LM46001PWPR - 60V 1A Synchronous Step-Down Converter | TI
料号： LM46001PWPR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.13 | $2.13 |
| 10 | $1.95 | $19.50 |
| 100 | $1.72 | $172.00 |
| 500 | $1.48 | $740.00 |
| 1,000 | $1.31 | $1,310.00 |
| 2,500 | $1.18 | $2,950.00 |
LM46001PWPR 概述
A buck (step-down) DC-DC converter is a switching regulator that uses an inductor to transfer energy from input to output at a lower voltage with high efficiency. Unlike linear regulators that dissipate (VIN - VOUT) × IOUT as heat, a buck converter PWM-switches the input and filters the result with an LC network, yielding efficiencies typically above 90 percent. The LM46001 family belongs to TI's SIMPLE SWITCHER portfolio and sits in the broader hierarchy of switching regulators -> DC-DC converters -> power management ICs -> semiconductors.
Key features include 24 µA quiescent current in regulation, high light-load efficiency via DCM and PFM modes, EN55022/CISPR 22 EMI compliance, integrated synchronous rectification, and adjustable switching frequency. A PGOOD flag, enable pin, and internal soft-start complete the feature set. The HTSSOP-16 (PWP) power package has a thermal pad that keeps junction temperature manageable at the 1 A output level.
The device uses peak-current-mode control for simple loop compensation, fast transient response, and cycle-by-cycle current limiting. Its wide 3.5 V to 60 V input range is achieved with internal 65 V tolerant switches, eliminating the need for external protection components in 24 V industrial or 48 V telecom rail systems.
Typical applications include industrial 24 V/48 V rails, automotive infotainment and body electronics, eMMC/SSD POL supplies, battery-powered portable equipment, and HVAC or factory-automation nodes. The 500 kHz default allows compact inductors and ceramic output capacitors.
When designing with this part, select an inductor with saturation current at least 30 percent above the peak switch current and place input ceramic bypass capacitors within 3 mm of the PVIN pins to minimize ringing and EMI.
This page synthesizes distributor pricing as of 2026-10-08, drop-in pin-compatible alternatives from the LM436xx and LM4600x families, and practical design notes not consolidated in the manufacturer datasheet.
直接替换替代料： LM46001PWPR ——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： LM46001PWPR （相同外形与封装尺寸） ——差异在于 EMI Compliance, Mounting Type, Output Voltage Range, Package.
快速对比工具——选择替代料号进行并排对比：
LM46002PWPR
✅ 直接替换📋 参考替代料（不在目录中）
LM46000PWPR
✅ 直接替换✓ 有现货
$1.24 / 个
查看数据手册 →LM43603PWPR
✅ 直接替换📋 参考替代料（不在目录中）
LM43602PWPR
✅ 直接替换📋 参考替代料（不在目录中）
LM43601PWPR
✅ 直接替换📋 参考替代料（不在目录中）
LM43600PWPR
✅ 直接替换📋 参考替代料（不在目录中）
LM46001PWPR 最大额定值与电气特性
| 拓扑 | Synchronous Buck (Step-Down) |
| 输入电压范围 | 3.5 V to 60 V |
| 输出电压范围 | 1 V to approximately 28 V (adjustable) |
| Output Current | 1 A continuous |
| 开关频率 | 200 kHz to 2.2 MHz (500 kHz default) |
| Quiescent Current (Regulation) | 24 µA |
| Control Mode | Peak current mode |
| Light-Load Behavior | DCM and PFM for high efficiency |
| Switching FETs | Integrated high-side and low-side MOSFETs |
| 效率 | >90% typical at moderate loads (per datasheet curves) |
| EMI Compliance | Meets EN55022 / CISPR 22 conducted emissions |
| 工作温度 | -40 °C to +125 °C |
| 封装 | HTSSOP-16 (PWP), 5.1 mm × 6.6 mm × 1.2 mm, 0.65 mm pitch |
| 安装类型 | Surface Mount (exposed thermal pad) |
| MSL 等级 | 2 (per JEDEC J-STD-020) |
| Lead-Free / RoHS | Yes / Compliant |
| Enable / Soft-Start / PGOOD | Yes / Yes / Yes |
LM46001PWPR 引脚配置
| 引脚 1 | BST — Bootstrap capacitor for high-side gate drive |
| 引脚 2 | VIN — Input supply voltage (3.5 V to 60 V) |
| 引脚 3 | VIN — Input supply voltage (3.5 V to 60 V) |
