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Analog Devices Inc. LT3992IUH#TRPBF
- Part No.:
- LT3992IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3992IUH#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,915
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Product details
Overview
LT3992IUH#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 delivers up to 3A per channel in automotive and industrial distributed power systems requiring tight tracking and low quiescent current.
For engineers reviewing the LT3992IUH#TRPBF datasheet, LT3992IUH#TRPBF pinout, LT3992IUH#TRPBF application, or LT3992IUH#TRPBF equivalent, key selection criteria include its dual-channel programmable current limit (1.8A–4.8A), die temperature monitoring (TJ pin), 180° phase-shifted operation for ripple reduction, and resistor- or clock-synchronized frequency tuning from 250kHz to 2MHz.
Technical Context
The LT3992IUH#TRPBF implements independent current-mode control per channel with internal slope compensation, cycle-by-cycle peak current limiting, and dropout enhancement via multi-cycle on-time extension. Its master oscillator supports either internal RT/SYNC resistor programming or external clock synchronization, with DIV pin enabling 1×/2×/4×/8× frequency division for Channel 1 while maintaining fixed 180° phase offset versus Channel 2.
Each channel features dedicated error amplifiers (gm = 350 µMho typ), programmable soft-start (13.5 µA sink/source), independent UVLO (2.9V typ), and power-good comparators (725 mV threshold, 80 mV hysteresis) referenced to 806 mV feedback voltage. The TJ pin provides a calibrated 10 mV/°C analog temperature output (250 mV at 25°C).
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 - enabled by internal 4.6A NPN switches and thermal design with exposed pad QFN package. |
| Switching Frequency Range | 250kHz to 2MHz - adjustable via RT/SYNC resistor or external clock; enables optimization of size vs. efficiency. |
| Feedback Reference Voltage | 806mV ±18mV - precise regulation point with <13mV CH1–CH2 offset ensures accurate tracking. |
| Quiescent Current (Dual Shutdown) | <10µA - achieved by disabling both channels via SHDN pins, critical for battery-backed systems. |
| Duty Cycle Maximum | 95% - supports high-input-to-output ratios (e.g., 60V→5.7V) with minimal dropout loss. |
| Junction Temperature Range | –40°C to +125°C - specified and guaranteed for industrial and automotive applications. |
Pinout & Package
LT3992IUH#TRPBF uses a 32-lead 5mm × 5mm plastic QFN package with exposed thermal pad (Pin 33 = GND). The package supports high-power dissipation (θJC = 7.3°C/W) and requires soldering the exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BST1/2 | Bootstrap supply for NPN gate drive | Enables full saturation of internal NPN switch; requires external ceramic capacitor to SW node. |
| SW1/2 | Switch emitter output | Connects to inductor and Schottky catch diode; high dV/dt during turn-off demands local layout care. |
| FB1/2 | Negative input to error amplifier | Regulated to 806mV; sets output voltage via resistive divider; bias current flows out (≤300nA). |
| ILIM1/2 | Peak current limit programming | 12µA internal current source into external resistor sets 1.8A–4.8A current limit range. |
| RT/SYNC | Oscillator frequency control / sync input | Resistor-to-GND sets 250kHz–2MHz; external clock synchronizes rising edge with automatic slope compensation. |
| DIV | Channel 1 frequency divider select | 12µA current source into resistor selects 1×/2×/4×/8× division ratio relative to master clock. |
| TJ | Analog junction temperature output | 250mV at 25°C, 10mV/°C slope - enables real-time thermal monitoring without external sensor. |
| CLKOUT | Synchronized clock output | 0V–2.5V square wave at master clock frequency; used to synchronize multiple LT3992 or other regulators. |
| SHDN1/2 | Independent channel enable | 1.32V threshold; SHDN1 must be active for Channel 2 operation; dual shutdown reduces IQ to <10µA. |
| CMPI1/2 / CMPO1/2 | Power-good comparator input/output | CMPI monitors FB; CMPO sinks current when output drops below 90% of target - supports OR'd PG signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Antiphase 180° switching | Reduces input/output capacitor RMS current and voltage ripple by canceling harmonic components between channels. |
