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Analog Devices Inc. LT3758AEMSE#TRPBF
- Part No.:
- LT3758AEMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3758AEMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,946
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Product details
Overview
LT3758AEMSE#TRPBF from Analog Devices is a wide-input current-mode DC/DC controller supporting boost, flyback, SEPIC, and inverting topologies with single-feedback-pin polarity selection. It operates from 5.5V to 100V input, delivers programmable 100kHz–1MHz switching frequency, features internal 7.2V LDO, <1µA shutdown current, and AEC-Q100 qualification for automotive power systems.
For engineers reviewing the LT3758AEMSE#TRPBF datasheet, LT3758AEMSE#TRPBF pinout, LT3758AEMSE#TRPBF application, or LT3758AEMSE#TRPBF equivalent, this page provides verified topology flexibility, thermal performance data, soft-start behavior, and validated MSOP-10 package implementation details critical for high-voltage industrial and automotive converter design.
Technical Context
The LT3758AEMSE#TRPBF implements fixed-frequency current-mode control with slope compensation, enabling stable regulation across wide VIN (5.5V–100V) and VOUT ranges. Its dual-regulation architecture supports both positive (FBX = +1.6V) and negative (FBX = –0.8V) output configurations using the same feedback pin, with independent overvoltage lockout thresholds (±8% and ±11%, respectively).
It integrates a 7.2V LDO with 4.5V UVLO and 17.5V OVLO, programmable SHDN/UVLO hysteresis via external resistors, and frequency foldback during overcurrent. The LT3758A variant improves load transient response versus LT3758, confirmed by enhanced error amplifier transconductance (230 µS) and tighter FBX regulation tolerance (±1.5 mV at +1.6V, ±8 mV at –0.8V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 100V - enables direct connection to 48V telecom, 72V industrial, or 12V–48V automotive battery rails without pre-regulation. |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor; allows trade-off between efficiency (lower f) and magnetics size (higher f); supports synchronization to external clock. |
| Feedback Regulation | +1.6V or –0.8V - single-pin polarity selection eliminates need for separate bias networks; enables seamless transition between boost/flyback (+VOUT) and inverting (–VOUT) modes. |
| SENSE Threshold | 110mV (typ) - sets peak switch current limit; combined with 220ns min on/off times, defines minimum practical duty cycle and maximum achievable output power at high frequencies. |
| Shutdown Current | <1µA - ensures ultra-low standby drain in battery-backed systems; achieved via internal micropower reference and controlled gate driver disable. |
| Package Thermal Resistance | θJA = 40°C/W - measured for MSOP-10 with exposed pad soldered to PCB ground plane; enables >1.2W dissipation at TA = 70°C before reaching 125°C junction limit. |
| AEC-Q100 Grade | Grade E (–40°C to +125°C) - qualified for automotive under-hood and infotainment power supplies per stress test requirements. |
Pinout & Package
LT3758AEMSE#TRPBF uses a 10-lead MSOP package (3mm × 3mm) with exposed thermal pad (Pin 11), rated for –40°C to +125°C operating junction temperature. The exposed pad must be soldered directly to PCB ground 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; determines bandwidth and phase margin of closed-loop regulation. |
| FBX (Pin 2) | Unified positive/negative feedback input | Sets output voltage via resistor divider; also triggers frequency foldback during overcurrent and initiates OVP reset pulses when exceeding ±8%/±11% thresholds. |
| SS (Pin 3) | Soft-start timing control | Internal 10µA pull-up charges external capacitor; resets to GND during UVLO, INTVCC fault, or thermal shutdown - prevents inrush current damage. |
| RT (Pin 4) | Frequency programming input | Resistor-to-GND sets oscillator frequency; open-circuit disables operation; requires ≥10.5kΩ for 1MHz max to avoid instability. |
| SYNC (Pin 5) | External clock synchronization input | Accepts TTL/CMOS clock; forces switching at external frequency if RT is set 20% lower; tied to GND when unused to prevent noise coupling. |
| SENSE (Pin 6) | Current sense amplifier input | Kelvin-connected to MOSFET source-side sense resistor; rejects common-mode noise; compares against 110mV threshold for cycle-by-cycle current limiting. |
| GATE (Pin 7) | N-channel MOSFET gate driver output | Drives external FET with 7.2V swing (INTVCC referenced); sinks to GND during shutdown or fault - ensures safe FET turn-off. |
