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Analog Devices Inc. LT3692AEFE#PBF
- Part No.:
- LT3692AEFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3692AEFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A DL 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,058
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Product details
Overview
LT3692AEFE#PBF from Analog Devices (formerly Linear Technology) is a dual-channel monolithic 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 antiphase switching at 180° for reduced output ripple. Used in automotive multi-rail power systems requiring precise tracking and sequencing.
For engineers reviewing the LT3692AEFE#PBF datasheet, LT3692AEFE#PBF pinout, LT3692AEFE#PBF application, or LT3692AEFE#PBF equivalent, key selection considerations include its 38-pin TSSOP exposed-pad package, –40°C to 125°C junction temperature rating, independent frequency programming (250kHz–2MHz), and dual-channel antiphase synchronization capability for low-ripple distributed regulation.
Technical Context
The LT3692AEFE#PBF implements dual independent current-mode control loops with separate VC, FB, ILIM, SS, SHDN, and CMPI/CMPO pins per channel - enabling flexible tracking, sequencing, and fault monitoring. Its internal oscillator supports resistor-set (250kHz–2MHz) or external clock synchronization, with DIV pin-selectable frequency division (×1/2/4/8) for Channel 1 while maintaining strict 180° phase offset between channels.
Each channel integrates a high-side NPN switch with BST bootstrap drive, die temperature sensing via TJ pin (250mV @ 25°C, 10mV/°C), and FMEA-compliant design. Minimum on-time is 140ns, dropout is enhanced via 95% max duty cycle, and VIN1 must exceed 2.8V to enable VIN2 operation and shared bias circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V continuous; withstands 60V transients - enables direct connection to automotive battery rails without pre-regulation. |
| Output Current per Channel | Up to 3.5A - sufficient for powering core logic, memory, and I/O rails in industrial controllers and ADAS modules. |
| Switching Frequency Range | 250kHz to 2.5MHz - allows optimization of inductor size and EMI filtering across wide load and input conditions. |
| Feedback Reference Voltage | 806mV ±16mV over temperature - ensures tight output voltage regulation accuracy for sensitive analog and digital loads. |
| Junction Temperature Range | –40°C to 125°C - qualified for under-hood automotive and industrial environments with thermal derating support. |
| Quiescent Current (Shutdown) | <10µA total - critical for always-on subsystems requiring ultra-low standby power consumption. |
| Phase Relationship | 180° antiphase switching - reduces input capacitor RMS current and output voltage ripple by canceling harmonic components. |
Pinout & Package
LT3692AEFE#PBF uses a 38-lead plastic TSSOP package with exposed pad (Pin 39 = GND), optimized for thermal performance (θJA = 17.5°C/W). The exposed pad must be soldered to PCB ground plane for reliable thermal management and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 39) | Power and signal reference ground | Exposed thermal pad; sole ground return path - requires low-impedance PCB copper connection to minimize noise and thermal resistance. |
| VIN1 (Pin 25) | Main supply input | Powers internal bias circuitry, oscillator, and Channel 1 switch; must exceed 2.8V to enable full device operation including VIN2. |
| VIN2 (Pin 19) | Channel 2 supply input | Supplies only Channel 2 power stage; dependent on VIN1 being active - enables independent input rail sourcing. |
| SHDN1/SHDN2 (Pins 24/17) | Independent channel enable control | SHDN1 controls both channels; SHDN2 enables only Channel 2 - supports asymmetric power-up sequencing. |
| FB1/FB2 (Pins 12/10) | Error amplifier inverting input | Regulates output to 806mV reference; bias current flows out - enables standard resistive divider feedback networks. |
| ILIM1/ILIM2 (Pins 13/3) | Peak current limit programming | 12µA internal current source into external resistor sets 2A–4.8A current limit range - provides precise overcurrent protection tuning. |
| RT/SYNC (Pin 21) | Oscillator frequency control | 12µA current source into resistor sets 250kHz–2.5MHz; accepts external clock for system-wide synchronization. |
| DIV (Pin 20) | Channel 1 frequency divider select | 12µA current source into resistor selects ×1/2/4/8 division ratio - enables optimal component sizing per channel. |
| TJ (Pin 22) | Die temperature monitor | 250mV @ 25°C, 10mV/°C linear output - enables real-time thermal monitoring and system-level thermal throttling. |
Key Features
| Feature | Design Value |
|---|---|
| Independent channel control | Separate SHDN, SS, FB, ILIM, CMPI/CMPO, and VC pins per channel - enables asymmetric start-up, tracking, and fault handling without external logic. |
| Antiphase 180° switching | Maintains fixed 180° phase offset across full frequency range - reduces input capacitor stress and output ripple amplitude by up to 50% vs in-phase operation. |
| Programmable current limit | 2A to 4.8A per channel via single resistor on ILIM pin - eliminates need for external sense resistors or current-limit ICs. |
| Integrated temperature sensing | Linear TJ output (250mV @ 25°C, 10mV/°C) with ±100mV error over –40°C to 125°C - enables accurate thermal margining without external sensors. |
| Low dropout operation | 95% maximum duty cycle with boost capacitor recharge management - supports high-VIN/low-VOUT conversion (e.g., 12V → 1.2V) without external LDO assist. |
Applications
| Automotive ADAS Power Supply | Industrial PLC Dual-Rail Core Logic |
|---|---|
Use Scenario: Powering camera sensor, ISP, and radar processor in a front-facing ADAS module with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing 3.3V (2.5A) and 1.2V (1A) with antiphase switching to minimize conducted emissions on shared input bus. Use Value: Reduces input capacitor RMS current by ~30% and lowers peak-to-peak output ripple by 40% compared to in-phase dual converters - easing EMI filter design and improving sensor SNR. |
