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Analog Devices Inc. LT8601IUJ#PBF
- Part No.:
- LT8601IUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT8601IUJ#PBF.pdf
- Description:
- IC REG BUCK ADJ TRPL 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:734
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Product details
Overview
LT8601IUJ#PBF from Analog Devices is a triple-channel monolithic synchronous step-down regulator with programmable power-on reset, supporting 3.0V–42V HV inputs (OUT1: 1.5A @ 5V; OUT2: 2.5A @ 3.3V) and 2.6V–5.5V LV input (OUT3: 1.8A @ 1.8V), delivering up to 93% efficiency at 2MHz in automotive and industrial power systems.
For engineers reviewing the LT8601IUJ#PBF datasheet, LT8601IUJ#PBF pinout, LT8601IUJ#PBF application, or LT8601IUJ#PBF equivalent, key selection criteria include its 40-lead 6mm × 6mm QFN package, 30µA quiescent current in Burst Mode, 2-phase clocking for reduced input ripple, AEC-Q100 qualification, and independent PVIN/EN/PG/RT/SYNC control per channel.
Technical Context
The LT8601IUJ#PBF integrates two high-voltage synchronous buck regulators (PVIN1/PVIN2, 3.0V–42V, 1.5A/2.5A) and one low-voltage synchronous buck (PVIN3, 2.6V–5.5V, 1.8A), all synchronized to a single adjustable oscillator (250kHz–2.2MHz). Channel 1 operates on CLK1; channels 2 and 3 share CLK2 (180° out-of-phase) to halve input ripple frequency and reduce required bulk capacitance.
It features cycle-by-cycle current limiting (SW1: 2.7A typ; SW2: 4.0A typ; SW3: 3.2A typ), programmable POR via CPOR capacitor (35.2ms typ), open-drain PG1–PG3 comparators with ±8% thresholds, and dual-mode light-load operation (Burst Mode or pulse-skipping) selectable via SYNC pin logic level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | HV channels: 3.0V–42V; LV channel: 2.6V–5.5V - supports wide automotive transients and cascaded supply architectures. |
| Output Currents | OUT1: 1.5A max; OUT2: 2.5A max; OUT3: 1.8A max - enables distributed 5V/3.3V/1.8V rail generation from single source. |
| Switching Frequency | 250kHz–2.2MHz (RT-programmable) - balances inductor size (e.g., 1µH at 2MHz) vs. efficiency (93% at 1MHz). |
| Quiescent Current | 30µA with all channels active, no load - sustains ultra-low standby power in always-on automotive modules. |
| Efficiency | Up to 93% (HV), 95% (LV) - achieved via integrated synchronous MOSFETs (SW1 RDS(ON): 240/170 mΩ top/bottom). |
| Power-On Reset | Programmable 31–39.4ms delay (CPOR = 1nF–10nF) - ensures deterministic system boot sequencing before MCU release. |
| Package | 40-lead 6mm × 6mm QFN with exposed thermal pad - provides θJA = 33°C/W for high-power density in space-constrained layouts. |
Pinout & Package
LT8601IUJ#PBF uses a thermally enhanced 40-lead 6mm × 6mm plastic QFN package (UJ) with exposed GND pad (Pin 41) requiring PCB soldering for thermal and electrical integrity. Pin pitch is 0.5mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PG1 (Pin 1) | Power Good Indicator (Channel 1) | Open-drain output pulled low until FB1 reaches 0.92–1.08V - signals stable 5V rail for downstream logic enable. |
| PVIN1 (Pin 37) | HV Input Supply (Channel 1) | Independent 3.0V–42V input for OUT1 - allows separate sourcing from battery or DC-DC stage to optimize noise isolation. |
| SW1 (Pin 3) | Channel 1 Switch Node | Internal NMOS/PMOS switching node - connects directly to external inductor; requires tight layout to minimize EMI and voltage spikes. |
| FB1 (Pin 26) | Feedback Input (Channel 1) | Senses regulated 5V output via resistor divider; reference = 1.0V - sets output with ±1.2% accuracy over temperature. |
| RT (Pin 29) | Oscillator Frequency Control | Resistor-to-GND sets switching frequency (e.g., 28.7kΩ = 2.0MHz) - enables precise EMI tuning and component size optimization. |
Key Features
