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Analog Devices Inc. LT8601EUJ#TRPBF
- Part No.:
- LT8601EUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT8601EUJ#TRPBF.pdf
- Description:
- IC REG BUCK ADJ TRPL 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,317
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Product details
Overview
LT8601EUJ#TRPBF from Analog Devices is a triple-channel monolithic synchronous step-down regulator with programmable power-on reset, supporting 3.0–42V HV inputs (OUT1: 5V/1.5A, OUT2: 3.3V/2.5A) and 2.6–5.5V LV input (OUT3: 1.8V/1.8A), operating up to 2.2MHz with 30µA quiescent current in Burst Mode and AEC-Q100 qualification for automotive systems.
For engineers reviewing the LT8601EUJ#TRPBF datasheet, LT8601EUJ#TRPBF pinout, LT8601EUJ#TRPBF application, or LT8601EUJ#TRPBF equivalent, this page delivers verified specifications including 40-lead 6mm × 6mm QFN package, 2-phase clock architecture reducing input ripple, cycle-by-cycle current limit per channel, and integrated power-good indicators for all three outputs.
Technical Context
The LT8601EUJ#TRPBF integrates two high-voltage synchronous buck regulators (PVIN1/PVIN2, 3.0–42V input) and one low-voltage synchronous buck regulator (PVIN3, 2.6–5.5V input), each with independent feedback (FB1/FB2 = 1.0V, FB3 = 0.8V), programmable switching frequency (250kHz–2.2MHz via RT resistor), and 180° phase-shifted CLK1/CLK2 timing to reduce combined input ripple.
It implements micropower Burst Mode operation (30µA IQ with all channels active), programmable power-on reset (CPOR capacitor-timed), EN/UVLO with 1.20V rising threshold, and open-drain PG1–PG3 outputs with ±8% regulation window - all within a thermally enhanced 40-lead QFN package with exposed GND pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (HV) | 3.0V to 42V on PVIN1/PVIN2 - supports automotive transients up to 42V without external protection. |
| Input Voltage Range (LV) | 2.6V to 5.5V on PVIN3 - enables direct sourcing from HV outputs (e.g., 3.3V or 5V rails). |
| Output Currents | OUT1: 1.5A, OUT2: 2.5A, OUT3: 1.8A - defined by internal MOSFET RDS(ON) (e.g., SW2 top/bottom: 150mΩ/100mΩ). |
| Switching Frequency | 250kHz to 2.2MHz (RT-programmable) - enables trade-off between small magnetics (high-f) and peak efficiency (low-f). |
| Quiescent Current | 30µA with all channels active, no load - enables always-on subsystems in automotive infotainment or ADAS. |
| Power Good Threshold | ±8% of VFB (0.92V–1.08V for HV, 0.736V–0.864V for LV) - provides precise output monitoring for system sequencing. |
| Operating Temperature | –40°C to +125°C junction - qualified per AEC-Q100 Grade E for under-hood automotive use. |
Pinout & Package
LT8601EUJ#TRPBF is housed in a thermally enhanced 40-lead (6mm × 6mm) plastic QFN package with exposed GND pad (Pin 41), requiring soldering to PCB ground for thermal and electrical integrity. θJA = 33°C/W, θJC = 2°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 2,8,9,13,16,27,30,34,35,38,40,41) | Ground reference & thermal path | Multiple dedicated GND pins and exposed pad ensure low-impedance return and efficient heat dissipation. |
| PVIN1, PVIN2 (Pins 37,14) | HV input supply for Channel 1 & 2 | Independent inputs allow separate sourcing (e.g., battery vs. alternator rail) and local bypassing. |
| PVIN3 (Pin 17) | LV input supply for Channel 3 | Designed to accept regulated HV outputs (e.g., 3.3V or 5V) - includes 2.35V UVLO for safety. |
| SW1, SW2, SW3 (Pins 3,6/7,15) | Switch node outputs | SW2 pins 6 & 7 must be shorted externally; all SW nodes drive external inductors directly. |
| FB1, FB2, FB3 (Pins 26,25,24) | Feedback voltage sensing | Regulates to 1.0V (HV) or 0.8V (LV); precision references enable accurate output setting via resistor dividers. |
| PG1, PG2, PG3 (Pins 1,11,12) | Open-drain power-good indicators | Assert low when corresponding output deviates >8% - used for system enable/disable sequencing. |
| RT (Pin 29) | Oscillator frequency programming | Resistor-to-ground sets fSW from 250kHz to 2.2MHz - enables EMI optimization and size/efficiency tuning. |
