A8586KLJTR-T-2 - 40V 3.5A Buck Regulator SOIC-8EP | Allegro
料号： A8586KLJTR-T-2 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.79 | $1.79 |
| 10 | $1.65 | $16.50 |
| 100 | $1.42 | $142.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $0.98 | $980.00 |
| 3,000 | $0.82 | $2,460.00 |
A8586KLJTR-T-2 概述
A buck (step-down) switching regulator is a power-management IC that converts a higher DC input voltage to a lower DC output voltage with high efficiency by rapidly switching an inductor. In the system hierarchy it sits within DC-DC converters -> voltage regulators -> power management ICs -> semiconductors. The A8586 family from Allegro is optimized for automotive and industrial point-of-load applications where high input voltage, compact PCB area, and high efficiency are mandatory.
Key features include integrated high-side MOSFET, current-mode control with simple external compensation, programmable switching frequency, internal soft-start, and cycle-by-cycle overcurrent protection. The -2 option disables PFM and dithering, providing a fixed-frequency PWM waveform that simplifies EMI filtering and minimizes output ripple for noise-sensitive loads such as analog sensors and audio front-ends.
The A8586 uses peak current-mode control with an internal compensation network that keeps the loop stable across a wide range of input voltages and output LC filter choices. The exposed pad (EP) on the SOIC-8 package provides a low thermal resistance path so the 3.5 A output can be sustained without an external heatsink at moderate duty cycles, while the wide 4 V to 40 V input range allows direct connection to 12 V and 24 V industrial and automotive buses.
Typical applications include automotive infotainment and instrument-cluster power, industrial 24 V sensor and actuator rails, point-of-load regulation from a 12 V or 24 V bus, PoL supplies for distributed DC-DC architectures, and general-purpose 5 V/3.3 V/1.8 V conversion in space-constrained boards. The device is AEC-Q100 qualified for automotive use when paired with the appropriate part suffix.
When designing with the A8586, follow Allegro's reference layout: place the input ceramic capacitor and bootstrap capacitor directly at the SW and VIN pins, keep the feedback trace away from the SW node, and use a 4-layer PCB with a continuous ground plane to maximize thermal dissipation through the exposed pad. Choose the inductor based on the programming of the switching frequency.
This page synthesizes distributor stock, drop-in alternative MPNs, and practical design notes not collected in any single manufacturer datasheet - a starting point for BOM qualification and second-source decisions.
直接替换替代料： A8586KLJTR-T-2 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： A8586KLJTR-T-2 （相同外形与封装尺寸） ——差异在于 Control Mode, Input Voltage Range, Output Voltage Range, Package, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
A8586KLJTR-T
✅ 直接替换✓ 有现货
$1.71 / 个
查看数据手册 →A8586-1
✅ 直接替换📋 参考替代料（不在目录中）
A8586KLJTR-T-2 最大额定值与电气特性
| 拓扑 | Buck (Step-Down) Switching Regulator |
| 输入电压范围 | 4 V to 40 V |
| 输出电压范围 | 0.8 V to VIN (Adjustable) |
| 最大输出电流 | 3.5 A |
| 输出数量 | 1 |
| 开关频率 | 100 kHz to 2 MHz (programmable) |
| PFM Mode | Disabled (variant -2 disables PFM and dithering) |
| Control Mode | Peak Current-Mode PWM |
| Integrated MOSFET | High-side N-channel MOSFET (integrated) |
| 工作温度范围 | -40 C to +150 C (junction) |
| 封装 | 8-SOIC with Exposed Pad (LJ-8) |
| 安装类型 | Surface Mount |
| MSL 等级 | 3 (per JEDEC J-STD-020) |
| RoHS 状态 | Compliant (lead-free) |
| Protection Features | Cycle-by-cycle OCP, thermal shutdown, soft-start |
A8586KLJTR-T-2 引脚配置
| 引脚 1 | BST — Bootstrap capacitor node for high-side gate drive |
| 引脚 2 | VIN — Input supply voltage (4 V to 40 V) |
| 引脚 3 | EN — Enable input (active high) |
| 引脚 4 | RT — Timing resistor to program switching frequency |
| 引脚 5 | COMP — External compensation network node |
| 引脚 6 | FB — Feedback input (set VOUT via resistor divider) |
| 引脚 7 | GND — Ground reference |
| 引脚 8 | SW — Switch node to external inductor |
| 引脚 9 | EP — Exposed pad - connect to GND for thermal dissipation |
典型应用
A8586KLJTR-T-2 适用于 6 应用s: Automotive 12V Point-of-Load Supply, Industrial 24V Sensor and Actuator Power, Distributed POL for 12V Bus Architectures, Battery-Powered Portable Equipment, General-Purpose 5V/3.3V/1.8V Conversion, Audio Front-End and Analog Sensor Bias.
