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Analog Devices Inc. LT3992EFE#TRPBF
- Part No.:
- LT3992EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3992EFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,796
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Product details
Overview
LT3992EFE#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, wide 3V–60V input range, independent channel control (SHDN, FB, SS, ILIM, CMPI/CMPO), and antiphase 180° switching for reduced input ripple. It delivers up to 3A per channel in automotive and industrial distributed power systems requiring precise tracking and sequencing.
For engineers reviewing the LT3992EFE#TRPBF datasheet, LT3992EFE#TRPBF pinout, LT3992EFE#TRPBF application, or LT3992EFE#TRPBF equivalent, key selection considerations include its 38-lead TSSOP exposed-pad package, FMEA-compliant design, programmable 250kHz–2MHz switching frequency with synchronization capability, independent current limit (1.8A–4.8A), and die temperature monitoring via TJ pin.
Technical Context
The LT3992EFE#TRPBF implements dual independent current-mode control loops with cycle-by-cycle peak current limiting, internal slope compensation, and antiphase clocking-ensuring stable regulation across wide VIN/VOUT ratios. Each channel features dedicated error amplifiers (gm = 350 µMho typ), programmable soft-start (13.5 µA source current), and comparator-based power-good signaling (725 mV threshold with 80 mV hysteresis).
Its oscillator supports resistor-set (RT/SYNC) or external clock synchronization (250 kHz–2 MHz), with DIV pin enabling 1×/2×/4×/8× frequency division on Channel 1 while maintaining fixed 180° phase offset versus Channel 2. The TJ pin provides a calibrated 10 mV/°C analog output (250 mV at 25°C) for real-time junction temperature monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports direct battery-fed industrial and automotive rails without pre-regulation. |
| Output Current per Channel | Up to 3A - enabled by internal 4.6A NPN switches with 325 mV saturation voltage at 3A. |
| Switching Frequency Range | 250 kHz to 2 MHz - programmable via RT/SYNC resistor or external clock; enables optimization of efficiency vs. size. |
| Feedback Reference Voltage | 806 mV ±18 mV - tightly regulated reference ensures accurate output voltage setting with low drift over temperature. |
| Quiescent Current (Dual Off) | <10 µA - achieved via deep shutdown mode, critical for always-on automotive subsystems. |
| Junction Temp Sensing | TJ pin outputs 250 mV @ 25°C +10 mV/°C - enables closed-loop thermal management without external sensors. |
| Package | 38-lead plastic TSSOP with exposed pad - FMEA-compliant layout, θJA = 17.5°C/W, requires GND-soldered thermal pad. |
Pinout & Package
LT3992EFE#TRPBF uses a 38-lead plastic TSSOP package with exposed thermal pad (Pin 39 = GND). The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. Pin count and layout differ from the QFN variant (LT3992EUH); no pin compatibility exists between packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1/BST2 | Bootstrap supply for NPN base drive | Enables high-side NPN switch operation; requires external capacitor tied between BSTx and SWx. |
| SW1/SW2 | Emitter of internal NPN power switch | High dI/dt node; requires local Schottky catch diode to GND and tight layout with VIN decoupling. |
| FB1/FB2 | Negative input of error amplifier | Regulated to 806 mV; sets output voltage via resistive divider; bias current flows out (≤300 nA). |
| ILIM1/ILIM2 | Peak current limit programming input | 12 µA internal current source; resistor to GND sets limit from 1.8A (0.5V) to 4.8A (1V). |
| RT/SYNC | Oscillator frequency control / sync input | 12 µA current source for resistor setting; accepts external clock (250 kHz–2 MHz) on rising edge. |
| DIV | Channel 1 frequency divider select | 12 µA current source; resistor to GND selects 1×/2×/4×/8× division of master clock. |
| TJ | Analog junction temperature output | 250 mV @ 25°C +10 mV/°C; used for thermal monitoring or overtemperature protection. |
| CLKOUT | Synchronized clock output | 0V–2.5V square wave at master clock frequency; mirrors RT/SYNC duty cycle when synced. |
| SHDN1/SHDN2 | Independent channel enable/disable | 1.32 V threshold; SHDN1 powers common circuitry - required for CH2 operation. |
| GND (Pin 39) | Power and signal ground reference | Exposed pad is sole GND connection; must be soldered to large copper area for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Independent channel control | Separate SHDN, SS, FB, ILIM, CMPI/CMPO pins per channel enable flexible sequencing, tracking, and fault isolation. |
| Antiphase 180° switching | Reduces input capacitor RMS current and voltage ripple by ~30% versus in-phase operation. |
| Programmable current limit | 1.8A–4.8A per channel via ILIM resistor - allows precise inductor and MOSFET selection without overdesign. |
| Dual-frequency flexibility | CH1 frequency divisible (1×/2×/4×/8×) while CH2 runs at master clock - optimizes component size per rail. |
| FMEA-compliant TSSOP | 38-pin exposed-pad package meets functional safety requirements for automotive power supplies. |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail 12V/5V supply for radar ECU with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Primary dual-buck regulator delivering sequenced, tracked outputs with synchronized clocks to minimize conducted emissions. Use Value: Antiphase operation cuts input ripple by 30%, reducing bulk capacitance; TJ monitoring enables dynamic derating under hood temperature rise. | Use Scenario: Distributed 24V-to-5V/3.3V conversion across modular I/O cards in factory automation rack. IC Role / Device Role / Timing Role: Compact dual-channel PMIC providing isolated, independently controlled rails with power-good signaling per channel. Use Value: Independent SHDN and CMPO pins allow hot-swap sequencing and per-rail fault reporting without microcontroller intervention. |
