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Analog Devices Inc. LT3992HFE#TRPBF
- Part No.:
- LT3992HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3992HFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,351
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Product details
Overview
LT3992HFE#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, programmable current limit, and antiphase switching at 180° for reduced output ripple. It is used in automotive front-end power supplies requiring high-temperature reliability.
For engineers reviewing the LT3992HFE#TRPBF datasheet, LT3992HFE#TRPBF pinout, LT3992HFE#TRPBF application, or LT3992HFE#TRPBF equivalent, key selection criteria include its –40°C to 150°C guaranteed junction temperature range, 38-pin TSSOP exposed-pad package with FMEA-compliant layout, dual-channel tracking capability, and synchronized clock output for multi-regulator coordination.
Technical Context
The LT3992HFE#TRPBF implements independent current-mode control per channel with cycle-by-cycle peak current limiting, internal slope compensation, and antiphase clocking-ensuring stable regulation under transient load steps while minimizing input/output capacitor requirements. Its master oscillator supports resistor-set (250kHz–2MHz) or external synchronization, with channel 1 frequency divisible by 1/2/4/8 via the DIV pin.
Each channel features dedicated SHDN, SS, FB, ILIM, CMPI/CMPO, and VC pins enabling flexible sequencing, power-good signaling, adjustable current limits (1.8A–4.8A), and thermal monitoring via the TJ pin (250mV @ 25°C, 10mV/°C). VIN1 powers both channels' bias circuitry and must exceed 2.9V for full operation.
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 - enables dual-rail supply generation (e.g., 12V + 5V or 5V + 3.3V) without external MOSFETs. |
| Switching Frequency Range | 250kHz to 2MHz - programmable via RT/SYNC resistor or external clock; allows optimization of efficiency vs. size trade-offs. |
| Junction Temperature Range | –40°C to 150°C - fully specified and guaranteed, making it suitable for under-hood automotive applications. |
| Feedback Reference Voltage | 806mV ±18mV - precise reference enables accurate output voltage setting with minimal error across temperature. |
| Phase Relationship | 180° antiphase between channels - reduces input ripple current amplitude and eases input capacitor sizing. |
| Quiescent Current (Shutdown) | <10µA total - ensures ultra-low standby power in always-on vehicle subsystems. |
Pinout & Package
LT3992HFE#TRPBF uses a 38-lead plastic TSSOP package with exposed pad (pin 39 = GND), optimized for thermal performance (θJA = 17.5°C/W, θJC = 10°C/W). The exposed pad must be soldered to PCB ground plane for reliable thermal dissipation in high-power automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1/BST2 | Bootstrap supply for internal NPN base drive | Enables high-side NPN switch operation; requires external ceramic capacitor (typically 0.1µF) from BSTx to SWx. |
| SW1/SW2 | Emitter of internal NPN power switch | Connects to inductor; requires external Schottky catch diode to GND to clamp negative voltage spikes during turn-off. |
| VIN1/VIN2 | Channel input supply rails | VIN1 powers internal bias circuitry and CH1 switch; VIN2 powers CH2 switch only; VIN1 must be ≥2.9V for CH2 operation. |
| SHDN1/SHDN2 | Independent channel enable control | SHDN1 controls both channels' bias and must be active for CH2 to function; threshold = 1.32V typical. |
| FB1/FB2 | Negative input to error amplifier | Regulated to 806mV; sets output voltage via resistive divider; bias current flows out (nA-level). |
| ILIM1/ILIM2 | Peak inductor current programming | Current-source-driven pin (12µA typ); resistor to GND sets current limit from 1.8A (0.5V) to 4.8A (1V). |
| RT/SYNC | Oscillator frequency control / sync input | Internal 12µA current source sets frequency via resistor; accepts external clock (250kHz–2MHz) on rising edge for system-wide synchronization. |
| DIV | Channel 1 frequency division ratio select | Internal 12µA current source; resistor to GND selects ÷1, ÷2, ÷4, or ÷8 for CH1 relative to master clock. |
| CLKOUT | Synchronized clock output | 0V–2.5V square wave at master clock frequency; used to synchronize other regulators or timing-critical peripherals. |
