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Analog Devices Inc. LT3992EFE#PBF
- Part No.:
- LT3992EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3992EFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:880
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Product details
Overview
LT3992EFE#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, operating from 3V to 60V input, delivering up to 3A per channel, and featuring independent shutdown, soft-start, UVLO, programmable current limit, and antiphase switching at 180° for reduced output ripple. It is used in automotive distributed power supplies and industrial multi-rail systems requiring precise voltage tracking.
For engineers reviewing the LT3992EFE#PBF datasheet, LT3992EFE#PBF pinout, LT3992EFE#PBF application, or LT3992EFE#PBF equivalent, key selection criteria include its FMEA-compliant 38-pin TSSOP exposed-pad package, dual-channel synchronization capability (250kHz–2MHz), independent feedback references (806mV ±20mV), die temperature monitoring (TJ pin), and 95% maximum duty cycle for low-dropout operation.
Technical Context
The LT3992EFE#PBF implements dual independent current-mode control loops with separate error amplifiers (gm = 350 µMho typ), VC pins acting as combined loop output and current clamp inputs, and cycle-by-cycle peak current sensing via internal sense resistors. Each channel features dedicated ILIM, SS, FB, CMPI/CMPO, and SHDN pins enabling full sequencing, tracking, and power-good signaling.
Its oscillator supports resistor-set (RT/SYNC) or external clock synchronization, with channel 1 frequency divisible by 1/2/4/8 via the DIV pin while maintaining strict 180° phase shift between channels. The device maintains antiphase operation across temperature (175°–195°) and load, and includes dropout enhancement allowing extended on-time when boost capacitor voltage permits.
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 integrated 4.6A NPN switches with 325mV saturation at 3A. |
| Feedback Reference Voltage | 806mV ±20mV - high-accuracy reference enables tight output regulation (±1.2%) over temperature. |
| Switching Frequency Range | 250kHz to 2MHz - programmable via RT/SYNC resistor or external clock; supports optimal inductor sizing. |
| Phase Relationship | 180° antiphase - reduces input/output capacitor RMS current and EMI, enabling smaller passive components. |
| Max Duty Cycle | 95% - allows operation with minimal VIN–VOUT differential, critical for high-voltage-to-low-voltage conversion. |
| Quiescent Current (Shutdown) | <10µA total - achieved by disabling both channels; VIN1 draws 6µA, VIN2 draws <1µA. |
| Junction Temp Monitoring | TJ pin outputs 250mV at 25°C +10mV/°C - enables real-time thermal management without external sensors. |
Pinout & Package
LT3992EFE#PBF uses a 38-lead plastic TSSOP package with exposed pad (pin 39 = GND), θJA = 17.5°C/W, θJC = 10°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BST1/2 | Boost capacitor drive | Provides gate drive above VIN to ensure full NPN saturation; requires external ceramic capacitor to SW. |
| SW1/2 | Power switch emitter | Connects to inductor and Schottky catch diode; experiences high dV/dt during turn-off. |
| FB1/2 | Error amplifier inverting input | Regulated to 806mV; bias current flows out - sets output voltage via resistor divider. |
| ILIM1/2 | Peak current limit programming | 12µA internal current source into external resistor sets current limit from 1.8A to 4.8A. |
| SHDN1/2 | Channel enable control | SHDN1 must be >1.32V to enable both channels; SHDN2 independently disables channel 2 only. |
| RT/SYNC | Oscillator frequency control | 12µA current source into resistor sets frequency; accepts external clock for synchronization. |
| DIV | Channel 1 frequency divider select | 12µA current into resistor selects ÷1/÷2/÷4/÷8 ratio relative to master clock. |
| TJ | Die temperature monitor | Analog voltage output (250mV @ 25°C, +10mV/°C) - used for thermal protection or telemetry. |
| CLKOUT | Synchronized clock output | 0V–2.5V square wave at master clock frequency; mirrors RT/SYNC source duty cycle. |
| GND (Pin 39) | Common signal & power ground | Exposed pad - sole ground connection; must be soldered to large copper area for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-channel control | Each channel has dedicated VIN, SHDN, SS, FB, ILIM, CMPI/CMPO - enables asymmetric rail sequencing and tracking. |
| Antiphase switching | Fixed 180° phase shift between channels reduces input ripple current by ~70%, cutting required bulk capacitance. |
| Programmable current limit | ILIM pin accepts 0.5V–1.5V to set peak inductor current from 1.8A to 4.8A - supports diverse inductor selections. |
| Dropout enhancement | Switch remains on across multiple cycles when BST voltage permits - extends usable duty cycle beyond typical limits. |
| FMEA-compliant packaging | 38-pin TSSOP with exposed pad meets automotive functional safety requirements for fault detection and thermal robustness. |
| Thermal monitoring interface | TJ pin provides calibrated analog voltage (±100mV error over –40°C to 125°C) - eliminates need for external thermal ICs. |
Applications
| Automotive ADAS Power Supply | Industrial Dual-Rail Controller |
|---|---|
Use Scenario: Powering camera modules and radar processors requiring tightly tracked 5V and 3.3V rails from 12V battery with transient immunity. IC Role / Device Role / Timing Role: Dual synchronous buck controller providing independent soft-start, UVLO, and power-good signals per rail with antiphase switching. Use Value: Reduces input capacitor size by 40% vs. in-phase operation and enables single-chip solution for ISO 26262-compliant power domains. | Use Scenario: Generating isolated 15V and 5V supplies for PLC I/O modules operating from 24V or 48V industrial bus. IC Role / Device Role / Timing Role: Monolithic dual regulator with programmable current limits and independent shutdown for flexible rail configuration. Use Value: Eliminates need for two discrete controllers; 95% duty cycle supports 48V→5V conversion without pre-buck stage. |
| Distributed Telecom Supply | Medical Imaging Subsystem |