| Independent channel sequencing | Separate SHDN, SS, and UVLO per channel enables flexible power-up/down order for FPGA, ASIC, or multi-rail processors. |
| Programmable current limit | Adjustable 1.8A–4.8A per channel via ILIM resistor - allows optimization for inductor size, thermal margin, and fault robustness. |
| Dual-channel thermal monitoring | Single TJ pin provides die temperature data for both channels - simplifies thermal management in compact layouts. |
| Dropout enhancement mode | Extends switch on-time across multiple cycles when boost capacitor voltage falls - maintains regulation down to VIN – VOUT ≈ 1.6V. |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail 12V/5V supply for camera ECU with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Primary dual-buck regulator delivering regulated 12V (CH1) and 5V (CH2) from 12V–48V battery rail; antiphase operation minimizes conducted EMI. Use Value: 180° phase shift cuts input capacitor RMS current by ~30%, reducing size and heat; TJ pin enables dynamic derating under hood temperature rise. | Use Scenario: Distributed 5V/3.3V power for isolated digital I/O cards in modular control cabinets. IC Role / Device Role / Timing Role: Compact dual-output buck controller powering microcontroller and isolated interface ICs; independent SHDN allows staggered wake-up. Use Value: Independent soft-start (SS1/SS2) prevents inrush overload on shared 24V backplane; 60V max input handles load-dump transients. |
| Telecom Remote Radio Unit | Medical Imaging Sensor Array |
Use Scenario: 5V/3.3V conversion from 48V PoE-derived supply in space-constrained RRH enclosure. IC Role / Device Role / Timing Role: High-efficiency dual buck managing RF front-end and baseband logic rails; synchronized to system clock via RT/SYNC. Use Value: External clock sync eliminates beat frequencies with RF LO; 2MHz operation shrinks magnetics by >50% vs. 500kHz designs. | Use Scenario: Low-noise, thermally stable dual supply for CMOS image sensor bias and ADC reference in portable ultrasound. IC Role / Device Role / Timing Role: Precision-tracking buck pair delivering matched 3.3V/2.5V outputs with <13mV inter-channel FB offset. Use Value: Tight FB matching (<±13mV) ensures sub-0.5% output tracking error; TJ monitoring prevents thermal drift-induced gain error in analog chain. |
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 |
|---|---|---|---|
| LT8640SEUDD#TRPBF | Single-channel, 6A, 3V–42V, Silent Switcher 2 architecture; lower EMI, no DIV/CLKOUT; 40-pin 6×6 QFN. | Requires two devices for dual-rail; superior EMI performance but lacks antiphase ripple cancellation and channel coordination. | Select when ultra-low EMI is mandatory and dual-channel coordination is not required. |
| TPS54560QDGQRQ1 | Single-channel, 5A, 3.5V–60V, integrated FET; no independent channel control, no TJ output, no CLKOUT; 10-pin MSOP. | Lower integration density; no antiphase capability or thermal monitoring; simpler BOM but limited sequencing flexibility. | Select for cost-sensitive, single-rail automotive applications where dual-channel coordination is unnecessary. |
Compared with LT8640S and TPS54560Q, the LT3992IUH#TRPBF uniquely integrates dual independent current-mode controllers with antiphase timing, die temperature sensing, and multi-frequency synchronization-enabling compact, thermally aware, and EMI-optimized dual-rail designs unachievable with single-channel alternatives.
Availability
LT3992IUH#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS systems, industrial PLCs, telecom remote radio units, and medical imaging equipment requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for LT3992IUH#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 power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3992 belongs to ADI's high-voltage monolithic buck regulator product line, designed specifically for demanding industrial, automotive, and telecom applications requiring wide input range, dual-rail coordination, and robust thermal management.
