My Inquiry
My Account
Analog Devices Inc. LT3692IUH#TRPBF
- Part No.:
- LT3692IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3692IUH#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A DL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,521
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3692IUH#TRPBF 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, operating from 3V to 36V input and delivering up to 3.5A per channel at independently programmable output voltages (e.g., 1.8V and 5V). It features antiphase switching, 180° channel phase alignment, and integrated die temperature monitoring via the TJ pin - used in automotive infotainment power rails and industrial distributed supplies.
For engineers reviewing the LT3692IUH#TRPBF datasheet, LT3692IUH#TRPBF pinout, LT3692IUH#TRPBF application, or LT3692IUH#TRPBF equivalent, key selection criteria include independent soft-start/enable control per channel, programmable current limit (2A–4.8A), synchronization capability (250kHz–2.25MHz), and thermal shutdown with junction temperature reporting (250mV @ 25°C, 10mV/°C slope).
Technical Context
The LT3692IUH#TRPBF implements dual independent current-mode control loops with separate VC error amplifier outputs, ILIM-set peak current limits, and antiphase clock generation - maintaining fixed 180° phase shift across all operating frequencies to reduce input/output ripple. Its internal oscillator supports resistor-programmed (250kHz–2.25MHz) or external clock synchronization, with DIV pin enabling frequency division (×1/2/4/8) for Channel 1 only.
Each channel integrates dedicated undervoltage lockout (2.8V min), overvoltage protection (38V threshold), and comparator-based power-good signaling (CMPI/CMPO pins with 720mV threshold and 60mV hysteresis). The device uses boost-capacitor-assisted dropout enhancement, allowing >95% duty cycle operation when VIN–VOUT is minimal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V continuous; withstands 60V transients - enables direct connection to 12V/24V automotive or industrial bus without pre-regulation. |
| Output Current per Channel | Up to 3.5A continuous - supported by internal 3.8A NPN switches and thermal design with exposed pad (θJA = 35°C/W). |
| Switching Frequency Range | 250kHz to 2.25MHz, programmable via RT/SYNC resistor or external clock - allows optimization of inductor size and EMI performance. |
| Feedback Reference Voltage | 806mV ±12mV over –40°C to 125°C - sets precise output regulation point; enables standard resistor-divider design for any VOUT ≥0.8V. |
| Junction Temperature Sensing | TJ pin outputs 250mV at 25°C with 10mV/°C slope - provides real-time die temperature monitoring for thermal management without external sensor. |
| Quiescent Current (Both Channels Off) | <10µA total - achieved by deep shutdown mode triggered via SHDN1, critical for battery-backed systems requiring ultra-low standby loss. |
| Phase Relationship | Fixed 180° antiphase between channels - reduces input capacitor RMS current and output voltage ripple without additional filtering. |
Pinout & Package
LT3692IUH#TRPBF is housed in a thermally enhanced 32-lead 5mm × 5mm plastic QFN package with exposed pad (Pin 33) that must be soldered to PCB ground for thermal and electrical integrity. Pin count and layout match LT3692EUH#TRPBF; both share identical mechanical footprint and thermal characteristics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1/BST2 | Bootstrap supply for NPN base drive | Enables low RCE(SAT) operation; requires external ceramic capacitor (typically 0.1µF) from BSTx to SWx. |
| SW1/SW2 | Emitter of internal NPN power switch | High dV/dt node; requires Schottky catch diode to GND and local high-frequency decoupling. |
| FB1/FB2 | Negative input of error amplifier | Regulated to 806mV; bias current flows out - defines output voltage via resistive divider to VOUTx. |
| ILIM1/ILIM2 | Peak current limit programming input | Driven by 12µA internal current source; 0V–1.5V range sets 4.8A–2A current limit - enables load-current tailoring. |
| RT/SYNC | Oscillator frequency control / sync input | Accepts resistor-to-GND (250kHz–2.25MHz) or external clock (250kHz–2MHz); rising-edge synchronized. |
| DIV | Channel 1 frequency divider select | 12µA current source to GND resistor sets ÷1/÷2/÷4/÷8 ratio - optimizes component count in multi-rail systems. |
| CLKOUT | Synchronized master clock output | 0V–2.5V square wave; matches RT/SYNC frequency and duty cycle - enables system-wide clock coordination. |
| TJ | Junction temperature monitor output | 250mV @ 25°C, +10mV/°C slope - enables closed-loop thermal throttling or fault logging without external IC. |
