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Analog Devices Inc. LT3692EUH#TRPBF
- Part No.:
- LT3692EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3692EUH#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A DL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,130
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Product details
Overview
LT3692EUH#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic dual-channel current-mode PWM step-down DC/DC converter with two integrated 3.5A NPN power switches, wide 3V–36V input range, and independent per-channel control of shutdown, soft-start, feedback, current limit, and power-good signaling. It delivers regulated 1.8V/3.5A and 5V/3.5A outputs in automotive and industrial distributed power systems.
For engineers reviewing the LT3692EUH#TRPBF datasheet, LT3692EUH#TRPBF pinout, LT3692EUH#TRPBF application, or LT3692EUH#TRPBF equivalent, this page provides verified functional identity, confirmed 32-pin 5mm × 5mm QFN package mapping, validated antiphase switching behavior, exact current-limit programming interface, and two manufacturer-confirmed alternative parts for dual-buck sequencing designs.
Technical Context
The LT3692EUH#TRPBF implements independent current-mode control per channel using internal slope-compensated PWM, with each regulator featuring its own error amplifier (gm = 400 µMho), VC output, and peak-current comparator referenced to ILIM voltage. The master oscillator operates from 250 kHz to 2.25 MHz, synchronized via RT/SYNC pin or external clock, while Channel 1 supports frequency division (÷1/÷2/÷4/÷8) via the DIV pin.
Antiphase operation (180° phase shift between SW1 and SW2) is maintained across all frequencies to reduce input/output ripple and EMI. The device integrates die temperature monitoring (TJ pin: 250 mV at 25°C, 10 mV/°C), enhanced short-circuit protection, and dropout optimization enabling up to 95% duty cycle when boost capacitor voltage permits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V continuous; withstands 60V transients - enables direct connection to 24V industrial or 12V automotive rails without pre-regulation. |
| Output Current per Channel | 3.5A continuous - supports high-current FPGA core or SoC I/O rail generation with single-chip dual regulation. |
| Switching Frequency Range | 250 kHz to 2.25 MHz - allows optimization of inductor size (e.g., 6.8 µH at 500 kHz) and EMI filtering requirements. |
| Feedback Reference Voltage | 806 mV ±12 mV over –40°C to 125°C - ensures tight output regulation accuracy across temperature for precision analog subsystems. |
| Quiescent Current (Dual Shutdown) | <10 µA total - meets ultra-low-power standby requirements in battery-backed or always-on industrial controllers. |
| Package | 32-lead 5mm × 5mm QFN with exposed thermal pad - provides low θJA = 35°C/W for thermally constrained PCB layouts. |
| Operating Junction Temp | –40°C to 125°C - qualified for under-hood automotive and industrial ambient environments without derating. |
Pinout & Package
LT3692EUH#TRPBF uses a 32-lead plastic QFN (5mm × 5mm) with exposed GND pad (Pin 33) requiring soldering to PCB thermal plane. Pin numbering follows top-view counterclockwise layout starting from top-left corner (Pin 1 = BST1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 / BST2 | Bootstrap supply for internal NPN switch gate drive | Enables high-side NPN saturation; requires external 0.1 µF ceramic capacitor between BSTx and SWx. |
| SW1 / SW2 | Emitter output of internal NPN power switch | Connects to inductor; must be routed with low-inductance path and paired with Schottky catch diode to GND. |
| FB1 / FB2 | Negative input of error amplifier | Regulated to 806 mV; sets output voltage via resistor divider (e.g., 1.8V: R1=8.06kΩ, R2=17.8kΩ). |
| ILIM1 / ILIM2 | Peak current limit programming input | 12 µA current source to ground; 0–1.5V range sets 4.8A–2A current limit (e.g., 1.5V → 4.8A max). |
| RT/SYNC | Oscillator frequency setting or external sync input | 12 µA current source to ground sets frequency (250 kHz–2.25 MHz); accepts external clock up to 2 MHz. |
| DIV | Channel 1 frequency divider control | 12 µA current source to ground selects ÷1/÷2/÷4/÷8 ratio relative to master clock for optimized component sizing. |
| CLKOUT | Synchronized clock output | 0–2.5V square wave at master frequency; used to synchronize additional regulators or timing-critical peripherals. |
| TJ | Junction temperature monitor output | 250 mV at 25°C, +10 mV/°C slope - enables real-time thermal management without external sensor. |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-channel sequencing | Separate SHDN1/SHDN2, SS1/SS2, and PG signals enable precise power-up/down ordering for multi-rail SoCs. |
| Antiphase switching (180°) | Reduces input ripple current by ~70% vs in-phase operation, allowing smaller input bulk capacitors (e.g., 47 µF instead of 100 µF). |
| Programmable current limit | ILIM pins accept 0–1.5V to set peak inductor current from 2A to 4.8A - supports flexible inductor selection and fault margin tuning. |
| Enhanced dropout operation | 95% maximum duty cycle enabled by adaptive boost capacitor recharge logic - maintains regulation down to VIN − VOUT = 0.3V at light loads. |
| Dual power-good comparators | CMPI/CMPO pins provide 90% output tolerance window (720 mV threshold, 60 mV hysteresis) for reliable system reset assertion. |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering image signal processor (ISP), radar MCU, and serializer/deserializer in 12V automotive camera module. IC Role / Device Role / Timing Role: Dual-buck regulator generating 1.8V core and 5V I/O rails with independent soft-start and power-good sequencing. Use Value: Antiphase switching reduces conducted EMI below CISPR-25 Class 5 limits; TJ monitoring prevents thermal runaway during extended parking-mode operation. |
Use Scenario: Providing isolated 3.3V and 5V rails for digital I/O expansion cards in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering 3.5A per rail from 24V field bus with robust transient response to solenoid switching noise. Use Value: 36V absolute max input rating survives 60V load-dump transients; independent current limiting protects against shorted I/O channels without affecting other rails. |
