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Analog Devices Inc. LT8603IUJ#TRPBF
- Part No.:
- LT8603IUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT8603IUJ#TRPBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,463
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Product details
Overview
LT8603IUJ#TRPBF from Analog Devices is a quad-output automotive-grade power management IC integrating two 42V synchronous buck regulators (Ch1/Ch2), one 5.5V low-input buck regulator (Ch3), and a boost controller (Ch4). It delivers regulated outputs of 5V/1.5A, 3.3V/2.5A, 1.2V/1.8A, and 8V (boost) with cold-crank tolerance down to 2V input, supporting automotive stop-start and last-gasp CPU hold-up.
For engineers reviewing the LT8603IUJ#TRPBF datasheet, LT8603IUJ#TRPBF pinout, LT8603IUJ#TRPBF application, or LT8603IUJ#TRPBF equivalent, key selection considerations include AEC-Q100 qualification, 28µA quiescent current in Burst Mode®, independent channel power-good indicators (PG1–PG4), programmable power-on reset (CPOR), and 40-lead 6mm × 6mm QFN package with exposed thermal pad.
Technical Context
The LT8603IUJ#TRPBF implements four independent regulation loops: Ch1/Ch2 use cycle-by-cycle current limiting with 240mΩ/150mΩ top-FET RDS(ON) and 170mΩ/100mΩ bottom-FET RDS(ON); Ch3 employs PMOS/NMOS switching with 150mΩ/100mΩ RDS(ON); Ch4 uses external MOSFETs controlled via GATE4 with 2.5Ω high-side and 1.25Ω low-side gate drive impedance. All channels support soft-start via TRKSS1/TRKSS2/RUN3/CPOR.
Its architecture enables flexible system-level configurations: boost output can supply VIN to Ch1/Ch2 during cold crank (VBATT < VOUT), or Ch4 can operate as SEPIC for fourth regulated output; EN/UVLO (1.2V threshold), SYNC (0.25–2.2MHz), and FSEL4A/FSEL4B provide precise sequencing, frequency control, and boost enable/disable logic without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | Ch1/Ch2: 3.0V–42V; Ch3: 2.6V–5.5V; Ch4 sense: 2V–42V - supports automotive battery transients including cold crank (2V) and load dump. |
| Output Current Capability | Ch1: 1.5A; Ch2: 2.5A; Ch3: 1.8A; Ch4: external MOSFET-dependent - enables multi-rail SoC/CPU/peri power with independent current limits. |
| Quiescent Current | 28µA (all channels active, no load) - meets automotive always-on requirements with minimal battery drain. |
| Switching Frequency | 250kHz–2.2MHz (RT-programmable) - allows optimization of size vs. efficiency and EMI compliance (CISPR 25 Class 5 verified). |
| Operating Temperature | –40°C to +125°C junction - qualified per AEC-Q100 Grade I for under-hood automotive applications. |
| Feedback Accuracy | ±1.5% over temp (Ch1/Ch2 FB = 1.0V; Ch3/Ch4 FB = 0.8V) - ensures stable voltage regulation across wide thermal and line/load conditions. |
| Power-Good Threshold | ±8% hysteresis (e.g., PG1 asserts at 92–110% of VFB1) - provides robust rail monitoring for system sequencing and fault detection. |
Pinout & Package
LT8603IUJ#TRPBF is housed in a thermally enhanced 40-lead 6mm × 6mm plastic QFN package (UJ) with exposed 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 target; enable safe system power sequencing. |
| GATE4 (Pin 15) | Boost controller gate driver output | Drives external low-side MOSFET; 2.5Ω high-side / 1.25Ω low-side impedance enables fast, efficient switching. |
| ISP4, ISN4 (Pins 19, 18) | Boost current-sense differential inputs | Measure external sense resistor voltage drop; support ±42V common-mode range for reverse-battery tolerance. |
| FSEL4A, FSEL4B (Pins 12, 17) | Boost frequency select & enable logic | Digital inputs selecting boost operating mode (shutdown, 1MHz, 2MHz) - no external resistors needed. |
| TRKSS1, TRKSS2 (Pins 21, 20) | Track/soft-start control for Ch1/Ch2 | Capacitor-to-ground sets soft-start time (~1ms typical); enables voltage tracking during power-up. |
| CPOR (Pin 31) | Power-on reset timing capacitor | 1000pF sets POR delay to 35.2ms - ensures clean system initialization before releasing RST signal. |
