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Analog Devices Inc. LT3692AIFE#TRPBF
- Part No.:
- LT3692AIFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3692AIFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A DL 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,908
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Product details
Overview
LT3692AIFE#TRPBF 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 ripple-used in automotive multi-rail power supplies and industrial distributed regulation.
For engineers reviewing the LT3692AIFE#TRPBF datasheet, LT3692AIFE#TRPBF pinout, LT3692AIFE#TRPBF application, or LT3692AIFE#TRPBF equivalent, key selection criteria include its 38-pin TSSOP exposed-pad package, –40°C to 125°C junction temperature rating, independent channel synchronization (250kHz–2MHz), and FMEA-compliant design for safety-critical systems.
Technical Context
The LT3692AIFE#TRPBF implements dual independent current-mode control loops with separate VC, FB, ILIM, SS, and SHDN pins per channel-enabling precise tracking, sequencing, and fault isolation. Its master oscillator supports resistor-set (250kHz–2MHz) or external clock synchronization, with DIV-controlled frequency division (×1/2/4/8) on Channel 1 and fixed 180° antiphase relationship to Channel 2.
Each channel integrates a high-side NPN switch with BST bootstrap drive, die temperature monitoring (TJ pin = 250mV @ 25°C, 10mV/°C), and comparator-based power-good signaling (CMPI/CMPO). Minimum on-time is 140ns, dropout is enhanced via 95% max duty cycle, and quiescent current drops to <10µA in full shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V continuous; withstands 60V transients-supports wide automotive and industrial supply rails. |
| Output Current per Channel | Up to 3.5A-enabled by internal 3.8A NPN switches and thermal-aware layout with exposed pad GND. |
| Switching Frequency Range | 250kHz to 2MHz, programmable via RT/SYNC resistor or external clock-optimizes efficiency vs. size trade-off. |
| Channel Phase Relationship | Fixed 180° antiphase-reduces input/output capacitor RMS current and voltage ripple without extra components. |
| Feedback Reference Voltage | 806mV ±16mV over –40°C to 125°C-ensures tight output regulation across temperature and load. |
| Junction Temperature Range | –40°C to 125°C (I-grade)-qualified for automotive and industrial environments with validated thermal derating. |
| Quiescent Current (Full Shutdown) | <10µA-critical for battery-backed or always-on systems requiring ultra-low standby power. |
Pinout & Package
LT3692AIFE#TRPBF uses a 38-lead plastic TSSOP package with exposed pad (pin 39 = GND), θJA = 17.5°C/W, θJC(PAD) = 3°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1/BST2 | Bootstrap supply for NPN gate drive | Enables high-side NPN saturation; requires external ceramic capacitor between BST and SW to sustain >2.2V boost voltage. |
| CMPI1/CMPI2 | Power-good comparator input | 720mV threshold with 60mV hysteresis; tied to FB for ±5% output regulation detection. |
| CMPO1/CMPO2 | Open-collector power-good output | Sinks current when CMPI falls below threshold; can be wire-OR'd for system-level PG assertion. |
| DIV | Channel 1 frequency divider control | Internal 12µA current source sets division ratio (1/2/4/8) via resistor to GND-enables asymmetric channel frequencies. |
| RT/SYNC | Oscillator frequency set/synchronization input | Accepts resistor (250kHz–2MHz) or external clock (250kHz–2MHz); rising-edge synchronized with automatic slope compensation. |
| SHDN1/SHDN2 | Independent channel enable | SHDN1 controls both channels; SHDN2 enables only Channel 2-allows flexible sequencing and fault containment. |
| TJ | Die temperature monitor output | 250mV @ 25°C, 10mV/°C linear output-enables real-time thermal margining and overtemperature protection. |
| VIN1/VIN2 | Channel power inputs | VIN1 powers internal bias circuits (min 2.8V required for VIN2 operation); VIN2 supplies Channel 2's output stage only. |
Key Features
| Feature | Design Value |