Automotive 12V Point-of-Load Supply
The A8586KLJTR-T-2's 4V to 40V input range and 3.5A output current make it well-suited to automotive 12V bus point-of-load conversion. The wide input withstands load-dump transients up to 40V on the battery rail, while the integrated high-side MOSFET and exposed-pad SOIC-8 deliver 3.5A to microcontrollers, sensors, and CAN transceivers without a heatsink. The -2 variant's fixed-frequency PWM simplifies EMI filtering to meet CISPR 25 automotive radiated-emission limits. Estimated efficiency at VIN=12V, VOUT=3.3V, IOUT=2A approaches the mid-80s percent range per Allegro reference curves.
推荐
Industrial 24V Sensor and Actuator Power
The A8586KLJTR-T-2 accepts a 24V industrial supply rail directly without a pre-regulator, making it ideal for PLC sensor and actuator power conditioning. The adjustable 0.8V to VIN output covers the 5V, 3.3V, 2.5V, and 1.8V rails demanded by modern analog front-ends and 32-bit microcontrollers. The exposed-pad SOIC-8 package keeps the converter footprint under 30 square millimeters per Allegro reference design, while the -2 variant's disabled PFM prevents low-frequency interference with adjacent analog measurement circuits.
推荐
Distributed POL for 12V Bus Architectures
In distributed power architectures the A8586KLJTR-T-2 sits at each point-of-load downstream of a 12V intermediate bus, converting locally to 3.3V, 2.5V, or 1.8V for FPGA and ASIC core rails. The programmable 100kHz to 2MHz switching frequency allows the converter to be synchronized to a master clock or offset to spread spectrum for EMI mitigation. Cycle-by-cycle overcurrent and thermal shutdown protect the load when a downstream short occurs, while internal soft-start prevents inrush that would collapse the 12V rail.
推荐
Battery-Powered Portable Equipment
Battery-powered instruments benefit from the A8586KLJTR-T-2's wide 4V to 40V input that handles multi-cell Li-ion packs (up to 10S) as well as lead-acid 12V and 24V sources. The exposed-pad SOIC-8 keeps thermal resistance low so 3.5A is sustained without external heatsinking in handheld designs. The -2 suffix's disabled PFM trades a small amount of light-load efficiency for predictable frequency operation, which simplifies the EMI input filter. According to Allegro, the device draws a few milliamps quiescent, suitable for portable loads.
推荐
General-Purpose 5V/3.3V/1.8V Conversion
The A8586KLJTR-T-2 is a flexible general-purpose buck converter for any application needing 5V, 3.3V, or 1.8V from a higher-voltage DC source. Its 0.8V reference supports low-voltage rails for modern logic families, while the 3.5A rating covers most digital subsystems. The integrated high-side MOSFET eliminates an external switch, reducing BOM cost, and the external compensation network allows tuning for ceramic-only output capacitors per the Allegro reference design.
