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Analog Devices Inc. LT3992IFE#TRPBF
- Part No.:
- LT3992IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3992IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,579
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Product details
Overview
LT3992IFE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic dual-channel current-mode PWM step-down DC/DC converter with two internal 4.6A NPN power switches, operating from 3V to 60V input, delivering up to 3A per channel, and featuring independent shutdown, soft-start, UVLO, and programmable current limit per channel - used in automotive distributed power rails and industrial 2-stage multi-output supplies.
For engineers reviewing the LT3992IFE#TRPBF datasheet, LT3992IFE#TRPBF pinout, LT3992IFE#TRPBF application, or LT3992IFE#TRPBF equivalent, key selection criteria include its 38-lead TSSOP exposed-pad package, –40°C to 125°C junction temperature rating, antiphase 180° switching for ripple reduction, and dual-channel synchronization via RT/SYNC and DIV pins.
Technical Context
The LT3992IFE#TRPBF implements independent current-mode control per channel with cycle-by-cycle peak current limiting, internal slope compensation, and dropout enhancement enabling >95% duty cycle operation. Each channel features dedicated error amplifiers (gm = 350 µMho typ), 806 mV feedback reference, and programmable soft-start via external capacitor.
It supports flexible frequency configuration: internal oscillator (250 kHz–2 MHz) set by RT/SYNC resistor, external clock synchronization (250 kHz–2 MHz), and channel 1 frequency division (×1/2/4/8) via DIV pin. Antiphase operation between channels is maintained across all modes, reducing input/output ripple and EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range industrial and automotive battery inputs including 12V, 24V, 36V, 48V, and 60V systems. |
| Output Current per Channel | Up to 3A - enabled by internal 4.6A NPN switches with 325 mV saturation voltage at 3A, minimizing conduction loss. |
| Switching Frequency Range | 250 kHz to 2 MHz - adjustable via RT/SYNC resistor or external clock; supports compact magnetics and low-noise design. |
| Feedback Reference Voltage | 806 mV ±13 mV (CH1–CH2 offset) - high-accuracy regulation with tight tracking for dual-rail sequencing. |
| Quiescent Current (Dual Shutdown) | <10 µA - achieved when both SHDN pins are low, enabling ultra-low-power standby in battery-critical systems. |
| Thermal Monitoring Output | TJ pin outputs 250 mV at 25°C with 10 mV/°C slope - enables real-time die temperature monitoring without external sensor. |
| Package & Thermal Resistance | 38-lead TSSOP with exposed pad; θJA = 17.5°C/W - optimized for high-power density and thermal reliability in constrained PCB layouts. |
Pinout & Package
LT3992IFE#TRPBF uses a 38-lead plastic TSSOP package with exposed thermal pad (Pin 39 = GND). The exposed pad must be soldered to PCB copper for thermal performance and electrical grounding. Pin count and layout match the FE-grade variant specified in Linear Technology's official ordering table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 39) | Power and signal ground reference | Exposed thermal pad; sole ground connection for both channels - must be soldered to large copper area for θJC = 10°C/W. |
| VIN1 (Pin 25) | Main supply input & channel 1 collector | Powers internal bias circuitry and channel 1 switch; requires local 4.7µF ceramic decoupling; UVLO threshold = 2.9V. |
| VIN2 (Pin 20) | Channel 2 supply input & collector | Requires VIN1 > 2.9V to operate; powers only channel 2 output stage; decoupling critical due to high dI/dt. |
| SHDN1/SHDN2 (Pins 24/18) | Independent channel enable control | SHDN1 must be high for any operation; SHDN2 enables/disables channel 2 only; threshold = 1.32V. |
| FB1/FB2 (Pins 12/10) | Negative input to error amplifier | Regulated to 806 mV; bias current flows out; used with resistive divider to set VOUT; CH1–CH2 offset ≤ ±13 mV. |
| RT/SYNC (Pin 27) | Oscillator frequency control / sync input | Drives internal 12 µA current source; sets fSW from 250 kHz–2 MHz; accepts external clock on rising edge. |
| DIV (Pin 26) | Channel 1 frequency divider select | Internal 12 µA current source; resistor-to-ground sets voltage for ×1/2/4/8 division of master clock frequency. |
