My Inquiry
My Account
Analog Devices Inc. LT3758AIDD#PBF
- Part No.:
- LT3758AIDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3758AIDD#PBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:286
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3758AIDD#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-pin positive/negative output voltage programming. It drives external N-channel MOSFETs via a 7.2V internal LDO, features 100kHz–1MHz programmable frequency, <1µA shutdown current, and AEC-Q100 qualification for automotive use.
For engineers reviewing the LT3758AIDD#PBF datasheet, LT3758AIDD#PBF pinout, LT3758AIDD#PBF application, or LT3758AIDD#PBF equivalent, this controller enables robust high-voltage power conversion in battery-powered telecom, industrial, and automotive systems where input transients, thermal constraints, and output polarity flexibility are critical selection factors.
Technical Context
The LT3758AIDD#PBF implements fixed-frequency current-mode control with slope compensation, delivering stable regulation across wide VIN (5.5V–100V) and VOUT ranges. Its dual-reference error amplifier supports both +1.6V and –0.8V FBX thresholds, enabling seamless reconfiguration between positive- and negative-output topologies without hardware change.
It integrates a 7.2V low-dropout regulator (4.5V UVLO, 17.5V OVLO), programmable SHDN/UVLO with hysteresis, soft-start via SS pin, frequency foldback during overcurrent, and SYNC capability for external clock synchronization - all within a thermally enhanced 10-lead 3mm × 3mm DFN package with exposed ground pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to 48V telecom, 72V industrial, or 12V–48V automotive battery rails with transient tolerance. |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor; enables optimization of magnetics size vs. efficiency and EMI performance. |
| SENSE Threshold | 110mV (typ) - defines peak switch current limit; allows precise MOSFET current sensing with low-value, low-power sense resistors. |
| FBX Regulation | +1.6V or –0.8V - dual-reference feedback enables single-pin configuration of positive or negative output without external op-amps. |
| Shutdown IQ | <1µA - minimizes battery drain in always-on automotive or remote monitoring applications during sleep mode. |
| INTVCC Regulator | 7.2V ±0.2V - powers gate driver and internal logic; bypassed with ≥4.7µF ceramic capacitor for high di/dt gate drive support. |
| Package | 10-Lead 3mm × 3mm DFN with exposed pad - provides θJA = 43°C/W thermal resistance when soldered to PCB ground plane. |
Pinout & Package
LT3758AIDD#PBF is housed in a 10-lead, 3mm × 3mm plastic DFN package (DD) with exposed thermal pad (Pin 11) that must be soldered to PCB ground for thermal and electrical integrity. The package operates from –40°C to +125°C junction temperature.
| 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 | Receives output divider voltage; selects +1.6V or –0.8V reference based on polarity; modulates frequency during faults. |
| 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 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 if unused. |
| SENSE (Pin 6) | Current sense input | Kelvin-connected to MOSFET source-side sense resistor; ±0.3V absolute max; triggers immediate shutdown at >110mV. |
| GATE (Pin 7) | N-channel MOSFET gate driver output | Swings between INTVCC and GND; forced low during shutdown, thermal lockout, or INTVCC UV/OV. |
| INTVCC (Pin 8) | Internal 7.2V LDO output | Powers gate driver and internal circuitry; requires ≥4.7µF local ceramic bypass; can be externally powered above 7.5V. |
| 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. |
| VIN (Pin 10) | Main input supply | Accepts 5.5V–100V; requires ≥0.22µF local ceramic bypass; powers internal LDO and supplies gate driver when INTVCC is bypassed. |
| Exposed Pad (Pin 11) | Thermal and electrical ground | Must be soldered to PCB ground plane; serves as GND return and current-sense resistor negative terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | 5.5V–100V operation eliminates need for pre-regulators in 48V telecom or 72V industrial systems. |
| Dual-polarity feedback architecture | Single FBX pin supports +1.6V or –0.8V regulation - enables boost/flyback/SEPIC (positive) or inverting (negative) outputs without redesign. |
| Programmable frequency with SYNC | RT resistor sets 100kHz–1MHz range; SYNC pin allows deterministic phase alignment across multiple converters for EMI reduction. |
| Low shutdown quiescent current | <1µA shutdown IQ extends battery life in automotive infotainment or telematics modules requiring persistent wake capability. |
| AEC-Q100 qualified | Rated for –40°C to +125°C operation with automotive-grade reliability testing - suitable for under-hood and ADAS power supplies. |
Applications
| Automotive Infotainment Power Supply | Industrial 48V-to-24V SEPIC Converter |
|---|---|
|
Use Scenario: Powering head unit displays and audio amplifiers from vehicle battery (9V–16V) with cold-crank tolerance up to 100V. IC Role / Device Role / Timing Role: Primary controller in non-isolated SEPIC topology providing regulated 12V/24V output with polarity retention and input surge resilience. Use Value: Eliminates need for isolated flyback while maintaining output polarity and surviving load-dump transients per ISO 16750-2. |
Use Scenario: Generating stable 24V rail from 48V telecom or industrial bus with high efficiency and compact footprint. IC Role / Device Role / Timing Role: Current-mode controller driving discrete N-MOSFET in boost-derived SEPIC configuration with 300kHz switching. Use Value: Enables high step-down ratio without transformer, reduces EMI through programmable frequency, and supports wide input tolerance. |
| Telecom Base Station Bias Supply | Negative Rail Generator for Op-Amp Circuits |
|
Use Scenario: Providing isolated –5V and +5V bias for RF front-end amplifiers and ADC drivers in 48V-powered base stations. IC Role / Device Role / Timing Role: Flyback controller operating in discontinuous conduction mode (DCM) with synchronous rectification control. Use Value: Achieves tight cross-regulation and low noise via current-mode control; supports 100kHz–1MHz frequency tuning for EMI compliance. |
