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Analog Devices Inc. LT3992EUH#PBF
- Part No.:
- LT3992EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3992EUH#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,657
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Product details
Overview
LT3992EUH#PBF from Analog Devices (formerly Linear Technology) is a monolithic dual-channel current-mode PWM step-down DC/DC regulator with two integrated 4.6A NPN power switches, 3V–60V input range, independent channel control (SHDN, FB, SS, ILIM, UVLO), and antiphase 180° switching at up to 2MHz for reduced output ripple. It delivers up to 3A per channel in a 5mm × 5mm QFN package and is used in automotive front-end power supplies requiring precise voltage tracking and sequencing.
For engineers reviewing the LT3992EUH#PBF datasheet, LT3992EUH#PBF pinout, LT3992EUH#PBF application, or LT3992EUH#PBF equivalent, key selection considerations include independent programmable current limit (1.8A–4.8A), die temperature monitoring (TJ pin), synchronized clock output (CLKOUT), 95% max duty cycle for low dropout, and FMEA-compliant operation in harsh environments.
Technical Context
The LT3992EUH#PBF implements dual independent current-mode control loops with internal slope compensation, where each channel's peak inductor current is set by ILIM voltage (0.5V–1.0V → 1.8A–4.8A) and regulated via VC error amplifier output. The master oscillator (250kHz–2MHz) is either resistor-programmed on RT/SYNC or externally synchronized, with channel 1 frequency optionally divided by 1/2/4/8 via DIV pin while maintaining strict 180° phase shift between channels.
Antiphase operation reduces input capacitor RMS current and output voltage ripple; CLKOUT provides a synchronized square wave (0V–2.5V) for multi-regulator coordination; TJ pin delivers 250mV at 25°C with 10mV/°C slope for real-time junction temperature monitoring; and independent CMPI/CMPO pins enable per-channel power-good signaling with 725mV threshold and 80mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Output Current per Channel | Up to 3A - sustained delivery enabled by internal 4.6A NPN switches and thermal design with exposed pad. |
| Switching Frequency Range | 250kHz to 2MHz - programmable via RT/SYNC resistor or external clock; enables optimization of size vs. efficiency. |
| Feedback Reference Voltage | 806mV ±18mV - high-accuracy reference ensures tight output regulation across temperature and load. |
| Max Duty Cycle | 95% - minimizes dropout in high-VIN-to-low-VOUT applications such as 48V-to-5V conversion. |
| Quiescent Current (Dual Shutdown) | <10µA - ultra-low standby power suitable for always-on automotive modules. |
| Junction Temp Monitoring | TJ pin outputs 250mV at 25°C, +10mV/°C - enables system-level thermal protection without external sensor. |
Pinout & Package
LT3992EUH#PBF uses a 32-lead 5mm × 5mm plastic QFN package with exposed thermal pad (Pin 33 = GND). The package is RoHS-compliant, lead-free, and rated for –40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1/2 | Boost capacitor drive | Provides gate drive above VIN to ensure full saturation of internal NPN switch; requires external ceramic capacitor to SW. |
| SW1/2 | Switch emitter node | Connection to inductor and external Schottky catch diode; experiences high dV/dt during turn-off. |
| FB1/2 | Error amplifier inverting input | Regulated to 806mV; sets output voltage via resistive divider; bias current flows out of pin. |
| ILIM1/2 | Peak current limit programming | 12µA internal current source to ground sets 0.5V–1.0V voltage → 1.8A–4.8A current limit range. |
| RT/SYNC | Oscillator frequency control | 12µA current source sets switching frequency (250kHz–2MHz); accepts external sync clock on rising edge. |
| DIV | Channel 1 frequency divider select | 12µA current source to ground sets voltage thresholds for ÷1/÷2/÷4/÷8 division of master clock. |
| CLKOUT | Synchronized clock output | 0V–2.5V square wave at master clock frequency; used to synchronize multiple LT3992 or other regulators. |
| TJ | Die temperature monitor | 250mV @ 25°C, +10mV/°C - enables real-time thermal feedback and overtemperature shutdown coordination. |
| SHDN1/2 | Independent channel enable | 1.32V threshold; SHDN1 must be active for both channels to operate; controls quiescent current reduction. |
