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Analog Devices Inc. LT8602IUJ#TRPBF
- Part No.:
- LT8602IUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT8602IUJ#TRPBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:316
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Product details
Overview
LT8602IUJ#TRPBF from Analog Devices is a quad-channel monolithic synchronous step-down regulator with two 3V–42V high-voltage channels (1.5A OUT1, 2.5A OUT2) and two 2.6V–5.5V low-voltage channels (1.8A OUT3/OUT4), programmable 250kHz–2.2MHz switching frequency, 30µA quiescent current in Burst Mode, and integrated power-on reset with adjustable delay via CPOR capacitor.
For engineers reviewing the LT8602IUJ#TRPBF datasheet, LT8602IUJ#TRPBF pinout, LT8602IUJ#TRPBF application, or LT8602IUJ#TRPBF equivalent, key selection considerations include input voltage range partitioning (HV vs LV rails), per-channel RUN/PG signaling, 2-phase clock architecture for reduced input ripple, thermal performance in 6mm × 6mm QFN, and compatibility with BIAS-supplied INTVCC for light-load efficiency optimization.
Technical Context
The LT8602IUJ#TRPBF implements a constant-frequency current-mode control architecture with four independent buck regulators sharing a single oscillator. Channels 1 & 3 operate on CLK1; channels 2 & 4 on CLK2 (180° out of phase), enabling multiphase operation to halve input ripple frequency and reduce peak input current.
Each channel features cycle-by-cycle current limiting, dedicated FB reference (1.0V for HV channels, 0.8V for LV channels), open-drain PG outputs with ±8% trip thresholds, and independent enable/control pins (EN/UVLO, RUN3/4, TRKSS1/2). The internal INTVCC regulator is powered either from VIN or an external BIAS supply ≥3.1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (HV) | 3V to 42V on PVIN1/PVIN2 - supports automotive battery, industrial 24V, and wide-range DC inputs without external pre-regulation. |
| Input Voltage Range (LV) | 2.6V to 5.5V on PVIN3/PVIN4 - enables direct powering from HV channel outputs (e.g., 3.3V or 5V rails). |
| Output Current (Ch1/Ch2) | 1.5A / 2.5A - sufficient for FPGA I/O banks, microcontroller cores, and peripheral supplies in compact systems. |
| Output Current (Ch3/Ch4) | 1.8A each - supports DDR memory termination, analog sensor bias, and low-voltage logic rails. |
| Quiescent Current | 30µA with all channels active - enables always-on subsystems in battery-backed or energy-sensitive applications. |
| Switching Frequency | 250kHz to 2.2MHz (RT-programmable) - allows trade-off between inductor size (high-f) and efficiency/noise (low-f). |
| Power-On Reset Delay | 31–39.4ms (with 1nF CPOR) - provides deterministic system-level power sequencing timing for downstream logic. |
Pinout & Package
The LT8602IUJ#TRPBF is housed in a thermally enhanced 40-lead 6mm × 6mm plastic QFN package (UJ) with exposed pad (Pin 41) soldered to PCB ground for optimal thermal performance (θJC = 2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 2,8,9,13,16,35,38,41) | Ground Reference | Multiple dedicated GND pins and exposed thermal pad ensure low-impedance return paths and stable regulation under dynamic load. |
| PVIN1, PVIN2 | HV Input Supplies | Independent 3V–42V inputs for Ch1/Ch2 - allow dual-source operation or isolation between high-noise and sensitive rails. |
| PVIN3, PVIN4 | LV Input Supplies | 2.6V–5.5V inputs for Ch3/Ch4 - typically connected to regulated outputs of Ch1/Ch2 for cascaded power trees. |
| SW1–SW4 | Switch Nodes | Internal MOSFET outputs - require careful layout with short, low-inductance paths to external inductors and capacitors. |
| FB1–FB4 | Feedback Inputs | Regulate to 1.0V (Ch1/Ch2) or 0.8V (Ch3/Ch4) - set output voltage via resistor dividers; FB nodes must be routed away from noisy SW traces. |
| PG1–PG4 | Power Good Indicators | Open-drain outputs pulled low when VOUT deviates >8% - used for system monitoring, sequencing, or fault flagging. |
| RUN3, RUN4 | LV Channel Enables | Logic inputs controlling startup of Ch3/Ch4 - enable precise power-up ordering relative to HV rails. |
| TRKSS1, TRKSS2 | Track/Soft-Start Inputs | Allow voltage tracking or controlled soft-start for Ch1/Ch2 - internal 2.4µA pull-up enables simple RC ramp generation. |