| Feature | Design Value |
|---|---|
| 2-Phase Clock Architecture | CLK1 (Ch1) and CLK2 (Ch2/Ch3) 180° out-of-phase - cuts peak input ripple current by ~50%, reducing input capacitor count and size. |
| Programmable Power-On Reset | CPOR pin accepts 100pF–10nF capacitor for 31–39.4ms timeout - ensures reliable microcontroller boot timing without external supervisor IC. |
| Independent Enable & Tracking | EN/UVLO (Pin 22), TRKSS1/2 (Pins 21/20), RUN3 (Pin 18) - enables flexible power sequencing across three rails for FPGA or SoC applications. |
| AEC-Q100 Qualified | Rated for –40°C to +125°C junction (I-grade) - validated for automotive infotainment, ADAS, and body control modules. |
| Burst Mode Operation | 30µA IQ with all outputs active, <15mV output ripple - maintains low-noise regulation during vehicle sleep mode without compromising EMC. |
Applications
| Automotive Infotainment System | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering head unit SoC (1.8V core), DDR memory (3.3V), and display interface (5V) from 12V battery with transient tolerance to 42V. IC Role / Device Role / Timing Role: Triple-output synchronous buck regulator providing sequenced, low-noise, high-efficiency rails with AEC-Q100 reliability. Use Value: Eliminates need for three discrete regulators and external POR circuitry; reduces BOM count by ≥7 components while meeting CISPR25 Class 5 EMI limits. | Use Scenario: Generating isolated 5V, 3.3V, and 1.8V supplies for microcontroller, analog front-end, and digital I/O in factory automation controller. IC Role / Device Role / Timing Role: Centralized multi-rail PMIC with independent enable and tracking for robust power-up/down sequencing. Use Value: Enables cold-swap capability and fault containment via per-channel PG indicators and current limiting - improves system uptime and diagnostics. |
| Distributed Telecom Power | Medical Diagnostic Imaging Board |
Use Scenario: Stepping down 48V intermediate bus to 5V (backplane), 3.3V (FPGA I/O), and 1.8V (FPGA core) in compact base station card. IC Role / Device Role / Timing Role: High-input-voltage triple buck with 2.2MHz max switching frequency to minimize passive size in dense layouts. Use Value: Achieves >90% efficiency at full load with 6mm × 6mm footprint - saves >250mm² vs. discrete solution while maintaining thermal margin. | Use Scenario: Powering low-noise ADCs, precision amplifiers, and ARM Cortex-M7 processor in portable ultrasound device with strict ripple requirements. IC Role / Device Role / Timing Role: Low-ripple Burst Mode regulator delivering <15mVpp output noise at light loads for analog signal integrity. Use Value: Maintains SNR >95dB in 16-bit ADC path without additional LDO post-regulation - simplifies thermal design and extends battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3372EDE#PBF | Octal-output, 4×2 configurable buck; max 600mA/channel; 2.25V–5.5V input only; no HV capability. | Targeted at low-voltage, high-channel-count applications (e.g., IoT sensors); lacks 42V HV support and automotive qualification. | Select when needing >3 outputs from low-VIN sources and fine-grained current allocation, not HV automotive rails. |
| MPQ4333GLED-AEC1-Z | Dual 3A/2A synchronous buck; 3.3V–36V input; no third channel or POR; non-AEC-Q100 (industrial grade only). | Requires external LDO or second IC for third rail; no integrated power-on reset or PG sequencing logic. | Select for cost-sensitive dual-rail automotive designs where third rail can be derived externally and POR is handled by MCU. |
Compared with LTC3372EDE#PBF and MPQ4333GLED-AEC1-Z, the LT8601IUJ#PBF uniquely delivers AEC-Q100-qualified triple-output regulation with 42V HV support, programmable POR, and 2-phase ripple reduction - making it the only drop-in solution for safety-critical 5V/3.3V/1.8V automotive power trees.
