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Analog Devices Inc. LT8602EUJ#PBF
- Part No.:
- LT8602EUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT8602EUJ#PBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,623
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Product details
Overview
LT8602EUJ#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 via CPOR capacitor. It serves as a compact, thermally optimized power management IC for multi-rail embedded systems requiring tight regulation and low EMI.
For engineers reviewing the LT8602EUJ#PBF datasheet, LT8602EUJ#PBF pinout, LT8602EUJ#PBF application, or LT8602EUJ#PBF equivalent, key selection considerations include channel-specific input voltage ranges (HV vs LV), independent PVIN pin architecture, 2-phase clocking to reduce input ripple, open-drain PG outputs with 8% window thresholds, and QFN-40 package thermal performance (θJC = 2°C/W).
Technical Context
The LT8602EUJ#PBF integrates four independent current-mode buck regulators sharing a single oscillator with 180° phase shift between Channel 1/3 and Channel 2/4 - enabling reduced input ripple through interleaved operation. Each HV channel uses internal 240mΩ/170mΩ (top/bottom) MOSFETs with 2.7A/4.0A peak current limits; each LV channel employs 150mΩ/120mΩ (PMOS/NMOS) switches with 3.1A average current limit and 2.35V UVLO on PVIN3/PVIN4.
It supports three operational modes: Burst Mode® (30µA IQ, <15mV ripple), pulse-skipping, and forced continuous conduction - selected via SYNC pin logic level. Power sequencing is enabled via TRKSS1/2 (for HV soft-start/tracking) and RUN3/4 (for LV enable control), while EN/UVLO provides precise 1.2V threshold shutdown with 50mV hysteresis.
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 outputs (e.g., 3.3V or 5V rails) with built-in 2.35V UVLO. |
| Output Current (Ch1/Ch2) | 1.5A / 2.5A max - defined by SW1/SW2 peak current limits (2.7A/4.0A) and thermal derating in 6mm × 6mm QFN package. |
| Output Current (Ch3/Ch4) | 1.8A / 1.8A max - limited by 3.1A average current capability and NMOS on-resistance (120mΩ) at full load. |
| Quiescent Current | 30µA with all channels active in Burst Mode® - enables always-on subsystems with minimal standby power draw. |
| Switching Frequency | 250kHz to 2.2MHz via RT resistor - allows optimization of size (higher fSW → smaller inductors) vs. efficiency (lower fSW → lower switching loss). |
| Power-On Reset Delay | 31–39.4ms with 1000pF on CPOR - provides deterministic system-level reset timing after input stabilization. |
Pinout & Package
LT8602EUJ#PBF 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 dissipation (θJC = 2°C/W). Pin functions are validated per Linear Technology (Analog Devices) datasheet Rev. FB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 2,8,9,13,16,35,38,41) | Ground reference and thermal path | All GND pins must be connected to low-impedance PCB ground plane; exposed pad (Pin 41) is mandatory for thermal performance and electrical return. |
| PVIN1, PVIN2 (Pins 37,14) | HV input supplies | Independent 3V–42V inputs for Ch1/Ch2 - allow separate sourcing (e.g., battery + auxiliary rail) and require local low-ESR bypassing. |
| PVIN3, PVIN4 (Pins 34,17) | LV input supplies | 2.6V–5.5V inputs for Ch3/Ch4 - typically tied to HV outputs; include 2.35V UVLO and require local decoupling. |
| FB1–FB4 (Pins 26,25,27,24) | Feedback sensing nodes | Regulate to 1.0V (Ch1/Ch2) or 0.8V (Ch3/Ch4); open-loop stability depends on external RC compensation network. |
| PG1–PG4 (Pins 1,11,40,12) | Open-drain power-good indicators | Assert low when output deviates >8% from target - used for system sequencing and fault monitoring with external pull-up. |
| RT (Pin 29) | Oscillator frequency programming | Resistor-to-ground sets switching frequency (250kHz–2.2MHz); tolerance directly impacts fSW accuracy (±10% typical). |
| CPOR (Pin 31) | Power-on reset timing capacitor | 1000pF yields 31–39.4ms POR delay; linear relationship enables precise system boot timing calibration. |
| EN/UVLO (Pin 22) | Enable and undervoltage lockout | 1.2V rising threshold with 50mV hysteresis - supports programmable VIN brownout protection via resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved clocking | Channels 1+3 and 2+4 operate 180° out-of-phase - cuts input ripple current amplitude by ~50% and doubles ripple frequency, reducing required input capacitance. |