Key Features
| Feature | Design Value |
|---|---|
| 2-Phase Clock Architecture | Channels 1+3 and 2+4 operate 180° out-of-phase - reduces total input ripple current by up to 50% and cuts required input capacitance. |
| Burst Mode® Operation | 30µA IQ with all four channels active - maintains regulation at light loads while minimizing standby power loss in always-on systems. |
| Programmable Power-On Reset | Adjustable POR delay (31–39.4ms typical) via external CPOR capacitor - ensures reliable, repeatable system initialization timing. |
| Dual-Supply Domain Support | Separate HV (3–42V) and LV (2.6–5.5V) input pins - enables flexible power tree design with local regulation and noise isolation between domains. |
| Per-Channel RUN and PG Signals | Independent RUN3/4 enables and PG1–PG4 status outputs - supports complex power sequencing and real-time rail health monitoring. |
Applications
| Automotive Infotainment System | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering SoC core, GPU, DDR memory, and display interface in head-unit with 12V/24V battery input and EMI constraints. IC Role / Device Role / Timing Role: Quad-output PMIC providing 5V (SoC I/O), 3.3V (GPU), 1.8V (DDR), and 1.2V (core) with synchronized 2MHz switching and low-ripple Burst Mode during sleep. Use Value: Single-chip solution eliminates discrete regulators, reduces board area by >40%, and meets CISPR25 Class 5 radiated emission limits via 2-phase operation. | Use Scenario: Supplying isolated analog front-end, digital logic, communication interfaces (RS-485, CAN), and field-side sensors in modular PLC base. IC Role / Device Role / Timing Role: Central power manager delivering 5V (microcontroller), 3.3V (FPGA config), 1.8V (ADC reference), and 1.2V (sensor bias) with independent RUN/PG for diagnostics. Use Value: Per-rail power good signals enable real-time fault detection; HV/LV domain separation prevents noise coupling into precision analog sections. |
| Medical Point-of-Care Monitor | Test & Measurement Equipment |
Use Scenario: Battery-powered portable monitor requiring ultra-low standby current, clean analog supplies, and fast wake-up from deep sleep. IC Role / Device Role / Timing Role: Primary power IC operating in Burst Mode at 30µA IQ, generating 3.3V (MCU), 1.8V (touch controller), 1.2V (RF transceiver), and 5V (USB charging port). Use Value: Extended battery life (>72h standby); low-noise LV outputs minimize ADC/DAC quantization error; programmable POR ensures deterministic boot after brownout. | Use Scenario: Benchtop instrument needing multiple precision rails (±15V derived externally, 5V/3.3V/1.8V/1.2V internally) with tight regulation and sequencing. IC Role / Device Role / Timing Role: Embedded quad-buck regulator supplying FPGA, ADC/DAC, clock buffers, and interface logic with TRKSS-controlled soft-start and PG-monitored validation. Use Value: Eliminates need for external sequencers; 0.8V/1.0V FB references enable <±1% output accuracy; 2-phase clock suppresses input ripple affecting sensitive analog measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4485GQ-AEC1-Z | Automotive-grade quad buck (3.5V–36V), 2A/2A/1.5A/1.5A, fixed 2.2MHz, no programmable POR or TRKSS. | Lacks power-on reset adjustability and track/soft-start inputs - unsuitable where precise sequencing or POR delay tuning is required. | Select when AEC-Q100 qualification is mandatory and simplified control (no CPOR/TRKSS) is acceptable. |
| TPS6521905RGER | Quad buck (2.7V–5.5V only), 3A/3A/2A/2A, 500kHz–2.2MHz, integrated LDOs, no HV capability. | Cannot accept 12V/24V/42V inputs directly - requires upstream HV pre-regulator, increasing BOM count and losses. | Select for pure low-voltage multi-rail systems where integrated LDOs and higher current per channel outweigh HV input omission. |
Compared with MPQ4485GQ-AEC1-Z and TPS6521905RGER, the LT8602IUJ#TRPBF uniquely combines 42V HV input support, true quad-domain independence (HV + LV), programmable POR, and 2-phase ripple reduction - making it the only option for compact, high-efficiency, wide-input industrial and automotive power trees requiring deterministic sequencing and low-IQ standby.
