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Analog Devices Inc. LT3992EUH#TRPBF
- Part No.:
- LT3992EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3992EUH#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,664
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Product details
Overview
LT3992EUH#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic dual-channel current-mode PWM step-down DC/DC converter with two integrated 4.6A NPN power switches, 3V–60V input range, independent channel control (SHDN, FB, SS, ILIM, CMPI/CMPO), and antiphase 180° switching at up to 2MHz. It enables compact, high-efficiency 12V/5V two-stage regulation in automotive and industrial power systems.
For engineers reviewing the LT3992EUH#TRPBF datasheet, LT3992EUH#TRPBF pinout, LT3992EUH#TRPBF application, or LT3992EUH#TRPBF equivalent, key selection criteria include per-channel programmable current limit (1.8A–4.8A), die temperature monitoring (TJ pin), synchronized clock output (CLKOUT), flexible frequency division (÷1/÷2/÷4/÷8), and FMEA-compliant operation in 5mm × 5mm QFN-32 package.
Technical Context
The LT3992EUH#TRPBF implements dual independent current-mode control loops with separate error amplifiers (gm = 350 µMho typ), cycle-by-cycle peak current sensing via internal sense resistors, and slope compensation automatically adjusted during external synchronization. Each channel features dedicated soft-start (13.5 µA typ source current), UVLO (2.9V typ), and power-good comparators (725 mV threshold, 80 mV hysteresis).
Its oscillator supports resistor-set fixed frequency (250 kHz–2 MHz) or external clock synchronization (250 kHz–2 MHz), with channel 1 phase-divided (÷1/÷2/÷4/÷8) while channel 2 maintains 180° antiphase relationship. Minimum on-time (160 ns) and off-time (200 ns) enable high duty-cycle operation down to 3V input with 95% max duty cycle capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range industrial, automotive, and telecom inputs without pre-regulation. |
| Output Current per Channel | Up to 3A continuous - enabled by internal 4.6A NPN switches and thermal design with θJC = 7.3°C/W. |
| Switching Frequency Range | 250 kHz to 2 MHz - adjustable via RT/SYNC resistor or external clock; supports optimized inductor size and EMI filtering. |
| Feedback Reference Voltage | 806 mV ±18 mV - precise regulation point for output voltage setting with <13 mV CH1–CH2 offset. |
| Quiescent Current (Dual Shutdown) | <10 µA - ultra-low standby power for battery-backed or always-on systems. |
| Junction Temperature Range | –40°C to 125°C - qualified for extended industrial and automotive under-hood applications. |
| Package | 32-pin 5mm × 5mm QFN with exposed pad - low thermal resistance and space-efficient layout. |
Pinout & Package
LT3992EUH#TRPBF is housed in a 32-lead 5mm × 5mm plastic QFN package with exposed thermal pad (Pin 33 = GND). The package requires soldering of the exposed pad to PCB ground plane for thermal and electrical integrity (θJC = 7.3°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BST1/BST2 | Bootstrap supply for NPN gate drive | Enables high-side NPN switch operation; must be decoupled with 0.1µF ceramic near each BST pin. |
| SW1/SW2 | Switch emitter node | Connects to inductor and Schottky catch diode; high dV/dt requires tight layout and local grounding. |
| FB1/FB2 | Negative input to error amplifier | Regulated to 806 mV; sets output voltage via external resistor divider; bias current flows out (≤300 nA). |
| ILIM1/ILIM2 | Peak current limit programming | 12 µA internal current source into resistor to ground sets 1.8A–4.8A current limit range. |
| RT/SYNC | Oscillator frequency control / sync input | Resistor-to-ground sets 250 kHz–2 MHz; external clock input synchronizes both channels on rising edge. |
| DIV | Channel 1 frequency divider select | 12 µA current source into resistor sets ÷1/÷2/÷4/÷8 ratio relative to 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 output | 250 mV at 25°C, 10 mV/°C slope; enables real-time thermal management without external sensor. |
| SHDN1/SHDN2 | Independent channel shutdown | 1.32 V threshold; SHDN1 must be active for channel 2 operation; disables respective channel and reduces IQ. |
| SS1/SS2 | Soft-start timing control | 13.5 µA typical source current charges external capacitor; enables controlled ramp-up and output tracking. |