Key Features
| Feature | Design Value |
|---|---|
| Cold-crank tolerant operation | Maintains regulation on all three buck outputs (5V/3.3V/1.2V) even when input drops to 2V - critical for automotive start-stop systems. |
| Independent channel enable & sequencing | EN/UVLO, RUN3, FSEL4A/B, TRKSS1/2 allow precise turn-on order and voltage ramp control without external timers. |
| Burst Mode® with 28µA IQ | Enables ultra-low standby power while maintaining regulation - extends battery life in always-on vehicle modules. |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation with full parametric testing - meets automotive reliability and lifetime requirements. |
| Reverse-battery and negative transient protection | ISP4/ISN4 tolerate –42V input - eliminates need for external protection diodes in harsh automotive environments. |
| Integrated power-on reset (POR) | RST output held low for 35.2ms (with 1000pF CPOR) - ensures microcontroller resets cleanly before power rails stabilize. |
Applications
| Automotive Infotainment Power Supply | ADAS Domain Controller Rail Generation |
|---|---|
Use Scenario: Powering SoC, DDR memory, display interface, and audio codecs in head-unit systems with cold-crank immunity. IC Role / Device Role / Timing Role: Quad-output PMIC providing sequenced 5V (SoC core), 3.3V (I/O), 1.2V (DDR), and 8V (LCD bias) from 12V battery. Use Value: Eliminates need for discrete LDOs and external sequencing ICs; 28µA IQ extends parking-mode battery life. |
Use Scenario: Supplying radar processor, camera ISP, and CAN transceivers in autonomous driving ECUs subject to load dump and reverse-battery events. IC Role / Device Role / Timing Role: Primary power manager delivering 3.3V/2.5A (processor I/O), 1.2V/1.8A (core), and 5V/1.5A (peripherals) with integrated reverse-polarity protection. Use Value: ISP4/ISN4 ±42V tolerance removes external TVS diodes; AEC-Q100 Grade I ensures functional safety compliance. |
| Industrial PLC I/O Module | Telematics Control Unit (TCU) |
Use Scenario: Generating isolated sensor bias, microcontroller VDD, and communication interface rails in factory automation controllers. IC Role / Device Role / Timing Role: Flexible buck-boost architecture supplies 5V (MCU), 3.3V (RS-485 transceiver), and 1.2V (ADC reference) from wide-input 9–36V DC bus. Use Value: RT-programmable 250kHz–2.2MHz switching enables EMI filtering optimization for noisy industrial environments. |
Use Scenario: Powering LTE modem, GNSS receiver, and eSIM subsystems in connected vehicle gateways with extended battery hold-up. IC Role / Device Role / Timing Role: Boost controller (Ch4) maintains 5V rail during engine-off battery sag; Ch1/Ch2/Ch3 supply modem cores and peripherals. Use Value: "Last-gasp" capability sustains network registration for >100ms after ignition loss - enables emergency call handover. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output automotive power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8602IUJ#TRPBF | Triple-output (no boost controller); lacks Ch4, PG4, ISP4/ISN4, GATE4 - smaller footprint but no cold-crank boost capability. | Suitable only where four independent rails are not required; cannot sustain VOUT > VBATT during cold crank. | Select when system uses external boost or operates above 6V minimum input; saves board space and BOM cost. |
| MPQ4436-AEC1 | Triple 42V buck (no boost); 3.5A/2.5A/1.5A outputs; no PG indicators, no CPOR/RST, no TRKSS - simpler feature set. | Lacks power sequencing, POR, and cold-crank boost - requires external circuitry for automotive robustness. | Choose for cost-sensitive applications with less stringent sequencing or cold-crank requirements. |
Compared with LT8602IUJ#TRPBF and MPQ4436-AEC1, the LT8603IUJ#TRPBF uniquely integrates a dedicated boost controller with reverse-battery tolerance and four independent power-good signals - enabling single-chip cold-crank survival and full-system sequencing without external components.