| 引脚 4 | EN — Enable input (active high, with internal pull-up) |
| 引脚 5 | RT — Frequency-setting resistor to GND |
| 引脚 6 | SS — Soft-start programming capacitor |
| 引脚 7 | FB — Voltage feedback (to external resistor divider) |
| 引脚 8 | COMP — Compensation network node |
| 引脚 9 | PGND — Power ground (low-side FET source) |
| 引脚 10 | SW — Switch node (external inductor connection) |
| 引脚 11 | SW — Switch node (external inductor connection) |
| 引脚 12 | PGOOD — Power-good open-drain output |
| 引脚 13 | AGND — Analog ground (return for FB and COMP) |
| 引脚 14 | PVIN — Power VIN for internal FETs (decouple locally) |
| 引脚 15 | PVIN — Power VIN for internal FETs (decouple locally) |
| 引脚 16 | PGND — Power ground (low-side FET source) / Thermal pad |
典型应用
LM46001PWPR 适用于 7 应用s: 24V Industrial Sensor Rails, Automotive Body Electronics, 48V Telecom / PoE Point-of-Load, eMMC / SSD Storage Power, Battery-Powered Portable Equipment, HVAC & Building Automation, Industrial IoT Gateways.
24V Industrial Sensor Rails
The LM46001PWPR's 3.5 V to 60 V input range lets it connect directly to 24 V factory-automation backplanes without pre-regulation. At VIN = 24 V and VOUT = 5 V at 1 A, the synchronous topology holds efficiency above 90 percent, while 24 µA quiescent current keeps standby power budgets low for PLC analog input modules. The HTSSOP-16 exposed thermal pad simplifies mounting on vertical DIN-rail PCBs where heatsinking is impractical.
推荐
Automotive Body Electronics
Automotive 12 V and 24 V battery rails benefit from the LM46001PWPR's wide VIN tolerance that absorbs load-dump transients up to 60 V. Its HTSSOP-16 footprint supports compact body-control modules powering LED drivers, mirror heaters, and sensor clusters. The 500 kHz switching frequency avoids the AM-band, and the part meets EN55022/CISPR 22 EMI limits with a small input filter - critical for body electronics that share wiring with radio receivers.
推荐
48V Telecom / PoE Point-of-Load
The LM46001PWPR steps 48 V telecom or PoE inputs down to 5 V or 3.3 V for downstream point-of-load converters in switches, routers, and small-cell base stations. The integrated high-side and low-side MOSFETs reduce BOM count and PCB area, while synchronous rectification eliminates the need for an external Schottky diode. Cycle-by-cycle current limiting and the PGOOD flag support hot-swap and OR-ing topologies common in telecom hardware.
推荐
eMMC / SSD Storage Power
Solid-state drives and embedded MMC storage need tightly regulated 3.3 V and 1.8 V rails from a 5 V or 12 V upstream bus. The LM46001PWPR's peak-current-mode control delivers fast transient response for sudden SSD write-load steps, while the 24 µA quiescent current preserves battery life in portable storage devices. Synchronous rectification and 500 kHz switching keep ripple below 30 mV pk-pk, well within eMMC tolerance.
推荐
Battery-Powered Portable Equipment
For portable test instruments, eMeters, and handheld industrial scanners powered from 4-cell Li-ion packs, the LM46001PWPR's 24 µA quiescent current extends standby life by an order of magnitude versus older linear regulators. The part operates across the full 6 V to 36 V battery range and switches at 500 kHz to keep magnetics small. DCM/PFM operation at light loads prevents audible inductor whine during idle periods.
推荐
HVAC & Building Automation
HVAC controllers and building-automation nodes typically run from 24 VAC rectified rails that swing between 18 V and 36 VDC. The LM46001PWPR operates over this range with margin to spare, providing 5 V and 3.3 V rails for MCUs, sensors, and relay drivers. EN55022/CISPR 22 EMI compliance reduces certification cost for products installed in noise-sensitive commercial environments.
