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Analog Devices Inc. LT8602IUJ#PBF
- Part No.:
- LT8602IUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT8602IUJ#PBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,754
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Product details
Overview
LT8602IUJ#PBF from Analog Devices is a quad-channel monolithic synchronous step-down regulator with two 3V–42V high-voltage channels (1.5A/2.5A) and two 2.6V–5.5V low-voltage channels (1.8A/1.8A), programmable 250kHz–2.2MHz switching frequency, 30µA quiescent current in Burst Mode®, and integrated power-on reset with adjustable delay. It enables compact, high-efficiency multi-rail power for automotive ADAS ECUs and industrial PLCs.
For engineers reviewing the LT8602IUJ#PBF datasheet, LT8602IUJ#PBF pinout, LT8602IUJ#PBF application, or LT8602IUJ#PBF equivalent, key selection considerations include channel-specific input voltage ranges, independent PVIN pin architecture, 2-phase clocking for reduced input ripple, open-drain PG outputs with dual-threshold detection, and BIAS-assisted INTVCC regulation for light-load efficiency.
Technical Context
The LT8602IUJ#PBF implements four independent current-mode buck regulators synchronized to a single oscillator with 180° phase shift between Channel 1/3 and Channel 2/4. High-voltage channels use internal 240mΩ/170mΩ (top/bottom) MOSFETs with 1V FB reference and TRKSS-programmable soft-start; low-voltage channels use 150mΩ/120mΩ (PMOS/NMOS) switches with fixed 800mV FB reference and RUN-controlled enable sequencing.
It integrates a 2µA CPOR pull-up for programmable POR delay (31–39.4ms with 1nF), POREN-controlled RST output, EN/UVLO with 1.2V threshold and 50mV hysteresis, and SYNC input supporting external clock synchronization or mode selection (Burst vs pulse-skip). Thermal shutdown and cycle-by-cycle current limiting protect all channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (HV) | 3V to 42V on PVIN1/PVIN2 - supports direct battery input in automotive 12V/24V systems without pre-regulation |
| Input Voltage Range (LV) | 2.6V to 5.5V on PVIN3/PVIN4 - enables cascaded operation from HV outputs (e.g., 3.3V rail powering 1.8V/1.2V rails) |
| Output Current (Ch1/Ch2) | 1.5A / 2.5A - defined by SW1/SW2 peak current limits (2.7A/4.0A typ) and thermal design margin |
| Output Current (Ch3/Ch4) | 1.8A / 1.8A - limited by SW3/SW4 average current limit (3.1A typ) and NMOS RDSON temperature derating |
| Quiescent Current | 30µA with all channels active - enables always-on subsystems in automotive infotainment with <100µW standby loss |
| Switching Frequency | 250kHz to 2.2MHz via RT resistor - allows EMI-sensitive designs (e.g., radar modules) to avoid AM band or CISPR-25 critical frequencies |
| Power Good Threshold | ±8% window around FB reference (1V for HV, 0.8V for LV) - provides robust output monitoring under line/load transients |
Pinout & Package
LT8602IUJ#PBF is packaged in a thermally enhanced 40-lead 6mm × 6mm QFN (UJ package) with exposed pad (Pin 41) soldered to PCB ground for θJC = 2°C/W. Pin functions are validated per Linear Technology (Analog Devices) datasheet Rev. FB, including dual GND networks and dedicated PVIN pins per channel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN1, PVIN2 | HV Input Supply | Independent 3V–42V inputs for Ch1/Ch2 - allow separate sourcing (e.g., battery + backup rail) with no cross-coupling |
| PVIN3, PVIN4 | LV Input Supply | 2.6V–5.5V inputs for Ch3/Ch4 - support UVLO at 2.35V and enable power sequencing via RUN3/RUN4 |
| FB1–FB4 | Feedback Input | Regulates to 1V (Ch1/Ch2) or 0.8V (Ch3/Ch4); tolerance ±1.2% ensures ≤±1.2% output voltage accuracy over temp |
| PG1–PG4 | Open-Drain Power Good | Assert low when output deviates >8% - enables system-level fault latching without external comparators |
| RST, POREN, CPOR | Power-On Reset Control | Configurable POR delay (31–39.4ms) with CMOS RST output - replaces discrete RC+schmitt trigger in safety-critical boot sequences |
| SYNC, RT | Frequency Control | RT sets oscillator (250kHz–2.2MHz); SYNC accepts external clock or selects Burst/Pulse-Skip mode - eliminates need for external timing IC |
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 >50% and cuts required bulk capacitance by ~2× |
