LM76005RNPR - 60V 5A Sync Step-Down Converter | Texas Instruments
MPN： LM76005RNPR ✓ 啟用中LM76005RNPR 概覽
A buck (step-down) converter is a switched-mode DC-DC topology that efficiently reduces a higher input voltage to a lower regulated output voltage by periodically storing and releasing energy through an LC filter. The LM76005RNPR belongs to the buck converter family within the broader switch-mode power supply (SMPS) hierarchy, which itself sits under DC-DC converters and the power management IC category. Synchronous variants replace the external Schottky rectifier with an integrated low-side MOSFET, improving efficiency and shrinking board area versus asynchronous designs.
Key features include a wide 3.5 V to 60 V input range (with 65 V transient tolerance for automotive load-dump survival), 15 µA quiescent current in regulation, 95% efficiency at 400 kHz (12 V IN, 5 V OUT, 2 A), 92% PFM efficiency at 10 mA load, external clock synchronization, pin-selectable FPWM mode for low-EMI operation, and an adjustable soft-start of 6.3 ms default. Functional safety documentation is available for systems targeting ISO 26262 compliance.
The device uses peak-current-mode control with internal compensation, minimizing external component count. Internal MOSFETs are optimized for low RDS(on) across the load spectrum, enabling high efficiency at both light and full loads. A precision reference provides ±1% output voltage accuracy, and seamless PWM-to-PFM transitions extend battery life in always-on applications by dropping quiescent losses.
Typical applications include industrial 24 V rail conversion, automotive infotainment and ADAS power, factory automation PLC I/O, battery-powered e-mobility systems, point-of-load regulation downstream of a higher-voltage bus, and ruggedized field equipment. The wide input range makes it especially attractive for systems exposed to wide transients such as 24 V industrial busses and 12 V automotive rails.
When designing with this part, ensure the input capacitor is sized to absorb the worst-case load-step ripple while keeping loop bandwidth stable. The exposed pad must be soldered to a continuous ground plane with thermal vias to handle up to 5 A continuous loads.
This page synthesizes distributor pricing, drop-in alternative cross-references, and practical design notes not found in the manufacturer datasheet alone, supporting engineers making sourcing and second-source decisions.
直接替換替代品，適用於 LM76005RNPR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LM76005RNPR （相同外形與佔位） — 差異在於 Mounting Type, RoHS Status.
LM76005QRNPRQ1
✅ 直接替換📋 參考替代品（不在目錄中）
LM76003RNPR
✅ 直接替換📋 參考替代品（不在目錄中）
LM76002RNPR
✅ 直接替換📋 參考替代品（不在目錄中）
LM76003QRNPRQ1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM76005RNPR 最大額定值與電氣特性
| 拓撲 | Synchronous Buck (Step-Down) |
| 輸入電壓範圍 | 3.5 V to 60 V |
| Input Voltage Transient Tolerance | 65 V |
| 最大輸出電流 | 5 A |
| 輸出電壓範圍 | 1 V to 95% of VIN |
| Quiescent Current (Regulation) | 15 µA |
| 切換頻率 | Up to 2.2 MHz (typ. 400 kHz, adjustable) |
| Efficiency at 400 kHz (12 VIN, 5 VOUT, 2 A) | 95% |
| PFM Efficiency at 10 mA | 92% |
| Control Mode | Peak Current Mode |
| Light-Load Operation | Seamless PWM/PFM transition, pin-selectable FPWM |
| External Clock Sync | Yes |
| 軟啟動 | 6.3 ms default, adjustable |
| 封裝 | WQFN-30 (RNP) 4x6 mm with exposed pad |
| 安裝類型 | Surface Mount |
| 工作溫度範圍 | -40 °C to +125 °C |
| MSL 等級 | 2 |
| RoHS 狀態 | Compliant |
| Functional Safety | Documentation available (Functional Safety-Capable) |
LM76005RNPR 腳位配置
| 腳位 1 | AGND — Analog ground |
| 腳位 2 | FB — Feedback input to internal error amplifier |
| 腳位 3 | COMP — Compensation network node |
| 腳位 4 | RT/SYNC — Resistor timing / external clock sync |
| 腳位 5 | SS — Soft-start control |
| 腳位 6 | EN/UVLO — Enable and undervoltage lockout |
| 腳位 7 | PGOOD — Power-good indicator output |
| 腳位 8 | VIN — Input supply voltage |
| 腳位 9 | VIN — Input supply voltage |
| 腳位 10 | VIN — Input supply voltage |
| 腳位 11 | BST — Bootstrap supply for high-side gate driver |
| 腳位 12 | SW — Switch node (connected to internal LSFET and HSFET) |
| 腳位 13 | SW — Switch node |
| 腳位 14 | SW — Switch node |
| 腳位 15 | SW — Switch node |
| 腳位 16 | PGND — Power ground |
| 腳位 17 | PGND — Power ground |
| 腳位 18 | PGND — Power ground |
| 腳位 19 | PGND — Power ground |
| 腳位 20 | PGND — Power ground |
| 腳位 21 | PGND — Power ground |
| 腳位 22 | PGND — Power ground |
| 腳位 23 | PGND — Power ground |
| 腳位 24 | PGND — Power ground |
| 腳位 25 | PGND — Power ground |
| 腳位 26 | PGND — Power ground |
| 腳位 27 | PGND — Power ground |
| 腳位 28 | PGND — Power ground |
| 腳位 29 | NC — Not connected (per datasheet) |
| 腳位 30 | PGND — Power ground / exposed thermal pad |
典型應用
LM76005RNPR 適用於 6 應用s: Industrial 24 V Rail Conversion, Automotive Infotainment and ADAS Power, Factory Automation PLC I/O, Battery-Powered E-Mobility Systems, Point-of-Load (POL) Regulators, Ruggedized Field Equipment.