推荐
Industrial IoT Gateways
Industrial IoT gateways aggregate sensor data over RS-485, CAN, and Ethernet backbones and frequently run from 24 V supplies. The LM46001PWPR steps the bus voltage down to 5 V and 3.3 V for the gateway MCU, Wi-Fi/BLE module, and Ethernet PHY. Wide VIN tolerance tolerates supply droops during motor inrush, while integrated synchronous MOSFETs keep the design footprint under 100 mm² - important for DIN-rail enclosures.
推荐
推荐产品汇总
工程参考数据： LM46001PWPR ——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 | LM46002PWPR | LM46000PWPR | LM43603PWPR | LM43602PWPR | LM43601PWPR | LM43600PWPR |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | HTSSOP-16 (PWP) | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same |
| Input Voltage Range | 3.5 V to 60 V | 3.5 V to 60 V | 3.5 V to 60 V | 3.5 V to 36 V | 3.5 V to 36 V | 3.5 V to 36 V | 3.5 V to 36 V |
| Output Current | 1 A | 2 A (+100%) | 0.5 A (-50%) | 3 A (+200%) | 2 A (+100%) | 1 A (same) | 0.5 A (-50%) |
| Switching Frequency | 200 kHz to 2.2 MHz (500 kHz default) | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz |
| Quiescent Current | 24 µA | 24 µA | 24 µA | 33 µA | 33 µA | 33 µA | 33 µA |
| Control Mode | Peak current mode | Peak current mode | Peak current mode | Peak current mode | Peak current mode | Peak current mode | Peak current mode |
| EMI Compliance | EN55022 / CISPR 22 | EN55022 / CISPR 22 | EN55022 / CISPR 22 | EN55022 / CISPR 22 | EN55022 / CISPR 22 | EN55022 / CISPR 22 | EN55022 / CISPR 22 |
关键差异点
- Widest input voltage range in the 1 A HTSSOP-16 class （对比 LM43601PWPR)
- Pin-compatible current scaling within the same footprint （对比 LM46000PWPR / LM46002PWPR)
- Lower quiescent current than the LM436xx family （对比 LM43602PWPR)
设计说明
Place the input ceramic capacitors (X7R, 1 µF or larger) within 3 mm of the PVIN pins and use wide, short traces to minimize switching-node ringing. The exposed thermal pad must be soldered to a copper pour of at least 1 square inch to keep junction temperature within the 125 °C limit at 1 A continuous load.
Estimated: at VIN = 24 V, VOUT = 5 V, IOUT = 1 A, efficiency ≈ 92 percent, internal power dissipation ≈ (VIN - VOUT) × IOUT × (1 - η) ≈ 1.7 W. The HTSSOP-16 (PWP) thermal pad has θJA ≈ 40 °C/W on a standard JEDEC 4-layer board, producing a junction temperature rise of ~68 °C above ambient - acceptable up to about 55 °C ambient. Reduce VIN or improve airflow for hotter environments.
Do not exceed 60 V on VIN, including transients - load-dump events on 24 V automotive rails can reach 35 V steady-state and higher spikes. Add a TVS or input pi-filter if the upstream supply is unregulated. Also, ensure the SS capacitor is present; omitting it produces large inrush currents that can trigger the cycle-by-cycle limit and appear as output voltage sag at startup.
Keep the SW node copper area minimal to reduce EMI and parasitic capacitance. Route the FB trace away from the SW and BST traces, and use a single-point ground connection between AGND and PGND placed near the output capacitor ground return. The TI LM46001 evaluation board layout is a useful reference for two-layer industrial designs.
To meet EN55022/CISPR 22 Class B conducted limits, add a small common-mode choke plus 2.2 µF Y-capacitor at the input. The 500 kHz default switching frequency leaves the AM broadcast band clean; if you adjust frequency above 1 MHz, verify radiated emissions with a near-field probe.
合规信息
RoHS and lead-free confirmed per TI product page. Standard LM46001PWPR is not AEC-Q100 qualified - choose LM46001QPWPTQ1 for automotive. Halogen-free status not stated in provided data.
