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Analog Devices Inc. LT8601JUJ#TRPBF
- Part No.:
- LT8601JUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT8601JUJ#TRPBF.pdf
- Description:
- IC REG BUCK ADJ TRPL 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,407
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Product details
Overview
LT8601JUJ#TRPBF from Analog Devices is a triple-channel monolithic synchronous step-down regulator with programmable power-on reset, supporting 3.0V–42V HV inputs (OUT1: 1.5A @ 5V; OUT2: 2.5A @ 3.3V) and 2.6V–5.5V LV input (OUT3: 1.8A @ 1.8V), operating up to 2.2MHz and delivering 93% peak efficiency in automotive power systems.
For engineers reviewing the LT8601JUJ#TRPBF datasheet, LT8601JUJ#TRPBF pinout, LT8601JUJ#TRPBF application, or LT8601JUJ#TRPBF equivalent, this page delivers verified thermal grade (–40°C to 150°C), AEC-Q100 qualification, 2-phase clocking for reduced input ripple, Burst Mode® quiescent current of 30µA, and confirmed 40-lead 6mm × 6mm QFN package with exposed GND pad.
Technical Context
The LT8601JUJ#TRPBF integrates three independent synchronous buck regulators: two high-voltage channels (PVIN1/PVIN2, 3.0V–42V, 1.5A/2.5A) and one low-voltage channel (PVIN3, 2.6V–5.5V, 1.8A), all synchronized to a single adjustable oscillator (250kHz–2.2MHz). Channel 1 uses CLK1; channels 2 and 3 share CLK2 (180° out-of-phase) to halve input ripple frequency and reduce required input capacitance.
Each channel employs current-mode control with cycle-by-cycle current limiting, programmable soft-start (1ms for OUT3), and dedicated power-good comparators (PG1–PG3) with ±8% thresholds. The J-grade variant guarantees full operation from –40°C to 150°C junction temperature and includes AEC-Q100 qualification for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (HV) | 3.0V to 42V - supports automotive transients up to 42V without external protection |
| Input Voltage Range (LV) | 2.6V to 5.5V - enables direct sourcing from HV outputs (e.g., 3.3V or 5V rails) |
| Output Currents | OUT1: 1.5A; OUT2: 2.5A; OUT3: 1.8A - sufficient for core logic, I/O, and memory rails in ADAS ECUs |
| Switching Frequency | 250kHz to 2.2MHz - RT-programmable; 2MHz operation enables <10µH inductors and compact 1210 ceramic caps |
| Quiescent Current | 30µA (all channels active, no load) - enables always-on subsystems with minimal battery drain |
| Efficiency (Peak) | 93% (HV), 95% (LV) - reduces thermal load in sealed enclosures and extends operating life at 150°C |
| Junction Temp Range | –40°C to 150°C - qualified per AEC-Q100 Grade 1; validated for under-hood automotive environments |
Pinout & Package
LT8601JUJ#TRPBF is housed in a thermally enhanced 40-lead 6mm × 6mm plastic QFN package with exposed GND pad (Pin 41), requiring soldering to PCB ground for θJC = 2°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PG1, PG2, PG3 | Open-drain Power Good indicators | Assert low until FBx reaches 92–108% of reference (1V for HV, 800mV for LV); enable sequencing validation |
| SW1, SW2, SW3 | Switch node outputs | Connect to external inductors; SW2 pins 6 & 7 must be shorted; layout critical for EMI control |
| PVIN1, PVIN2, PVIN3 | Independent input supplies | Enable flexible power tree design - e.g., PVIN1/PVIN2 from battery, PVIN3 from 5V rail |
| TRKSS1, TRKSS2 | Track/Soft-Start inputs | Program output ramp rate or track another supply; internal 2.4µA pull-up enables simple RC soft-start |
| CPOR, RST, POREN | Power-On Reset timing interface | CPOR capacitor sets POR delay (31–39.4ms typ); RST is open-drain CMOS output; POREN enables POR start |
Key Features
| Feature | Design Value |
|---|---|
| 2-Phase clock architecture | Reduces combined input ripple current by >50% vs. interleaved dual-phase, cutting required bulk capacitance by ~30% |
| Burst Mode® operation | Maintains <15mVpp output ripple at light load while achieving 30µA IQ - critical for always-on telematics modules |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood operation including HTOL, TC, and ESD testing - eliminates requalification effort |
| Independent UVLO on PVIN3 | 2.35V threshold prevents LV channel startup unless HV rail is stable - enforces safe power sequencing |
| Programmable switching frequency | RT resistor selection enables precise EMI band placement (e.g., avoid AM radio band) without changing magnetics |
Applications
| Automotive ADAS ECU | Industrial PLC I/O Module |
|---|---|
Use Scenario: Central domain controller powering camera ISP, radar processor, and CAN FD transceivers from 12V battery with transient tolerance to 42V. IC Role / Device Role / Timing Role: Triple-output PMIC providing isolated 5V (ISP core), 3.3V (interface), and 1.8V (memory) rails with synchronized switching to minimize conducted EMI. Use Value: 2-phase clocking cuts input ripple by 55%, enabling smaller 22µF X7R input caps instead of 47µF; AEC-Q100 qualification ensures reliability over 15-year vehicle lifecycle. | Use Scenario: DIN-rail mounted controller supplying field I/O (24V digital inputs), FPGA (1.2V), and communication PHY (3.3V) from wide-range 18–36V DC input. IC Role / Device Role / Timing Role: Primary DC-DC regulator delivering three regulated outputs with independent enable/control and thermal robustness for unventilated enclosures. Use Value: 150°C max junction rating allows continuous operation at 85°C ambient without derating; 30µA Burst Mode IQ extends backup battery runtime during brownouts. |
| Medical Imaging Sensor Hub | Avionics Display Power Supply |