| TJ | Die temperature monitor output | Analog voltage proportional to junction temp: 250mV @ 25°C, 10mV/°C slope; enables real-time thermal protection. |
Key Features
| Feature | Design Value |
|---|---|
| Antiphase switching | Maintains fixed 180° phase shift between channels to halve input ripple current and reduce required bulk capacitance. |
| Flexible channel sequencing | Independent SHDN, SS, and UVLO per channel allow staggered startup, fault isolation, and rail-tracking configurations. |
| Programmable current limit | Adjustable peak inductor current (1.8A–4.8A) via single resistor per channel, enabling robust overload protection without external sensing. |
| Integrated thermal monitoring | TJ pin provides calibrated analog voltage output (250mV @ 25°C, ±100mV error over –40°C to 150°C) for closed-loop thermal management. |
| FMEA-compliant packaging | 38-pin TSSOP with exposed pad meets automotive functional safety layout guidelines for fault detection and thermal reliability. |
Applications
| Automotive Front-End Power Supply | Industrial Distributed Power System |
|---|---|
Use Scenario: Power conversion in engine control units (ECUs), ADAS domain controllers, and infotainment head units where input voltage varies from cold-crank (3V) to load-dump (60V). IC Role / Device Role / Timing Role: Dual-channel buck regulator providing isolated 12V and 5V rails with independent sequencing, thermal monitoring, and fail-safe shutdown. Use Value: Guaranteed operation up to 150°C junction temperature eliminates derating concerns in under-hood placement; antiphase operation reduces EMI filtering cost. | Use Scenario: Centralized power architecture in factory automation PLCs and motor drives requiring multiple regulated outputs from a common 24V or 48V bus. IC Role / Device Role / Timing Role: Dual synchronous buck controller generating tracking 5V/3.3V rails for FPGA I/O banks and core logic, with shared clock synchronization. Use Value: Independent RT/SYNC and DIV pins allow one LT3992HFE#TRPBF to coordinate multiple converters across a board, simplifying timing design and reducing component count. |
| Redundant Telecom Power Module | Rail-Tracking Point-of-Load Converter |
Use Scenario: Backup power subsystems in 48V telecom equipment where continuous operation must survive input transients and thermal stress. IC Role / Device Role / Timing Role: Dual 3A regulator delivering parallel 5V outputs with current sharing enabled via VC pin interconnection and antiphase clocking. Use Value: <10µA shutdown current extends battery backup runtime; TJ pin enables predictive thermal throttling before shutdown occurs. | Use Scenario: Powering mixed-signal SoCs or ADC/DAC subsystems requiring tightly coupled analog and digital supply rails. IC Role / Device Role / Timing Role: Dual-channel buck with synchronized soft-start and tracking feedback (via shared SS pins) to ensure analog rail powers up before digital rail. Use Value: Independent SS1/SS2 pins support programmable ramp rates; connecting them forces matched rise times, eliminating sequencing errors in sensitive signal chains. |
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 | Same 38-pin TSSOP package, –40°C to 125°C rating, dual-phase synchronous buck controller (external MOSFETs), no integrated switches. | Requires external high-side/low-side MOSFETs and gate drivers; higher BOM cost but greater flexibility in current scaling and efficiency tuning. | Select when >3A/channel output or >95% efficiency at light loads is required; not drop-in due to external power stage. |
| MPQ4332GSD-AEC1-Z | Monolithic dual 3A buck, 3.8V–36V input, QFN-24 package, AEC-Q100 Grade 1 (–40°C to 125°C), no DIV or CLKOUT pins. | Lacks frequency division, clock output, and TJ monitoring; simpler feature set but lower thermal rating and no antiphase control. | Select for cost-sensitive automotive modules where 125°C max junction suffices and multi-regulator synchronization is unnecessary. |
Compared with LTC3892EFE#PBF and MPQ4332GSD-AEC1-Z, the LT3992HFE#TRPBF uniquely combines integrated 4.6A switches, guaranteed 150°C operation, antiphase clocking, and die temperature monitoring in a single FMEA-ready package-making it optimal for high-reliability automotive power domains where integration, thermal margin, and system-level timing control are critical.