| CLKOUT (Pin 28) | Synchronized clock output | 0V–2.5V square wave; phase-aligned to channel 1; enables synchronization of multiple LT3992 or other regulators. |
| TJ (Pin 29) | Junction temperature monitor | Analog voltage output: 250 mV @ 25°C, +10 mV/°C - enables closed-loop thermal management without external IC. |
| ILIM1/ILIM2 (Pins 23/16) | Peak inductor current programming | Internal 12 µA current source; resistor-to-ground sets ILIM voltage (0.5V–1V) → 1.8A–4.8A current limit range. |
Key Features
| Feature | Design Value |
|---|---|
| Antiphase dual-channel switching | Maintains 180° phase shift across full frequency range (250 kHz–2 MHz), reducing input/output ripple and EMI filter size. |
| Independent channel control | Separate VIN, SHDN, FB, SS, ILIM, CMPI/CMPO, and VC pins per channel - enables asymmetric rail generation and sequencing. |
| Programmable current limit | Per-channel peak current set via ILIM pin (0.5V–1V → 1.8A–4.8A); supports robust overload protection without external sense resistors. |
| Dropout enhancement | Supports >95% duty cycle by holding switch on across multiple cycles until boost capacitor recharge is required. |
| Flexible synchronization architecture | RT/SYNC accepts external clock (250 kHz–2 MHz) or sets internal oscillator; DIV pin enables channel-specific frequency scaling. |
| FMEA-compliant package | 38-pin TSSOP with exposed pad meets functional safety requirements for automotive and industrial applications. |
Applications
| Automotive ADAS Power Supply | Industrial Dual-Rail Sequencing |
|---|---|
|
Use Scenario: Powering radar sensor SoCs requiring tightly tracked 12V and 5V rails with precise startup timing and thermal monitoring. IC Role / Device Role: Dual-channel buck controller managing independent 12V@2A and 5V@3A outputs with antiphase switching to minimize EMI in RF-sensitive zones. Use Value: Eliminates need for two discrete regulators; TJ pin enables real-time die temperature feedback for ASIL-B compliant thermal derating. |
Use Scenario: Generating sequenced 5V and 3.3V supplies for FPGA-based PLC modules with strict power-up order and fault reporting. IC Role / Device Role: Independent channel control via SHDN1/SHDN2 and CMPI/CMPO pins enables hardware-defined power-on reset and rail validation. Use Value: Built-in power-good comparators (CMPI/CMPO) reduce BOM count by replacing external supervisor ICs. |
| Telecom Distributed Regulation | Medical Imaging Subsystem |
|
Use Scenario: Local point-of-load conversion from 48V backplane to 12V and 3.3V for optical transceiver modules in 5G base stations. IC Role / Device Role: High-input-voltage capability (up to 60V) and 2MHz switching enable small 12V/3.3V converters with minimal board space. Use Value: CLKOUT pin synchronizes multiple LT3992 devices across a board, eliminating beat-frequency noise in sensitive analog front-ends. |
Use Scenario: Powering CCD/CMOS image sensors and ADCs in portable ultrasound units requiring low-noise, low-quiescent-current dual supplies. IC Role / Device Role: <10 µA shutdown current and soft-start-controlled ramp-up prevent inrush-induced voltage droop during battery-powered operation. Use Value: Independent SS1/SS2 pins allow programmable delay between 5V and 3.3V rails to meet sensor initialization timing requirements. |
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 |
|---|---|---|---|
| LTC3892EFE#TRPBF | Higher Vin max (60V), but fixed 2-phase (no DIV), no TJ pin, no CMPO, lower Iq in shutdown (2.5 µA). | Optimized for high-efficiency single-frequency 2-phase operation; lacks per-channel sequencing and thermal monitoring. | Choose for cost-sensitive, non-thermal-critical 2-phase apps where channel independence is unnecessary. |
| MPQ4332GR-AEC1 | Automotive AEC-Q200 qualified, 36V max Vin, integrated MOSFETs, no DIV/CLKOUT/TJ, smaller QFN package. | Targeted at space-constrained automotive ECUs; lacks antiphase flexibility, external sync, and thermal diagnostics. | Choose for AEC-Q200 compliance and footprint reduction where full LT3992 feature set is not required. |
Compared with LTC3892EFE#TRPBF and MPQ4332GR-AEC1, the LT3992IFE#TRPBF uniquely combines per-channel programmability, antiphase/division flexibility, integrated thermal sensing, and FMEA-ready packaging - making it optimal for complex, thermally aware, multi-rail industrial and ADAS designs.