| CMPI1/CMPI2 | Power-good comparator input | 725 mV threshold (90% of FB ref); monitors output regulation status for system sequencing. |
| CMPO1/CMPO2 | Open-collector power-good output | Sinks current when CMPI falls below threshold; can be wire-OR'd for combined PG signal. |
| VIN1/VIN2 | Channel power inputs | VIN1 powers internal bias circuits (min 2.9V required); VIN2 powers channel 2 output stage only. |
| GND | Common ground reference | Exposed pad (Pin 33) is sole GND connection; must be soldered to large copper area for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Antiphase 180° switching | Reduces input/output ripple amplitude and allows smaller bulk capacitors and EMI filters. |
| Independent channel programmability | Each channel has dedicated SHDN, SS, FB, ILIM, CMPI/CMPO, enabling complex sequencing and tracking. |
| Flexible frequency synchronization | Supports resistor-set or external clock (250 kHz–2 MHz) with automatic slope compensation adjustment. |
| Dual-channel current-mode control | Enables fast transient response, inherent current limiting, and stable loop compensation across load conditions. |
| Die temperature monitoring (TJ pin) | Provides analog voltage proportional to junction temperature (250 mV @ 25°C, 10 mV/°C) for thermal protection. |
| Low dropout operation | 95% maximum duty cycle and multi-cycle on-time extension improve minimum VIN-to-VOUT ratio. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail 12V/5V conversion from 12V–48V vehicle battery with cold-crank tolerance down to 3V. IC Role / Device Role / Timing Role: Primary dual-output buck controller managing independent sequencing, thermal monitoring, and EMI-constrained layout. Use Value: Antiphase switching cuts input ripple by >50%, reducing bulk capacitance and enabling compact 5mm × 5mm footprint in space-constrained head units. | Use Scenario: Distributed 5V/3.3V regulation across modular I/O cards with shared clock synchronization. IC Role / Device Role / Timing Role: Dual-channel regulator with CLKOUT-driven inter-card synchronization and per-channel fault reporting via CMPO pins. Use Value: Independent CMPI/CMPO per channel enables discrete power-good signaling for hot-swap I/O modules without external logic. |
| Medical Imaging Sensor Bias Supply | Telecom Remote Radio Unit (RRU) |
Use Scenario: Low-noise, thermally stable dual-bias supply for CCD/CMOS image sensors requiring precise voltage tracking. IC Role / Device Role / Timing Role: Precision tracking regulator using tied SS pins and matched FB dividers, with TJ feedback for derating at elevated ambient. Use Value: <13 mV CH1–CH2 FB offset and 0.01%/°C TJ drift ensure sub-0.5% output tracking over –40°C to 85°C operating range. | Use Scenario: High-reliability 24V-to-5V/3.3V conversion in outdoor RRU enclosures with wide temperature swing and vibration. IC Role / Device Role / Timing Role: FMEA-compliant dual buck controller with shutdown isolation, thermal foldback, and robust BST drive for harsh environments. Use Value: Exposed-pad QFN package with θJC = 7.3°C/W and integrated 4.6A switches eliminate external MOSFETs and reduce BOM count by 30%. |
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 |
|---|---|---|---|
| LTC3892EUF#PBF | Single-channel controller with external MOSFETs; no integrated switches; supports up to 60V input but requires external power stage. | Used where higher efficiency (>95%) or custom thermal management is needed; lacks integrated current limit and TJ monitoring. | Select when board-level thermal design demands discrete FETs or when >3A per rail is required beyond LT3992's 3A rating. |
| MPQ4332GSD-AEC1 | Automotive-grade dual 3A buck with 3.5V–36V input; integrated switches; no DIV pin, no CLKOUT, no TJ pin; fixed 500kHz/2.2MHz options. | Targeted for AEC-Q100 Grade 1 automotive; lacks frequency division, die temp monitoring, and independent CMPO outputs. | Select for cost-sensitive automotive body electronics where full feature set of LT3992EUH#TRPBF is not required. |
Compared with LTC3892EUF#PBF and MPQ4332GSD-AEC1, the LT3992EUH#TRPBF uniquely combines integrated 4.6A switches, per-channel frequency division (÷1/÷2/÷4/÷8), synchronized CLKOUT, and analog die temperature output (TJ) in a single 5mm × 5mm QFN-enabling compact, thermally aware, and EMI-optimized dual-rail designs without external components.