Use Scenario: Point-of-load regulation for FPGA core (1.2V) and I/O (2.5V) rails in 48V-powered base station equipment. IC Role / Device Role / Timing Role: Dual-channel buck with synchronized CLKOUT enabling coordination with other regulators in multi-phase system. Use Value: CLKOUT pin allows daisy-chained synchronization across multiple LT3992 devices, minimizing system-level EMI peaks. | Use Scenario: Powering CCD sensor bias and analog front-end circuits requiring ultra-stable, low-noise 3.3V and 5V rails. IC Role / Device Role / Timing Role: Precision dual regulator with 806mV feedback reference (±1.2%) and TJ monitoring for thermal derating. Use Value: Tight reference tolerance and die-temperature feedback enable stable imaging performance across ambient range (–40°C to 85°C). |
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 |
|---|---|---|---|
| LTC3892-2#PBF | Same 38-pin TSSOP package, 4.5V–60V input, but uses external MOSFETs (no internal switches); higher max VIN (60V vs. 60V), lower quiescent current (28µA vs. 6µA in shutdown). | Requires external high-side N-channel MOSFETs and gate drivers - increases BOM count and layout complexity. | Select LTC3892-2#PBF when higher efficiency at light loads or >3A output is needed; LT3992EFE#PBF preferred for compactness and integration. |
| MPQ4332GSD-AEC1-Z | Automotive-grade dual 3A buck in 20-pin QFN; fixed 500kHz/2.2MHz frequencies, no DIV or CLKOUT, no TJ pin, no antiphase control. | Lacks independent channel control, synchronization, and thermal monitoring - suitable only for simple dual-rail apps without sequencing. | Select MPQ4332GSD-AEC1-Z for cost-sensitive AEC-Q100 applications where advanced features are unnecessary. |
Compared with LTC3892-2#PBF and MPQ4332GSD-AEC1-Z, the LT3992EFE#PBF uniquely combines internal 4.6A switches, antiphase operation, programmable frequency division, and die-temperature telemetry in a single FMEA-compliant package - making it optimal for space-constrained, thermally managed, and EMI-sensitive dual-rail designs.
Availability
LT3992EFE#PBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial PLC subsystems, and telecom point-of-load applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LT3992EFE#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 LT3992 product line delivers monolithic dual buck regulators optimized for high-input-voltage, multi-rail systems requiring precision tracking, thermal awareness, and EMI reduction - targeting automotive, industrial, and medical power architectures.
FAQ
What is the maximum input voltage rating for the LT3992EFE#PBF?
The LT3992EFE#PBF has an absolute maximum input voltage rating of 60V on both VIN1 and VIN2 pins. Operation is specified from 3V to 60V, with VIN1 undervoltage lockout activating below 2.9V (typical). Exceeding 60V risks permanent damage per Absolute Maximum Ratings. The LT3992EFE#PBF must be operated within this range to ensure reliability and specification compliance.
Does the LT3992EFE#PBF support synchronization to an external clock source?
Yes, the LT3992EFE#PBF supports external clock synchronization via the RT/SYNC pin. When driven with a clean CMOS/TTL clock (250kHz–2MHz), the internal oscillator locks to the rising edge, and CLKOUT mirrors the input duty cycle. The LT3992EFE#PBF maintains antiphase relationship and automatically adjusts slope compensation to prevent subharmonic oscillation during sync mode.
How is output voltage accuracy maintained across temperature for the LT3992EFE#PBF?
The LT3992EFE#PBF maintains output voltage accuracy via a trimmed 806mV feedback reference with ±20mV variation over –40°C to 125°C junction temperature. Its FB offset between channels is limited to ±13mV, and reference regulation holds within ±24mV across 4V–60V input. This ensures ≤±1.2% output tolerance in well-designed layouts - critical for powering sensitive analog or digital loads.
Can the two channels of the LT3992EFE#PBF be configured for different switching frequencies?
Yes, the LT3992EFE#PBF supports independent channel frequencies: channel 2 runs at the master clock frequency (set by RT/SYNC), while channel 1 frequency is divided by 1, 2, 4, or 8 using the DIV pin. This enables optimization - e.g., 1MHz for channel 2 (fast transient response) and 500kHz for channel 1 (lower core loss) - all while preserving 180° phase alignment and shared thermal management.
What thermal protection features does the LT3992EFE#PBF provide?
The LT3992EFE#PBF integrates thermal shutdown and real-time die temperature monitoring. It asserts thermal shutdown if junction temperature exceeds safe limits, and the TJ pin outputs a calibrated analog voltage (250mV at 25°C, +10mV/°C) with ±100mV error over –40°C to 125°C. This allows external circuitry or MCU to implement dynamic derating - a key feature for the LT3992EFE#PBF in automotive and industrial environments.
LT3992EFE#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
LT3992EFE#PBF FAQ
1.How can I place an order for LT3992EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3992EFE#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 LT3992EFE#PBF reliable?
The price and inventory of LT3992EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3992EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3992EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3992EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3992EFE#PBF?
LT3992EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3992EFE#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 LT3992EFE#PBF?
For technical support, including LT3992EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3992EFE#PBF requirements.
6.How does Aetrix verify that LT3992EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3992EFE#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 LT3992EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3992EFE#PBF?
All LT3992EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3992EFE#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 LT3992EFE#PBF part is unused and in its original packaging.
Return procedure for LT3992EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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