| VIN1/VIN2 | Power inputs | VIN1 powers control circuitry and CH1 switch; VIN2 powers CH2 switch only; VIN1 ≥2.9V required for VIN2 operation. |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-channel control | Separate SHDN, FB, SS, ILIM, CMPI/CMPO, and UVLO pins allow asymmetric sequencing, tracking, and fault management. |
| Antiphase 180° switching | Reduces input capacitor RMS current by ~30% and output voltage ripple amplitude by ~50% versus in-phase operation. |
| Programmable current limit | 1.8A–4.8A range set by single resistor per channel - enables precise overcurrent protection without external sense resistors. |
| Flexible synchronization | RT/SYNC accepts external clock (250kHz–2MHz) with automatic slope compensation adjustment - maintains stability during sync mode. |
| Low-dropout enhancement | Switch remains on for multiple cycles when boost capacitor voltage permits - extends usable input range in high-duty-cycle applications. |
| FMEA-compliant packaging | 38-pin TSSOP variant (LT3992EFE#PBF) meets functional safety requirements; QFN variant optimized for thermal performance. |
Applications
| Automotive Front-End Power Supply | Industrial Distributed Regulation |
|---|---|
Use Scenario: 12V/48V battery-fed ECU powering microcontroller, CAN transceiver, and sensors with strict sequencing and low standby current. IC Role / Device Role / Timing Role: Dual-output buck controller generating 5V (CH1) and 3.3V (CH2) with independent soft-start, power-good signaling, and thermal monitoring. Use Value: Enables single-chip solution for ASIL-B compliant power domains with <10µA shutdown current and TJ-based thermal derating. | Use Scenario: Factory automation PLC with isolated I/O modules requiring tightly tracked 24V and 15V rails from 48V backplane. IC Role / Device Role / Timing Role: Dual synchronous buck regulator with antiphase switching and programmable current limits for rail-specific overload protection. Use Value: Reduces input capacitance by 40% and eliminates need for external current-sense amplifiers or discrete sequencing ICs. |
| Telecom Intermediate Bus Converter | Medical Imaging Power Sequencing |
Use Scenario: 48V intermediate bus supplying 12V and 5V to FPGA, ADC, and interface ICs in base station radio units. IC Role / Device Role / Timing Role: High-efficiency dual buck converter with 2MHz switching, CLKOUT synchronization, and independent UVLO thresholds. Use Value: Achieves >92% efficiency at 2A load with minimal board area; CLKOUT enables timing alignment across multiple power stages. | Use Scenario: MRI subsystem requiring precise 3.3V, 5V, and 12V rail sequencing with sub-millisecond timing accuracy and thermal margin monitoring. IC Role / Device Role / Timing Role: Dual-tracking regulator with SS1/SS2 tied for voltage ramp matching and TJ pin feeding system thermal manager. Use Value: Eliminates external sequencer IC and discrete temperature sensor; supports IEC 60601-1 thermal safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892-2EUH#PBF | Same 32-pin QFN package, 4.5V–60V input, but uses external MOSFETs (no internal switches); supports higher output current with discrete FET selection. | Requires external high-side/low-side MOSFETs and gate drivers; better suited for >5A/channel or high-temperature (>125°C) designs. | Select LTC3892-2EUH#PBF when higher efficiency at high load or custom FET optimization is required; not drop-in compatible due to different pin functions and no internal switches. |
| MPQ4436AGL-AEC1-P | Automotive-grade dual 3A buck (3.8V–60V), but fixed 2.2MHz frequency, no DIV/CLKOUT, no TJ monitor, and only one shared SHDN pin. | Lacks independent channel control, thermal monitoring, and synchronization features; limited to simpler tracking applications. | Choose MPQ4436AGL-AEC1-P for cost-sensitive AEC-Q100 Grade 1 automotive applications where antiphase, CLKOUT, and die temp monitoring are unnecessary. |
Compared with LTC3892-2EUH#PBF and MPQ4436AGL-AEC1-P, the LT3992EUH#PBF uniquely integrates dual 4.6A switches, per-channel programmable current limiting, antiphase CLKOUT synchronization, and die temperature sensing in a single 5mm × 5mm QFN - making it optimal for space-constrained, thermally aware, and functionally safe dual-rail systems.
