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Analog Devices Inc. LT8601IUJ#TRPBF
- Part No.:
- LT8601IUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT8601IUJ#TRPBF.pdf
- Description:
- IC REG BUCK ADJ TRPL 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:341
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Product details
Overview
LT8601IUJ#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 with 30µA quiescent current in Burst Mode - deployed in automotive distributed power systems requiring tight regulation across wide input transients.
For engineers reviewing the LT8601IUJ#TRPBF datasheet, LT8601IUJ#TRPBF pinout, LT8601IUJ#TRPBF application, or LT8601IUJ#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 2-phase clock architecture reducing input ripple, independent PVIN rails for sequencing, and integrated power-good indicators with ±8% output voltage monitoring tolerance.
Technical Context
The LT8601IUJ#TRPBF integrates two high-voltage synchronous buck regulators (PVIN1/PVIN2, 3.0V–42V) and one low-voltage synchronous buck regulator (PVIN3, 2.6V–5.5V), each with cycle-by-cycle current limiting and independent feedback references (1.0V for HV channels, 0.8V for LV channel). All three channels share a single adjustable oscillator (250kHz–2.2MHz) and operate in 2-phase timing: Channel 1 on CLK1, Channels 2 & 3 on CLK2 (180° out-of-phase).
It supports programmable power-on reset via CPOR capacitor (31–39.4ms delay), logic-controlled enable/UVLO (1.2V threshold), and flexible light-load operation - selectable between low-ripple Burst Mode (30µA IQ) and pulse-skipping via SYNC pin. Thermal shutdown and reverse-current protection are built-in.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (HV) | 3.0V to 42V - supports automotive battery transients up to 42V without external clamping |
| 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 subsystems |
| Switching Frequency | 250kHz to 2.2MHz - adjustable via RT resistor; enables trade-off between efficiency and component size |
| Quiescent Current | 30µA (all channels active, no load) - critical for always-on automotive modules |
| Efficiency | Up to 93% (HV), 95% (LV) - achieved via synchronous rectification and optimized RDS(ON) (150mΩ top / 100mΩ bottom for CH2) |
| Power-On Reset Delay | 31–39.4ms (with 1nF CPOR) - ensures stable supply before system initialization |
| Operating Temperature | –40°C to +125°C junction - qualified per AEC-Q100 Grade I for under-hood applications |
Pinout & Package
LT8601IUJ#TRPBF is housed in a thermally enhanced 40-lead 6mm × 6mm QFN package with exposed thermal pad (Pin 41 = GND). The package supports high-power density designs with θJA = 33°C/W and θJC = 2°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (23) | Internal circuit supply | Must be ≥3V to enable operation; independent of PVIN pins for robust biasing |
| PVIN1 (37), PVIN2 (14), PVIN3 (17) | Channel-specific input supplies | Enable independent sourcing: e.g., PVIN1/PVIN2 from battery, PVIN3 from regulated 3.3V rail |
| SW1 (3), SW2 (6,7), SW3 (15) | Switch node outputs | SW2 pins must be shorted externally; all drive external inductors for buck conversion |
| FB1 (26), FB2 (25), FB3 (24) | Feedback inputs | Regulate to 1.0V (CH1/CH2) or 0.8V (CH3); require precision resistor dividers for output setting |
| PG1 (1), PG2 (11), PG3 (12) | Open-drain power-good indicators | Assert low when corresponding output deviates >±8% from target - used for system sequencing and fault detection |
| RT (29) | Oscillator frequency programming | Resistor to GND sets switching frequency (e.g., 28.7kΩ → 2MHz); enables EMI optimization |
| SYNC (33) | Mode control & synchronization | GND = Burst Mode; INTVCC = pulse-skip; external clock = synchronized operation |
| CPOR (31), RST (32), POREN (39) | Power-on reset timing | CPOR capacitor programs delay; RST is open-drain reset signal; POREN enables POR initiation |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent buck regulation | Enables compact 3-rail power solution (e.g., 5V/3.3V/1.8V) without discrete controllers or external sequencing ICs |
| 2-phase interleaved clocking | Reduces total input ripple current by ~50% and halves required input capacitance vs. single-phase operation |
| AEC-Q100 Grade I qualification | Validated for automotive use at –40°C to +125°C junction temperature with full reliability testing |
| Low-ripple Burst Mode | Maintains <15mV output ripple while achieving 30µA quiescent current - essential for battery-backed modules |
| Programmable power-on reset | Configurable POR delay (31–39.4ms typical) via single external capacitor - eliminates need for external reset IC |
| Independent enable & UVLO per channel | EN/UVLO (Pin 22) controls global enable; RUN3 (Pin 18) and TRKSSx (Pins 20,21) allow precise power sequencing |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering SoC core (1.8V), DDR interface (3.3V), and USB PHY (5V) from 12V battery with transient immunity up to 42V. IC Role / Device Role / Timing Role: Triple-output buck controller providing tightly regulated, sequenced rails with integrated POR and PG monitoring. Use Value: Eliminates need for three separate regulators and external reset IC, reducing BOM count by ≥5 components and PCB area by >30%. |
Use Scenario: Generating 5V (logic), 3.3V (communication), and 1.8V (sensor interface) from 24V industrial bus with brownout resilience. IC Role / Device Role / Timing Role: High-reliability DC/DC controller with independent PVIN inputs enabling redundant sourcing and fault isolation. Use Value: Withstands 24V bus dips to 3V while maintaining regulation - validated over –40°C to +125°C with no derating. |
| Distributed Automotive ADAS Camera System | Medical Portable Diagnostic Device |
|