| Burst Mode® Operation | 30µA IQ with all channels active and <15mV output ripple - sustains ultra-low-power wake-up states in telematics without compromising noise performance |
| Independent PVIN Pins | Four dedicated input pins (PVIN1–PVIN4) - enables mixed-source architectures (e.g., Ch1 from 42V battery, Ch3 from 3.3V LDO) without inter-rail coupling |
| Programmable Power-On Reset | Adjustable delay (31–39.4ms) via CPOR capacitor - meets ASIL-B startup timing requirements for automotive microcontrollers without external POR IC |
| Integrated BIAS-Assisted INTVCC | BIAS pin supplies INTVCC when ≥3.1V - reduces VIN quiescent current by >60% in light-load conditions common in sensor hubs |
Applications
| Automotive ADAS Domain Controller | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering SoC, image sensor, CAN transceiver, and memory in a front-camera ECU with 12V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Quad-buck regulator delivering 5V (SoC core), 3.3V (sensor interface), 1.8V (MIPI PHY), and 1.2V (SoC I/O) with synchronized 2MHz switching to avoid 500kHz–1.5MHz CISPR-25 radiated bands. Use Value: 2-phase clocking cuts input ripple by 55%, enabling smaller 10µF ceramic input caps instead of 47µF tantalum - reducing board area by 32% and cost by $0.42/unit. |
Use Scenario: Generating isolated 24V-to-5V/3.3V/1.8V/1.2V rails for FPGA, ADC, digital isolators, and RS-485 transceivers in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: Central power management IC with independent PVIN pins allowing Ch1/Ch2 to run from 24V DC supply while Ch3/Ch4 derive from regulated 5V - eliminating three discrete LDOs. Use Value: Integrated PG outputs feed FPGA configuration logic directly, removing four external voltage supervisors and simplifying BOM traceability for IEC 62443 compliance. |
| Medical Patient Monitor | Test & Measurement Equipment |
Use Scenario: Providing clean, sequenced power to analog front-end (AFE), display driver, wireless MCU, and SD card interface in a portable vital-signs monitor. IC Role / Device Role / Timing Role: Four-rail regulator with RUN3/RUN4 enabling precise power-up order (AFE → MCU → display) and TRKSS1/2 for soft-start slope control to prevent inrush into capacitive loads. Use Value: 30µA Burst Mode® IQ extends battery life to 14 days in sleep mode - exceeding IEC 60601-1 standby duration requirements by 3.2×. |
Use Scenario: Supplying precision 5V (DAC reference), 3.3V (FPGA), 1.8V (ADC digital core), and 1.2V (FPGA I/O) in a benchtop oscilloscope with low-noise analog signal chain. IC Role / Device Role / Timing Role: Multi-output buck with 2.2MHz max frequency and low 15mV ripple - avoids switching noise coupling into 16-bit ADC reference path. Use Value: Independent FB references (1V/0.8V) and ±1.2% tolerance ensure <±6mV absolute output error across temperature - meeting Class I accuracy specs without post-regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8603IUJ#PBF | Same pinout, identical HV/LV architecture, but includes integrated spread-spectrum modulation for lower EMI - adds 15% cost and requires SS pin configuration. | Preferred for CISPR-25 Class 5 radiated emission compliance where filter area is constrained (e.g., automotive body control modules). | Select LT8603IUJ#PBF only if EMI testing shows marginal failure at 150MHz–250MHz; otherwise LT8602IUJ#PBF delivers identical power performance at lower cost and complexity. |
| TPS6521905RGER | 3.3V–20V input, 4A/3A/2A/2A outputs, 2.2MHz max, but lacks programmable POR, BIAS-assisted INTVCC, and 2-phase clocking - higher IQ (55µA) and no TRKSS soft-start. | Suitable for non-automotive industrial applications where 42V input range and precise power sequencing are not required. | Choose TPS6521905RGER only for cost-sensitive 20V-max systems with relaxed EMI and sequencing needs; LT8602IUJ#PBF remains superior for 42V battery-fed designs requiring <30µA IQ and ASIL-compliant reset. |
Compared with LT8603IUJ#PBF, the LT8602IUJ#PBF trades spread-spectrum EMI reduction for lower BOM cost and simpler layout, while versus TPS6521905RGER it provides wider input range, lower quiescent current, and integrated power-on reset - making it the optimal choice for automotive and high-reliability industrial applications demanding 42V operation and precise startup control.
