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Analog Devices Inc. LT8603JUJ#WTRPBF
- Part No.:
- LT8603JUJ#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT8603JUJ#WTRPBF.pdf
- Description:
- LT8603JUJ#WTRPBF
- Quantity:
- Payment:
- Shipping:
Inventory:3,317
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Product details
Overview
LT8603JUJ#WTRPBF from Analog Devices is a 42V, low-IQ, quad-output power management IC integrating two high-voltage synchronous buck regulators (up to 2.5A/1.5A), one low-voltage synchronous buck regulator (up to 1.8A), and a boost controller - all in a single 40-lead QFN (6mm × 6mm) package rated for –40°C to +150°C junction temperature. It enables cold-crank-tolerant automotive triple-output supplies and last-gasp CPU hold-up.
For engineers reviewing the LT8603JUJ#WTRPBF datasheet, LT8603JUJ#WTRPBF pinout, LT8603JUJ#WTRPBF application, or LT8603JUJ#WTRPBF equivalent, key selection considerations include its AEC-Q100 qualification, 28µA quiescent current in Burst Mode®, programmable power-on reset, individual channel power-good indicators, and ability to regulate four outputs with VBATT << VOUT via boost-assisted architecture.
Technical Context
The LT8603JUJ#WTRPBF implements three independent synchronous buck regulators (Channels 1–3) with cycle-by-cycle current limiting and thermal shutdown, plus a dedicated external-MOSFET boost controller (Channel 4) tolerant of –42V reverse-battery transients. Its architecture supports two distinct configurations: boost-as-VIN (enabling regulation during 2V cold-crank) or boost-as-SEPIC/standalone (delivering four regulated outputs).
Each buck channel features precision feedback references (FB1/FB2 = 1.0V ±1.5%, FB3 = 0.8V ±1.5%), programmable switching frequency (250kHz–2.2MHz), and track/soft-start inputs (TRKSS1–2, RUN3). The boost controller includes current-sense inputs (ISP4/ISN4), gate drive (GATE4), and internal 4.6V–5.0V INTVCC4 regulation - all validated across the full –40°C to +150°C operating range for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | Channels 1 & 2: 3.0V–42V; Channel 3: 2.6V–5.5V; Boost input: 2V–42V - enables operation during automotive cold crank (2V) and wide industrial input conditions. |
| Output Current Capability | Channel 1: 1.5A; Channel 2: 2.5A; Channel 3: 1.8A; Boost controller drives external MOSFETs - supports multi-rail SoC, MCU, and peripheral powering. |
| Quiescent Current | 28µA with high-voltage channels active in Burst Mode® - meets stringent automotive standby power requirements (ISO 16750-2). |
| Switching Frequency | 250kHz–2.2MHz (J-grade), set by RT resistor - allows EMI optimization and compact magnetics design without sacrificing efficiency at light loads. |
| Operating Temperature | –40°C to +150°C junction - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive and high-ambient industrial applications. |
| Power Good Indicators | Four open-drain PG1–PG4 outputs with 8% hysteresis - enables precise power sequencing and fault detection across all outputs. |
| Protection Features | Cycle-by-cycle current limit on all bucks; reverse-battery tolerance (–42V) on ISP4/ISN4; thermal shutdown; UVLO on EN/UVLO, PVIN3, and POREN - ensures robust operation in harsh environments. |
Pinout & Package
LT8603JUJ#WTRPBF is housed in a thermally enhanced 40-lead plastic QFN package (6mm × 6mm), with exposed thermal pad (Pin 41) requiring solder connection to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PG1, PG2, PG3 (Pins 1, 10, 40) | Open-drain power-good indicators | Assert low until respective FB voltage reaches 92% of reference; enable safe sequencing and system monitoring. |
| GND (Pins 2, 8, 13, 35, 38, 41) | System ground reference | All pins and exposed pad must be connected to low-impedance PCB ground plane to ensure stability, EMI control, and thermal performance. |
| SW1, SW2 (Pins 3, 6–7), SW3 (Pin 36) | Internal switch-node outputs | Drive external inductors; require tight layout with low-inductance paths to minimize switching losses and ringing. |
| BST1, BST2 (Pins 4–5) | Bootstrap supply for high-side FETs | Must connect ceramic capacitor (typically 0.1µF) from BSTx to corresponding SWx for gate drive integrity. |
| FSEL4A/FSEL4B (Pins 12, 17) | Boost controller enable & frequency select | Logic inputs controlling boost activation and switching frequency (0.25/1.0/2.0 MHz); both low disables boost entirely. |
| GATE4 (Pin 15) | External low-side MOSFET driver | Drives gate of external NMOS in boost/SEPIC topology; requires careful gate resistor selection to balance switching speed and EMI. |
