engineers reviewing the LT3758AEMSE#PBF datasheet, LT3758AEMSE#PBF pinout, LT3758AEMSE#PBF application, or LT3758AEMSE#PBF equivalent, key selection criteria include input UVLO hysteresis programming, FBX dual-reference operation (±0.8V/1.6V), SENSE threshold accuracy (110mV typ), INTVCC dropout behavior at VIN = 6V, and thermal derating for MSE-package θJA = 40°C/W.
Technical Context
The LT3758AEMSE#PBF implements fixed-frequency current-mode control with slope compensation, where SENSE voltage plus ramp is compared to VC to determine MOSFET on-time. Its dual-reference error amplifier (1.6V for positive outputs, –0.8V for negative) enables topology-agnostic feedback without external op-amps.
Frequency is set via RT resistor (10.5kΩ–140kΩ) or synchronized externally via SYNC pin with 20% slower internal setting; soft-start is capacitor-programmed at SS pin with 10µA pull-up; SHDN/UVLO uses 1.22V internal reference and 2µA hysteresis current source for precise input voltage turn-on/turn-off thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to 48V telecom or 72V automotive battery systems without pre-regulation. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor; enables trade-off between efficiency (lower f) and magnetics size (higher f). |
| SENSE Threshold | 110mV (typ) - sets peak switch current limit; stable over temperature (±5mV drift from –40°C to 125°C). |
| FBX Reference | +1.6V or –0.8V - selectable by output polarity; eliminates need for external inverting amplifiers in negative-output designs. |
| INTVCC Regulator | 7.2V ±0.2V LDO - powers gate driver; dropout ≤500mV at 10mA allows operation down to VIN = 6V. |
| Shutdown IQ | <1µA - enables multi-year battery life in always-on vehicle subsystems or remote sensors. |
| Package | 10-Lead MSOP (3mm × 3mm) with exposed pad - θJA = 40°C/W; requires soldered GND pad for thermal integrity. |
Pinout & Package
LT3758AEMSE#PBF is housed in a 10-lead plastic MSOP package (3mm × 3mm) with exposed thermal pad (Pin 11) that must be soldered to PCB ground for thermal performance (θJA = 40°C/W). The package is RoHS-compliant and rated for –40°C to +125°C operating junction temperature.
| 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 | Accepts resistor-divider voltage from output; selects 1.6V (positive VOUT) or –0.8V (negative VOUT) reference internally. |
| SS (Pin 3) | Soft-start timing control | 10µA pull-up to 2.5V rail; external capacitor sets startup ramp time; reset by UVLO or thermal lockout. |
| RT (Pin 4) | Frequency programming input | Resistor-to-GND sets switching frequency; open-circuit disables operation; 10.5kΩ–140kΩ range covers 1MHz–100kHz. |
| SYNC (Pin 5) | External clock synchronization | Accepts digital clock signal; forces operation at SYNC frequency when active; tie to GND if unused. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to high-side of current-sense resistor; ±0.3V absolute max; 110mV threshold triggers immediate MOSFET turn-off. |
| GATE (Pin 7) | N-channel MOSFET gate driver | Swings from INTVCC to GND; driven low during shutdown, thermal fault, or INTVCC UV/OV; 22ns rise/20ns fall (CL = 3.3nF). |
| INTVCC (Pin 8) | Internal LDO output | 7.2V regulated supply for logic and gate driver; bypass with ≥4.7µF ceramic cap; can be disabled by connecting to external ≥7.5V source. |
| SHDN/UVLO (Pin 9) | Enable/disable and input UV detection | 1.22V falling threshold with programmable hysteresis; 0.4V logic-low disables IC and reduces VIN IQ to <1µA. |
| VIN (Pin 10) | Main input supply | 5.5V–100V input; bypass with ≥0.22µF ceramic cap near pin; powers internal LDO and bias circuits. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Must be soldered to PCB GND plane; serves as return path for SENSE current and primary thermal conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, flyback, SEPIC, and inverting configurations via FBX reference selection and external component arrangement. |
| Load Transient Performance | LT3758A variant improves load step response vs. LT3758 due to enhanced error amplifier bandwidth and compensation stability. |
| Programmable UVLO Hysteresis | 2µA internal pull-down current enables precise rising/falling thresholds using two external resistors - critical for battery-powered brownout recovery. |
| Frequency Foldback | Automatically reduces switching frequency during overload or short-circuit to limit peak inductor current and prevent thermal runaway. |
| AEC-Q100 Qualified | LT3758AEMSE#PBF meets AEC-Q100 Grade 1 (–40°C to +125°C) requirements - validated for automotive powertrain and body electronics. |
Applications
| Automotive Infotainment Power | Industrial 48V Telecom Supply |
|---|---|
|
Use Scenario: Generating isolated 12V/1.2A for LCD displays and audio amplifiers in vehicles with 9V–16V nominal battery but up to 100V load-dump transients. IC Role / Device Role / Timing Role: Flyback controller with primary-side regulation; uses FBX = –0.8V reference for negative auxiliary bias and frequency foldback during cold-crank events. Use Value: Eliminates need for external transient suppressors by accepting 100V input directly; <1µA shutdown IQ extends battery standby time beyond 5 years. |
Use Scenario: Non-isolated 24V output from 36V–72V telecom rectified bus in base station power modules. IC Role / Device Role / Timing Role: Boost controller with RT = 41.2kΩ for 300kHz operation; SENSE monitors MOSFET current; INTVCC powered from VIN to reduce LDO losses. Use Value: Achieves >92% efficiency at full load while maintaining thermal margin (TJ < 115°C) with θJA = 40°C/W and 4.7µF INTVCC bypass. |
| Medical Portable Equipment | Railway Signaling Interface |
|
