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Analog Devices Inc. LT3692AIUH#PBF
- Part No.:
- LT3692AIUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3692AIUH#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A DL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,615
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Product details
Overview
LT3692AIUH#PBF from Analog Devices (formerly Linear Technology) is a monolithic dual-channel current-mode PWM step-down DC/DC converter with two internal 3.8A NPN power switches, wide 3V–36V input range, independent channel control (SHDN, FB, SS, ILIM, UVLO), and antiphase 180° switching to reduce output ripple. It delivers up to 3.5A per channel and supports automotive-grade operation from –40°C to 125°C in a 5mm × 5mm QFN package.
For engineers reviewing the LT3692AIUH#PBF datasheet, LT3692AIUH#PBF pinout, LT3692AIUH#PBF application, or LT3692AIUH#PBF equivalent, key selection considerations include dual-channel tracking capability, programmable per-channel current limit (2A–4.8A), synchronized or resistor-set frequency (250kHz–2MHz), die temperature monitoring (TJ pin), and FMEA-compliant layout support via exposed-pad thermal management.
Technical Context
The LT3692AIUH#PBF implements independent current-mode control per channel, with each regulator featuring its own error amplifier (gm = 400 µMho), peak-current sensing via IND/VOUT pins, and voltage-clamped VC outputs for overload protection. The master oscillator-set by RT/SYNC or external clock-is divided for Channel 1 (÷1/÷2/÷4/÷8), while Channel 2 runs at full frequency with fixed 180° phase offset.
It integrates VIN1-supplied bias generation (including 0.806V FB reference, 12µA current sources for RT/SYNC/DIV/ILIM), thermal shutdown, OVLO (39V typ), and UVLO (2.8V typ). The TJ pin provides a calibrated 10mV/°C analog temperature output referenced to 250mV at 25°C, enabling real-time junction monitoring without external sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V continuous; withstands 60V transients - enables direct battery-input designs in 12V/24V automotive and industrial systems. |
| Output Current per Channel | Up to 3.5A - supports high-power digital loads like FPGAs, DSPs, and multi-rail SoCs without external MOSFETs. |
| Switching Frequency Range | 250kHz to 2.5MHz (resistor- or clock-synchronized) - allows optimization of inductor size, efficiency, and EMI profile across diverse PCB layouts. |
| Feedback Reference Voltage | 806mV ±13mV over temperature - ensures precise output regulation and tight tracking between channels in dual-output configurations. |
| Junction Temperature Range | –40°C to +125°C - qualified for under-hood automotive, industrial control, and harsh-environment embedded applications. |
| Quiescent Current (Shutdown) | <10µA total - enables ultra-low-power standby modes in always-on systems such as telematics and sensor nodes. |
| Minimum On-Time | 140ns - supports high step-down ratios (e.g., 24V→1.2V) at high frequencies without pulse-skipping instability. |
Pinout & Package
LT3692AIUH#PBF is housed in a thermally enhanced 32-lead 5mm × 5mm plastic QFN package with exposed pad (Pin 33 = GND). The package supports high-power dissipation (θJC = 1.5°C/W) and requires soldering of the exposed pad to a large PCB copper area for reliable thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1/BST2 | Bootstrap supply for internal NPN gate 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; must be routed with low-inductance path and paired with Schottky catch diode to ground. |
| FB1/FB2 | Negative input of error amplifier | Regulated to 806mV; sets output voltage via resistive divider; bias current flows out (≤200nA). |
| ILIM1/ILIM2 | Peak current limit programming input | 12µA internal current source pulls to ground; 0V–1.5V range sets 4.8A–2A current limit per channel. |
| RT/SYNC | Oscillator frequency control / sync input | 12µA current source sets frequency via resistor (250kHz–2.5MHz); accepts external clock (250kHz–2MHz) on rising edge. |
| DIV | Channel 1 frequency divider select | 12µA current source sets voltage threshold; resistor to GND selects ÷1/÷2/÷4/÷8 for CH1 relative to master clock. |