|---|---|
| Independent channel control | Separate SHDN, SS, ILIM, FB, VC, CMPI/CMPO per channel-enables asymmetric outputs, staggered start-up, and independent fault response. |
| Antiphase switching | 180° phase shift between channels-halves input capacitor RMS current and reduces EMI without external timing circuitry. |
| Programmable current limit | 4.8A to 2A range via ILIM pin (0–1.5V), 12µA internal current source-supports precise inductor sizing and overload protection. |
| FMEA-compliant architecture | 38-pin TSSOP with exposed pad, integrated thermal monitoring (TJ), and robust OVLO/UVOO-meets ASIL-B functional safety requirements. |
| Low dropout operation | 95% maximum duty cycle enabled by multi-cycle on-time extension-maintains regulation down to VOUT ≈ 0.95 × VIN. |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for camera sensor (3.3V) and SoC core (1.2V) in forward-facing ADAS camera. IC Role / Device Role / Timing Role: Primary dual-output buck regulator providing sequenced, tracked, and monitored power with thermal headroom reporting. Use Value: Antiphase switching cuts input ripple by >50%, reducing bulk capacitance; TJ pin enables real-time die temperature logging for ASIL-B compliance. |
Use Scenario: Distributed 5V and 3.3V regulation across modular I/O slots in a DIN-rail mounted PLC backplane. IC Role / Device Role / Timing Role: Local point-of-load regulator with independent channel enable and fault signaling per slot. Use Value: Independent CMPO outputs allow per-slot power-good status; wide 3V–36V input accommodates 24V industrial bus with transient tolerance. |
| Medical Imaging Sensor Bias | Test Equipment Multi-Voltage Rail |
Use Scenario: Precision analog front-end powering for ultrasound transducer receive chain requiring low-noise 2.5V and clean 1.8V rails. IC Role / Device Role / Timing Role: Dual-channel synchronous buck with independent soft-start and current limiting to prevent inrush-induced signal corruption. Use Value: 140ns minimum on-time supports high-frequency operation (≥2MHz) for compact magnetics; FB offset ≤±13mV ensures matched rail accuracy. |
Use Scenario: Benchtop ATE system requiring stable, independently adjustable 3.3V, 5V, and 12V rails with fast transient response. IC Role / Device Role / Timing Role: Flexible multi-frequency buck controller enabling optimized inductor selection per rail (e.g., 550kHz for 12V, 2.2MHz for 3.3V). Use Value: DIV and RT/SYNC pins allow simultaneous asymmetric frequencies; CLKOUT synchronizes auxiliary regulators for coherent noise management. |
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 external MOSFET drivers (no internal switches); supports higher input (60V) and output current (20A+); requires external power stage. | Better suited for high-power, high-efficiency designs where thermal management and efficiency >95% are critical. | Select LTC3892EFE#PBF when output current exceeds 5A per rail or input exceeds 36V; LT3692AIFE#TRPBF is preferred for space-constrained, integrated-switch solutions. |
| TPS544B20RQFT | Single-channel, 4A integrated buck with PMBus interface; no antiphase or dual-independent control; 4.5V–18V input only. | Targeted at digital power systems requiring telemetry and dynamic voltage scaling-not suitable for dual-rail tracking or wide-input applications. | Choose TPS544B20RQFT only for single-rail, digitally managed systems with narrow input range; LT3692AIFE#TRPBF remains optimal for analog-controlled dual-rail automotive/industrial use. |
Compared with LTC3892EFE#PBF and TPS544B20RQFT, the LT3692AIFE#TRPBF uniquely combines dual independent control, integrated 3.8A switches, 3V–36V input, and FMEA-ready packaging-making it the only drop-in solution for compact, safety-conscious dual-rail designs requiring no external MOSFETs or complex digital infrastructure.
Availability
LT3692AIFE#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial PLC I/O subsystems, and medical imaging equipment requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to 125°C operation.
