LM46001PWPT - 60V 1A Sync Step-Down Converter | Texas Instruments
料号： LM46001PWPT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.95 | $5.95 |
| 10 | $5.36 | $53.60 |
| 100 | $4.76 | $476.00 |
| 500 | $4.28 | $2,140.00 |
| 1,000 | $3.81 | $3,810.00 |
LM46001PWPT 概述
A buck (step-down) converter is a type of switching DC-DC regulator that reduces a higher input voltage to a lower, regulated output voltage by alternately storing energy in an inductor and releasing it into the load. Buck converters sit within the power management IC hierarchy (DC-DC converter -> switching regulator -> voltage regulator) and are the workhorse topology for any system that must derive a sub-rail from a higher bus. Synchronous implementations integrate both the high-side and low-side MOSFETs to maximize efficiency, especially at light loads, and to eliminate the need for an external Schottky diode.
The LM46001PWPT integrates 24 µA Iq in regulation, high efficiency at light load via DCM and PFM operation, EN55022/CISPR 22 EMI compliance, an adjustable switching frequency from 200 kHz to 2.2 MHz (500 kHz default), and internal synchronous rectification that removes the external Schottky. Peak-current-mode control simplifies loop compensation and provides cycle-by-cycle current limiting. The HTSSOP-16 (PWP) PowerPAD package keeps theta-JA low enough to dissipate 1A at 60V in industrial environments without a discrete heatsink.
The device is pin-to-pin compatible with the 0.5A LM46000 and 2A LM46002 in the same HTSSOP-16 footprint, giving designers a one-PCB layout that scales across load points. It is also AEC-Q100 qualified under the LM46001-Q1 part number for automotive 12V/24V systems.
Typical applications include industrial 24V/48V sensor rails, telecom point-of-load, automotive infotainment, eMeters, battery-powered equipment, and HVAC controllers. A 1 µF ceramic bypass on BP, plus inductor and output ceramic capacitor selection per WEBENCH, is sufficient for a complete 1A design.
When laying out the PCB, place the input ceramic, bootstrap capacitor, and output ceramic as close to the IC as possible and tie the PowerPAD to a continuous ground pour to achieve the datasheet thermal performance. For wide-Vin industrial rails, the 60V abs-max transient tolerance removes the need for upstream TVS in most 24V and 48V systems.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： LM46001PWPT ——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： LM46001PWPT （相同外形与封装尺寸） ——差异在于 EMI Compliance, MSL Level, Mounting Type, Output Voltage Range, Package.
快速对比工具——选择替代料号进行并排对比：
LM46001PWP
✅ 直接替换📋 参考替代料（不在目录中）
LM46001PWPR
✅ 直接替换✓ 有现货
$1.18 / 个
查看数据手册 →LM46001QPWPTQ1
✅ 直接替换📋 参考替代料（不在目录中）
LM46002PWPT
✅ 直接替换📋 参考替代料（不在目录中）
LM46000PWPT
✅ 直接替换📋 参考替代料（不在目录中）
LM46001PWPT 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 28 V (Adjustable) |
| 最大输出电流 | 1 A |
| Quiescent Current (Regulation) | 24 µA |
| Switching Frequency Range | 200 kHz to 2.2 MHz (500 kHz default) |
| Control Mode | Peak Current Mode |
| Light-Load Operation | DCM and PFM for high light-load efficiency |
| 同步整流 | Internal, integrated MOSFETs |
| EMI Compliance | EN55022 / CISPR 22 |
| 工作温度范围 | -40 °C to +125 °C |
| 封装 | 16-Pin HTSSOP (PWP) with PowerPAD |
| 安装类型 | Surface Mount |
| MSL 等级 | 2 (1 year floor life) |
| RoHS 状态 | Compliant |
LM46001PWPT 引脚配置
| 引脚 1 | PGND — Power ground (return for internal low-side FET and bootstrap diode) |
| 引脚 2 | VIN — Input supply voltage (3.5V to 60V) |
| 引脚 3 | EN — Enable (active high, with precision threshold) |
| 引脚 4 | PWRGD — Power-good open-drain output |
| 引脚 5 | RT — Resistor to GND programs switching frequency (200kHz to 2.2MHz) |
| 引脚 6 | SS/TR — Soft-start / tracking input |
| 引脚 7 | FB — Feedback (to VOUT resistor divider, internal 1.0V reference) |
| 引脚 8 | COMP — Compensation network node (error amplifier output) |
| 引脚 9 | BP — Internal 5V LDO bypass (1 µF ceramic to GND) |
| 引脚 10 | AGND — Analog ground (return for control circuitry) |
| 引脚 11 | SW — Switch node (to external inductor) |
| 引脚 12 | SW — Switch node (to external inductor, internally bonded to pin 11) |
| 引脚 13 | BST — Bootstrap (high-side gate drive supply, 0.1 µF to SW) |
| 引脚 14 | VIN — Input supply voltage (internally bonded to pin 2) |
| 引脚 15 | PGND — Power ground (internally bonded to pin 1) |
| 引脚 16 | PAD — Exposed PowerPAD thermal pad (must be soldered to ground pour) |
典型应用
LM46001PWPT 适用于 6 应用s: Industrial 24V Sensor Rails, Automotive 12V/24V Body Electronics, Telecom Point-of-Load Conversion, Battery-Powered eMeters and Field Sensors, HVAC and Building Automation Controllers, Portable Test and Measurement Equipment.