Availability
LT8601IUJ#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, and medical diagnostic imaging equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8601IUJ#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8601IUJ#PBF belongs to the Power by Linear™ family of high-efficiency monolithic DC/DC regulators, designed specifically for demanding automotive and industrial applications requiring wide VIN range, low IQ, and robust EMI performance.
FAQ
What is the maximum input voltage rating for LT8601IUJ#PBF's high-voltage channels?
The LT8601IUJ#PBF high-voltage channels (PVIN1 and PVIN2) have an absolute maximum rating of 42V, with recommended operating range from 3.0V to 42V. This allows direct connection to automotive 12V/24V batteries including load-dump transients. The LT8601IUJ#PBF internal protection circuits maintain safe operation up to this limit without external clamping.
How does LT8601IUJ#PBF achieve low quiescent current in standby mode?
The LT8601IUJ#PBF achieves 30µA typical quiescent current with all three channels active using micropower Burst Mode® operation, which disables most internal circuitry between switching cycles while preserving output regulation and low ripple. This behavior is enabled by grounding the SYNC pin and is confirmed in the datasheet's Typical Performance Characteristics (Figure G06).
Can LT8601IUJ#PBF generate three independent output voltages with different sequencing delays?
Yes. The LT8601IUJ#PBF supports independent sequencing via TRKSS1/TRKSS2 (for OUT1/OUT2 tracking) and RUN3 (for OUT3 enable threshold at 0.72V), plus programmable POR delay via CPOR capacitor. This allows precise staggered startup - e.g., enabling 5V first, then 3.3V after tracking, then 1.8V upon RUN3 threshold crossing - all within a single LT8601IUJ#PBF device.
What package type and thermal characteristics does LT8601IUJ#PBF use?
The LT8601IUJ#PBF uses a 40-lead 6mm × 6mm plastic QFN (UJ package) with exposed thermal pad (Pin 41 = GND). Its thermal resistance is θJA = 33°C/W and θJC = 2°C/W, enabling high-power density operation up to 125°C junction temperature. The exposed pad must be soldered to a large PCB copper area for optimal heat dissipation.
Is LT8601IUJ#PBF qualified for automotive applications, and what standards does it meet?
Yes. The LT8601IUJ#PBF is AEC-Q100 qualified for Grade I (–40°C to +125°C), with full characterization across temperature and lifetime testing. It meets CISPR25 Class 5 radiated emissions limits (verified on demo board DC2346A) and includes built-in protection features including cycle-by-cycle current limiting, thermal shutdown, and UVLO on all input pins - fulfilling critical automotive reliability requirements.
LT8601IUJ#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:
- 3
- 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)
LT8601IUJ#PBF FAQ
1.How can I place an order for LT8601IUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8601IUJ#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 LT8601IUJ#PBF reliable?
The price and inventory of LT8601IUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8601IUJ#PBF is usually 5 days.
3.What payment methods are accepted for LT8601IUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8601IUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8601IUJ#PBF?
LT8601IUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8601IUJ#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 LT8601IUJ#PBF?
For technical support, including LT8601IUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8601IUJ#PBF requirements.
6.How does Aetrix verify that LT8601IUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LT8601IUJ#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 LT8601IUJ#PBF meets industry standards.
7.What is the process for return or replacement of LT8601IUJ#PBF?
All LT8601IUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8601IUJ#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 LT8601IUJ#PBF part is unused and in its original packaging.
Return procedure for LT8601IUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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