LMR36510ADDAR - 65V 1A Sync Buck Converter | Texas Instruments
料号： LMR36510ADDAR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.4 | $140.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $0.99 | $990.00 |
| 2,500 | $0.88 | $2,200.00 |
LMR36510ADDAR 概述
A buck converter (step-down switching regulator) is a type of DC-DC converter that uses PWM control with an inductor and capacitor to convert a higher DC voltage into a lower DC voltage with high efficiency. Unlike linear regulators, which dissipate excess voltage as heat, buck converters switch the input at high frequency (typically hundreds of kHz to a few MHz), filter the switched waveform through an LC network, and regulate the duty cycle to maintain a stable output. They belong to the broader hierarchy of voltage regulators -> power management ICs -> power management, and are essential whenever a system must derive multiple lower supply rails from a higher-voltage bus such as industrial 24 V, automotive 12 V/24 V, or distributed 48 V rails.
Key features include 26 uA quiescent current for light-load efficiency (ideal for battery-powered or always-on systems), 400 kHz default switching frequency, internal compensation, and a PGOOD indicator for power-rail sequencing. The HTSSOP-8 PowerPAD package offers low theta_JA for improved thermal performance in continuous 1 A operation. The LMR36510 also integrates cycle-by-cycle current limit, thermal shutdown, and UVLO protection, reducing external component count and BOM cost.
The LMR36510 is part of TI's pin-compatible SIMPLE SWITCHER family that includes the 2 A LMR36520 (same 65 V rating) and the 36 V LMR33610/LMR33620/LMR33630/LMR33640 (1 A/2 A/3 A/4 A), enabling designers to scale current across product families without changing PCB layout. This scalability simplifies multi-product platform designs and reduces time-to-market across industrial, automotive, and communications applications.
Typical applications include industrial 24 V/48 V sensor and actuator power, building automation, PLC I/O, security camera IR-LED and PoE rails, battery management, and aftermarket automotive electronics where wide input voltage tolerance is essential.
When designing with this part, place the input capacitor as close as possible to the PVIN and PGND pins and use a low-ESR ceramic bypass on the BOOT pin to guarantee proper high-side drive. A 22 uF or larger input capacitor is recommended for 24 V/48 V bus operation; verify inductor saturation current at the LMR36510's peak current limit.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone manufacturer datasheet.
直接替换替代料： LMR36510ADDAR ——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： LMR36510ADDAR （相同外形与封装尺寸） ——差异在于 Mounting Type, Operating Temperature Range, Package, Switching Frequency.
快速对比工具——选择替代料号进行并排对比：
LMR36520FADDAR
✅ 直接替换📋 参考替代料（不在目录中）
LMR36510ADDAR-Q1
✅ 直接替换📋 参考替代料（不在目录中）
LMR33610BDDAR
✅ 直接替换📋 参考替代料（不在目录中）
LMR33620BDDAR
✅ 直接替换📋 参考替代料（不在目录中）
LMR36510FADDAR
✅ 直接替换✓ 有现货
$0.61 / 个
查看数据手册 →LMR36510ADDCR
✅ 直接替换📋 参考替代料（不在目录中）
LMR36510ADDAR 最大额定值与电气特性
| 拓扑 | Synchronous Buck (Step-Down) |
| 输入电压范围 | 4.2 V to 65 V |
| 输出电压范围 | 1 V to VIN (adjustable) |
| 最大输出电流 | 1 A |
| 开关频率 | 400 kHz (typ) |
| Quiescent Current (Iq) | 26 uA (typ) |
| 效率 | Up to ~90%+ (load dependent) |
| 输出类型 | Adjustable (positive) |
| 输出数量 | 1 |
| Internal MOSFETs | Yes (high-side + low-side) |
| External Schottky Diode | Not required (synchronous) |
| 工作温度范围 | -40 C to +125 C (junction) |
| 封装 | 8-Pin PowerSOIC (DDA / SO PowerPAD), 3.90 mm body width |
| 安装类型 | Surface Mount |
| MSL 等级 | Level-2, 260 C, 1 year floor life |
| Protection Features | Cycle-by-cycle current limit, thermal shutdown, UVLO |
| Good Power Indicator (PGOOD) | Yes |
| Compliance | RoHS compliant per TI product page |
LMR36510ADDAR 引脚配置
| 引脚 1 | PGND — Power ground return for the internal low-side FET |
| 引脚 2 | VIN — Input supply voltage (4.2 V to 65 V) |
| 引脚 3 | EN — Enable input (active high); pull high to enable, low to shutdown |
| 引脚 4 | FB — Feedback input to internal error amplifier (1.0 V reference) |
| 引脚 5 | RT/SS — Frequency / soft-start setting resistor |
| 引脚 6 | PGOOD — Power-good open-drain output indicator |
| 引脚 7 | SW — Switch node - connect to output inductor |
| 引脚 8 | BST — Bootstrap for high-side gate drive; connect to SW via 0.1 uF cap |
典型应用
LMR36510ADDAR 适用于 6 应用s: Industrial 24V Sensor and Actuator Power, Building Automation and HVAC Control, Security Camera and IR-LED Power, PLC I/O and Field Transmitter Modules, Battery Management and Energy Storage, Aftermarket Automotive Electronics.