FAQ
What is the guaranteed operating junction temperature range for the LT3992IUH#TRPBF?
The LT3992IUH#TRPBF is fully specified and guaranteed over the –40°C to +125°C junction temperature range. This rating is validated per Analog Devices' industrial-grade qualification standards and applies to all electrical parameters in the datasheet, including feedback accuracy, current limit tolerance, and thermal shutdown behavior. The LT3992IUH#TRPBF's exposed-pad QFN package and internal TJ sensor support reliable operation in harsh thermal environments typical of automotive engine compartments and industrial control cabinets.
How does the LT3992IUH#TRPBF achieve antiphase 180° switching between channels?
The LT3992IUH#TRPBF generates a master clock signal and routes it to Channel 2 directly while applying a fixed 180° phase inversion to Channel 1. This architecture ensures consistent antiphase alignment across the full 250kHz–2MHz frequency range, regardless of whether the oscillator is set by the RT/SYNC resistor or synchronized to an external clock. The LT3992IUH#TRPBF maintains this relationship even during frequency changes or startup, enabling predictable input ripple cancellation and reduced capacitor stress without external timing circuitry.
Can the LT3992IUH#TRPBF operate with only one channel enabled?
Yes, the LT3992IUH#TRPBF supports independent channel operation: SHDN1 controls both channels' bias circuitry, while SHDN2 enables or disables Channel 2 only. With SHDN1 high and SHDN2 low, Channel 1 operates normally while Channel 2 remains in ultra-low-quiescent-current shutdown (<1µA). This mode is useful for partial-system wake-up or asymmetric rail requirements. The LT3992IUH#TRPBF retains full functionality-including soft-start, current limit, and thermal monitoring-for the active channel.
What is the purpose of the DIV pin on the LT3992IUH#TRPBF, and how is it configured?
The DIV pin on the LT3992IUH#TRPBF selects the frequency division ratio for Channel 1 relative to the master clock: 1×, 2×, 4×, or 8×. An internal 12µA current source pulls the pin high; connecting a resistor from DIV to GND sets the voltage, which the LT3992IUH#TRPBF decodes into the corresponding ratio. For example, 50kΩ yields ~0.5V (÷2), 100kΩ yields ~1.0V (÷4). This feature allows Channel 1 to run at lower frequency for higher efficiency or larger inductors while Channel 2 maintains higher frequency for tighter transient response-all within a single IC.
Does the LT3992IUH#TRPBF support output voltage tracking, and how is it implemented?
Yes, the LT3992IUH#TRPBF supports flexible output voltage tracking via its independent soft-start (SS1/SS2) and feedback (FB1/FB2) pins. Connecting SS1 and SS2 together forces both outputs to ramp simultaneously, achieving tight voltage tracking during startup. Alternatively, cascading FB2 to FB1 through a resistor divider enables follower-mode tracking where VOUT2 tracks VOUT1 with programmable offset. The LT3992IUH#TRPBF's matched 806mV reference and <13mV inter-channel FB offset ensure tracking accuracy better than 0.5% across temperature and load, critical for FPGA core/I/O rail sequencing.
LT3992IUH#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)
LT3992IUH#TRPBF FAQ
1.How can I place an order for LT3992IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3992IUH#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 LT3992IUH#TRPBF reliable?
The price and inventory of LT3992IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3992IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3992IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3992IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3992IUH#TRPBF?
LT3992IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3992IUH#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 LT3992IUH#TRPBF?
For technical support, including LT3992IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3992IUH#TRPBF requirements.
6.How does Aetrix verify that LT3992IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3992IUH#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 LT3992IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3992IUH#TRPBF?
All LT3992IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3992IUH#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 LT3992IUH#TRPBF part is unused and in its original packaging.
Return procedure for LT3992IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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