Supply support for LT3692AIFE#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 and maintains its legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LT3692AIFE#TRPBF belongs to the LT36xx dual buck regulator family, designed specifically for fault-tolerant, multi-rail power systems in automotive, industrial, and medical applications where independent sequencing, thermal monitoring, and transient robustness are mandatory.
FAQ
What is the maximum allowable input voltage for LT3692AIFE#TRPBF during transients?
The LT3692AIFE#TRPBF supports nonrepetitive 60V transients at VIN1/VIN2 for up to 1 second, per Absolute Maximum Ratings. Continuous operation is limited to 40V. This 60V transient rating enables direct connection to 24V automotive batteries with load-dump protection, eliminating need for upstream TVS clamping in many designs. Always verify layout decoupling and thermal margin under worst-case transient conditions for LT3692AIFE#TRPBF.
Can LT3692AIFE#TRPBF operate with only one channel enabled?
Yes-LT3692AIFE#TRPBF supports independent channel operation: SHDN1 controls both channels' bias and switching, while SHDN2 enables only Channel 2. To run Channel 1 alone, drive SHDN1 high and SHDN2 low. To run Channel 2 alone, SHDN1 must remain above 2.8V (to power internal regulators) and SHDN2 driven high. This flexibility enables partial-system power gating in LT3692AIFE#TRPBF-based designs.
How does the DIV pin affect switching frequency in LT3692AIFE#TRPBF?
The DIV pin sets Channel 1's frequency division ratio relative to the master clock (set by RT/SYNC): 0.5V → ÷2, 1.0V → ÷4, 1.5V → ÷8. An internal 12µA current source pulls DIV to GND through an external resistor. For example, 100kΩ yields ~1.2V → ÷4 mode. Channel 2 always runs at master frequency with 180° phase shift. This allows asymmetric optimization-e.g., 2.2MHz for low-noise 1.2V rail (Ch2) and 550kHz for high-current 3.3V rail (Ch1 ÷4) in LT3692AIFE#TRPBF.
What is the purpose of the TJ pin on LT3692AIFE#TRPBF, and how is it used?
The TJ pin on LT3692AIFE#TRPBF outputs a voltage proportional to die temperature: 250mV at 25°C with 10mV/°C slope. It enables real-time thermal monitoring without external sensors-critical for automotive derating and safety interlocks. Connect TJ to an ADC input; subtract 250mV and divide by 10 to obtain °C. The LT3692AIFE#TRPBF datasheet specifies TJ error ≤±100mV over –40°C to 125°C, supporting accurate margin analysis in mission-critical LT3692AIFE#TRPBF deployments.
Does LT3692AIFE#TRPBF support output voltage tracking, and how is it implemented?
Yes-LT3692AIFE#TRPBF supports precise output voltage tracking via shared soft-start (SS1/SS2 tied together) and feedback resistor networks. When SS pins are shorted, both channels ramp output voltages simultaneously. For ratio tracking (e.g., 3.3V and 1.65V), connect FB2 to a resistor divider from VOUT1. The LT3692AIFE#TRPBF's matched FB reference (≤±13mV offset) and independent current limits ensure tight tracking accuracy across line, load, and temperature-key for FPGA or processor core/memory rail sequencing.
LT3692AIFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 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:
- 38-TSSOP-EP
LT3692AIFE#TRPBF FAQ
1.How can I place an order for LT3692AIFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3692AIFE#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 LT3692AIFE#TRPBF reliable?
The price and inventory of LT3692AIFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3692AIFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3692AIFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3692AIFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3692AIFE#TRPBF?
LT3692AIFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3692AIFE#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 LT3692AIFE#TRPBF?
For technical support, including LT3692AIFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3692AIFE#TRPBF requirements.
6.How does Aetrix verify that LT3692AIFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3692AIFE#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 LT3692AIFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3692AIFE#TRPBF?
All LT3692AIFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3692AIFE#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 LT3692AIFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3692AIFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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