推荐
Audio Front-End and Analog Sensor Bias
The -2 suffix disables both PFM and dithering, making the A8586KLJTR-T-2 a low-noise choice for analog sensor bias and audio front-end power. With PWM fixed-frequency operation the switching harmonics stay predictable, simplifying the input EMI filter and reducing the chance of audible or sensor-channel interference. The exposed-pad SOIC-8 keeps the converter footprint small enough for inline placement near the analog ICs, while 3.5A capacity handles multi-channel microphone or op-amp biasing.
推荐
推荐产品汇总
工程参考数据： A8586KLJTR-T-2 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | A8586KLJTR-T | A8586-1 | A8586KEJTR-T |
|---|---|---|---|---|
| Brand | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems |
| Package | 8-SOIC with Exposed Pad (LJ-8) | 8-SOIC with Exposed Pad (LJ-8) - same | 8-SOIC with Exposed Pad (LJ-8) - same | DFN-10 - different land pattern |
| Input Voltage Range | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V |
| Output Current | 3.5 A | 3.5 A | 3.5 A | 3.5 A |
| Switching Frequency | 100 kHz to 2 MHz | 100 kHz to 2 MHz | 100 kHz to 2 MHz | 100 kHz to 2 MHz |
| PFM at Light Load | Disabled (-2 suffix) | Enabled (PFM for high light-load efficiency) | Disabled (PFM off, dithering on) | Enabled (PFM for high light-load efficiency) |
| Dithering | Disabled (-2 suffix) | Enabled | Enabled | Enabled |
关键差异点
- Disables PFM and dithering for predictable EMI spectrum （对比 A8586KLJTR-T)
- Same die and SOIC-8 LJ package as base A8586 （对比 A8586KLJTR-T)
- Wider 40V input withstand vs Allegro lower-voltage cousins （对比 Lower-voltage Allegro buck regulators)
设计说明
Estimated: at VIN=24V, VOUT=5V, IOUT=3.5A continuous, internal dissipation is (24-5)*3.5 = 66.5 W minus switching losses. The 8-SOIC with exposed pad has a typical theta_JA around 35 C/W on a 4-layer 1-oz PCB, so the junction rise above ambient at 2W loss is approximately 70 C - keep the exposed pad soldered to a 1-square-inch copper pour for sustained 3.5A operation. For higher dissipation, mount the device on a 2-oz copper pour or add thermal vias to an internal ground plane.
Place the input ceramic bypass capacitor (10 uF X7R minimum) within 2 mm of the VIN pin and GND exposed pad. Keep the SW trace short and wide to minimize ringing and EMI; route it on a top-layer polygon and avoid placing analog signal traces beneath it. The feedback divider (resistors from VOUT to FB) should connect directly at the output capacitor sense point, not at the load, to avoid DC error from PCB trace resistance.
Do not omit the bootstrap capacitor between BST and SW - the high-side gate drive requires it, and without it the regulator will not start or will operate with very high RDS(on) and rapid thermal shutdown. Avoid using an output capacitor with ESR below 5 milliohms without re-tuning the compensation network; Allegro's reference design assumes a specific output filter. The EN pin should not be left floating - tie it to VIN through a 100 kΩ resistor for default-on behavior.
The -2 variant's disabled PFM and dithering keeps switching frequency constant, simplifying EMI input filter design. For conducted EMI compliance, use a pi-filter (LC) on VIN with common-mode choke plus Y-capacitors to ground. To pass CISPR 25 radiated emissions in automotive applications, shield the inductor and SW trace with a small copper fence tied to ground. Spread-spectrum variants (no -2 suffix) reduce peak EMI but trade lowering FM efficiency at light load.
合规信息
RoHS compliant per Allegro product page. A8586 family is designed for automotive applications with -40 C to +150 C junction rating consistent with AEC-Q100 grade-1; specific KLJTR-T-2 sub-qualification should be confirmed with Allegro. Halogen-free and conflict-mineral status not stated in the verified data.
