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Analog Devices Inc. LT3692AHUH#TRPBF
- Part No.:
- LT3692AHUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3692AHUH#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A DL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,662
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Product details
Overview
LT3692AHUH#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. It features independent shutdown, soft-start, UVLO, programmable current limit, and power-good comparators per channel-enabling precise tracking and sequencing in multi-rail power systems for automotive ADAS and industrial control.
For engineers reviewing the LT3692AHUH#TRPBF datasheet, LT3692AHUH#TRPBF pinout, LT3692AHUH#TRPBF application, or LT3692AHUH#TRPBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, antiphase 180° switching for ripple reduction, 250kHz–2MHz programmable/synchronizable frequency, and dual-channel independent regulation with 806mV feedback reference.
Technical Context
The LT3692AHUH#TRPBF implements independent current-mode control per channel with cycle-by-cycle peak current limiting, internal slope compensation, and antiphase clocking maintained across all frequencies. Its master oscillator supports resistor-set (250kHz–2.5MHz) or external synchronization via RT/SYNC, with DIV pin enabling 1×/2×/4×/8× frequency division on Channel 1 only.
Each channel integrates dedicated error amplifiers (400µMho transconductance), programmable current limit (via ILIM pin with 12µA reference), die temperature monitoring (TJ pin: 250mV @ 25°C, 10mV/°C), and independent power-good generation (CMPI/CMPO pins with 720mV threshold and 60mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V continuous; withstands 60V transients - enables direct battery connection in 12V/24V automotive and industrial systems. |
| Output Current per Channel | Up to 3.5A - supports high-current rails like CPU cores or FPGA I/O banks without external MOSFETs. |
| Feedback Reference Voltage | 806mV ±16mV over –40°C to 150°C - ensures stable output regulation across extended temperature range. |
| Switching Frequency Range | 250kHz to 2.5MHz (resistor-programmed) or synchronized externally - allows optimization of efficiency vs. size using small inductors & capacitors. |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Quiescent Current (Shutdown) | <10µA total - preserves battery life in always-on systems such as telematics or sensor nodes. |
| Minimum On-Time | 140ns - supports high step-down ratios (e.g., 36V→1.2V) at high frequencies without pulse-skipping instability. |
Pinout & Package
LT3692AHUH#TRPBF uses a 32-lead 5mm × 5mm plastic QFN package with exposed thermal pad (Pin 33 = GND). The package provides θJA = 23°C/W and θJC(PAD) = 1.5°C/W for robust thermal performance in high-power density designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1/BST2 | Bootstrap supply for NPN base drive | Enables low VCE(sat) operation; requires external ceramic capacitor tied between BST and SW pins. |
| SW1/SW2 | Emitter of internal NPN power switch | Connects to inductor; must be decoupled with Schottky catch diode to ground to clamp negative dV/dt spikes. |
| FB1/FB2 | Negative input of error amplifier | Regulated to 806mV; sets output voltage via resistive divider - defines precision of DC output accuracy. |
| ILIM1/ILIM2 | Peak current limit programming input | 12µA internal current source pulls to ground; resistor sets limit from 2A (0V) to 4.8A (1.5V) - enables per-channel current tailoring. |
| RT/SYNC | Oscillator frequency control / sync input | 12µA current source sets frequency with resistor; accepts external clock (250kHz–2MHz) on rising edge - enables system-level clock alignment. |
| DIV | Channel 1 frequency divider select | 12µA current source sets voltage; resistor to ground selects 1×/2×/4×/8× division - reduces EMI and component count for Channel 1. |
| TJ | Die temperature monitor output | 250mV @ 25°C, 10mV/°C slope - enables real-time thermal protection and derating without external sensors. |
| SHDN1/SHDN2 | Independent channel enable inputs | SHDN1 controls both channels; SHDN2 enables Channel 2 only if SHDN1 >2.8V - supports flexible power sequencing. |
| CLKOUT | Synchronized clock output | 0V–2.5V square wave, phase-locked to Channel 1 - drives additional regulators or timing-critical peripherals. |
| GND (Pin 33) | Power and signal ground | Exposed thermal pad must be soldered to PCB copper - primary path for heat dissipation and low-noise reference return. |
Key Features
| Feature | Design Value |
|---|---|
| Antiphase 180° switching | Reduces input/output voltage ripple by canceling harmonic components - cuts required bulk capacitance by ~50%. |
| Independent channel control | Separate VIN, SHDN, SS, FB, ILIM, CMPI/CMPO per channel - enables asymmetric rail generation (e.g., 3.3V/1.2V) with independent sequencing. |
| Programmable current limit | Per-channel peak current set via ILIM pin (2A–4.8A range) - prevents inductor saturation and enables fault-tolerant design. |
| Flexible tracking & sequencing | SS1/SS2 pins can be tied together for voltage tracking, or driven separately for staggered startup - meets complex power-up requirements in FPGAs and SoCs. |
| Dropout enhancement | 95% max duty cycle with boost capacitor recharging logic - sustains regulation down to VIN – VOUT ≈ 0.3V at light loads. |
| FMEA-compliant design | Includes OVLO (39V), UVLO (2.8V), thermal shutdown, and latch-off on overcurrent - meets ASIL-B functional safety readiness. |
Applications
| Automotive ADAS Camera Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Dual-rail power for image sensor (3.3V) and ISP core (1.2V) in rear-view camera with ambient temperature up to 105°C. IC Role / Device Role / Timing Role: Primary dual-buck regulator providing tightly tracked, sequenced outputs with thermal monitoring and transient robustness. Use Value: Eliminates need for discrete sequencing ICs; TJ pin enables closed-loop thermal management; 60V transient tolerance avoids external TVS. |
