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Analog Devices Inc. LT3758AEDD#TRPBF
- Part No.:
- LT3758AEDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3758AEDD#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,949
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Product details
Overview
LT3758AEDD#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 110mV SENSE threshold, internal 7.2V LDO, and AEC-Q100 qualification for automotive power systems.
For engineers reviewing the LT3758AEDD#TRPBF datasheet, LT3758AEDD#TRPBF pinout, LT3758AEDD#TRPBF application, or LT3758AEDD#TRPBF equivalent, this page provides verified functional identity, validated DFN-10 (3mm × 3mm) package mapping, confirmed 11-pin terminal roles, and two technically documented alternative controllers for high-voltage industrial and automotive DC/DC design.
Technical Context
The LT3758AEDD#TRPBF implements fixed-frequency current-mode control with slope compensation, enabling stable regulation across wide VIN/VOUT ranges and fast transient response. Its dual-reference error amplifier supports both positive (1.6V) and negative (–0.8V) FBX regulation, allowing seamless topology reconfiguration without hardware change.
It integrates an internal 7.2V LDO with 4.5V UVLO and 17.5V OVLO, programmable SHDN/UVLO hysteresis, soft-start via external capacitor on SS pin, and frequency synchronization via SYNC pin-requiring RT resistor set 20% below sync clock frequency for reliable locking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - enables direct connection to 48V telecom, 72V industrial, or 12V–48V automotive battery rails without pre-regulation. |
| SENSE Threshold | 110mV (typ) - sets peak switch current limit with ±10mV tolerance over temperature, critical for MOSFET SOA protection. |
| FBX Regulation | +1.6V or –0.8V - single-pin polarity selection enables positive or negative output without external op-amps or level shifters. |
| Switching Frequency | 100kHz–1MHz (RT-programmable) - balances efficiency (lower fSW) vs. size (higher fSW); minimum on/off time = 220ns limits max duty cycle at high fSW. |
| INTVCC LDO | 7.2V ±0.2V, 50mA max - powers gate driver and internal logic; dropout voltage ≤500mV at 10mA allows operation down to VIN = 7.7V. |
| Shutdown IQ | <1µA - preserves battery life in always-on automotive modules such as telematics or ADAS sensors during sleep mode. |
| AEC-Q100 Grade | Grade E (–40°C to +125°C) - qualified for under-hood automotive applications including engine control and lighting drivers. |
Pinout & Package
LT3758AEDD#TRPBF uses a 10-lead 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 11 = GND), rated for –40°C to +125°C junction temperature and θJA = 43°C/W with proper PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier compensation node | Connects external RC network to stabilize feedback loop; clamped during soft-start and fault conditions. |
| FBX (Pin 2) | Positive/negative feedback input | Dual-reference input: regulates to +1.6V for positive outputs or –0.8V for negative outputs; modulates frequency during faults. |
| SS (Pin 3) | Soft-start timing control | 10µA internal pull-up to 2.5V rail; external capacitor sets 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% slower than sync frequency for reliable locking. |
| SENSE (Pin 6) | Current sense amplifier input | Kelvin-connected to high-side of sense resistor; ±0.3V absolute max; enables accurate peak-current limiting. |
| GATE (Pin 7) | N-channel MOSFET gate driver output | Swings 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; bypass with ≥4.7µF ceramic capacitor; can be externally powered above 7.5V. |
| SHDN/UVLO (Pin 9) | Enable/disable and input undervoltage detection | 1.22V falling threshold with programmable hysteresis; <0.4V forces shutdown; 2µA internal pull-down enables precise turn-on/off voltage setting. |
| VIN (Pin 10) | Main input supply | Accepts 5.5V–100V; must be bypassed with ≥0.22µF ceramic capacitor near pin; powers internal LDO and logic. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Must be soldered to PCB ground plane; serves as GND reference and current-sense resistor return path. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range support | 5.5V–100V operation eliminates need for input pre-regulators in 24V/48V/72V industrial and commercial power systems. |
| Single-pin polarity selection | FBX pin accepts either positive or negative feedback networks-reduces BOM count and simplifies layout for dual-polarity designs. |
| Programmable soft-start | External capacitor on SS pin controls output voltage ramp rate, preventing inrush current and transformer saturation during startup. |
| Frequency foldback during overload | Reduces switching frequency when FBX approaches GND, limiting peak inductor current during short-circuit or startup faults. |
| Improved load transient response | LT3758A variant exhibits faster VC loop recovery vs. LT3758-critical for dynamic loads like LED drivers or motor control supplies. |
Applications
| Automotive Lighting Driver | Industrial Telecom Power Supply |
|---|---|
|
Use Scenario: High-brightness LED headlamp module requiring 48V input to 60V/1.5A constant-current output in engine compartment. IC Role / Device Role / Timing Role: Flyback controller regulating output via primary-side sensing; FBX configured for positive feedback; 300kHz switching balances efficiency and EMI. Use Value: AEC-Q100 qualification ensures reliability at 125°C ambient; 100V abs max VIN tolerates load-dump transients up to 85V. |
Use Scenario: 48V telecom rectifier feeding isolated 12V/5A auxiliary rail with strict hold-up time and efficiency requirements. IC Role / Device Role / Timing Role: Boost controller driving SiC MOSFET; RT set to 200kHz for optimal core loss vs. conduction loss trade-off. Use Value: 110mV SENSE threshold enables precise current limiting with low-value sense resistors, minimizing I²R loss in high-current paths. |
| Isolated Industrial Sensor Supply | High-Voltage Battery Management System |
|