| ISP4/ISN4 (Pins 19, 18) | Boost current-sense differential inputs | Monitor inductor current via external sense resistor; tolerate –42V common-mode transients - critical for reverse-battery protection. |
| TRKSS1/TRKSS2 (Pins 21, 20) | Track/soft-start control for Channels 1 & 2 | Capacitor-to-ground sets soft-start time; below 1V, regulates FB to TRKSS voltage instead of internal reference - enables output tracking. |
Key Features
| Feature | Design Value |
|---|---|
| Cold-crank resilient quad-output architecture | Boost controller sustains regulation of three buck outputs even when VBATT drops to 2V - eliminates brownouts during engine start in automotive systems. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C operation with full parametric testing - meets automotive reliability and lifetime requirements without derating. |
| Programmable power-on reset (POR) | CPOR capacitor sets POR delay (31–39ms typ.); RST provides active-low reset signal synchronized to all rail stabilization - ensures deterministic system boot. |
| Ultra-low quiescent current (28µA) | Enables >10-year battery life in always-on automotive modules (e.g., telematics, ADAS sensors) while maintaining full functionality of high-voltage rails. |
| Individual channel enable & sequencing | EN/UVLO, RUN3, and FSEL4A/B provide independent control over all four outputs - supports complex power-up/down sequences required by multi-core processors. |
Applications
| Automotive Infotainment Power Supply | ADAS Domain Controller Rail Generator |
|---|---|
Use Scenario: Powers SoC, DDR memory, display interface, and audio codec in head-unit systems with stop-start and cold-crank requirements. IC Role / Device Role / Timing Role: Quad-output PMIC delivering 5V/3.3V/1.2V/8V rails; boost controller maintains VIN > dropout during 2V cranking events. Use Value: Eliminates need for discrete boost stage and multiple controllers - reduces BOM count by ≥4 ICs and saves >120mm² PCB area. | Use Scenario: Supplies vision processor, radar SoC, and CAN transceivers in centralized ADAS ECUs operating under extended temperature and vibration. IC Role / Device Role / Timing Role: Primary power manager with AEC-Q100 Grade 1 rating; PG signals coordinate firmware initialization after all rails stabilize. Use Value: Guarantees <100ms total power-up time with deterministic sequencing - meets ASIL-B functional safety timing constraints. |
| Industrial PLC I/O Module Power | Medical Portable Diagnostic Device |
Use Scenario: Generates isolated sensor bias (±15V via external flyback), 5V logic, 3.3V MCU, and 1.8V FPGA core in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Flexible buck+boost architecture powers mixed-voltage subsystems from wide-input 9–36V DC supply. Use Value: Single-chip solution replaces 3 buck ICs + 1 boost controller - simplifies thermal design and improves MTBF by reducing interconnect failure points. | Use Scenario: Powers battery-backed clinical imaging subsystem (CMOS sensor, ADC, FPGA) requiring ultra-low standby drain and rapid wake-up. IC Role / Device Role / Timing Role: Low-IQ quad regulator with programmable POR and individual PG flags - enables reliable sleep/wake transitions. Use Value: 28µA IQ extends lithium primary battery life to >5 years in standby - exceeds IEC 62304 Class C longevity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892-2IUH#PBF | Dual-channel synchronous buck controller (no integrated FETs); no boost/SEPIC capability; supports up to 60V input. | Requires external high-side MOSFETs and separate boost circuit for cold-crank support - increases component count and layout complexity. | Select when higher input voltage (>42V) or discrete FET optimization is required; not drop-in for LT8603JUJ#WTRPBF's integrated quad architecture. |
| MAX20090ATGB/V+T | Triple-output buck regulator (no boost controller); integrates 3x monolithic bucks only; AEC-Q100 Grade 0 (–40°C to +125°C). | Lacks fourth regulated output and cold-crank boost capability - cannot replace LT8603JUJ#WTRPBF in 4-rail or sub-5V cranking scenarios. | Consider for cost-sensitive 3-rail automotive applications where boost functionality is handled externally or unnecessary. |
Compared with LTC3892-2IUH#PBF and MAX20090ATGB/V+T, the LT8603JUJ#WTRPBF uniquely integrates four regulated outputs - including a reverse-battery-tolerant boost controller - in a single AEC-Q100 Grade 1 package, enabling smaller footprint, lower system-level BOM cost, and guaranteed cold-crank operation without external components.