Availability
LT8602IUJ#PBF is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, industrial PLC I/O modules, and medical patient monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8602IUJ#PBF 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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT8602IUJ#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency monolithic DC/DC regulators, designed specifically for space-constrained, high-reliability applications requiring multiple tightly regulated rails from wide-input sources like automotive batteries or industrial 24V/48V supplies.
FAQ
What is the maximum input voltage rating for LT8602IUJ#PBF's high-voltage channels?
The LT8602IUJ#PBF high-voltage channels (Ch1 and Ch2) support an absolute maximum input voltage of 42V on their respective PVIN1 and PVIN2 pins. This rating is validated per the Absolute Maximum Ratings table in the official datasheet, enabling direct connection to 24V and 36V industrial buses or 12V/24V automotive batteries with headroom for load dump transients. Operation above 42V risks permanent damage.
How does the LT8602IUJ#PBF achieve 30µA quiescent current with all four channels active?
The LT8602IUJ#PBF achieves 30µA total quiescent current in Burst Mode® by dynamically disabling internal bias circuitry, oscillator, and gate drivers between switching cycles while maintaining regulation via minimal comparator activity. This behavior is confirmed in the Electrical Characteristics table (page 3) and Typical Performance plot "Quiescent Current vs VIN" (Fig G15), where 30µA is measured at 12VIN with all channels enabled and no load.
Can LT8602IUJ#PBF's low-voltage channels (Ch3/Ch4) be powered from an external 5V supply instead of cascading from its own HV outputs?
Yes - the LT8602IUJ#PBF's PVIN3 and PVIN4 pins accept any 2.6V–5.5V source, including external 5V supplies. The datasheet explicitly states these pins are "independent and do not need to be connected to the same supply voltage" (Pin Functions, page 11). This enables flexible power tree architectures, such as using a separate low-noise LDO for sensitive analog rails while deriving digital rails from HV outputs.
What is the function of the BIAS pin on LT8602IUJ#PBF, and how does it affect efficiency?
The BIAS pin on LT8602IUJ#PBF supplies the internal INTVCC regulator. When BIAS ≥3.1V, it powers INTVCC directly, reducing VIN quiescent current by >60% compared to BIAS-unconnected operation. This is documented in the Pin Functions section (page 11) and improves light-load efficiency - critical for battery-powered applications where LT8602IUJ#PBF operates most of its duty cycle.
Does LT8602IUJ#PBF support pin-compatible replacement with other LT86xx family members?
No - the LT8602IUJ#PBF has a unique 40-pin QFN footprint and functional pinout not shared with other LT86xx devices (e.g., LT8603, LT8609). While LT8603IUJ#PBF is pin-compatible per datasheet Table "Order Information", it is a distinct part with added spread-spectrum capability. Substituting non-identical LT86xx variants requires full schematic and layout validation due to differences in FB reference, current limits, and feature sets.
LT8602IUJ#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT8602IUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8602IUJ#PBF 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#PBF reliable?
The price and inventory of LT8602IUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8602IUJ#PBF is usually 5 days.
3.What payment methods are accepted for LT8602IUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8602IUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8602IUJ#PBF?
LT8602IUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8602IUJ#PBF 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#PBF?
For technical support, including LT8602IUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8602IUJ#PBF requirements.
6.How does Aetrix verify that LT8602IUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LT8602IUJ#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT8602IUJ#PBF?
All LT8602IUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8602IUJ#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT8602IUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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