| CPOR (Pin 31) | Power-on reset timer capacitor | External capacitor programs POR delay (e.g., 35.2ms typ. with 1000pF) - ensures clean system boot. |
| RST (Pin 32) | Reset output signal | CMOS output held low until CPOR timeout - synchronizes downstream logic or microcontroller reset. |
| EN/UVLO (Pin 22) | Enable & input undervoltage lockout | 1.20V rising threshold enables precise VIN monitoring; hysteresis prevents noise-induced shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output monolithic integration | Eliminates need for three discrete regulators, reducing BOM count, layout area, and inter-channel timing skew. |
| 2-phase interleaved clock (CLK1/CLK2) | Reduces total input ripple current by ~50% and cuts required input capacitance vs. single-phase operation. |
| Burst Mode® at light load | Maintains <15mV output ripple while achieving 30µA quiescent current - critical for battery-backed systems. |
| Independent PVIN supplies | Enables flexible power tree design: e.g., PVIN1 from 12V battery, PVIN2 from 24V alternator, PVIN3 from 5V rail. |
| AEC-Q100 Grade E qualification | Validated for automotive applications including infotainment, telematics, and body control modules. |
| Programmable power-on reset | CPOR capacitor sets deterministic reset delay (31–39.4ms typ.), ensuring reliable MCU initialization timing. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module Power |
|---|---|
Use Scenario: Providing stable 5V, 3.3V, and 1.8V rails to SoC, memory, and image sensor in vehicle head units. IC Role / Device Role / Timing Role: Primary triple-output PMIC delivering sequenced, monitored power with AEC-Q100 reliability. Use Value: Single-chip solution replaces three discrete DC/DCs, reduces board space by >40%, and meets CISPR25 Class 5 EMI limits at 2MHz. |
Use Scenario: Powering high-speed MIPI CSI-2 camera sensors and companion processors in forward-facing ADAS cameras. IC Role / Device Role / Timing Role: Synchronous buck regulator supplying low-noise 1.8V core and 3.3V I/O with precise PG signaling for sensor startup. Use Value: 30µA quiescent current extends sleep-mode battery life; 2-phase clock minimizes input ripple affecting image sensor analog performance. |
| Industrial PLC I/O Module | Medical Portable Diagnostic Device |
Use Scenario: Generating isolated 5V, 3.3V, and 1.8V supplies for microcontroller, ADC, and digital isolators in DIN-rail PLCs. IC Role / Device Role / Timing Role: High-efficiency, wide-input regulator supporting 24V industrial bus with transient tolerance to 42V. Use Value: 93% peak efficiency at full load reduces thermal stress; programmable fSW allows EMI filtering optimization in dense control cabinets. |
Use Scenario: Powering low-power ARM Cortex-M based diagnostic instruments with battery backup and USB charging. IC Role / Device Role / Timing Role: Triple-output buck managing main system rail (5V), peripheral interface (3.3V), and sensor bias (1.8V) with ultra-low IQ. Use Value: 30µA IQ extends battery runtime during standby; PG outputs coordinate safe shutdown before battery depletion. |
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 |
|---|---|---|---|
| LT8602EUJ#TRPBF | Same pinout, higher current: OUT1=2.5A, OUT2=3.5A, OUT3=2.5A; identical 42V HV range and 2.2MHz max fSW. | Required where higher output current or lower RDS(ON) (e.g., SW2 top: 120mΩ vs. 150mΩ) is needed for thermal margin. | Select LT8602EUJ#TRPBF when load currents exceed 1.5A/2.5A/1.8A or when lower conduction loss is critical. |
| TPS6521905RGER | 3.3V/1.8V dual-output only; no HV channel; 5.5V max input; integrated LDOs; different pinout and control interface. | Targeted at low-voltage, cost-sensitive applications (e.g., consumer IoT) without automotive or high-input requirements. | Choose TPS6521905RGER only for non-automotive, sub-6V systems where HV capability and AEC-Q100 are unnecessary. |
Compared with LT8602EUJ#TRPBF, the LT8601EUJ#TRPBF offers lower cost and smaller thermal footprint for mid-range current needs; versus TPS6521905RGER, it delivers essential 42V automotive input resilience, triple independent outputs, and AEC-Q100 compliance - making it irreplaceable in harsh-environment designs.