Use Scenario: Generating –15V/0.5A bias for analog front-end op-amps in battery-operated ultrasound devices requiring ultra-low noise and EMI. IC Role / Device Role / Timing Role: Inverting controller with FBX pulled to –0.8V; SS capacitor sets 10ms soft-start to avoid output overshoot into capacitive loads. Use Value: Dual-reference architecture avoids level-shifting circuitry; 110mV SENSE threshold enables accurate current limiting at low output currents. |
Use Scenario: 5V/2A isolated power for CAN transceiver and microcontroller in EN 50121-compliant railway signaling nodes exposed to 100V surges. IC Role / Device Role / Timing Role: Flyback controller with SYNC tied to system clock for EMI reduction; SHDN/UVLO programmed for 40V–60V valid input window. Use Value: AEC-Q100 qualification ensures reliability under vibration and thermal cycling; exposed pad soldering meets IPC-A-610 Class 3 requirements. |
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 |
|---|---|---|---|
| LT3758EMSE#PBF | Same pinout and topology support, but LT3758 (not A) variant has slower load transient response and no AEC-Q100 qualification. | Acceptable for industrial non-automotive use where cost sensitivity outweighs transient performance or automotive compliance. | Select LT3758EMSE#PBF only if design does not require AEC-Q100 or improved transient behavior - verified in LT3758A datasheet Rev H, p.1. |
| MAX17595ATP+T | 4.5V–60V input range, 100kHz–2.2MHz frequency, no dual-reference FBX; requires external inverter for negative outputs. | Suitable for lower-input-voltage telecom or industrial apps; lacks 100V capability and integrated negative-reference path of LT3758AEMSE#PBF. | Choose MAX17595ATP+T only when input stays below 60V and negative outputs are not required - confirmed via Maxim datasheet DS4422. |
Compared with LT3758EMSE#PBF, the LT3758AEMSE#PBF adds AEC-Q100 qualification and faster load transient response; versus MAX17595ATP+T, it provides 100V input tolerance and native negative-output capability - making it uniquely suited for automotive and high-voltage industrial flyback/SEPIC designs.
Availability
LT3758AEMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment power, industrial 48V telecom supplies, and railway signaling interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3758AEMSE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive safety markets since 1965.
The LT3758A product line delivers high-voltage, current-mode DC/DC controllers optimized for ruggedized power conversion in automotive, telecom, and industrial environments - emphasizing input surge tolerance, thermal robustness, and topology flexibility.
FAQ
What is the maximum input voltage rating for LT3758AEMSE#PBF?
The LT3758AEMSE#PBF has an absolute maximum VIN rating of 100V, as specified in the Absolute Maximum Ratings table (Rev H, p.2). This allows direct interface with 72V battery systems and withstands automotive load-dump transients without external clamping. Operation above 100V risks permanent damage per Note 1.
How does LT3758AEMSE#PBF support both positive and negative output voltages?
The LT3758AEMSE#PBF uses a dual-reference error amplifier: FBX regulates to +1.6V for boost/flyback/SEPIC (positive outputs) or –0.8V for inverting configurations (negative outputs). No external op-amp is needed - the IC automatically selects the active reference based on FBX voltage polarity, as detailed in the Applications Information section (Rev H, p.10).
What is the purpose of the exposed pad on LT3758AEMSE#PBF?
The exposed pad (Pin 11) on LT3758AEMSE#PBF serves as both thermal conduction path and electrical ground return. It must be soldered to a PCB copper plane to achieve the specified θJA = 40°C/W for the MSOP package. It also functions as the Kelvin return for the SENSE current path, minimizing measurement error from PCB trace resistance.
Can LT3758AEMSE#PBF synchronize to an external clock, and what are the requirements?
Yes - the SYNC pin (Pin 5) accepts external TTL/CMOS clock signals. To ensure reliable locking, the internal RT-set frequency must be 20% slower than the SYNC frequency, and the SYNC pulse width must exceed 200ns. If synchronization is unused, SYNC must be tied to GND per Pin Functions description (Rev H, p.8).
What is the minimum off-time specification for LT3758AEMSE#PBF, and why does it matter?
The LT3758AEMSE#PBF has a typical minimum off-time of 220ns (Electrical Characteristics, Rev H, p.3). This limits the maximum duty cycle and thus constrains the achievable step-up ratio in boost or flyback topologies at high frequencies - e.g., at 1MHz, max theoretical duty is ~69%, affecting VOUT/VIN ratios in high-voltage-gain applications.
LT3758AEMSE#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
LT3758AEMSE#PBF FAQ
1.How can I place an order for LT3758AEMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758AEMSE#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 LT3758AEMSE#PBF reliable?
The price and inventory of LT3758AEMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758AEMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3758AEMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758AEMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758AEMSE#PBF?
LT3758AEMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758AEMSE#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 LT3758AEMSE#PBF?
For technical support, including LT3758AEMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758AEMSE#PBF requirements.
6.How does Aetrix verify that LT3758AEMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3758AEMSE#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 LT3758AEMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3758AEMSE#PBF?
All LT3758AEMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758AEMSE#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 LT3758AEMSE#PBF part is unused and in its original packaging.
Return procedure for LT3758AEMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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