Use Scenario: Compact sensor aggregation unit powering CMOS image sensors (2.8V), ADCs (3.3V), and microcontroller (1.8V) from 24V aircraft bus with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency triple buck regulator with CISPR25 Class 5 compliant radiated emissions when used with recommended EMI filter (DC2346A). Use Value: 2.2MHz operation shifts fundamental switching noise above 10MHz, simplifying filtering; 95% LV efficiency minimizes self-heating near sensitive analog front-ends. | Use Scenario: Next-gen cockpit display requiring fault-tolerant 5V, 3.3V, and 1.2V rails from 28V aircraft supply with cold-start capability down to 18V. IC Role / Device Role / Timing Role: Primary power management IC with programmable POR delay (via CPOR), independent RUN3 control, and power-good monitoring for system-level health reporting. Use Value: POREN/RST/PG signals integrate directly with avionics watchdog logic; 2.6V LV UVLO ensures clean startup only after HV rails stabilize. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8602JUJ#TRPBF | Same pinout, identical 40-lead QFN; adds spread-spectrum modulation and improved light-load efficiency (25µA IQ) | Required where CISPR25 Class 5 radiated emissions must be met without external filters | Select LT8602JUJ#TRPBF if EMI compliance is primary concern; otherwise LT8601JUJ#TRPBF offers cost advantage with same thermal rating |
| TPS6521905RHBR | Different package (32-pin VQFN), lower HV input (20V), no AEC-Q100 qualification, fixed 1.8V/3.3V/5V outputs | Suitable for industrial IoT gateways but not automotive due to temp range (–40°C to 125°C) and lack of transient robustness | Choose TPS6521905RHBR only for non-automotive, space-constrained designs needing fixed outputs and lower BOM count |
Compared with LT8602JUJ#TRPBF and TPS6521905RHBR, the LT8601JUJ#TRPBF uniquely combines AEC-Q100 Grade 1 qualification, 42V transient tolerance, fully programmable outputs, and 150°C operation - making it the sole option for high-reliability automotive power domains requiring extended temperature margin and design flexibility.
Availability
LT8601JUJ#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS ECUs, industrial PLC I/O modules, and medical imaging sensor hubs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8601JUJ#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The LT8601 product line delivers highly integrated, thermally robust multi-rail DC-DC regulators for automotive and industrial applications demanding wide input range, high efficiency, and AEC-Q100 reliability - specifically engineered for next-generation domain controllers and safety-critical power systems.
FAQ
What is the maximum allowable input voltage transient for LT8601JUJ#TRPBF?
The LT8601JUJ#TRPBF supports input transients up to 42V on PVIN1 and PVIN2 pins per Absolute Maximum Ratings. This is validated for automotive load-dump conditions. Sustained operation above 42V risks permanent damage. For reliable 12V automotive systems, the device tolerates ISO 7637-2 Pulse 5a (35V/200ms) and Pulse 5b (42V/100ms) without external clamping.
Does LT8601JUJ#TRPBF support independent enable control for each output channel?
No - LT8601JUJ#TRPBF does not provide individual EN pins per channel. Enable is controlled globally via EN/UVLO (Pin 22). However, channel-specific sequencing is achieved using TRKSS1/TRKSS2 (for OUT1/OUT2 tracking) and RUN3 (Pin 18, enables only OUT3), allowing staggered startup and fault-isolated shutdown.
What is the purpose of the exposed pad (Pin 41) on the LT8601JUJ#TRPBF QFN package?
The exposed pad (Pin 41) is electrically and thermally connected to GND. It must be soldered to a solid PCB ground plane to achieve θJC = 2°C/W and ensure safe operation at 150°C junction temperature. Omitting thermal vias or insufficient copper area will cause thermal shutdown or accelerated lifetime degradation.
Can LT8601JUJ#TRPBF operate in pulse-skipping mode, and how is it configured?
Yes - LT8601JUJ#TRPBF supports pulse-skipping mode. Tie SYNC (Pin 33) to INTVCC (Pin 28) to enable it. In this mode, the regulator skips switch cycles at light load to improve efficiency versus Burst Mode®, though with higher output ripple. Pulse-skipping is preferred when low-noise operation is less critical than efficiency.
How is the power-on reset timeout period set for LT8601JUJ#TRPBF?
The POR timeout is set by connecting a capacitor from CPOR (Pin 31) to GND. With a 1000pF capacitor, the typical delay is 35.2ms (range: 31–39.4ms). The internal 2µA pull-up current charges CPOR; RST (Pin 32) remains low until the capacitor voltage crosses the POR threshold, then goes high-Z (weak pull-up to ~2V).
LT8601JUJ#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 3
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.8V, 1V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 1.5A, 1.8A, 2.5A
- Frequency - Switching:
- 250kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LT8601JUJ#TRPBF FAQ
1.How can I place an order for LT8601JUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8601JUJ#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 LT8601JUJ#TRPBF reliable?
The price and inventory of LT8601JUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8601JUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8601JUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8601JUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8601JUJ#TRPBF?
LT8601JUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8601JUJ#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 LT8601JUJ#TRPBF?
For technical support, including LT8601JUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8601JUJ#TRPBF requirements.
6.How does Aetrix verify that LT8601JUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8601JUJ#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 LT8601JUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8601JUJ#TRPBF?
All LT8601JUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8601JUJ#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 LT8601JUJ#TRPBF part is unused and in its original packaging.
Return procedure for LT8601JUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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