Use Scenario: Generating isolated 5V and 3.3V rails for microcontroller, FPGA, and communication interfaces in an industrial programmable logic controller. IC Role / Device Role / Timing Role: Independent tracking regulator with programmable soft-start and UVLO - enabling controlled power-up sequence across multiple voltage domains. Use Value: Eliminates need for external sequencing ICs or discrete MOSFETs; reduces BOM count by 4 components and PCB area by 25% versus discrete solutions. |
| Medical Imaging Sensor Bias | Telecom Baseband Processing |
Use Scenario: Supplying low-noise analog front-end and high-speed ADC in portable ultrasound equipment requiring stable, low-ripple bias rails. IC Role / Device Role / Timing Role: Dual synchronous buck with TJ monitoring and precision 806mV feedback - ensuring consistent output accuracy across operating temperature range. Use Value: Maintains ±1.5% output regulation over –40°C to 125°C ambient - critical for maintaining ADC ENOB and image fidelity during field deployment. |
Use Scenario: Delivering tightly regulated 1.8V and 2.5V supplies to baseband processors and RF transceivers in small-cell wireless infrastructure. IC Role / Device Role / Timing Role: Synchronized dual converter with CLKOUT pin - enabling timing alignment with system clock domain for deterministic power delivery. Use Value: CLKOUT output mirrors master switching frequency with <150ns delay variation - supports jitter-sensitive clock distribution and dynamic voltage scaling coordination. |
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 |
|---|---|---|---|
| LTC3892EFE#PBF | Two-phase synchronous buck controller (external MOSFETs); higher efficiency at >5A; no integrated switches | Requires external power stage; better suited for high-current (>5A), high-efficiency telecom applications | Select when >5A per rail or >95% efficiency at full load is required; not drop-in due to external FET dependency. |
| TPS544B20RTWR | Single-channel 4A synchronous buck with PMBus interface; no second channel or antiphase capability | Lacks dual-channel integration and sequencing; adds digital telemetry but increases firmware complexity | Choose when digital monitoring and adaptive voltage scaling are prioritized over dual-rail integration and analog simplicity. |
Compared with LTC3892EFE#PBF and TPS544B20RTWR, the LT3692AEFE#PBF delivers integrated dual-channel power conversion in a single 38-pin TSSOP package with built-in antiphase timing, eliminating external gate drivers and sequencing logic - reducing design risk and time-to-market for space-constrained automotive and industrial applications.
Availability
LT3692AEFE#PBF is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial PLCs, medical imaging systems, and telecom baseband processing requiring stable component supply, extended temperature operation, and dual-rail power integration.
Supply support for LT3692AEFE#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) 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 demanding dual-rail power applications requiring precise tracking, sequencing, and thermal robustness - targeting automotive infotainment, ADAS, and industrial control systems where reliability and integration are critical.
FAQ
What is the maximum allowable input voltage transient for LT3692AEFE#PBF?
The LT3692AEFE#PBF supports nonrepetitive 60V transients on VIN1/VIN2 for up to 1 second, per Absolute Maximum Ratings. Continuous operation is limited to 40V. This 60V transient tolerance enables direct connection to 12V/24V automotive battery rails without additional overvoltage clamping circuitry in most use cases.
Can LT3692AEFE#PBF operate with only one channel enabled?
Yes - LT3692AEFE#PBF supports independent channel operation. Driving SHDN2 low disables only Channel 2, while SHDN1 controls both channels. However, VIN1 must remain above 2.8V to sustain internal bias circuitry; disabling both channels reduces total quiescent current to <10µA.
How does the DIV pin affect switching frequency on LT3692AEFE#PBF?
The DIV pin on LT3692AEFE#PBF sets Channel 1's frequency division ratio (×1, ×2, ×4, or ×8) relative to the master clock set by RT/SYNC. A 12µA internal current source flows into an external resistor to ground, generating voltages that select the ratio: 0.5V (×2), 1.0V (×4), or 1.5V (×8). Channel 2 runs at the master frequency with 180° phase shift.
What is the purpose of the TJ pin on LT3692AEFE#PBF?
The TJ pin on LT3692AEFE#PBF outputs a voltage proportional to die junction temperature: 250mV at 25°C with a slope of 10mV/°C. It provides real-time thermal monitoring for system-level thermal management, enabling dynamic throttling or fault reporting without external sensors - critical for automotive and industrial reliability.
Does LT3692AEFE#PBF support synchronization to an external clock source?
Yes - LT3692AEFE#PBF supports external clock synchronization via the RT/SYNC pin. An external clock applied to RT/SYNC overrides the internal oscillator, locking both channels to the incoming frequency on each rising edge. Slope compensation and 180° phase relationship are automatically maintained during synchronization.
LT3692AEFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 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:
- 38-TSSOP-EP
LT3692AEFE#PBF FAQ
1.How can I place an order for LT3692AEFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3692AEFE#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 LT3692AEFE#PBF reliable?
The price and inventory of LT3692AEFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3692AEFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3692AEFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3692AEFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3692AEFE#PBF?
LT3692AEFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3692AEFE#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 LT3692AEFE#PBF?
For technical support, including LT3692AEFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3692AEFE#PBF requirements.
6.How does Aetrix verify that LT3692AEFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3692AEFE#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 LT3692AEFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3692AEFE#PBF?
All LT3692AEFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3692AEFE#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 LT3692AEFE#PBF part is unused and in its original packaging.
Return procedure for LT3692AEFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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