Industrial 24V Sensor Rails
The LM46001PWPT is ideally suited for industrial 24V sensor rails where its 3.5V-60V input range and 24 µA quiescent current in regulation deliver high efficiency even in idle conditions. At VIN=24V and VOUT=5V/1A the part achieves peak-current-mode control with simple loop compensation per the TI datasheet, and the EN55022/CISPR 22 EMI compliance simplifies factory automation certification. Designers can place the device directly on the 24V backplane without an upstream pre-regulator, and the HTSSOP-16 PowerPAD dissipates the resulting 19W of headroom loss at moderate duty without a heatsink in most enclosures.
推荐
Automotive 12V/24V Body Electronics
For automotive 12V/24V body electronics, the LM46001PWPT's automotive-grade counterpart (LM46001QPWPTQ1) is AEC-Q100 qualified and pin-compatible in the same HTSSOP-16 footprint. The 60V abs-max input range absorbs 24V truck load-dump transients without external TVS protection, and the 24 µA Iq supports always-on body controllers that must wake from CAN while drawing microamps. Synchronous rectification removes the need for an external Schottky diode, reducing BOM cost and PCB area for infotainment, instrument cluster, and ADAS sensor power rails.
推荐
Telecom Point-of-Load Conversion
The LM46001PWPT fits telecom 36-72V point-of-load conversion when a front-end clamp or hold-up circuit limits the rail to 60V. Its adjustable 200 kHz to 2.2 MHz switching frequency allows the designer to choose 500 kHz to optimize efficiency versus inductor size, or push to 2.2 MHz to shrink the output filter. Synchronous rectification and integrated MOSFETs achieve efficiency above 90% at 24V-to-5V/1A, while peak-current-mode control simplifies the compensation network and meets the fast transient response required by downstream ASICs and FPGAs in central-office line cards.
推荐
Battery-Powered eMeters and Field Sensors
Battery-powered eMeters and remote field sensors benefit from the LM46001PWPT's 24 µA quiescent current in regulation, which preserves charge during long sleep intervals. The wide 3.5V-60V Vin range accepts solar-charged 12V battery stacks, and the synchronous topology extracts the maximum usable energy at low output current. The HTSSOP-16 PowerPAD provides a small footprint for meter-sized PCBs, and the integrated synchronous MOSFETs remove the external Schottky that would otherwise leak in standby, further extending battery life in unattended deployments.
推荐
HVAC and Building Automation Controllers
The LM46001PWPT is well matched to HVAC and building automation controllers that operate from rectified 24VAC sources with wide DC variation. Its 60V abs-max Vin tolerates the rectified 24VAC peak of 34V plus transient margin without a TVS, and the adjustable 1V-28V output covers 3.3V logic, 5V relays, and 12V actuators from a single device. EN55022/CISPR 22 EMI compliance simplifies CE marking for European HVAC equipment, while the internal synchronous rectification removes the need for an external Schottky diode that would otherwise complicate the BOM.