Availability
LT3992EUH#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and medical imaging sensor bias supplies requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LT3992EUH#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3992EUH#TRPBF belongs to ADI's Power by Linear™ family of high-voltage monolithic DC/DC converters, designed specifically for demanding industrial, automotive, and medical applications requiring wide VIN, precision tracking, and robust thermal management.
FAQ
What is the maximum supported switching frequency for LT3992EUH#TRPBF?
The LT3992EUH#TRPBF supports a maximum switching frequency of 2.5 MHz when configured with an external RT/SYNC resistor (RRT/SYNC = 100 kΩ), or up to 2 MHz when synchronized to an external clock. Its minimum frequency is 250 kHz in resistor mode, and it maintains 180° antiphase operation across the full range. The LT3992EUH#TRPBF also provides a CLKOUT pin for synchronizing other regulators to its master clock.
How does the DIV pin function in LT3992EUH#TRPBF?
The DIV pin on the LT3992EUH#TRPBF sets the frequency division ratio for channel 1 relative to the master clock (set by RT/SYNC). An internal 12 µA current source drives a resistor to ground, generating voltages that select ÷1, ÷2, ÷4, or ÷8 division. For example, 0.5 V at DIV selects ÷2, allowing channel 1 to run at half the master frequency while channel 2 remains at full frequency with 180° phase shift. This optimizes component size and ripple cancellation in LT3992EUH#TRPBF designs.
Can LT3992EUH#TRPBF operate with only one channel enabled?
Yes, the LT3992EUH#TRPBF supports independent channel operation: SHDN1 controls both channels' bias circuitry, but SHDN2 can disable only channel 2 while channel 1 remains active. When SHDN1 is pulled low, total quiescent current drops to <10 µA. Channel 2 requires VIN1 ≥ 2.9V to operate, but channel 1 can function standalone. This flexibility enables partial-power modes and fault-isolation strategies in LT3992EUH#TRPBF-based power architectures.
What is the purpose of the TJ pin on LT3992EUH#TRPBF?
The TJ pin on the LT3992EUH#TRPBF outputs an analog voltage proportional to die junction temperature: 250 mV at 25°C with a slope of 10 mV/°C. It enables real-time thermal monitoring without external sensors, supporting dynamic thermal derating, fan control, or system shutdown before reaching 125°C maximum junction temperature. The TJ output is calibrated and specified over –40°C to 125°C, and its accuracy is maintained independently of load or input conditions in the LT3992EUH#TRPBF.
Does LT3992EUH#TRPBF support output voltage tracking between channels?
Yes, the LT3992EUH#TRPBF supports precise output voltage tracking via its independent soft-start (SS1/SS2) and feedback (FB1/FB2) pins. Connecting SS1 and SS2 together ensures simultaneous ramp-up, while matching FB resistor dividers leverages the <13 mV CH1–CH2 feedback offset to achieve sub-0.5% tracking accuracy over temperature. This capability is explicitly validated in the LT3992EUH#TRPBF datasheet for applications like dual-core processors or ADC/DAC bias rails requiring tightly coupled supplies.
LT3992EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT3992EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3992EUH#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 LT3992EUH#TRPBF reliable?
The price and inventory of LT3992EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3992EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3992EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3992EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3992EUH#TRPBF?
LT3992EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3992EUH#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 LT3992EUH#TRPBF?
For technical support, including LT3992EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3992EUH#TRPBF requirements.
6.How does Aetrix verify that LT3992EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3992EUH#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 LT3992EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3992EUH#TRPBF?
All LT3992EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3992EUH#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 LT3992EUH#TRPBF part is unused and in its original packaging.
Return procedure for LT3992EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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