Use Scenario: Distributed 5V and 3.3V supplies for digital I/O modules in factory automation cabinets with 85°C ambient. IC Role / Device Role / Timing Role: Compact dual-channel regulator replacing two single-channel ICs, reducing BOM count and PCB area. Use Value: Independent UVLO per channel ensures safe power-up of isolated I/O banks; antiphase operation lowers conducted EMI in noise-sensitive analog sections. |
| Medical Imaging Sensor Array | Telecom Remote Radio Unit |
Use Scenario: Low-noise bias for CMOS sensor array requiring matched 2.5V and 1.8V rails with <±1% output tolerance. IC Role / Device Role / Timing Role: Precision dual-step-down regulator with 806mV reference and <13mV inter-channel FB offset. Use Value: Minimizes inter-rail crosstalk; soft-start synchronization prevents inrush-induced voltage droop on shared input bus. |
Use Scenario: High-efficiency 12V→3.3V and 12V→5V conversion in outdoor RRUs with wide temperature cycling (–40°C to +85°C). IC Role / Device Role / Timing Role: Dual buck controller supporting external synchronization to baseband clock for EMI reduction. Use Value: CLKOUT and RT/SYNC allow deterministic jitter-free clock distribution; 150°C rating ensures reliability in sealed enclosures. |
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 |
|---|---|---|---|
| LTC3892-2 | Two-phase synchronous buck controller (external MOSFETs); supports up to 60V input; no integrated switches. | Better suited for >5A/channel or >40V input; requires external power stage but offers higher efficiency and flexibility. | Select LTC3892-2 when output current exceeds 3.5A or input voltage exceeds 36V; not drop-in due to external FET requirement. |
| TPS544B25 | Single-channel 4A synchronous buck converter with PMBus interface; 4.5V–18V input; no dual-channel or antiphase capability. | Targeted at digitally controlled point-of-load applications; lacks independent sequencing and thermal monitoring. | Choose TPS544B25 only for single-rail, digitally managed systems where telemetry and margining are critical. |
Compared with LTC3892-2 and TPS544B25, the LT3692AHUH#TRPBF delivers integrated dual-channel regulation with antiphase operation and die temperature sensing in a compact QFN - making it optimal for space-constrained, thermally demanding dual-rail applications where simplicity and reliability outweigh programmability needs.
Availability
LT3692AHUH#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS, industrial PLCs, medical imaging, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3692AHUH#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT3692A product line was designed specifically for high-reliability dual-rail power conversion in harsh environments - emphasizing thermal robustness, transient immunity, and independent channel control for mission-critical embedded systems.
FAQ
What is the maximum junction temperature rating for LT3692AHUH#TRPBF?
The LT3692AHUH#TRPBF is rated for operation from –40°C to +150°C junction temperature, verified across production lots and guaranteed by design and characterization. This H-grade qualification makes it suitable for under-hood automotive and high-ambient industrial applications where standard 125°C-rated parts would require derating or forced cooling.
Can LT3692AHUH#TRPBF operate with independent input voltages on VIN1 and VIN2?
Yes, LT3692AHUH#TRPBF supports independent VIN1 (powers control circuitry and Channel 1 switch) and VIN2 (powers Channel 2 switch) supplies. However, VIN1 must exceed 2.8V (typical UVLO threshold) to enable internal bias generation - meaning VIN2 cannot operate unless VIN1 is active and within specification.
How does the DIV pin affect switching frequency on LT3692AHUH#TRPBF?
The DIV pin on LT3692AHUH#TRPBF sets the frequency division ratio for Channel 1 relative to the master clock. With an internal 12µA current source, a resistor from DIV to GND generates voltages that select 1×, 2×, 4×, or 8× division - allowing Channel 1 to run at half, quarter, or eighth the frequency of Channel 2, optimizing EMI and component sizing.
Does LT3692AHUH#TRPBF support external clock synchronization?
Yes, LT3692AHUH#TRPBF supports external synchronization via the RT/SYNC pin, accepting clock signals from 250kHz to 2MHz on the rising edge. When synchronized, Channel 1 remains in phase with the external clock, Channel 2 stays 180° out-of-phase, and internal slope compensation auto-adjusts to prevent subharmonic oscillation.
What is the purpose of the TJ pin on LT3692AHUH#TRPBF?
The TJ pin on LT3692AHUH#TRPBF outputs a voltage proportional to die temperature: 250mV at 25°C with a slope of 10mV/°C. This analog output enables real-time thermal monitoring, closed-loop derating, or overtemperature shutdown using a simple ADC or comparator - eliminating need for external temperature sensors.
LT3692AHUH#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LT3692AHUH#TRPBF FAQ
1.How can I place an order for LT3692AHUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3692AHUH#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 LT3692AHUH#TRPBF reliable?
The price and inventory of LT3692AHUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3692AHUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3692AHUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3692AHUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3692AHUH#TRPBF?
LT3692AHUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3692AHUH#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 LT3692AHUH#TRPBF?
For technical support, including LT3692AHUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3692AHUH#TRPBF requirements.
6.How does Aetrix verify that LT3692AHUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3692AHUH#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 LT3692AHUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3692AHUH#TRPBF?
All LT3692AHUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3692AHUH#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 LT3692AHUH#TRPBF part is unused and in its original packaging.
Return procedure for LT3692AHUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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