Use Scenario: Isolated ±15V dual-rail supply for analog front-end of vibration sensor in factory automation equipment. IC Role / Device Role / Timing Role: Inverting SEPIC controller using FBX in negative mode; SYNC tied to system clock for EMI reduction. Use Value: Dual-reference FBX eliminates need for external inverting op-amp; internal 7.2V LDO powers gate driver without external bias supply. |
Use Scenario: 72V battery stack monitoring unit requiring 5V/200mA isolated supply from variable 40–90V input. IC Role / Device Role / Timing Role: Flyback controller with programmable UVLO hysteresis to prevent brown-out cycling during battery sag. Use Value: SHDN/UVLO pin allows precise turn-on at 42V and turn-off at 38V using external resistor divider-improving state-of-charge accuracy. |
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 |
|---|---|---|---|
| LTC3891EMSE#TRPBF | Fixed 150kHz frequency; no RT/SYNC; integrated bootstrap diode; lower VIN max (60V) | Better suited for cost-sensitive, fixed-frequency 48V systems where programmability is unnecessary | Select LTC3891 if board space and BOM count are prioritized over frequency flexibility and 100V capability |
| LM5165QPWPRQ1 | Integrated 65V MOSFET; lower IQ (15µA); no negative output support; smaller 8-pin WSON | Optimized for compact, low-power automotive body electronics-not for high-current or bipolar outputs | Choose LM5165QPWPRQ1 only for <1A, 65V-max, single-positive-output automotive modules with strict size constraints |
Compared with LT3758AEDD#TRPBF, LTC3891 offers simpler layout but sacrifices 100V rating and topology flexibility, while LM5165QPWPRQ1 integrates power FETs at the cost of output polarity limitation and reduced voltage margin-making LT3758AEDD#TRPBF uniquely suitable for programmable, bipolar, high-voltage industrial and automotive converters.
Availability
LT3758AEDD#TRPBF is available at Aetrix Electronics and suitable for automotive lighting drivers, industrial telecom power supplies, isolated sensor supplies, and high-voltage battery management systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LT3758AEDD#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, Inc. 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, signal chain, and RF solutions.
The LT3758A series belongs to Analog Devices' high-voltage DC/DC controller product line, designed specifically for robust, flexible power conversion in harsh environments-including automotive under-hood, telecom infrastructure, and industrial automation systems.
FAQ
What is the key functional difference between LT3758 and LT3758A?
The LT3758AEDD#TRPBF improves load transient response versus the LT3758 due to enhanced error amplifier dynamics and optimized internal compensation. This results in faster recovery from step-load changes-critical in applications like LED drivers or servo power supplies where output stability under dynamic loads is essential. All other pinout, package, and specification parameters remain identical between the two variants.
Can LT3758AEDD#TRPBF drive a P-channel MOSFET instead of N-channel?
No, LT3758AEDD#TRPBF is designed exclusively for low-side N-channel MOSFET drive via its GATE pin, which swings between INTVCC and GND. It lacks high-side gate drive capability or bootstrap circuitry required for P-channel or high-side N-channel configurations. For P-channel use, external level-shifting or dedicated high-side drivers are mandatory-and not supported by LT3758AEDD#TRPBF's architecture.
How does the FBX pin support both positive and negative output regulation?
The LT3758AEDD#TRPBF contains dual internal references: +1.6V for positive output configurations and –0.8V for negative outputs. When FBX voltage is pulled above GND (e.g., via resistor divider from positive VOUT), the +1.6V reference activates; when pulled below GND (e.g., from negative VOUT), the –0.8V reference engages. The error amplifier automatically selects the active reference-enabling polarity switching without external components.
What is the minimum recommended capacitor value for the INTVCC pin?
The LT3758AEDD#TRPBF requires a minimum 4.7µF ceramic capacitor with low ESR placed directly between INTVCC (Pin 8) and GND (Pin 11). This capacitor must be located adjacent to the IC to handle high di/dt gate drive currents and prevent INTVCC droop during switching transitions. Using less capacitance risks intermittent gate drive failure or thermal shutdown under heavy load.
Is LT3758AEDD#TRPBF compatible with synchronous rectification?
No, LT3758AEDD#TRPBF does not provide secondary-side timing signals or dedicated SR control outputs. It is a primary-side controller only, intended for use with diode-based rectification in flyback/SEPIC or external MOSFETs driven by separate gate drivers. Synchronous rectification requires additional timing circuitry or a dedicated SR controller such as the LT3900 or LT3905 paired with LT3758AEDD#TRPBF.
LT3758AEDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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-DFN (3x3)
LT3758AEDD#TRPBF FAQ
1.How can I place an order for LT3758AEDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758AEDD#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 LT3758AEDD#TRPBF reliable?
The price and inventory of LT3758AEDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758AEDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3758AEDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758AEDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758AEDD#TRPBF?
LT3758AEDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758AEDD#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 LT3758AEDD#TRPBF?
For technical support, including LT3758AEDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758AEDD#TRPBF requirements.
6.How does Aetrix verify that LT3758AEDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3758AEDD#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 LT3758AEDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3758AEDD#TRPBF?
All LT3758AEDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758AEDD#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 LT3758AEDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3758AEDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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