| Medical Imaging Sensor Array | Telecom Remote Radio Unit |
Use Scenario: Low-noise, high-reliability 3.3V/1.8V supply for CMOS image sensor array in portable ultrasound. IC Role / Device Role / Timing Role: Dual buck converter with precision tracking (±13 mV FB offset) and ultra-low quiescent current during standby. Use Value: 806 mV FB reference with ±18 mV tolerance ensures <±0.5% output accuracy; <10 µA shutdown current extends battery life. | Use Scenario: 48V-to-12V/5V conversion in outdoor RRUs with wide ambient temperature range (−40°C to +125°C). IC Role / Device Role / Timing Role: High-input-voltage dual regulator with extended junction temp rating and robust UVLO (2.9V min). Use Value: 60V absolute max input withstands telecom surge transients; TJ pin enables real-time thermal throttling in sealed enclosures. |
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 | Same 38-lead TSSOP package, but uses external MOSFETs (no internal switches); higher efficiency at >5A loads. | Requires external high-side N-channel MOSFETs and gate drivers; better suited for >5A or high-efficiency designs. | Select LTC3892EFE#TRPBF when output current exceeds 3A per channel or when discrete FET optimization is needed. |
| LT8640SEFE#TRPBF | Single-channel, 4A synchronous buck; smaller 20-lead TSSOP; no antiphase or dual-channel sequencing features. | Lacks dual-channel control, tracking, or CLKOUT synchronization; suitable only for single-rail replacement. | Choose LT8640SEFE#TRPBF only if system requires only one regulated rail and space is highly constrained. |
Compared with LTC3892EFE#TRPBF and LT8640SEFE#TRPBF, the LT3992EFE#TRPBF uniquely integrates dual 4.6A NPN switches, independent channel sequencing, and antiphase clocking in an FMEA-compliant TSSOP - making it optimal for compact, safety-aware dual-rail systems where integration and control granularity outweigh raw efficiency gains.
Availability
LT3992EFE#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial PLC I/O modules, and medical imaging sensor arrays requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LT3992EFE#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.
The LT3992 belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for demanding automotive, industrial, and medical applications requiring wide input range, dual-rail flexibility, and functional safety compliance.
FAQ
What is the maximum input voltage rating for the LT3992EFE#TRPBF?
The LT3992EFE#TRPBF has an absolute maximum input voltage rating of 60V on VIN1 and VIN2 pins. Operation is specified from 3V to 60V, enabling direct connection to 48V telecom, 36V industrial, and 12V/24V automotive battery rails without external pre-regulation. Exceeding 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT3992EFE#TRPBF support synchronization to an external clock source?
Yes, the LT3992EFE#TRPBF supports external clock synchronization via the RT/SYNC pin. When driven with a clean TTL/CMOS clock signal (250 kHz–2 MHz), the internal oscillator locks to the rising edge, maintaining antiphase relationship between channels and automatically adjusting slope compensation. The CLKOUT pin reflects the synchronized frequency and duty cycle.
How is output voltage accuracy maintained across temperature for the LT3992EFE#TRPBF?
The LT3992EFE#TRPBF maintains output voltage accuracy via a precision 806 mV feedback reference with ±18 mV initial tolerance and ±24 mV total variation over −40°C to +125°C junction temperature. Its matched channel-to-channel FB offset is limited to ±13 mV, enabling tight tracking between dual outputs without external calibration.
What thermal management provisions does the LT3992EFE#TRPBF include?
The LT3992EFE#TRPBF integrates a calibrated analog TJ pin (250 mV at 25°C, +10 mV/°C) for real-time junction temperature monitoring. Combined with its 38-lead TSSOP exposed pad (θJA = 17.5°C/W), this enables closed-loop thermal derating, overtemperature shutdown coordination, and predictive maintenance - critical for automotive and industrial deployments.
Can the two channels of the LT3992EFE#TRPBF be configured for different switching frequencies?
Yes, the LT3992EFE#TRPBF supports independent frequency configuration: Channel 2 runs at the master clock frequency set by RT/SYNC, while Channel 1 frequency is divided by 1, 2, 4, or 8 via the DIV pin. This allows optimizing inductor size per rail - e.g., 1 MHz for 12V→5V and 500 kHz for 12V→3.3V - without compromising antiphase benefits.
LT3992EFE#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
LT3992EFE#TRPBF FAQ
1.How can I place an order for LT3992EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3992EFE#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 LT3992EFE#TRPBF reliable?
The price and inventory of LT3992EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3992EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3992EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3992EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3992EFE#TRPBF?
LT3992EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3992EFE#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 LT3992EFE#TRPBF?
For technical support, including LT3992EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3992EFE#TRPBF requirements.
6.How does Aetrix verify that LT3992EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3992EFE#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 LT3992EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3992EFE#TRPBF?
All LT3992EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3992EFE#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 LT3992EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3992EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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