Industrial 24V Sensor and Actuator Power
The LMR36510ADDAR is a strong match for industrial 24 V sensor and actuator supplies because its 4.2 V to 65 V input range tolerates the worst-case 24 V bus including load-dump transients up to 60 V without requiring upstream TVS protection in most designs. At VIN = 24 V and VOUT = 5 V / 0.7 A, the synchronous topology delivers peak efficiency around 88-92%, keeping internal dissipation below ~2 W on the SO PowerPAD-8 PCB footprint. The 26 uA quiescent current keeps standby power low for always-on sensors and PLC I/O. PCB Layout uses a single 22 uF ceramic input cap, 22 uF output cap, and a small 15-22 uH inductor, fitting under 100 mm^2 - ideal for distributed sensor modules.
推荐
Building Automation and HVAC Control
The LMR36510ADDAR fits building automation and HVAC controllers powered from 24 VAC rectified buses or 48 V distribution rails because it covers the full 4.2 V-65 V input range and survives wide mains-derived variation. With VOUT set to 3.3 V or 5 V at 1 A, it powers the MCU, wireless module, and relay drivers from a single stage, eliminating the need for a pre-regulator. The 400 kHz switching frequency keeps EMI below EN 55011 / EN 55032 limits when basic input filtering is applied. Low 26 uA Iq enables Energy Star standby targets for thermostats and smart-building nodes, while the SO PowerPAD-8 package is small enough for in-wall box mounting.
推荐
Security Camera and IR-LED Power
The LMR36510ADDAR suits IP security camera designs where the camera is powered from PoE-derived 48 V or 24 VAC, because it accepts the full 48 V bus plus transient margin up to 65 V in a single stage. It delivers 1 A continuous, enough for the image sensor SoC plus an IR-LED driver and motorised lens. The synchronous topology avoids the inefficiency of a Schottky-based buck, keeping case temperature low in enclosed outdoor housings. According to TI's LMR36510 product page, the 400 kHz switching allows a 15 uH inductor and 22 uF ceramic output cap for a compact PCB under 100 mm^2, fitting inside PoE-powered camera enclosures.
推荐
PLC I/O and Field Transmitter Modules
The LMR36510ADDAR fits PLC analog and digital I/O modules because it handles 24 V industrial rails directly with 65 V surge headroom and delivers a regulated 5 V or 3.3 V rail at 1 A to the isolated transceiver, ADC, and MCU. The SO PowerPAD-8 footprint simplifies layout on densely populated PLC cards where multiple rails stack side-by-side. PGOOD output enables sequenced multi-rail startup. According to the LMR36510 datasheet, the cycle-by-cycle current limit and thermal shutdown provide robust protection against output short circuits typical in field wiring faults, critical for IEC 61131-2 PLC reliability.
推荐
Battery Management and Energy Storage
The LMR36510ADDAR supports battery management and energy-storage systems because its 4.2 V to 65 V input covers 12 V, 24 V, and 48 V battery stacks plus charging transients. At VOUT = 5 V / 1 A it powers the BMS MCU, balancing circuits, and isolated communications. Low 26 uA Iq is critical during storage or sleep mode where every microamp of quiescent drain reduces pack shelf life. The synchronous topology delivers >90% efficiency at moderate loads, minimising self-heating inside sealed battery enclosures. The SO PowerPAD-8 footprint is compatible with TI's wider SIMPLE SWITCHER family, enabling drop-in scalability from 1 A (LMR36510) to 4 A (LMR33640) for higher-power packs.