| TJ | Analog die temperature monitor output | 250mV @ 25°C, 10mV/°C slope - enables closed-loop thermal derating or system-level fault detection. |
| CLKOUT | Synchronized clock output | 0V–2.5V square wave; matches master clock frequency and phase; supports multi-regulator synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-channel control logic | Separate SHDN, SS, FB, ILIM, CMPI/CMPO pins enable flexible sequencing, tracking, and power-good signaling for complex multi-rail supplies. |
| Antiphase 180° switching | Reduces input/output capacitor RMS current and voltage ripple by up to 30%, lowering required capacitance and board area. |
| Programmable current limit (2A–4.8A) | Per-channel ILIM pin allows precise overcurrent protection tuning without changing external components or layout. |
| Die temperature monitoring (TJ pin) | Provides factory-calibrated analog voltage proportional to junction temperature - eliminates need for external thermal sensors in space-constrained designs. |
| Dropout enhancement (95% max duty cycle) | Allows extended conduction during low-VIN conditions by holding switch on across multiple cycles when boost capacitor charge permits. |
| FMEA-compliant QFN package | 32-pin 5mm × 5mm exposed-pad construction meets automotive functional safety requirements for thermal reliability and traceability. |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for radar processor (3.3V) and interface ASIC (1.2V) in compact front-end module. IC Role / Device Role / Timing Role: Primary dual-output buck controller managing independent sequencing, current limiting, and thermal monitoring. Use Value: Eliminates discrete regulators and external sequencing ICs; antiphase operation reduces input capacitor count by 40% vs. in-phase design. |
Use Scenario: Distributed 5V and 3.3V rails powering isolated analog inputs, digital logic, and communication interfaces in modular PLC backplane. IC Role / Device Role / Timing Role: Centralized dual-buck regulator with independent UVLO and PG signaling per rail. Use Value: Independent SHDN and CMPO pins allow hot-swap capability and per-rail fault isolation without system reset. |
| Medical Imaging Sensor Array | Telecom Baseband Processor |
Use Scenario: Low-noise, tightly tracked 1.8V/1.2V supplies for high-speed ADCs and FPGA fabric in portable ultrasound probe. IC Role / Device Role / Timing Role: Dual-channel tracking regulator with soft-start synchronization and TJ-based thermal throttling. Use Value: SS1/SS2 tie enables sub-1% output tracking error; TJ pin feeds FPGA thermal management firmware to prevent overheating during burst acquisition. |
Use Scenario: Multi-frequency power delivery for baseband SoC requiring 1.1V core, 1.8V I/O, and 3.3V PHY rails with dynamic load steps. IC Role / Device Role / Timing Role: High-bandwidth current-mode controller supporting 2.2MHz CH2 for fast transient response on core rail. Use Value: Independent frequency programming (CH1 = 550kHz, CH2 = 2.2MHz) balances efficiency and transient performance across rails. |
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 |
|---|---|---|---|
| LT3692AEUH#PBF | Same silicon, rated for 0°C to 125°C junction (vs. –40°C to 125°C for LT3692AIUH#PBF) | Not suitable for cold-start automotive or extended industrial environments requiring –40°C operation | Select LT3692AIUH#PBF when guaranteed operation at –40°C ambient is required; EUH grade lacks full industrial temp qualification. |
| LT3692AHUH#PBF | Same silicon, rated for –40°C to 150°C junction (higher thermal rating) | Supports higher ambient temperatures (e.g., under-hood, enclosed enclosures) but costs more | Choose AHUH only if system-level thermal analysis confirms sustained >125°C junction temperature; otherwise IUH offers optimal cost/performance balance. |
Compared with LT3692AEUH#PBF and LT3692AHUH#PBF, the LT3692AIUH#PBF uniquely guarantees full –40°C to 125°C operation with no derating, making it the preferred choice for automotive infotainment, industrial automation, and outdoor telecom equipment where wide temperature compliance is mandatory.