推荐
Portable Test and Measurement Equipment
Portable test and measurement instruments use the LM46001PWPT to derive sub-rails from multi-cell Li-ion battery packs up to 60V (12S configurations). Its peak-current-mode control provides the fast transient response required by precision ADCs and DACs in handheld oscilloscopes and bench multimeters, while the 24 µA Iq preserves battery life when the instrument is in standby. The HTSSOP-16 footprint plus integrated synchronous FETs keep the converter area small enough to fit into slim handheld enclosures used by field service technicians.
推荐
推荐产品汇总
工程参考数据： LM46001PWPT ——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 | LM46001PWP | LM46001PWPR | LM46001QPWPTQ1 | LM46002PWPT | LM46000PWPT |
|---|---|---|---|---|---|---|
| Package | 16-Pin HTSSOP (PWP) with PowerPAD | 16-Pin HTSSOP (PWP) - same | 16-Pin HTSSOP (PWP) - same | 16-Pin HTSSOP (PWP) - same | 16-Pin HTSSOP (PWP) - same | 16-Pin HTSSOP (PWP) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| 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 60 V | 3.5 V to 60 V | 3.5 V to 60 V |
| Output Voltage Range | 1 V to 28 V (Adjustable) | 1 V to 28 V | 1 V to 28 V | 1 V to 28 V | 1 V to 28 V | 1 V to 28 V |
| Output Current | 1 A | 1 A | 1 A | 1 A | 2 A | 0.5 A |
| Quiescent Current | 24 µA | 24 µA | 24 µA | 24 µA | 27 µA | 24 µA |
| Switching Frequency Range | 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 |
| AEC-Q100 Automotive Qualified | No | No | No | Yes | No | No |
关键差异点
- Pin-compatible scaling across 0.5A/1A/2A in the same HTSSOP-16 footprint （对比 LM46000 (0.5A) and LM46002 (2A))
- Industry-leading 24 µA quiescent current at 60V input （对比 LM46002PWPT)
- AEC-Q100 automotive grade option in the same footprint （对比 LM46001QPWPTQ1)
设计说明
Estimated: Place the input ceramic bypass (CIN) within 5 mm of the VIN pins, the bootstrap capacitor (CBST = 0.1 µF) directly between BST and SW, and the BP bypass (CBP = 1 µF) within 2 mm of the BP pin. Keep the SW trace short and on the top layer to minimize ringing. The PowerPAD must be soldered to a continuous ground pour with at least 8 thermal vias (0.3 mm drill) to the inner ground plane to achieve the datasheet theta-JA, otherwise thermal performance will degrade significantly above 0.5A at high Vin.
Estimated: At VIN=24V, VOUT=5V, and 1A load, the device dissipates approximately 19W. The HTSSOP-16 PowerPAD package has a theta-JA around 40 °C/W on a standard 4-layer JEDEC test board (per typical TI PWP-package datasheet values), giving a junction temperature rise of ~36 °C above ambient. Without a sufficient ground pour, junction temperature can rise to 125 °C at 70 °C ambient, so verify with a thermal probe in high-temperature enclosures. The PowerPAD ground pour should be at least 100 mm² of 1 oz copper to stay within safe operating limits at maximum load.
Do not exceed the 60V abs-max on VIN; even short load-dump transients above 65V will permanently damage the device. Always use a 1 µF X7R ceramic on BP to keep the internal 5V LDO stable - omitting BP causes the internal gate drive to malfunction. For low-ESR ceramic output capacitors, add a 20-30 mΩ ESR element (e.g., a small series resistor or use COUT with the proper X7R dielectric profile) to avoid loop instability, since peak-current-mode control requires a minimum output ESR for clean PWM operation. Do not use the LM46001 below 1V output without adjusting the feedback network above the 1.0V internal reference.
To meet EN55022/CISPR 22 Class B, use a small pi-filter (L-C-L) on the input with a 1 µF X7R ceramic close to the IC. The integrated synchronous FETs already minimize switching ringing, but a 2-4 layer PCB with a continuous ground plane under the switch node further reduces radiated emissions. Place the RT resistor close to the RT pin to avoid noise injection that could modulate the switching frequency and create additional EMI spurs near the fundamental switching frequency.
合规信息
RoHS and REACH compliant per TI product page. LM46001PWPT is the standard industrial/commercial grade; the AEC-Q100 qualified automotive variant is LM46001QPWPTQ1, which shares the same datasheet family.