推荐
Aftermarket Automotive Electronics
The LMR36510ADDAR is well suited to aftermarket automotive accessories such as dashcams, GPS trackers, and telematics units that must operate directly from a 12 V or 24 V vehicle bus. With 65 V transient tolerance, it absorbs load-dump pulses defined in ISO 7637-2 without additional TVS in most 12 V systems. The 1 A output powers the main SoC, modem, and GNSS receiver simultaneously. Per the TI LMR36510 product page, the 26 uA Iq minimises quiescent drain on the battery when the vehicle is parked - critical for accessories that remain connected. Use the AEC-Q100 -Q1 variant for OEM-grade automotive designs.
推荐
推荐产品汇总
工程参考数据： LMR36510ADDAR ——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 | LMR36520FADDAR | LMR36510ADDAR-Q1 | LMR33610BDDAR | LMR33620BDDAR | LMR36510FADDAR |
|---|---|---|---|---|---|---|
| Package | 8-Pin PowerSOIC (DDA) SO PowerPAD | 8-Pin PowerSOIC (DDA) - same | 8-Pin PowerSOIC (DDA) - same | 8-Pin PowerSOIC (DDA) - same | 8-Pin PowerSOIC (DDA) - same | 8-Pin PowerSOIC (DDA) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 4.2 V to 65 V | 4.2 V to 65 V | 4.2 V to 65 V | 3.8 V to 36 V | 3.8 V to 36 V | 4.2 V to 65 V |
| Maximum Output Current | 1 A | 2 A | 1 A | 1 A | 2 A | 1 A |
| Switching Frequency | 400 kHz typ | 400 kHz typ | 400 kHz typ | 400 kHz typ | 400 kHz typ | 400 kHz typ |
| AEC-Q100 Automotive Grade | No (industrial grade) | No | Yes (AEC-Q100) | No | No | No |
| External Schottky Required | No (synchronous) | No | No | No | No | No |
| PGOOD Indicator | Yes | Yes | Yes | Yes | Yes | Yes |
关键差异点
- Wide 4.2 V to 65 V input range in SO PowerPAD-8 （对比 LMR33610BDDAR)
- Synchronous topology eliminates external Schottky （对比 Asynchronous TPS54360 (hypothetical))
- 26 uA ultra-low quiescent current （对比 LMR36520FADDAR (2A))
- Pin-compatible scalability across voltage and current （对比 LMR33620BDDAR (36V / 2A))
设计说明
Place the 0.1 uF + 4.7 uF ceramic input capacitors as close as possible to the VIN (pin 2) and PGND (pin 1) pads of the SO PowerPAD-8 footprint, using a single ground return via to minimise parasitic loop inductance. Per TI's LMR36510 datasheet layout guidelines, the exposed thermal pad (pin 9, bottom of IC) MUST be soldered to a top-side copper pour with at least 6 thermal vias to the ground plane; this reduces theta_JA significantly and is mandatory for sustained 1 A operation. Route the SW node (pin 7) on the top layer only, with no vias, and keep it short and narrow to limit ringing.
Estimated: At VIN = 24 V, VOUT = 5 V, IOUT = 1 A, conversion efficiency is ~88-90%, so power dissipation is approximately P_D = VIN * IOUT * (1 - eta) = 24 * 1 * 0.12 = ~2.9 W. With the SO PowerPAD-8 soldered to the recommended copper area (theta_JA ~ 50 C/W on a 2-oz 4-layer board), junction temperature rise above ambient is roughly 50 * 2.9 = 145 C above ambient, which exceeds the 125 C junction limit at high ambient. For continuous 24V-to-5V/1A operation, derate to 0.7 A or use larger copper / external airflow; this is an estimate from datasheet loss curves, not a guaranteed specification.
Do not exceed 65 V on VIN, including transients - on automotive 12 V / 24 V buses, add a 60-65 V TVS clamp upstream (e.g., SMBJ58CA) for load-dump protection beyond the LMR36510's rating. The BOOT capacitor (BST pin 8 to SW pin 7) is mandatory - a 0.1 uF X7R ceramic must be placed within 2 mm of the pins; without it, the high-side gate drive fails and the regulator cannot switch. Do not load the output above 1 A continuously without verifying thermal margin - the part has cycle-by-cycle current limit but not overtemperature foldback below thermal shutdown.
Keep the feedback divider (FB pin 4) trace away from the SW node (pin 7) and inductor to avoid noise injection. Use a 100 kohm / 24.9 kohm resistor pair for a 5.0 V output, or 100 kohm / 41.2 kohm for 3.3 V, with the top of the divider connected directly at the output capacitor. The RT/SS pin (pin 5) resistor sets switching frequency and soft-start time; connect to GND via a 100 kohm resistor for default 400 kHz operation. Keep analog ground and power ground separated at the schematic level and joined at a single point under the IC's exposed pad.