Availability
LT3692AIUH#PBF is available at Aetrix Electronics and suitable for automotive ADAS systems, industrial PLCs, medical imaging devices, and telecom baseband processors requiring stable component supply, long-term lifecycle assurance, and AEC-Q200-aligned reliability.
Supply support for LT3692AIUH#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 full product support, documentation, and manufacturing continuity for the LT® portfolio. Linear's legacy expertise in precision power management remains integral to ADI's high-reliability analog roadmap.
The LT3692A product line was designed specifically for demanding dual-output DC/DC conversion in automotive, industrial, and medical systems - emphasizing independent channel control, thermal resilience, and layout-friendly integration in compact QFN packages.
FAQ
What is the guaranteed operating temperature range for LT3692AIUH#PBF?
The LT3692AIUH#PBF is fully specified and guaranteed over a junction temperature range of –40°C to +125°C. This rating is validated through characterization and statistical process control, unlike the EUH grade which is only assured from 0°C to 125°C. The device's thermal performance relies on proper soldering of the exposed pad to a thermally robust PCB plane.
How does the LT3692AIUH#PBF achieve antiphase switching between channels?
The LT3692AIUH#PBF maintains a fixed 180° phase relationship between Channel 1 and Channel 2 by deriving CH2's clock directly from the master oscillator with an inherent half-cycle delay. This architecture is preserved whether frequency is set by RT/SYNC resistor or external clock, ensuring consistent ripple cancellation and reduced input capacitor stress across all operating modes.
Can the LT3692AIUH#PBF be used for output voltage tracking, and how is it implemented?
Yes - the LT3692AIUH#PBF supports precise output voltage tracking via its independent soft-start (SS1/SS2) pins. Connecting SS1 and SS2 together forces both channels to ramp their outputs simultaneously, achieving sub-1% tracking error. Alternatively, resistor dividers on FB1/FB2 referenced to the same SS node enable ratio-metric tracking for asymmetric voltages like 3.3V/1.2V.
What is the function of the TJ pin on the LT3692AIUH#PBF, and how is it calibrated?
The TJ pin on the LT3692AIUH#PBF outputs an analog voltage proportional to die junction temperature: 250mV at 25°C with a slope of 10mV/°C. It is factory-calibrated and requires no external components. Designers can monitor this pin with an ADC to implement thermal throttling, fault logging, or predictive maintenance - critical in sealed or fanless systems.
Does the LT3692AIUH#PBF support synchronization to an external clock, and what are the timing constraints?
Yes - the LT3692AIUH#PBF accepts external synchronization on the RT/SYNC pin across 250kHz–2MHz. Synchronization occurs on the rising edge of the input clock; the internal AGC loop automatically adjusts slope compensation to prevent subharmonic oscillation. Clock source impedance should be low enough to ensure the RT/SYNC pin voltage remains within valid logic thresholds during synchronization.
LT3692AIUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN 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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 34.2V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 110kHz ~ 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LT3692AIUH#PBF FAQ
1.How can I place an order for LT3692AIUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3692AIUH#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 LT3692AIUH#PBF reliable?
The price and inventory of LT3692AIUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3692AIUH#PBF is usually 5 days.
3.What payment methods are accepted for LT3692AIUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3692AIUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3692AIUH#PBF?
LT3692AIUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3692AIUH#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 LT3692AIUH#PBF?
For technical support, including LT3692AIUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3692AIUH#PBF requirements.
6.How does Aetrix verify that LT3692AIUH#PBF is sourced from the original manufacturer or authorized distributors?
All LT3692AIUH#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 LT3692AIUH#PBF meets industry standards.
7.What is the process for return or replacement of LT3692AIUH#PBF?
All LT3692AIUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3692AIUH#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 LT3692AIUH#PBF part is unused and in its original packaging.
Return procedure for LT3692AIUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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