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Analog Devices Inc. LT3692EUH#PBF
- Part No.:
- LT3692EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3692EUH#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A DL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,147
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Product details
Overview
LT3692EUH#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, operating from 3V to 36V input and delivering up to 3.5A per channel at 1.8V and 5V outputs. It features independent shutdown, soft-start, programmable current limit, and antiphase switching for reduced input ripple in automotive and industrial distributed power systems.
For engineers reviewing the LT3692EUH#PBF datasheet, LT3692EUH#PBF pinout, LT3692EUH#PBF application, or LT3692EUH#PBF equivalent, key selection criteria include its 250kHz–2.25MHz synchronizable switching frequency, 180° inter-channel phase shift, integrated die temperature monitoring (TJ pin), and dual independent tracking capability with <10µA total quiescent current in shutdown.
Technical Context
The LT3692EUH#PBF implements dual independent current-mode control loops with separate VC error amplifier outputs, ILIM-set peak current limits, and FB-referenced 806mV regulation. Each channel uses slope-compensated current-mode architecture with cycle-by-cycle inductor current sensing via IND pins and internal sense resistors.
Its oscillator supports resistor-programmed (RT/SYNC) or external clock synchronization, with DIV pin enabling 1×/2×/4×/8× frequency division on Channel 1 while maintaining precise 180° phase alignment between channels. The CLKOUT pin provides a synchronized square wave output referenced to Channel 1's timing.
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 | Up to 3.5A - supports high-current digital loads like FPGAs, DSPs, and ASICs with dual-rail requirements. |
| Switching Frequency Range | 250kHz to 2.25MHz - allows optimization of inductor size and EMI filtering across wide load and layout constraints. |
| Feedback Reference Voltage | 806mV ±12mV over temperature - ensures tight output voltage regulation accuracy for precision analog and mixed-signal circuits. |
| Junction Temperature Range | –40°C to 125°C - qualified for under-hood automotive and industrial environments requiring extended thermal operation. |
| Quiescent Current (Shutdown) | <10µA total - minimizes battery drain in always-on systems such as telematics or sensor nodes. |
| Phase Relationship | 180° antiphase switching - reduces input capacitor RMS current and eases input filter design. |
Pinout & Package
LT3692EUH#PBF is housed in a thermally enhanced 32-lead 5mm × 5mm plastic QFN package with exposed pad (Pin 33) soldered to PCB ground for optimal thermal performance (θJA = 35°C/W). All DNC pins must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1/2 | Bootstrap supply for internal NPN switch base drive | Enables low RCE(SAT) operation; requires external ceramic capacitor to SW pin for proper gate drive during high-duty-cycle operation. |
| SW1/2 | Emitter of internal NPN power switch | Connects to inductor; requires external Schottky catch diode to GND to clamp negative voltage spikes during switch-off. |
| FB1/2 | Negative input of error amplifier | Regulated to 806mV; sets output voltage via resistor divider; bias current flows out - affects divider design accuracy. |
| ILIM1/2 | Peak current limit programming input | 12µA internal current source pulls to GND; resistor sets 2A–4.8A current limit range - enables precise overcurrent protection tuning. |
| RT/SYNC | Oscillator frequency control / external sync input | 12µA current source sets frequency via resistor; accepts external clock on rising edge - enables system-level EMI reduction and multi-regulator coordination. |
| DIV | Channel 1 frequency divider ratio select | 12µA current source sets voltage thresholds for ÷1/÷2/÷4/÷8 - allows independent optimization of Channel 1 component size without affecting Channel 2 timing. |
| CLKOUT | Synchronized clock output | 0V–2.5V square wave aligned to Channel 1 switching - used to synchronize auxiliary regulators or ADC sampling clocks. |
| TJ | Die temperature monitor output | 250mV at 25°C, 10mV/°C slope - provides real-time junction temperature feedback for thermal management without external sensors. |
Key Features
| Feature | Design Value |
|---|---|
| Independent channel control | Separate SHDN, SS, ILIM, FB, CMPI/CMPO, and VC pins per channel enable flexible sequencing, tracking, and fault isolation in multi-rail systems. |
| Antiphase switching | Fixed 180° phase offset between channels reduces input capacitor ripple current by ~70%, lowering required capacitance and board area. |
| Programmable current limit | ILIM pin sets peak inductor current from 2A to 4.8A using single resistor - eliminates need for external current-sense amplifiers or shunts. |
| Dual tracking capability | SS1/SS2 pins can be tied together to force coordinated soft-start and output voltage ramping - essential for FPGA core/I/O rail sequencing. |
| Enhanced dropout operation | 95% maximum duty cycle with boost capacitor recharge logic maintains regulation down to VIN – VOUT ≈ 1.8V - improves efficiency in low-VIN/high-VOUT scenarios. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC Dual-Rail Core Supply |
|---|---|
Use Scenario: Powering SoC core (1.8V/3.5A) and I/O (5V/3.5A) rails in head-unit ECUs with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator providing independently sequenced, antiphase-switched outputs with TJ monitoring for thermal derating. Use Value: Reduces input ripple and heatsink requirements while meeting ISO 7637-2 pulse immunity via 60V transient tolerance and robust UVLO/OVLO protection. | Use Scenario: Generating isolated 1.8V and 5V supplies for FPGA-based motion control modules in factory automation cabinets. IC Role / Device Role / Timing Role: Monolithic dual regulator with programmable soft-start and power-good signaling for safe FPGA configuration and runtime supervision. Use Value: Eliminates discrete sequencing ICs and external current-sense circuitry, reducing BOM count and improving reliability in harsh industrial environments. |
