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Analog Devices Inc. LT3758IMSE#TRPBF
- Part No.:
- LT3758IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3758IMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,053
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Product details
Overview
LT3758IMSE#TRPBF 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 drives external N-channel MOSFETs via a 7.2V internal LDO, features programmable 100kHz–1MHz switching frequency, <1µA shutdown current, and AEC-Q100 qualification for automotive systems.
For engineers reviewing the LT3758IMSE#TRPBF datasheet, LT3758IMSE#TRPBF pinout, LT3758IMSE#TRPBF application, or LT3758IMSE#TRPBF equivalent, this page delivers verified topology flexibility, precise UVLO hysteresis programming, FBX-based dual-polarity feedback control, and thermal-aware gate drive capability - all critical for high-reliability industrial and automotive power supply design.
Technical Context
The LT3758IMSE#TRPBF implements fixed-frequency current-mode control with slope compensation, enabling stable operation across wide VIN (5.5V–100V) and VOUT ranges. Its dual-reference FBX pin accepts either +1.6V (positive output) or –0.8V (negative output) regulation thresholds, with dedicated overvoltage lockout comparators (±8%/±11% hysteresis) for each polarity.
It integrates a 7.2V LDO (4.5V UVLO, 17.5V OVLO) powering the gate driver and internal logic, with INTVCC current limiting that scales inversely with VIN to prevent thermal runaway. The 220ns minimum on/off times and RT-resistor programmability (100kHz–1MHz) support optimized trade-offs between efficiency, component size, and EMI performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to 48V telecom, 72V industrial, or 96V battery systems without pre-regulation. |
| FBX Regulation Voltage | +1.6V or –0.8V - enables single-pin configuration of positive or negative output voltages without external polarity-switching circuitry. |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor; allows optimization of inductor size vs. switching loss in high-voltage converters. |
| SENSE Threshold | 110mV (typ) - sets peak switch current limit; enables accurate current sensing with low-value, low-power sense resistors. |
| Shutdown IQ | <1µA - preserves battery life in always-on automotive modules or remote sensors during sleep mode. |
| INTVCC LDO | 7.2V ±0.2V - powers gate driver and internal logic; bypassed with ≥4.7µF ceramic capacitor for transient gate charge delivery. |
| Temp Range | –40°C to +125°C - qualified for under-hood automotive and industrial environments per AEC-Q100 Grade I. |
Pinout & Package
LT3758IMSE#TRPBF 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier compensation node | Accepts RC network to stabilize voltage loop; clamped during soft-start and fault conditions. |
| FBX (Pin 2) | Positive/negative feedback input | Dual-reference input: +1.6V for boost/flyback/SEPIC; –0.8V for inverting configurations; also triggers frequency foldback near GND. |
| SS (Pin 3) | Soft-start timing control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO, INTVCC fault, or thermal lockout. |
| RT (Pin 4) | Frequency programming | Resistor-to-GND sets switching frequency (100kHz–1MHz); open-circuit disables operation. |
| SYNC (Pin 5) | External clock synchronization | 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 cycle-by-cycle limiting and PWM control. |
| GATE (Pin 7) | N-MOSFET gate driver output | Swings between INTVCC and GND; forced low during shutdown, thermal fault, or INTVCC UV/OV conditions. |
| 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 externally powered above 7.5V. |
| SHDN/UVLO (Pin 9) | Enable/disable and input UVLO | 1.22V falling threshold with programmable hysteresis; resets soft-start on undervoltage; pulls <1µA in shutdown. |
| VIN (Pin 10) | Main input supply | Accepts 5.5V–100V; requires local 0.22µF+ ceramic bypass; powers internal LDO and supplies gate drive current. |
| GND (Pin 11) | Power and signal ground | Exposed thermal pad; serves as current-sense return path and primary ground reference for all analog and power circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | 5.5V to 100V operation eliminates need for pre-regulators in 48V/72V/96V systems and simplifies front-end design. |
| Single-pin bipolar feedback | FBX pin supports both +1.6V and –0.8V regulation references - enables seamless reconfiguration between positive and negative outputs without board changes. |
| Programmable UVLO with hysteresis | SHDN/UVLO pin allows precise turn-on/turn-off thresholds using external resistors - prevents brownout oscillation in fluctuating input rails. |
| Thermal-aware gate drive | INTVCC current limit decreases with rising VIN - protects IC from overheating when driving large MOSFETs at high frequencies and high input voltages. |
| Frequency foldback during overload | Reduces switching frequency when FBX approaches GND - limits inductor current during start-up or output short-circuit without external circuitry. |
Applications
| Automotive Infotainment Power Supply | Industrial Telecom Rectifier |
|---|---|
Use Scenario: Generating isolated 12V/1.2A from 36V–72V vehicle battery for head unit display and audio amplifiers. IC Role / Device Role / Timing Role: Flyback controller with synchronous rectification support, regulating output via optocoupler feedback to FBX pin. Use Value: AEC-Q100 qualification ensures reliability in under-hood temperature cycling; 100V absolute max rating withstands load-dump transients. |
Use Scenario: Non-isolated 24V/3A SEPIC converter accepting 18V–72V telecom input for base station backplane power. IC Role / Device Role / Timing Role: High-efficiency SEPIC controller with RT-programmed 300kHz switching and soft-start for hot-swap compatibility. Use Value: Wide VIN range eliminates need for multiple input-range SKUs; current-mode control provides fast transient response to burst traffic loads. |
| High-Voltage Sensor Interface | Ruggedized Inverting Converter |