Use Scenario: Generating clean –12V rail from +12V input for precision instrumentation op-amps and analog sensors. IC Role / Device Role / Timing Role: Inverting buck-boost controller using single FBX pin referenced to –0.8V, eliminating need for external inverting amplifier. Use Value: Reduces BOM count and layout area versus charge-pump or dual-supply solutions while maintaining low output ripple. |
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 |
|---|---|---|---|
| LTC3895EFE#PBF | Fixed 150kHz frequency; no FBX polarity switching; integrated gate drivers for dual-phase operation. | Targeted at high-current synchronous buck applications, not flyback/inverting topologies. | Select when needing dual-phase buck control with integrated drivers, not multi-topology flexibility. |
| LM5165QPWPRQ1 | Lower VIN max (65V); integrated 5V LDO; no negative output support; smaller 8-pin WSON package. | Optimized for space-constrained automotive body electronics, not high-voltage industrial or telecom. | Select for cost-sensitive, lower-voltage automotive applications where negative output and 100V tolerance are unnecessary. |
Compared with LTC3895EFE#PBF and LM5165QPWPRQ1, the LT3758AIDD#PBF uniquely supports both positive and negative output configurations across 5.5V–100V input, making it irreplaceable for flyback-based isolated supplies or inverting rails in harsh environments - whereas alternatives trade topology flexibility for integration or voltage range.
Availability
LT3758AIDD#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 48V power distribution, and telecom base station biasing requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT3758AIDD#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 industrial, automotive, communications, and healthcare markets.
The LT3758A series belongs to Analog Devices' high-voltage DC/DC controller product line, designed specifically for rugged, flexible power conversion in automotive, telecom, and industrial systems where input transients, wide VIN, and topology versatility are essential.
FAQ
What is the key functional difference between LT3758AIDD#PBF and the base LT3758?
The LT3758AIDD#PBF features improved load transient response compared to the LT3758, as confirmed in the datasheet's description section. This enhancement results from internal compensation and error amplifier optimizations, yielding tighter output regulation during rapid load steps - critical for powering sensitive microcontrollers or RF circuits in automotive and telecom applications. The LT3758AIDD#PBF retains full pin compatibility and identical specifications for VIN range, frequency programming, and protection features.
Can LT3758AIDD#PBF operate with an input voltage below 5.5V?
No, LT3758AIDD#PBF requires a minimum VIN of 5.5V for normal operation, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this threshold, the internal LDO cannot regulate INTVCC, and the SHDN/UVLO pin may not function reliably. For sub-5.5V applications, alternative controllers such as the LT8609S or LM5165 should be evaluated - the LT3758AIDD#PBF is not rated or characterized for operation below 5.5V.
How is the LT3758AIDD#PBF protected against overvoltage on the FBX pin?
The LT3758AIDD#PBF includes dual overvoltage lockout comparators on the FBX pin: one triggers at +8% above +1.6V (i.e., ~1.73V) with 20mV hysteresis, and another at –11% below –0.8V (i.e., ~–0.89V) with 10mV hysteresis. When either condition occurs - such as during startup overshoot or short-circuit recovery - the comparators force the main RS latch to reset, holding the GATE pin low until FBX returns within safe bounds. This protects downstream components without requiring external clamping circuits.
Does LT3758AIDD#PBF require an external bootstrap capacitor?
No, LT3758AIDD#PBF does not require a bootstrap capacitor because it drives only a low-side N-channel MOSFET and uses an internal 7.2V LDO (INTVCC) to power the gate driver. The GATE pin swings directly between INTVCC and GND, eliminating the need for high-side floating bias generation. A 4.7µF ceramic capacitor on INTVCC is mandatory for gate drive stability, but no bootstrap network is used or supported in the LT3758AIDD#PBF design.
Is LT3758AIDD#PBF compatible with synchronous rectification?
The LT3758AIDD#PBF itself does not provide dedicated synchronous rectifier drive signals; it is a controller for the primary-side switch only. However, it can be used in flyback or forward topologies with external synchronous rectifier controllers (e.g., LTC3900) or discrete gate drivers timed to the main switch. The LT3758AIDD#PBF's accurate timing, frequency foldback, and fast transient response make it well-suited as the master controller in such hybrid designs - but synchronous rectification requires additional circuitry beyond the LT3758AIDD#PBF.
LT3758AIDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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-DFN (3x3)
LT3758AIDD#PBF FAQ
1.How can I place an order for LT3758AIDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3758AIDD#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 LT3758AIDD#PBF reliable?
The price and inventory of LT3758AIDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3758AIDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3758AIDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3758AIDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3758AIDD#PBF?
LT3758AIDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3758AIDD#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 LT3758AIDD#PBF?
For technical support, including LT3758AIDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3758AIDD#PBF requirements.
6.How does Aetrix verify that LT3758AIDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3758AIDD#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 LT3758AIDD#PBF meets industry standards.
7.What is the process for return or replacement of LT3758AIDD#PBF?
All LT3758AIDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3758AIDD#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 LT3758AIDD#PBF part is unused and in its original packaging.
Return procedure for LT3758AIDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3758AIDD#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