Availability
LT3992EUH#PBF is available at Aetrix Electronics and suitable for automotive front-end power supplies, industrial distributed regulation, telecom intermediate bus converters, and medical imaging power sequencing requiring stable component supply and long-term lifecycle support.
Supply support for LT3992EUH#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LT3992EUH#PBF belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for robust, low-component-count DC/DC conversion in harsh environments including automotive, industrial, and medical systems.
FAQ
What is the maximum supported switching frequency for LT3992EUH#PBF?
The LT3992EUH#PBF supports a maximum switching frequency of 2.5MHz when the RT/SYNC pin voltage exceeds 950mV, typically achieved with a 100kΩ resistor to ground. At this frequency, minimum on-time (160ns) and off-time (200ns) constraints remain satisfied, enabling compact magnetics and high transient response in space-constrained applications. The LT3992EUH#PBF maintains stable operation and slope compensation integrity across the full 250kHz–2.5MHz range.
How does the LT3992EUH#PBF achieve antiphase switching between channels?
The LT3992EUH#PBF generates a master clock from the RT/SYNC oscillator and routes channel 2's clock with a fixed 180° phase delay relative to channel 1 - regardless of whether frequency is set by resistor or external sync signal. This hard-wired phase relationship is maintained across all operating conditions and temperature ranges, ensuring consistent input ripple cancellation. The LT3992EUH#PBF does not rely on feedback or calibration to sustain the 180° offset.
Can LT3992EUH#PBF outputs be paralleled for higher current?
Yes, the LT3992EUH#PBF supports output paralleling of CH1 and CH2 by connecting VOUT1 and VOUT2 together, provided identical inductors, output capacitors, and feedback dividers are used. The device's matched internal current sense and error amplifier offsets (±13mV FB offset) ensure balanced current sharing within ±10% under typical conditions. However, paralleling disables independent channel shutdown and tracking functionality - the LT3992EUH#PBF then operates as a single 6A regulator.
What is the purpose of the DIV pin on LT3992EUH#PBF?
The DIV pin on the LT3992EUH#PBF sets the frequency division ratio for channel 1 relative to the master oscillator: 0.5V selects ÷2, 1.0V selects ÷4, and 1.5V selects ÷8 - enabling optimization of magnetic size and efficiency trade-offs per channel. A 12µA internal current source pulls the DIV pin, so a single resistor to ground determines the voltage. The LT3992EUH#PBF maintains 180° phase shift between CH1 (divided) and CH2 (full frequency), preserving ripple cancellation benefits.
Does LT3992EUH#PBF support power-good signaling for each channel?
Yes, the LT3992EUH#PBF provides independent power-good signaling via CMPI1/CMPO1 and CMPI2/CMPO2 pins per channel. Each CMPI pin has a 725mV threshold (90% of 806mV FB reference) and 80mV hysteresis; when exceeded, the corresponding open-collector CMPO pin sinks current. CMPO1 and CMPO2 can be wire-OR'd to generate a single system-level PGOOD signal. This functionality is fully operational across the –40°C to +125°C range and is integral to the LT3992EUH#PBF's sequencing capability.
LT3992EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 57V
- Current - Output:
- 3A
- Frequency - Switching:
- 110kHz ~ 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LT3992EUH#PBF FAQ
1.How can I place an order for LT3992EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3992EUH#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 LT3992EUH#PBF reliable?
The price and inventory of LT3992EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3992EUH#PBF is usually 5 days.
3.What payment methods are accepted for LT3992EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3992EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3992EUH#PBF?
LT3992EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3992EUH#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 LT3992EUH#PBF?
For technical support, including LT3992EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3992EUH#PBF requirements.
6.How does Aetrix verify that LT3992EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LT3992EUH#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 LT3992EUH#PBF meets industry standards.
7.What is the process for return or replacement of LT3992EUH#PBF?
All LT3992EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3992EUH#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 LT3992EUH#PBF part is unused and in its original packaging.
Return procedure for LT3992EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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