Use Scenario: 5.5V–100V input to –15V/100mA bias supply for industrial current-sense amplifiers and isolation barriers. IC Role / Device Role / Timing Role: Inverting controller using FBX referenced to –0.8V; SENSE monitors high-side switch current. Use Value: Single FBX pin eliminates polarity-select logic; 110mV current limit enables precise low-power sensing with 0.03Ω resistor. |
Use Scenario: Negative output generation for op-amp rails in railway signaling equipment operating from 72V nominal battery. IC Role / Device Role / Timing Role: Inverting topology controller with programmable UVLO to survive cold-cranking (5.5V min) and load dump (100V max). Use Value: Minimum 220ns on/off times enable stable operation at high duty cycles required for deep negative conversion ratios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-input-voltage controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3895EMSE#TRPBF | Higher integration: includes 75V-rated gate driver, no external N-FET required; fixed 100kHz–850kHz frequency range; no negative output capability. | Best for boost-only or buck-boost designs where integrated driver reduces BOM count; unsuitable for inverting or flyback topologies requiring external FET. | Select LTC3895EMSE#TRPBF when gate driver integration and simplified layout outweigh topology flexibility needs. |
| LM5165QPWPRQ1 | Lower VIN max (65V); integrated 150mA LDO; fixed 100kHz–2.2MHz frequency; only supports buck topology; no FBX polarity switching. | Targeted at lower-voltage automotive body electronics (e.g., 12V/24V systems); lacks flyback/SEPIC/inverting support and high-voltage robustness. | Choose LM5165QPWPRQ1 only for cost-sensitive buck regulators in ≤65V automotive applications where topology and voltage margin are constrained. |
Compared with LTC3895EMSE#TRPBF and LM5165QPWPRQ1, LT3758IMSE#TRPBF uniquely supports four topologies (boost/flyback/SEPIC/inverting) with bipolar output capability and 100V absolute input rating - making it the sole option for ruggedized, multi-configuration high-voltage power supplies in automotive and industrial settings.
Availability
LT3758IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial telecom rectifiers, high-voltage sensor interfaces, and ruggedized inverting converters requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3758IMSE#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 precision instrumentation, industrial automation, and automotive safety markets.
The LT3758 product line delivers high-voltage, multi-topology DC/DC controllers designed for demanding power conversion in automotive, telecom, and industrial systems where input transients, wide voltage range, and topology flexibility are critical.
FAQ
What topology configurations does the LT3758IMSE#TRPBF support?
The LT3758IMSE#TRPBF supports boost, flyback, SEPIC, and inverting converter topologies. Its dual-reference FBX pin accepts either +1.6V (for positive outputs) or –0.8V (for negative outputs), enabling reconfiguration without hardware changes. This makes LT3758IMSE#TRPBF especially valuable in systems requiring flexible output polarity or isolation schemes across diverse input voltage conditions.
How is the switching frequency programmed on the LT3758IMSE#TRPBF?
The LT3758IMSE#TRPBF uses an external resistor from the RT pin (Pin 4) to GND to set switching frequency from 100kHz to 1MHz. For example, a 41.2kΩ resistor yields ~300kHz. The RT pin must never be left floating. When synchronization is needed, the SYNC pin accepts an external clock, and the RT resistor should be selected for a frequency 20% slower than the SYNC signal - ensuring reliable locking of LT3758IMSE#TRPBF operation.
Can the LT3758IMSE#TRPBF drive high-side N-channel MOSFETs?
No - the LT3758IMSE#TRPBF drives only low-side N-channel MOSFETs via its GATE pin, which swings between INTVCC and GND. It does not include a high-side driver or bootstrap circuitry. For high-side switching, external level-shifting or gate-driver ICs are required. The LT3758IMSE#TRPBF's architecture is optimized for standard boost, flyback, SEPIC, and inverting configurations where the main switch connects to ground.
What is the purpose of the exposed pad on the LT3758IMSE#TRPBF MSOP package?
The exposed pad (Pin 11) on the LT3758IMSE#TRPBF MSOP package serves as the primary thermal path and electrical ground return. It must be soldered directly to a PCB copper plane for effective heat dissipation (θJA = 40°C/W). Critically, it also functions as the Kelvin return path for the SENSE pin current measurement - ensuring accurate current sensing by minimizing PCB trace resistance errors in the feedback loop of LT3758IMSE#TRPBF.
Does the LT3758IMSE#TRPBF require external components for UVLO hysteresis programming?
Yes - the SHDN/UVLO pin (Pin 9) uses an external resistor divider to program both turn-on and turn-off thresholds. A 1.22V internal reference and 2µA pull-down current source allow precise hysteresis calculation: VIN,FALLING = 1.22 × (R3 + R4)/R4 and VIN,RISING = 2µA × R3 + VIN,FALLING. This enables robust startup behavior in noisy or slowly ramping input rails - a key requirement for reliable operation of LT3758IMSE#TRPBF in automotive and industrial environments.
LT3758IMSE#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
LT3758IMSE#TRPBF FAQ
1.How can I place an order for LT3758IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758IMSE#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 LT3758IMSE#TRPBF reliable?
The price and inventory of LT3758IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3758IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758IMSE#TRPBF?
LT3758IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758IMSE#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 LT3758IMSE#TRPBF?
For technical support, including LT3758IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3758IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3758IMSE#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 LT3758IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3758IMSE#TRPBF?
All LT3758IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758IMSE#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 LT3758IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3758IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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