Use Scenario: Powering image sensor (1.8V), ISP (3.3V), and interface ASIC (5V) in compact rear-view camera module exposed to engine bay temperatures. IC Role / Device Role / Timing Role: AEC-Q100 qualified triple buck with thermal shutdown and reverse-current protection for safety-critical operation. Use Value: 95% LV channel efficiency at 1.8V/1.8A reduces thermal load in sealed enclosure - no heatsink required. |
Use Scenario: Battery-powered handheld ultrasound device requiring ultra-low standby current and clean analog supplies. IC Role / Device Role / Timing Role: Low-IQ triple regulator enabling >72-hour battery life in sleep mode with fast wake-up via EN/UVLO. Use Value: 30µA quiescent current extends battery runtime; <15mV output ripple prevents noise coupling into sensitive analog front-end. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8602IUJ#TRPBF | Higher HV output currents (2.5A/3.5A), same package and pinout; adds spread-spectrum modulation | Better suited for higher-power ADAS ECUs where CH2 load exceeds 2.5A | Select LT8602IUJ#TRPBF if CH2 current demand >2.5A or CISPR-25 Class 5 EMI compliance is mandatory |
| TPS6521905RGER | Lower input voltage range (2.7V–5.5V only), fixed 3.3V/1.8V/1.2V outputs, no programmable frequency or POR | Targeted at cost-sensitive consumer portable devices, not automotive or wide-input applications | Choose TPS6521905RGER only for non-automotive, low-voltage, fixed-output systems where flexibility is secondary to BOM cost |
Compared with LT8602IUJ#TRPBF, the LT8601IUJ#TRPBF offers lower cost and identical footprint for ≤2.5A CH2 loads, while the TPS6521905RGER lacks HV capability, programmability, and automotive qualification - making LT8601IUJ#TRPBF the optimal balance of integration, ruggedness, and design flexibility for demanding embedded power systems.
Availability
LT8601IUJ#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and distributed ADAS camera systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8601IUJ#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.
The LT8601IUJ#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency monolithic DC/DC regulators, designed specifically for space-constrained, high-reliability applications requiring wide input ranges, low EMI, and automotive-grade robustness.
FAQ
What is the maximum input voltage rating for LT8601IUJ#TRPBF's high-voltage channels?
The LT8601IUJ#TRPBF's PVIN1 and PVIN2 pins support an absolute maximum input voltage of 42V, with continuous operation specified from 3.0V to 42V. This rating enables direct connection to automotive 12V and 24V battery systems including load-dump transients, as confirmed in the Absolute Maximum Ratings table (Page 2) and Typical Application schematic (Page 1).
Does LT8601IUJ#TRPBF support independent power sequencing between its three output channels?
Yes, the LT8601IUJ#TRPBF supports independent sequencing via TRKSS1/TRKSS2 (for CH1/CH2 tracking) and RUN3 (for CH3 enable), allowing controlled ramp-up order. The datasheet confirms this in the PIN FUNCTIONS section (Page 10) and OPERATION chapter (Page 12), where TRKSS pins regulate FB to track voltage instead of internal reference, and RUN3 has a 0.72V threshold for precise CH3 activation timing.
What is the guaranteed operating junction temperature range for LT8601IUJ#TRPBF?
The LT8601IUJ#TRPBF is rated for –40°C to +125°C junction temperature and is qualified per AEC-Q100 Grade I. This is explicitly stated in the ORDER INFORMATION table (Page 3) and confirmed in Note 2 of the Electrical Characteristics (Page 4), which specifies full performance guarantee across that range.
Can LT8601IUJ#TRPBF synchronize its switching frequency to an external clock source?
Yes, the LT8601IUJ#TRPBF supports external clock synchronization via the SYNC pin (Pin 33). When a digital clock signal within 0.25MHz–2.2MHz is applied, the device locks its internal oscillator and operates in pulse-skipping mode - detailed in the PIN FUNCTIONS section (Page 10) and OPERATION chapter (Page 12).
How is the power-on reset timeout period configured for LT8601IUJ#TRPBF?
The LT8601IUJ#TRPBF's POR timeout is set using an external capacitor on CPOR (Pin 31). With a 1nF capacitor, the delay is 31–39.4ms (typical 35.2ms), as specified in the Electrical Characteristics table (Page 4). The CPOR pin has a 2µA pull-up current, and POR initiates when POREN (Pin 39) exceeds 1.2V - all confirmed in the APPLICATIONS INFORMATION section (Page 13).
LT8601IUJ#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)
LT8601IUJ#TRPBF FAQ
1.How can I place an order for LT8601IUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8601IUJ#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 LT8601IUJ#TRPBF reliable?
The price and inventory of LT8601IUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8601IUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8601IUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8601IUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8601IUJ#TRPBF?
LT8601IUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8601IUJ#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 LT8601IUJ#TRPBF?
For technical support, including LT8601IUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8601IUJ#TRPBF requirements.
6.How does Aetrix verify that LT8601IUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8601IUJ#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 LT8601IUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8601IUJ#TRPBF?
All LT8601IUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8601IUJ#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 LT8601IUJ#TRPBF part is unused and in its original packaging.
Return procedure for LT8601IUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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