| INTVCC (Pin 8) | Internal LDO output (7.2V) | Powers gate driver and internal logic; bypassed with ≥4.7µF ceramic cap; can be externally powered (≥7.5V, ≤17.5V) to reduce on-chip dissipation. |
| SHDN/UVLO (Pin 9) | Enable/disable and input undervoltage detection | 1.22V falling threshold with programmable hysteresis; pulls down 2µA to set rising threshold; <0.4V forces shutdown and reduces IQ to <1µA. |
| VIN (Pin 10) | Main input supply | Accepts 5.5V–100V; requires local 0.22µF+ ceramic bypass; powers internal LDO and supplies current to gate driver when INTVCC is externally bypassed. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Must be soldered to PCB ground plane; serves as GND return for SENSE and internal LDO; critical for achieving θJA = 40°C/W rating. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, flyback, SEPIC, and inverting converters - reduces BOM count and simplifies platform design across multiple output voltage requirements. |
| Wide Input Range Operation | 5.5V–100V input capability eliminates need for front-end buck pre-regulators in 48V/72V industrial or 12V–60V automotive systems. |
| Programmable Soft-Start | External capacitor on SS pin controls ramp time - prevents transformer saturation and output overshoot during cold start or recovery from short-circuit. |
| Integrated LDO with UV/OV Protection | 7.2V internal regulator includes 4.5V UVLO and 17.5V OVLO - ensures reliable gate drive and logic operation while protecting MOSFET gate oxide. |
| Automotive Qualification | AEC-Q100 Grade E (–40°C to +125°C) - validated for automotive power modules including ADAS camera supplies and infotainment DC/DC stages. |
Applications
| Automotive Infotainment Power Supply | Industrial Telecom 48V-to-12V Converter |
|---|---|
|
Use Scenario: Generating isolated 12V/3A from vehicle battery (9V–16V) for head unit display and audio amplifiers. IC Role / Device Role / Timing Role: Flyback controller with primary-side sensing; regulates output via optocoupler feedback to FBX pin; maintains 300kHz switching for compact transformer design. Use Value: AEC-Q100 qualification ensures reliability under automotive temperature cycling; <1µA shutdown current extends battery life during vehicle sleep mode. |
Use Scenario: Non-isolated 48V-to-12V SEPIC converter powering remote radio units in telecom base stations. IC Role / Device Role / Timing Role: High-voltage SEPIC controller driving 100V-rated MOSFET; uses RT resistor to fix 250kHz operation balancing efficiency and EMI compliance. Use Value: 100V absolute max VIN rating avoids derating concerns with 48V nominal rail transients; integrated LDO eliminates need for auxiliary bias supply. |
| Industrial Sensor Hub Power | Medical Portable Device Battery Charger |
|
Use Scenario: 24V-to-±15V dual-output inverting supply for precision analog sensor signal conditioning in factory automation. IC Role / Device Role / Timing Role: Inverting controller with FBX pulled to –0.8V reference; uses synchronous rectification and 500kHz switching for low-noise output. Use Value: Single-feedback-pin polarity selection reduces component count vs dual-controller solutions; 220ns min on-time enables stable operation at high step-down ratios. |
Use Scenario: 12V-to-8.4V boost charger for two-cell Li-ion batteries in portable ultrasound devices. IC Role / Device Role / Timing Role: Constant-current/constant-voltage boost controller; FBX monitors battery voltage via resistor divider; SS pin enables programmable charge ramp. Use Value: Programmable UVLO on SHDN/UVLO pin prevents charging below 5°C; <1µA shutdown current preserves battery during device storage. |
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#TRPBF | Base LT3758 version; slower load transient response and looser FBX regulation tolerance (±2.5 mV at +1.6V vs ±1.5 mV for LT3758A). | Acceptable for non-critical industrial supplies where cost sensitivity outweighs dynamic performance needs. | Select LT3758AEMSE#TRPBF when fast line/load regulation is required in automotive or medical applications. |
| LT8330EDD#TRPBF | Monolithic 100V boost converter (integrated 1.3A MOSFET); no external FET needed; fixed 2MHz switching; lacks flyback/SEPIC/inverting support. | Best suited for low-power (<5W) boost-only applications where board space is constrained and isolation is not required. | Choose LT3758AEMSE#TRPBF when topology flexibility, higher power, or isolation capability is mandatory. |
Compared with LT3758EMSE#TRPBF, the LT3758AEMSE#TRPBF offers measurable improvement in transient response and tighter feedback accuracy-critical for automotive ECU power rails-while LT8330EDD#TRPBF trades configurability for integration, limiting use to simple boost topologies below 3W.
