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Analog Devices Inc. LT3992IFE#PBF
- Part No.:
- LT3992IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3992IFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,267
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Product details
Overview
LT3992IFE#PBF 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, wide 3V–60V input range, independent channel control (SHDN, FB, SS, ILIM, UVLO), and antiphase 180° switching for ripple reduction. It delivers up to 3A per channel and supports tracking, sequencing, and paralleling in automotive and industrial power systems.
For engineers reviewing the LT3992IFE#PBF datasheet, LT3992IFE#PBF pinout, LT3992IFE#PBF application, or LT3992IFE#PBF equivalent, key selection criteria include its 38-lead TSSOP exposed-pad package, –40°C to 125°C operating junction temperature, programmable 250kHz–2MHz switching frequency with synchronization capability, and dual-channel independent current limit (1.8A–4.8A) via ILIM pins.
Technical Context
The LT3992IFE#PBF implements independent current-mode control per channel using internal sense resistors, error amplifiers with 350µMho transconductance, and cycle-by-cycle peak current limiting. Each channel features dedicated soft-start (13.5µA typical source current), feedback reference (806mV ±18mV), and comparator-based power-good signaling (CMPI/CMPO).
Its oscillator supports resistor-set (RT/SYNC) or external clock synchronization with automatic slope compensation adjustment; channel 1 frequency can be divided by 1, 2, 4, or 8 via the DIV pin while maintaining fixed 180° phase shift relative to channel 2. The TJ pin provides die temperature monitoring (250mV at 25°C, 10mV/°C slope).
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 - enabled by internal 4.6A NPN switches and thermal design with θJC = 10°C/W |
| 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 - precise regulation point enabling accurate output voltage setting with standard resistor dividers |
| Quiescent Current (Dual Shutdown) | <10µA - achieved by disabling both channels via SHDN pins, critical for low-power standby modes |
| Junction Temperature Range | –40°C to 125°C - validated operation across extended industrial and automotive ambient conditions |
| Package Type | 38-lead plastic TSSOP with exposed pad - FMEA-compliant layout supporting robust thermal dissipation and PCB-level reliability |
Pinout & Package
LT3992IFE#PBF uses a 38-lead plastic TSSOP package with exposed pad (pin 39 = GND), optimized for thermal performance (θJA = 17.5°C/W). The exposed pad must be soldered to PCB ground plane for safe operation and thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1/BST2 | Bootstrap supply for NPN base drive | Enables high-side NPN switch saturation; requires external capacitor between BSTx and SWx |
| SW1/SW2 | Emitter of internal NPN power switch | High dV/dt node requiring local Schottky catch diode to GND and tight VIN decoupling |
| FB1/FB2 | Negative input of error amplifier | Regulated to 806mV; sets output voltage via external resistor divider |
| ILIM1/ILIM2 | Peak current limit programming input | 12µA internal current source; 42.2k–120k resistor sets 1.8A–4.8A current limit |
| SHDN1/SHDN2 | Channel enable/disable control | SHDN1 must be high for both channels to operate; SHDN2 independently disables channel 2 |
| RT/SYNC | Oscillator frequency set or sync input | 12µA current source for resistor programming; accepts external clock for synchronization |
| DIV | Channel 1 frequency divider select | 12µA current source; resistor to GND selects ÷1, ÷2, ÷4, or ÷8 division ratio |
| CLKOUT | Synchronized master clock output | 0V–2.5V square wave at master frequency; used to synchronize multiple LT3992 devices |
| TJ | Die temperature monitor output | 250mV at 25°C, 10mV/°C slope; enables real-time thermal protection and margining |
| GND (Pin 39) | Power and signal ground reference | Exposed pad is sole ground connection; must be soldered to large PCB copper area |
Key Features
| Feature | Design Value |
|---|---|
| Independent channel control | Separate SHDN, SS, FB, ILIM, CMPI/CMPO, and UVLO per channel enable flexible sequencing and fault isolation |
| Antiphase 180° switching | Reduces input/output capacitor RMS current and voltage ripple, lowering component count and EMI |
| Programmable current limit | 1.8A–4.8A per channel via ILIM pin resistor - supports diverse load requirements without redesign |
| Dropout enhancement | 95% max duty cycle with multi-cycle on-time - maintains regulation at low VIN–VOUT differentials |
| Thermal monitoring | Integrated TJ pin with ±100mV accuracy over –40°C to 125°C - enables system-level thermal management |
| FMEA-compliant packaging | 38-lead TSSOP with exposed pad meets functional safety requirements for automotive and industrial applications |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for display controller (12V) and SoC core (5V) in head-unit systems with cold-crank (4.5V) and load-dump (60V) transients. IC Role / Device Role / Timing Role: Primary dual-output buck regulator providing independent, sequenced, and tracked outputs with UVLO and thermal shutdown. Use Value: Eliminates need for discrete sequencing ICs; antiphase operation reduces input capacitor stress during transient events. | Use Scenario: Distributed 5V and 3.3V rails for analog sensor front-ends and digital logic in modular automation controllers. IC Role / Device Role / Timing Role: Compact dual-channel regulator with independent current limits and power-good signaling per rail. Use Value: Enables per-rail fault detection and graceful shutdown; ILIM programming allows matching to sensor or FPGA current profiles. |