| SHDN1/SHDN2 | Channel enable/disable control | SHDN1 controls both channels; threshold 1.32V typical - allows independent sequencing or full-system shutdown. |
| VIN1/VIN2 | Power inputs for control logic / power stage | VIN1 powers internal regulators and must exceed 2.8V for VIN2 operation - enforces safe power-up order. |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-channel control | Separate SHDN, SS, FB, ILIM, CMPI/CMPO, and VC pins allow fully autonomous regulation, sequencing, and fault reporting for each output rail. |
| Antiphase switching architecture | Maintains 180° phase offset across full frequency range - cuts input capacitor RMS current by ~30% and reduces output ripple amplitude. |
| Programmable current limit (2A–4.8A) | Set via 0–1.5V on ILIMx pins using single resistor - avoids overdesign of magnetics and enables precise current limiting for diverse loads. |
| Integrated die temperature sensing | TJ pin delivers calibrated analog voltage (250mV @ 25°C, ±60mV error) - eliminates need for external thermal sensor in space-constrained designs. |
| Dropout-enhanced operation | Supports >95% duty cycle by holding switch on across multiple cycles when boost capacitor voltage remains sufficient - extends regulation at low VIN–VOUT. |
| Robust protection suite | Includes UVLO (2.8V), OVLO (38V), thermal shutdown, short-circuit detection, and soft-start POR latch - ensures reliable startup under varying line/load conditions. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Dual-rail power for MCU core (1.8V/3.5A) and interface peripherals (5V/3.5A) in head-unit ECUs exposed to 12V battery fluctuations and load-dump transients. IC Role / Device Role: Primary buck regulator providing regulated, sequenced, and monitored outputs with transient immunity up to 60V. Use Value: Integrated OVLO/UVLO and antiphase operation eliminate need for external TVS and reduce input capacitance by 40%, lowering BOM cost and board area. |
Use Scenario: Compact dual-output supply for isolated digital I/O banks in DIN-rail mounted controllers requiring stable 3.3V and 5V rails under wide ambient temperature (–40°C to 85°C). IC Role / Device Role: Monolithic dual buck controller with TJ monitoring and independent soft-start for cold-start reliability and thermal derating. Use Value: On-die temperature sensing enables dynamic current derating without external ADC, while 180° phase reduces heatsink requirements by lowering RMS input current. |
| Medical Imaging Sensor Interface | Test Equipment Power Subsystem |
|
Use Scenario: Low-noise, low-ripple dual supply for high-resolution ADC front-ends and FPGA configuration in portable ultrasound probes. IC Role / Device Role: Precision-regulated, synchronized buck converter with programmable frequency to avoid sensitive bands and minimize conducted EMI. Use Value: External clock synchronization (via RT/SYNC) allows alignment with system sampling clock, eliminating beat frequencies and improving SNR by >3dB. |
Use Scenario: Modular bench power supply module generating adjustable 1.2V–5V rails with current limiting and thermal telemetry for automated test fixtures. IC Role / Device Role: Programmable dual buck controller with ILIM-based current limiting and TJ feedback for self-monitoring and fault logging. Use Value: ILIM pin enables software-configurable current limits via DAC, while TJ output feeds host microcontroller for predictive maintenance and thermal profiling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EUF#PBF | Single-channel 3A buck with integrated MOSFETs; no antiphase or dual independent control; smaller 24-lead QFN (4mm × 4mm). | Lacks dual-rail flexibility and channel sequencing; suitable only when one regulated rail suffices. | Select LTC3631EUF#PBF only if system requires single output and board space is constrained - cannot replace LT3692IUH#TRPBF in dual-rail architectures. |
| TPS544B20RNQT | Single-channel 4A synchronous buck with PMBus interface; no integrated temperature sensor or antiphase capability; requires external compensation. | Offers digital control and telemetry but no dual-channel integration - demands two ICs for dual-rail use. | Choose TPS544B20RNQT when digital configurability and telemetry outweigh integration benefits; not a functional substitute for LT3692IUH#TRPBF's dual-channel autonomy. |
Compared with LTC3631EUF#PBF and TPS544B20RNQT, the LT3692IUH#TRPBF uniquely delivers true dual-channel independence - including separate soft-start, current limit, and power-good signaling - within a single 5mm × 5mm QFN, reducing component count and inter-rail coupling in space- and reliability-critical designs.