Availability
LT8601EUJ#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial PLC I/O requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LT8601EUJ#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 precision instrumentation, industrial automation, and automotive markets since 1965.
The LT8601EUJ#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency monolithic DC/DC regulators, engineered specifically for demanding automotive and industrial applications requiring wide input range, low IQ, and robust reliability.
FAQ
What is the maximum input voltage rating for LT8601EUJ#TRPBF?
The LT8601EUJ#TRPBF supports up to 42V on its high-voltage input pins (PVIN1 and PVIN2), with absolute maximum ratings specified at –0.3V to 42V. The low-voltage input (PVIN3) is rated for –0.3V to 6V. This 42V rating accommodates automotive load-dump transients without external clamping, making LT8601EUJ#TRPBF suitable for 12V and 24V vehicle systems.
Does LT8601EUJ#TRPBF support synchronization to an external clock?
Yes, LT8601EUJ#TRPBF supports external clock synchronization via the SYNC pin (Pin 33). When a digital clock signal within 0.25MHz–2.2MHz is applied, the device locks its internal oscillator and operates in pulse-skipping mode. This capability enables EMI reduction through frequency dithering or alignment with system clocks - a key feature confirmed in the Electrical Characteristics table and Block Diagram.
How is power sequencing controlled across the three outputs of LT8601EUJ#TRPBF?
LT8601EUJ#TRPBF enables power sequencing via TRKSS1/TRKSS2 pins (for OUT1/OUT2) and RUN3 (for OUT3). TRKSS pins allow tracking of one output to another's ramp, while RUN3 requires ≥0.72V to enable the LV channel. Combined with independent PG1–PG3 signals and programmable CPOR/RST, LT8601EUJ#TRPBF provides full hardware-based sequencing - critical for FPGAs and multi-rail processors.
What thermal performance can be expected from LT8601EUJ#TRPBF in a standard 4-layer PCB layout?
In a standard 4-layer PCB with 2oz copper and adequate thermal vias under the exposed pad, LT8601EUJ#TRPBF achieves θJA = 33°C/W. At full load (1.5A+2.5A+1.8A) and 25°C ambient, junction temperature rise is ~65°C - well within the –40°C to +125°C operating range. Derating curves in the datasheet confirm stable operation up to 125°C junction, validated per AEC-Q100 Grade E.
Is LT8601EUJ#TRPBF pin-compatible with other members of the LT860x family?
Yes, LT8601EUJ#TRPBF shares identical 40-lead 6mm × 6mm QFN packaging and pinout with LT8602EUJ#TRPBF and LT8603EUJ#TRPBF. This allows drop-in replacement where higher current (LT8602) or additional features (LT8603) are later required - a design flexibility explicitly documented in Analog Devices' ordering information table and package drawings.
LT8601EUJ#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:
- 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)
LT8601EUJ#TRPBF FAQ
1.How can I place an order for LT8601EUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8601EUJ#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 LT8601EUJ#TRPBF reliable?
The price and inventory of LT8601EUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8601EUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8601EUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8601EUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8601EUJ#TRPBF?
LT8601EUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8601EUJ#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 LT8601EUJ#TRPBF?
For technical support, including LT8601EUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8601EUJ#TRPBF requirements.
6.How does Aetrix verify that LT8601EUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8601EUJ#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 LT8601EUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8601EUJ#TRPBF?
All LT8601EUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8601EUJ#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 LT8601EUJ#TRPBF part is unused and in its original packaging.
Return procedure for LT8601EUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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