Availability
LT8602IUJ#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC modules, and medical point-of-care monitors requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LT8602IUJ#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 industrial, automotive, communications, and healthcare markets.
The LT8602IUJ#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency monolithic DC/DC regulators, designed specifically for space-constrained, wide-input industrial and automotive systems requiring multiple precisely sequenced, low-noise power rails.
FAQ
What is the maximum input voltage rating for the HV channels of the LT8602IUJ#TRPBF?
The LT8602IUJ#TRPBF HV channels (Ch1 and Ch2) have an absolute maximum input voltage rating of 42V on PVIN1 and PVIN2. The recommended operating range is 3V to 42V. Exceeding 42V may cause permanent damage, as specified in the Absolute Maximum Ratings table. This rating enables direct connection to 24V industrial buses and 12V/24V/36V automotive batteries with margin for transients.
How does the 2-phase clock architecture in the LT8602IUJ#TRPBF reduce input ripple current?
The LT8602IUJ#TRPBF uses two 180° out-of-phase clock signals: CLK1 drives Ch1 and Ch3, CLK2 drives Ch2 and Ch4. Because buck regulators draw input current only during the top-FET on-time, interleaving halves the effective input ripple frequency and reduces peak-to-peak amplitude by up to 50%. This allows smaller input capacitors and lowers EMI emissions - confirmed by CISPR25 Class 5 test data on the DC1949A demo board.
Can the LT8602IUJ#TRPBF generate 1.2V and 1.8V outputs simultaneously with independent sequencing?
Yes. The LT8602IUJ#TRPBF supports simultaneous 1.2V (Ch4) and 1.8V (Ch3) outputs using its LV channels, each with dedicated RUN3 and RUN4 enable inputs. These pins allow independent assertion timing - for example, asserting RUN3 before RUN4 ensures 1.8V ramps first, satisfying sequencing requirements for DDR memory or FPGA configuration. Soft-start time is fixed at 0.7–1.3ms per channel.
What is the function of the BIAS pin on the LT8602IUJ#TRPBF, and how does it affect efficiency?
The BIAS pin on the LT8602IUJ#TRPBF powers the internal INTVCC regulator. When connected to a clean ≥3.1V supply (e.g., from Ch1's 5V output), BIAS reduces VIN quiescent current and improves light-load efficiency. Leaving BIAS unconnected forces INTVCC to be sourced from VIN, increasing IQ by ~40µA at light loads. The datasheet specifies BIAS must be decoupled with a low-ESR 4.7µF capacitor.
Does the LT8602IUJ#TRPBF support synchronization to an external clock, and what are the voltage requirements?
Yes. The LT8602IUJ#TRPBF supports external clock synchronization via the SYNC pin, which accepts TTL/CMOS-compatible inputs from 0.25MHz to 2.2MHz. SYNC low (≤0.3V) enables low-ripple Burst Mode; SYNC high (≥1.2V) enables pulse-skipping mode. The pin must not float - tie to GND or VDD as needed. Internal hysteresis prevents false triggering from noise.
LT8602IUJ#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:
- 4
- 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)
LT8602IUJ#TRPBF FAQ
1.How can I place an order for LT8602IUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8602IUJ#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 LT8602IUJ#TRPBF reliable?
The price and inventory of LT8602IUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8602IUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8602IUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8602IUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8602IUJ#TRPBF?
LT8602IUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8602IUJ#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 LT8602IUJ#TRPBF?
For technical support, including LT8602IUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8602IUJ#TRPBF requirements.
6.How does Aetrix verify that LT8602IUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8602IUJ#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 LT8602IUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8602IUJ#TRPBF?
All LT8602IUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8602IUJ#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 LT8602IUJ#TRPBF part is unused and in its original packaging.
Return procedure for LT8602IUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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