Availability
LT3992HFE#TRPBF is available at Aetrix Electronics and suitable for automotive front-end supplies, industrial distributed power systems, redundant telecom modules, and rail-tracking point-of-load converters requiring stable component supply across extended temperature ranges.
Supply support for LT3992HFE#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 its high-performance power management portfolio with rigorous automotive qualification standards.
The LT3992HFE#TRPBF belongs to Linear's high-voltage dual buck regulator product line, designed specifically for demanding automotive and industrial applications requiring wide input range, high temperature resilience, and precise multi-rail coordination.
FAQ
What is the maximum guaranteed junction temperature for the LT3992HFE#TRPBF?
The LT3992HFE#TRPBF is fully specified and guaranteed over a junction temperature range of –40°C to 150°C. This H-grade qualification distinguishes it from E- and I-grade variants (–40°C to 125°C) and enables deployment in under-hood automotive locations without thermal derating. The TJ pin provides real-time monitoring with 250mV offset at 25°C and 10mV/°C slope, allowing system-level thermal management using the LT3992HFE#TRPBF's native output.
Can the LT3992HFE#TRPBF operate with only VIN2 powered?
No. The LT3992HFE#TRPBF requires VIN1 to be above its 2.9V undervoltage lockout threshold to power internal bias circuitry-including the oscillator, references, thermometer, and common control logic. VIN2 alone cannot enable operation of either channel. This architecture ensures coordinated startup and prevents partial functionality that could compromise system reliability. Both channels depend on VIN1, making the LT3992HFE#TRPBF unsuitable for split-input architectures where VIN1 is unavailable.
How does the DIV pin affect channel 1 switching frequency?
The DIV pin on the LT3992HFE#TRPBF sets the frequency division ratio for channel 1 relative to the master clock established by RT/SYNC. An internal 12µA current source pulls the DIV pin; connecting a resistor from DIV to GND generates a voltage that selects ÷1, ÷2, ÷4, or ÷8. For example, 0.5V at DIV selects ÷2, allowing CH1 to run at half the master frequency while CH2 remains at full frequency-enabling optimized inductor sizing per rail. This feature is exclusive to the LT3992HFE#TRPBF among dual buck regulators in its class.
Does the LT3992HFE#TRPBF support output voltage tracking between channels?
Yes. The LT3992HFE#TRPBF supports flexible output voltage tracking via its independent soft-start (SS1/SS2) and feedback (FB1/FB2) pins. Connecting SS1 and SS2 together forces identical ramp rates, ensuring simultaneous voltage rise. Additionally, tying FB2 to the output of a resistive divider from VOUT1 creates a follower configuration where VOUT2 tracks VOUT1. This capability is confirmed in the LT3992HFE#TRPBF's Applications section and enables precise sequencing in mixed-signal SoC power domains without external tracking ICs.
What is the purpose of the CLKOUT pin on the LT3992HFE#TRPBF?
The CLKOUT pin on the LT3992HFE#TRPBF provides a synchronized square-wave output (0V–2.5V) at the master switching frequency, aligned with channel 1's clock edge. It enables system-level timing coordination-such as synchronizing additional LT3992HFE#TRPBF devices, external ADC sampling clocks, or digital signal processors-to minimize beat frequencies and EMI. Unlike generic clock outputs, CLKOUT maintains phase integrity during external synchronization and reflects the same duty cycle as the applied RT/SYNC signal, making it essential for deterministic multi-regulator designs.
LT3992HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3992HFE#TRPBF FAQ
1.How can I place an order for LT3992HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3992HFE#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 LT3992HFE#TRPBF reliable?
The price and inventory of LT3992HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3992HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3992HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3992HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3992HFE#TRPBF?
LT3992HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3992HFE#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 LT3992HFE#TRPBF?
For technical support, including LT3992HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3992HFE#TRPBF requirements.
6.How does Aetrix verify that LT3992HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3992HFE#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 LT3992HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3992HFE#TRPBF?
All LT3992HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3992HFE#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 LT3992HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3992HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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