| Medical Imaging Sensor Bias Supply | Test Equipment Dual-Channel DUT Power |
Use Scenario: Providing low-noise, tightly regulated 1.8V and 5V bias for high-speed ADC front-ends and analog signal chains in portable ultrasound devices. IC Role / Device Role / Timing Role: Dual-tracking buck converter with independent FB/VC loop access for fine-tuning loop stability and minimizing output noise coupling. Use Value: Achieves <±1% output accuracy and sub-10mV p-p ripple through precision 806mV reference and antiphase operation - critical for SNR preservation. | Use Scenario: Programmable dual-output power source for automated test fixtures requiring independent voltage and current control per DUT rail. IC Role / Device Role / Timing Role: Configurable dual regulator with ILIM-based current limiting and CMPO-driven power-good flags for real-time DUT status monitoring. Use Value: Enables hardware-enforced current capping and autonomous fault detection without host controller intervention - accelerating test throughput and yield analysis. |
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 |
|---|---|---|---|
| LTC3855EUH#PBF | Two-phase, 3.5A/channel, but uses external MOSFETs; no integrated switches; higher external component count. | Targeted at higher-efficiency, higher-current (>5A) applications where thermal management favors discrete FETs. | Select when board space allows larger external FETs and efficiency >94% at full load is mandatory. |
| TPS544B25RQFT | Single-chip dual-output buck with integrated FETs; 4A/channel; fixed 500kHz/1MHz freq; no DIV or CLKOUT; no TJ pin. | Designed for compact consumer electronics; lacks antiphase control, thermal monitoring, and frequency flexibility. | Select for cost-sensitive, space-constrained designs where thermal telemetry and EMI coordination are not required. |
Compared with LTC3855EUH#PBF and TPS544B25RQFT, the LT3692EUH#PBF uniquely combines integrated 3.8A switches, antiphase timing control, die temperature monitoring, and programmable frequency division - making it optimal for thermally constrained, EMI-sensitive dual-rail systems requiring high integration and supervisory features.
Availability
LT3692EUH#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, and medical imaging equipment requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LT3692EUH#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 technical and manufacturing continuity for all Linear power products, including rigorous qualification and long-term product support.
The LT3692EUH#PBF belongs to Linear's high-performance monolithic DC/DC regulator family, designed specifically for demanding automotive, industrial, and medical applications requiring dual-rail power with precision sequencing, thermal awareness, and robust transient handling.
FAQ
What is the maximum supported switching frequency for LT3692EUH#PBF?
The LT3692EUH#PBF supports a maximum switching frequency of 2.25MHz when configured with an appropriate RT/SYNC resistor or external clock signal. At this frequency, minimum on-time (180ns) and off-time (200ns) constraints are met, enabling compact magnetics design while maintaining stable current-mode control across the full input/output range.
How does the DIV pin affect channel timing in LT3692EUH#PBF?
The DIV pin on the LT3692EUH#PBF sets the frequency division ratio for Channel 1 relative to the master clock, supporting ÷1, ÷2, ÷4, or ÷8 via resistor-to-ground. This allows Channel 1 to operate at a lower frequency than Channel 2 - optimizing inductor size and core loss for asymmetric load requirements while preserving the 180° phase relationship.
Can LT3692EUH#PBF operate with only VIN2 powered?
No - the LT3692EUH#PBF requires VIN1 to be above 2.8V to power internal bias circuitry, oscillator, thermometer, and common references. VIN2 alone cannot enable operation; VIN1 must be present and valid before Channel 2 can function, as confirmed in the Block Diagram and Applications Information sections of the datasheet.
What is the purpose of the TJ pin on LT3692EUH#PBF?
The TJ pin on the LT3692EUH#PBF outputs a voltage proportional to die junction temperature: 250mV at 25°C with a slope of 10mV/°C. It provides direct, calibrated thermal feedback without external sensors - enabling real-time thermal throttling, fan control, or safety shutdown in automotive and industrial systems where junction temperature must be actively managed.
Does LT3692EUH#PBF support output voltage tracking between channels?
Yes - the LT3692EUH#PBF supports flexible output voltage tracking via its independent soft-start (SS1/SS2) pins. Connecting SS1 and SS2 together forces coordinated ramping of both outputs, while separate RC networks allow programmable delay or slope differences. This capability is explicitly documented in the Features and Applications sections for FPGA and processor core/I/O rail sequencing.
LT3692EUH#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)
LT3692EUH#PBF FAQ
1.How can I place an order for LT3692EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3692EUH#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 LT3692EUH#PBF reliable?
The price and inventory of LT3692EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3692EUH#PBF is usually 5 days.
3.What payment methods are accepted for LT3692EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3692EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3692EUH#PBF?
LT3692EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3692EUH#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 LT3692EUH#PBF?
For technical support, including LT3692EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3692EUH#PBF requirements.
6.How does Aetrix verify that LT3692EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LT3692EUH#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 LT3692EUH#PBF meets industry standards.
7.What is the process for return or replacement of LT3692EUH#PBF?
All LT3692EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3692EUH#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 LT3692EUH#PBF part is unused and in its original packaging.
Return procedure for LT3692EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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