Availability
LT8603JUJ#WTRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS domain controllers, and industrial PLC I/O modules requiring stable component supply, AEC-Q100 compliance, and cold-crank resilience.
Supply support for LT8603JUJ#WTRPBF 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 LT8603 product line delivers highly integrated, AEC-Q100-qualified power management solutions targeting automotive and harsh-environment applications demanding cold-crank operation, ultra-low quiescent current, and multi-rail sequencing.
FAQ
What is the maximum junction temperature rating for the LT8603JUJ#WTRPBF?
The LT8603JUJ#WTRPBF is specified for continuous operation from –40°C to +150°C junction temperature and is fully guaranteed across this range per AEC-Q100 Grade 1 requirements. This rating enables deployment in under-hood automotive locations and high-ambient industrial enclosures without thermal derating.
How does the LT8603JUJ#WTRPBF support automotive cold-crank conditions?
The LT8603JUJ#WTRPBF supports cold-crank via its integrated boost controller (Channel 4), which can be configured to supply regulated voltage to the high-voltage buck inputs (PVIN1/PVIN2) when battery voltage drops as low as 2V. This maintains regulation of all three buck outputs - critical for uninterrupted operation during engine start.
Can the LT8603JUJ#WTRPBF generate four independent regulated outputs simultaneously?
Yes - the LT8603JUJ#WTRPBF can deliver four regulated outputs: three from its integrated synchronous bucks (Channels 1–3) and one from its external-MOSFET boost/SEPIC controller (Channel 4). When configured as SEPIC or standalone boost, all four outputs remain independently regulated across the full input range.
What is the purpose of the TRKSS1 and TRKSS2 pins on the LT8603JUJ#WTRPBF?
The TRKSS1 and TRKSS2 pins on the LT8603JUJ#WTRPBF provide track/soft-start control for Channels 1 and 2. Connecting a capacitor to ground sets soft-start time (~1ms typical), and pulling TRKSS below 1V causes the associated buck to regulate its FB pin to the TRKSS voltage - enabling precise output voltage tracking during power-up.
Does the LT8603JUJ#WTRPBF include reverse-battery protection?
Yes - the LT8603JUJ#WTRPBF's ISP4 and ISN4 current-sense inputs tolerate common-mode voltages down to –42V, and its boost controller remains functional during reverse-battery conditions. This eliminates the need for external reverse-polarity protection diodes or MOSFETs in automotive designs.
LT8603JUJ#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Number of Outputs:
- 4
- Output Phases:
- 4
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 42V
- Frequency - Switching:
- 250kHz ~ 2.2MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LT8603JUJ#WTRPBF FAQ
1.How can I place an order for LT8603JUJ#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8603JUJ#WTRPBF 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 LT8603JUJ#WTRPBF reliable?
The price and inventory of LT8603JUJ#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8603JUJ#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT8603JUJ#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8603JUJ#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8603JUJ#WTRPBF?
LT8603JUJ#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8603JUJ#WTRPBF 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 LT8603JUJ#WTRPBF?
For technical support, including LT8603JUJ#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8603JUJ#WTRPBF requirements.
6.How does Aetrix verify that LT8603JUJ#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT8603JUJ#WTRPBF 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 LT8603JUJ#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT8603JUJ#WTRPBF?
All LT8603JUJ#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8603JUJ#WTRPBF, 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 LT8603JUJ#WTRPBF part is unused and in its original packaging.
Return procedure for LT8603JUJ#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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