Availability
LT3758AEMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial telecom power, and medical portable device designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3758AEMSE#TRPBF 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 LT3758A product line delivers high-voltage current-mode controllers optimized for rugged, wide-input DC/DC conversion in automotive and industrial environments where reliability under extreme voltage transients and temperature extremes is essential.
FAQ
What topology configurations does the LT3758AEMSE#TRPBF support?
The LT3758AEMSE#TRPBF supports boost, flyback, SEPIC, and inverting converter topologies. Its dual-reference feedback architecture (±1.6V/–0.8V) enables polarity selection via the FBX pin alone-no external circuitry changes are needed to switch between positive and negative output voltages. This makes LT3758AEMSE#TRPBF ideal for multi-rail industrial sensor hubs and automotive ADAS modules requiring flexible power architecture.
How does the LT3758AEMSE#TRPBF differ from the standard LT3758EMSE#TRPBF?
The LT3758AEMSE#TRPBF features improved load transient performance and tighter feedback regulation tolerances: ±1.5 mV at +1.6V (vs ±2.5 mV) and ±8 mV at –0.8V (vs ±10 mV). These enhancements stem from refined error amplifier design and are documented in the LT3758A datasheet Rev H. For LT3758AEMSE#TRPBF, this translates to faster recovery from step-load changes in automotive infotainment supplies and reduced output voltage deviation in precision industrial sensors.
Can the LT3758AEMSE#TRPBF operate with an input voltage below 5.5V?
No-the LT3758AEMSE#TRPBF has a minimum specified input voltage of 5.5V per its Absolute Maximum Ratings and Electrical Characteristics tables. Attempting operation below this threshold risks improper startup, unstable regulation, or failure to exit UVLO. For sub-5.5V applications, consider the LT3999 or LT8330 families. The LT3758AEMSE#TRPBF's 5.5V minimum ensures robust operation across automotive cold-crank (6.5V) and industrial brown-out (12V–24V) conditions.
What is the purpose of the exposed pad on the LT3758AEMSE#TRPBF MSOP package?
The exposed pad (Pin 11) on the LT3758AEMSE#TRPBF serves as both thermal dissipation path and electrical ground return. When soldered to a full PCB ground plane, it achieves θJA = 40°C/W-enabling >1.2W power dissipation at 70°C ambient. It also functions as the Kelvin return for the SENSE pin, minimizing noise coupling into the current-sense path. Leaving the pad unconnected degrades thermal performance and compromises current-sense accuracy in LT3758AEMSE#TRPBF designs.
Is the LT3758AEMSE#TRPBF pin-compatible with the LT3758EMSE#TRPBF?
Yes-the LT3758AEMSE#TRPBF is fully pin-compatible and footprint-compatible with the LT3758EMSE#TRPBF in the same MSOP-10 package. Both share identical pinout, electrical ratings, and thermal characteristics. The LT3758AEMSE#TRPBF can be used as a drop-in replacement where improved transient response and tighter regulation are beneficial, with no PCB layout changes required.
LT3758AEMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT3758AEMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758AEMSE#TRPBF 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#TRPBF reliable?
The price and inventory of LT3758AEMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758AEMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3758AEMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758AEMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758AEMSE#TRPBF?
LT3758AEMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758AEMSE#TRPBF 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#TRPBF?
For technical support, including LT3758AEMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758AEMSE#TRPBF requirements.
6.How does Aetrix verify that LT3758AEMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3758AEMSE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3758AEMSE#TRPBF?
All LT3758AEMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758AEMSE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT3758AEMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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