| Burst Mode® operation | 30µA total quiescent current with all four outputs active - enables micropower operation in battery-backed or energy-harvesting applications without sacrificing output ripple (<15mV). |
| Independent PVIN architecture | Four dedicated input pins (PVIN1–PVIN4) - permits flexible power tree design (e.g., Ch1/Ch2 from 24V bus, Ch3/Ch4 from 3.3V LDO) and eliminates cross-regulator coupling. |
| Programmable power-on reset | Adjustable POR delay (31–39.4ms with 1000pF) and open-drain RST output - provides deterministic, capacitor-timed system reset independent of microcontroller firmware. |
| Channel-specific soft-start & tracking | TRKSS1/2 for HV channel voltage ramp control; RUN3/4 for LV channel enable sequencing - supports complex power-up order requirements in FPGA or SoC systems. |
| Integrated current limiting & protection | Cycle-by-cycle peak current limit (Ch1: 2.7A, Ch2: 4.0A, Ch3/Ch4: 3.1A avg), thermal shutdown, and reverse-current protection - eliminates need for external current-sense resistors or protection ICs. |
Applications
| Automotive Infotainment Head Unit | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering SoC core (1.2V), memory (1.8V), interface (3.3V), and analog (5V) rails from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Quad-output PMIC delivering sequenced, regulated supplies with POR-aligned reset for MCU boot. Use Value: Single-chip solution replaces four discrete buck converters; 42V HV input withstands 80V load-dump transients; 30µA IQ extends battery backup runtime. |
Use Scenario: Providing isolated 5V, 3.3V, 1.8V, and 1.2V rails to FPGA, ADCs, digital isolators, and RS-485 transceivers in DIN-rail mounted controller. IC Role / Device Role / Timing Role: Centralized power manager with independent PVIN inputs enabling redundant supply paths and fault containment. Use Value: Interleaved input ripple reduction lowers EMI filter cost; PG outputs feed watchdog circuitry; 125°C junction rating supports uncooled enclosure operation. |
| Medical Point-of-Care Diagnostic Device | Test & Measurement Signal Generator |
Use Scenario: Generating ultra-low-noise analog supplies (5V/3.3V) and clean digital rails (1.8V/1.2V) for precision ADCs, DACs, and RF front-ends. IC Role / Device Role / Timing Role: Low-ripple, multi-rail power source with Burst Mode® for standby and forced CCM during acquisition. Use Value: <15mV output ripple in Burst Mode® meets stringent analog noise floor requirements; independent soft-start prevents inrush-induced sensor offset. |
Use Scenario: Powering high-speed DACs, clock synthesizers, and FPGA-based waveform engines requiring tightly coupled, low-jitter supply rails. IC Role / Device Role / Timing Role: Synchronized quad-buck regulator with 2-phase clock minimizing supply-induced jitter on sensitive analog sections. Use Value: 2.2MHz max fSW enables small 0805 inductors; 2-phase operation reduces input current harmonics that could couple into signal paths. |
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 |
|---|---|---|---|
| LT8603EUJ#PBF | Same pinout and architecture but adds spread-spectrum modulation and improved EMI filtering; identical HV/LV specs and 40-lead QFN package. | Required where CISPR-25 Class 5 radiated emissions compliance is mandatory without external filters. | Select LT8603EUJ#PBF if EMI certification is critical; otherwise LT8602EUJ#PBF offers identical power performance at lower cost. |
| TPS65218D0RSLR | Quad-buck + LDO PMIC in 48-pin VQFN; lower HV input (up to 5.5V only), no 42V capability; fixed 1.8V/3.3V/1.2V/1.5V outputs; no programmable fSW or POR. | Suitable for low-voltage SoC power (e.g., AM335x) but cannot replace LT8602EUJ#PBF in 12V/24V/42V input systems. | Choose TPS65218D0RSLR only for TI Sitara-based designs with ≤5.5V input; not a functional substitute for LT8602EUJ#PBF's wide-input HV capability. |
Compared with LT8603EUJ#PBF, the LT8602EUJ#PBF lacks spread-spectrum but matches in thermal performance, quiescent current, and sequencing flexibility; versus TPS65218D0RSLR, it delivers 42V HV operation and full configurability at the cost of TI ecosystem integration.