Availability
LT8603IUJ#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS domain controllers, industrial PLCs, telematics control units, and battery-powered embedded systems requiring stable component supply across temperature, voltage, and lifecycle variations.
Supply support for LT8603IUJ#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 LT8603IUJ#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency, high-reliability DC/DC regulators designed specifically for demanding automotive and industrial power systems.
FAQ
What is the maximum input voltage rating for LT8603IUJ#TRPBF's high-voltage buck channels?
The LT8603IUJ#TRPBF's PVIN1 and PVIN2 pins support an absolute maximum input voltage of 42V, with recommended operating range from 3.0V to 42V. This enables direct connection to automotive battery rails and tolerance of load-dump transients up to ISO 7637-2 Pulse 5a. The device also withstands reverse-battery conditions down to –42V on ISP4/ISN4, protecting the boost controller during installation errors.
How does LT8603IUJ#TRPBF achieve cold-crank operation below 3V input?
The LT8603IUJ#TRPBF achieves cold-crank operation by using its integrated boost controller (Channel 4) to generate a stable intermediate rail (e.g., 8V) that powers PVIN1 and PVIN2 when battery voltage drops to 2V. This ensures the high-voltage buck regulators remain functional and continue delivering 5V and 3.3V outputs even during engine cranking, as confirmed in the "Response to a Cold Crank" waveform (Fig TA01b).
Can LT8603IUJ#TRPBF be configured for four independent regulated outputs?
Yes - the LT8603IUJ#TRPBF supports four regulated outputs by configuring Channel 4 as a SEPIC converter or by powering it from one of the buck outputs (e.g., Ch1 5V → Ch4 boost → 12V). In this mode, Ch1, Ch2, Ch3, and Ch4 each deliver independently regulated voltages across their specified input ranges, validated in the "Flexible Power Supply System" application note.
What is the purpose of the TRKSS1 and TRKSS2 pins on LT8603IUJ#TRPBF?
The TRKSS1 and TRKSS2 pins on LT8603IUJ#TRPBF provide track/soft-start functionality for Channels 1 and 2. When pulled below 1V, they override the internal 1.0V feedback reference and force regulation to the TRKSS voltage instead. Connecting a capacitor from TRKSSx to ground programs a ~1ms soft-start ramp, enabling controlled voltage ramping and sequencing between rails.
Does LT8603IUJ#TRPBF include built-in power-on reset functionality?
Yes - the LT8603IUJ#TRPBF integrates a programmable power-on reset (POR) circuit. A capacitor (e.g., 1000pF) connected from CPOR (Pin 31) to ground sets the POR delay to 35.2ms (typical). Upon timeout, the open-drain RST (Pin 32) pin releases, signaling that all regulated outputs have stabilized - eliminating need for external reset ICs in automotive and industrial designs.
LT8603IUJ#TRPBF 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:
- 2
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LT8603IUJ#TRPBF FAQ
1.How can I place an order for LT8603IUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8603IUJ#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 LT8603IUJ#TRPBF reliable?
The price and inventory of LT8603IUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8603IUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8603IUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8603IUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8603IUJ#TRPBF?
LT8603IUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8603IUJ#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 LT8603IUJ#TRPBF?
For technical support, including LT8603IUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8603IUJ#TRPBF requirements.
6.How does Aetrix verify that LT8603IUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8603IUJ#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 LT8603IUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8603IUJ#TRPBF?
All LT8603IUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8603IUJ#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 LT8603IUJ#TRPBF part is unused and in its original packaging.
Return procedure for LT8603IUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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