Availability
LT3692IUH#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC modules, and medical imaging equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3692IUH#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3692 product line was designed by Linear Technology specifically for high-reliability dual-rail power conversion in automotive and industrial environments - emphasizing thermal robustness, transient immunity, and autonomous channel control without external sequencing logic.
FAQ
What is the guaranteed operating temperature range for the LT3692IUH#TRPBF?
The LT3692IUH#TRPBF is fully specified and guaranteed over the industrial temperature range of –40°C to 125°C junction temperature. Unlike the EUH grade (0°C to 125°C), the IUH variant undergoes full characterization and testing across this extended range, making it suitable for under-hood automotive and harsh-environment industrial applications where ambient temperatures exceed 85°C.
Can the LT3692IUH#TRPBF operate with only one channel enabled?
Yes, the LT3692IUH#TRPBF supports independent channel operation: SHDN1 controls both channels, but SHDN2 can be used to disable Channel 2 while keeping Channel 1 active. When SHDN2 is pulled low and SHDN1 remains high, Channel 1 continues regulation with full functionality (soft-start, current limit, power-good), while Channel 2 enters high-impedance shutdown - enabling flexible power sequencing in multi-rail systems.
How does the LT3692IUH#TRPBF achieve <10µA quiescent current in shutdown?
The LT3692IUH#TRPBF achieves <10µA total shutdown current by disabling internal bias circuits, oscillator, and error amplifiers when SHDN1 falls below 0.6V. In this state, VIN1 draws ~6µA and VIN2 draws <1µA - verified across –40°C to 125°C. This ultra-low IQ mode is critical for always-on subsystems such as automotive body controllers or IoT edge nodes with coin-cell backup.
What is the function of the DIV pin on the LT3692IUH#TRPBF?
The DIV pin on the LT3692IUH#TRPBF selects the frequency division ratio for Channel 1 relative to the master clock (set by RT/SYNC). Driven by a 12µA internal current source, connecting a resistor from DIV to GND sets thresholds for ÷1, ÷2, ÷4, or ÷8 operation - allowing Channel 1 to run at half, quarter, or eighth the frequency of Channel 2. This optimizes inductor size and EMI in asymmetric rail configurations (e.g., 1.8V/3.5A at 1MHz and 5V/3.5A at 500kHz).
Does the LT3692IUH#TRPBF support external clock synchronization, and what are the timing requirements?
Yes, the LT3692IUH#TRPBF supports external clock synchronization via the RT/SYNC pin, accepting signals from 250kHz to 2MHz. Synchronization occurs on the rising edge of the external clock, with tDRTSYNCH = 300ns (rising) and tDRTSYNCL = 150ns (falling). The external clock source impedance must be chosen so its current into RT/SYNC approximates the internal 12µA reference - ensuring seamless transition between free-running and synchronized modes without output disturbance.
LT3692IUH#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)
LT3692IUH#TRPBF FAQ
1.How can I place an order for LT3692IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3692IUH#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 LT3692IUH#TRPBF reliable?
The price and inventory of LT3692IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3692IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3692IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3692IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3692IUH#TRPBF?
LT3692IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3692IUH#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 LT3692IUH#TRPBF?
For technical support, including LT3692IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3692IUH#TRPBF requirements.
6.How does Aetrix verify that LT3692IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3692IUH#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 LT3692IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3692IUH#TRPBF?
All LT3692IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3692IUH#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 LT3692IUH#TRPBF part is unused and in its original packaging.
Return procedure for LT3692IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3692IUH#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