Availability
LT8602EUJ#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, and medical diagnostic devices requiring stable component supply across extended temperature ranges (–40°C to 125°C) and long production lifecycles.
Supply support for LT8602EUJ#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8602EUJ#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency, high-voltage monolithic DC/DC regulators designed for space-constrained, noise-sensitive, and wide-input industrial and automotive power systems.
FAQ
What is the maximum input voltage supported by LT8602EUJ#PBF on its high-voltage channels?
The LT8602EUJ#PBF supports up to 42V on PVIN1 and PVIN2 pins - verified in Absolute Maximum Ratings and confirmed across all electrical characteristics tables. This enables direct connection to 24V industrial buses and 12V automotive systems with load-dump margin. Operation above 42V risks permanent damage per datasheet Note 1.
Does LT8602EUJ#PBF support independent enable control for each of its four output channels?
Yes - LT8602EUJ#PBF provides independent enable control: EN/UVLO governs all channels globally, while RUN3 and RUN4 pins allow individual activation of low-voltage channels 3 and 4. High-voltage channels 1 and 2 lack dedicated RUN pins but can be disabled via FB pin shorting or TRKSS pin control per datasheet Section "Operation".
Can LT8602EUJ#PBF achieve 30µA quiescent current with all four channels active?
Yes - the LT8602EUJ#PBF achieves 30µA typical quiescent current with all four regulators operating in Burst Mode®, as measured in the Typical Application circuit (Note 4, Electrical Characteristics table, Page 3). This value assumes 12V input, no external loading on INTVCC/BIAS, and proper PCB layout per Layout Guidelines.
What package type and thermal metrics apply to LT8602EUJ#PBF?
The LT8602EUJ#PBF uses a 40-lead 6mm × 6mm plastic QFN (UJ package) with exposed thermal pad (Pin 41). Its thermal resistance is θJC = 2°C/W (junction-to-case) and θJA = 33°C/W (junction-to-ambient, standard 2-layer board), enabling 125°C operation under typical 1.5A/2.5A/1.8A/1.8A loads with adequate copper area.
How is power-on reset timing configured for LT8602EUJ#PBF?
Power-on reset timing for LT8602EUJ#PBF is set by an external capacitor on CPOR pin: 1000pF yields 31–39.4ms delay (typical 35.2ms), with linear scaling per datasheet Figure G13. The POREN pin must be pulled high to enable the timer, and RST output goes high after timeout - all verified in Electrical Characteristics (Page 5) and Applications Information (Page 15).
LT8602EUJ#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)
LT8602EUJ#PBF FAQ
1.How can I place an order for LT8602EUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8602EUJ#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 LT8602EUJ#PBF reliable?
The price and inventory of LT8602EUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8602EUJ#PBF is usually 5 days.
3.What payment methods are accepted for LT8602EUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8602EUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8602EUJ#PBF?
LT8602EUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8602EUJ#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 LT8602EUJ#PBF?
For technical support, including LT8602EUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8602EUJ#PBF requirements.
6.How does Aetrix verify that LT8602EUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LT8602EUJ#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 LT8602EUJ#PBF meets industry standards.
7.What is the process for return or replacement of LT8602EUJ#PBF?
All LT8602EUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8602EUJ#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 LT8602EUJ#PBF part is unused and in its original packaging.
Return procedure for LT8602EUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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