Availability
LT3992IFE#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS subsystems, industrial PLC power rails, telecom 48V PoL conversion, and medical imaging equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3992IFE#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LT® series. Linear's legacy expertise in precision power management remains core to ADI's high-reliability analog portfolio.
The LT3992IFE#TRPBF belongs to Linear's high-voltage dual buck regulator family, designed specifically for demanding automotive, industrial, and telecom applications requiring independent rail control, thermal awareness, and EMI-conscious layout.
FAQ
What is the maximum input voltage supported by the LT3992IFE#TRPBF?
The LT3992IFE#TRPBF supports an absolute maximum input voltage of 60V on both VIN1 and VIN2 pins. Its operational input range is specified from 3V to 60V, enabling direct use with 12V, 24V, 36V, 48V, and 60V industrial and automotive battery systems. This wide range is maintained across the full –40°C to 125°C junction temperature range.
Does the LT3992IFE#TRPBF support independent output voltage sequencing?
Yes, the LT3992IFE#TRPBF supports hardware-based sequencing via separate SHDN1 and SHDN2 pins, independent soft-start (SS1/SS2) capacitors, and configurable power-good signals (CMPI1/CMPO1 and CMPI2/CMPO2). Connecting SS1 and SS2 through matched RC networks ensures precise tracking, while independent control allows staggered startup for FPGA or processor core/I/O rail requirements.
How does the DIV pin affect channel 1 switching frequency in the LT3992IFE#TRPBF?
The DIV pin on the LT3992IFE#TRPBF sets the division ratio (×1, ×2, ×4, or ×8) of channel 1's switching frequency relative to the master clock derived from RT/SYNC. An internal 12 µA current source pulls the DIV pin; a resistor to ground sets the voltage (0.5V, 1.0V, or 1.5V thresholds), selecting the ratio. This allows channel 1 to run at lower frequency than channel 2 - optimizing efficiency and component size for asymmetric loads.
Can the LT3992IFE#TRPBF be synchronized to an external clock source?
Yes, the LT3992IFE#TRPBF can be synchronized to an external clock applied to the RT/SYNC pin. It locks to rising edges of input clocks ranging from 250 kHz to 2 MHz. During sync mode, slope compensation automatically adjusts to prevent subharmonic oscillation, and the 180° antiphase relationship between channels is preserved. CLKOUT provides a buffered, phase-aligned output for cascading synchronization.
What thermal monitoring capability does the LT3992IFE#TRPBF provide?
The LT3992IFE#TRPBF provides die temperature monitoring via the TJ pin, which outputs a voltage proportional to junction temperature: 250 mV at 25°C with a linear slope of 10 mV/°C. This analog output enables real-time thermal feedback without external sensors and supports closed-loop derating or fault detection in safety-critical applications such as automotive ADAS and industrial controls.
LT3992IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 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:
- 38-TSSOP-EP
LT3992IFE#TRPBF FAQ
1.How can I place an order for LT3992IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3992IFE#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 LT3992IFE#TRPBF reliable?
The price and inventory of LT3992IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3992IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3992IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3992IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3992IFE#TRPBF?
LT3992IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3992IFE#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 LT3992IFE#TRPBF?
For technical support, including LT3992IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3992IFE#TRPBF requirements.
6.How does Aetrix verify that LT3992IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3992IFE#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 LT3992IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3992IFE#TRPBF?
All LT3992IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3992IFE#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 LT3992IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3992IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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