| Telecom Remote Radio Unit (RRU) | Medical Diagnostic Imaging Subsystem |
Use Scenario: High-reliability 5V and 3.3V supplies in outdoor base station equipment exposed to wide temperature and input voltage variation. IC Role / Device Role / Timing Role: Dual synchronous buck converter with external clock sync to system timing reference and TJ monitoring. Use Value: Synchronization eliminates beat frequencies; TJ output enables predictive thermal derating before shutdown threshold. | Use Scenario: Precision dual-rail supply for ADC drivers and FPGA configuration in portable ultrasound or X-ray subsystems. IC Role / Device Role / Timing Role: Low-noise, tightly regulated 5V and 1.8V outputs with tracking and soft-start coordination. Use Value: Independent SS pins allow controlled ramp-up of analog and digital domains; 806mV FB reference ensures <±1% output accuracy. |
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#PBF | Higher 60V input rating, but only single output channel; requires external MOSFETs; no integrated switches | Used where higher efficiency at light loads is needed via external FET selection, but lacks dual integrated outputs | Select when discrete FET control and higher Vin tolerance outweigh need for dual integrated channels |
| MPQ4332GSD-AEC1-P | Automotive-grade dual 3A buck with 3.5V–36V input; smaller QFN package; no DIV or CLKOUT; fixed 500kHz/2.2MHz options | Targeted for AEC-Q100 automotive applications with simpler clocking; lacks frequency synchronization and phase control | Select for cost-sensitive automotive designs where antiphase control and external sync are not required |
Compared with LTC3892EFE#PBF and MPQ4332GSD-AEC1-P, the LT3992IFE#PBF uniquely integrates dual 4.6A switches, full antiphase control, programmable frequency division, and synchronized CLKOUT-making it optimal for space-constrained, multi-rail systems requiring precise timing coordination and thermal visibility.
Availability
LT3992IFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and telecom remote radio units requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for LT3992IFE#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 validation and long-term product commitments.
The LT3992IFE#PBF belongs to Linear's high-voltage dual buck regulator family, designed specifically for demanding industrial and automotive applications requiring independent channel control, wide input range, and robust thermal management.
FAQ
What is the maximum output current supported by the LT3992IFE#PBF per channel?
The LT3992IFE#PBF supports up to 3A per channel under typical thermal conditions. Its internal 4.6A NPN switches, combined with the 38-lead TSSOP exposed-pad package (θJC = 10°C/W), enable reliable 3A operation across –40°C to 125°C junction temperature. Actual current depends on layout, airflow, and input-output differential.
How does the LT3992IFE#PBF achieve antiphase switching between channels?
The LT3992IFE#PBF maintains a fixed 180° phase relationship between channels by deriving channel 2's clock from the same master oscillator as channel 1, with intentional inversion. This is hardware-implemented and remains stable across temperature, line, and load - reducing input capacitor RMS current and output voltage ripple without external circuitry.
Can the LT3992IFE#PBF be synchronized to an external clock source?
Yes, the LT3992IFE#PBF supports external clock synchronization via the RT/SYNC pin. When driven by an external signal (250kHz–2MHz), the internal oscillator locks to the rising edge, automatically adjusts slope compensation, and maintains the 180° phase relationship. CLKOUT mirrors the synchronized frequency and duty cycle.
What is the function of the DIV pin on the LT3992IFE#PBF?
The DIV pin on the LT3992IFE#PBF sets the frequency division ratio for channel 1 relative to the master clock. Driven by a 12µA internal current source, a resistor from DIV to GND selects ÷1, ÷2, ÷4, or ÷8 - allowing channel 1 to run at a lower frequency than channel 2 to optimize inductor size and efficiency trade-offs.
Does the LT3992IFE#PBF provide thermal monitoring capability?
Yes, the LT3992IFE#PBF includes a dedicated TJ pin that outputs a voltage proportional to die temperature (250mV at 25°C, 10mV/°C slope). This analog output enables real-time thermal monitoring, closed-loop derating, and system-level thermal protection without requiring external sensors.
LT3992IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 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:
- 38-TSSOP-EP
LT3992IFE#PBF FAQ
1.How can I place an order for LT3992IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3992IFE#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 LT3992IFE#PBF reliable?
The price and inventory of LT3992IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3992IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3992IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3992IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3992IFE#PBF?
LT3992IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3992IFE#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 LT3992IFE#PBF?
For technical support, including LT3992IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3992IFE#PBF requirements.
6.How does Aetrix verify that LT3992IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3992IFE#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 LT3992IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3992IFE#PBF?
All LT3992IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3992IFE#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 LT3992IFE#PBF part is unused and in its original packaging.
Return procedure for LT3992IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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