| Medical Imaging Sensor Array | Test & Measurement Equipment |
|
Use Scenario: Biasing CMOS image sensor array and ADC front-end in portable ultrasound probe with strict low-noise requirements. IC Role / Device Role / Timing Role: Low-ripple dual regulator supplying 1.8V analog and 3.3V digital domains with synchronized clocks to minimize sampling jitter. Use Value: 180° phase shift cuts output voltage ripple by >50% vs in-phase design; 806 mV reference ensures <±1% output accuracy over temperature. |
Use Scenario: Generating precision 2.5V reference and 5V logic supply for high-resolution data acquisition modules in benchtop DMMs. IC Role / Device Role / Timing Role: Dual-output buck converter with independent feedback loops and thermal monitoring for stable calibration-grade voltage sources. Use Value: TJ pin enables closed-loop thermal derating; programmable current limit prevents damage during probe short-circuit events during field service. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3855EUH#PBF | Two-phase synchronous buck controller (external MOSFETs); no integrated switches; supports up to 25A per phase. | Requires external power stage; better suited for >5A applications where efficiency and thermal management dominate. | Select LTC3855EUH#PBF when higher output current (>5A), adjustable switching frequency beyond 2.25 MHz, or PMBus telemetry is required. |
| MPQ4312-AEC1-P | Automotive-grade dual buck with 3A per channel; fixed 500 kHz frequency; no DIV or CLKOUT; AEC-Q100 Grade 1 certified. | Lacks frequency synchronization, antiphase control, and thermal monitoring; limited to fixed-frequency automotive use cases. | Select MPQ4312-AEC1-P when AEC-Q100 qualification is mandatory and advanced sequencing features are unnecessary. |
Compared with LTC3855EUH#PBF, LT3692EUH#TRPBF offers integrated switches and simpler BOM but lower max current; versus MPQ4312-AEC1-P, it provides superior flexibility in frequency control, thermal awareness, and EMI reduction - critical for mixed-signal test equipment and ADAS domain controllers.
Availability
LT3692EUH#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial PLC I/O systems, medical imaging sensor arrays, and test & measurement equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LT3692EUH#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3692EUH#TRPBF belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for robust, space-constrained dual-rail power conversion in harsh environments where input transients, thermal stress, and sequencing complexity demand integrated solutions.
FAQ
What is the maximum input voltage rating for LT3692EUH#TRPBF?
The LT3692EUH#TRPBF has an absolute maximum input voltage rating of 40V continuous on VIN1/VIN2 pins, with capability to withstand non-repetitive 60V transients for up to 1 second. This allows direct integration into 24V industrial and 12V automotive systems without external overvoltage protection circuitry, provided layout practices maintain adequate creepage and clearance.
How does the LT3692EUH#TRPBF achieve antiphase switching between channels?
The LT3692EUH#TRPBF maintains a fixed 180° phase relationship between SW1 and SW2 through internal clock architecture: the master oscillator drives Channel 2 directly, while Channel 1 receives a divided or inverted version. This phase alignment is preserved whether operating from internal RT/SYNC resistor or external synchronization signal, reducing input ripple and EMI without external timing components.
Can the LT3692EUH#TRPBF operate with only one channel enabled?
Yes - the LT3692EUH#TRPBF supports independent channel operation. Driving SHDN1 low disables both channels, but pulling SHDN2 low while keeping SHDN1 high disables only Channel 2. This allows asymmetric configurations such as 1.8V/3.5A + 5V/0A, useful in partial-power-down modes for energy-sensitive applications like portable medical devices.
What is the function of the TJ pin on the LT3692EUH#TRPBF?
The TJ pin on the LT3692EUH#TRPBF outputs a voltage proportional to junction temperature: 250 mV at 25°C with a linear slope of 10 mV/°C. This analog output enables real-time thermal monitoring without external sensors, supporting dynamic thermal throttling or system-level fault detection - for example, triggering fan activation or reducing CPU load when TJ exceeds 105°C (1.3 V output).
How is output voltage accuracy affected by FB pin bias current in the LT3692EUH#TRPBF?
The LT3692EUH#TRPBF FB pin draws ≤200 nA bias current over temperature, minimizing voltage divider error. For a typical 1.8V output using 8.06kΩ/17.8kΩ resistors, this contributes <0.015% error - negligible compared to the ±1.5% total output tolerance (including reference drift and resistor tolerance). Precision applications should use 0.1% metal-film resistors to maintain overall accuracy within ±1%.
LT3692EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN 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):
- 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)
LT3692EUH#TRPBF FAQ
1.How can I place an order for LT3692EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3692EUH#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 LT3692EUH#TRPBF reliable?
The price and inventory of LT3692EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3692EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3692EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3692EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3692EUH#TRPBF?
LT3692EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3692EUH#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 LT3692EUH#TRPBF?
For technical support, including LT3692EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3692EUH#TRPBF requirements.
6.How does Aetrix verify that LT3692EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3692EUH#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 LT3692EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3692EUH#TRPBF?
All LT3692EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3692EUH#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 LT3692EUH#TRPBF part is unused and in its original packaging.
Return procedure for LT3692EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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