Industrial 24 V Rail Conversion
The LM76005RNPR is well-suited to 24 V industrial rail conversion because its 3.5 V to 60 V input range directly accepts nominal 24 V supplies while tolerating transients up to 65 V from inductive load switching. At 400 kHz switching with 12 V IN and 5 V OUT, efficiency reaches 95%, reducing heatsinking in sealed PLC and sensor housings. The 15 µA quiescent current in regulation extends battery life in remote telemetry units powered from 24 V industrial busses. Designers should size the input capacitor for the worst-case step-down ratio and ensure the exposed pad is soldered to a continuous ground plane with thermal vias to handle 5 A continuous loads.
推薦
Automotive Infotainment and ADAS Power
The LM76005RNPR's 65 V transient tolerance and wide 3.5 V to 60 V input survive automotive load-dump events on 12 V batteries, making it a strong candidate for infotainment head-unit rails and ADAS sensor power. For AEC-Q100-qualified systems, the LM76005QRNPRQ1 is the drop-in automotive equivalent, which simplifies ISO 26262 functional-safety documentation. The 95% efficiency at 400 kHz and seamless PWM-to-PFM transition minimize thermal rise in enclosed dashboards. Pin-selectable FPWM reduces EMI in noise-sensitive camera and radar modules, helping designers meet CISPR 25 Class 5 limits.
推薦
Factory Automation PLC I/O
PLC I/O subsystems require robust step-down conversion from 24 V field rails to logic-level voltages such as 5 V, 3.3 V, and 1.8 V for microcontrollers, isolators, and transceivers. The LM76005RNPR's 5 A output capability supports multi-rail point-of-load distribution with peak efficiency of 95% at 400 kHz, keeping internal cabinet temperatures low. Its peak-current-mode control provides excellent transient response to motor inrush events that share the 24 V bus. The external clock synchronization feature enables frequency coordination across multiple PLC channels to avoid beat-frequency EMI issues in dense factory cabinets.
推薦
Battery-Powered E-Mobility Systems
E-scooters, e-bikes, and light electric vehicles use 36 V to 48 V battery packs that require efficient step-down conversion to 12 V and 5 V rails for displays, controllers, and lighting. The LM76005RNPR accepts up to 60 V, covering 13S lithium packs with margin, and its 15 µA quiescent current in regulation extends standby time when the system is idle. PFM efficiency of 92% at 10 mA load preserves battery capacity during low-power sleep states typical of always-connected IoT mobility products. External clock sync helps align switching frequency with sensitive GPS or BLE SoCs that share the same PCB.
推薦
Point-of-Load (POL) Regulators
Downstream of a higher-voltage intermediate bus, the LM76005RNPR serves as a 5 A point-of-load regulator for FPGAs, ASICs, and high-current microcontrollers. Its 1 V to 95% of VIN output range covers common core voltages from 1.0 V to 3.3 V when fed from a 5 V or 12 V bus, and its 400 kHz default switching enables small LC filter components for compact POL placement. External clock sync to the system's master clock eliminates beat tones in mixed-signal designs. The exposed pad and WQFN-30 footprint support high-density layouts typical of processor power trees.
推薦
Ruggedized Field Equipment
Outdoor and field-deployed electronics such as utility metering, traffic controllers, and agricultural sensors face wide temperature swings and noisy 12 V to 48 V supply rails. The LM76005RNPR's -40 °C to +125 °C operating range, 65 V transient tolerance, and 15 µA quiescent current make it well-suited for solar-powered remote monitoring with intermittent load profiles. Functional-safety documentation aids compliance with utility-grade reliability standards, while the WQFN-30 package's exposed pad with thermal vias provides reliable heat extraction in enclosed IP-rated enclosures.
推薦
推薦產品摘要
工程參考資料，適用於 LM76005RNPR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LM76005QRNPRQ1 | LM76003RNPR | LM76002RNPR | LM76003QRNPRQ1 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | WQFN-30 (RNP) | WQFN-30 (RNP) - same | WQFN-30 (RNP) - same | WQFN-30 (RNP) - same | WQFN-30 (RNP) - 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 60 V | 3.5 V to 60 V |
| Maximum Output Current | 5 A | 5 A | 3.5 A | 2.5 A | 3.5 A |
| Quiescent Current | 15 µA | 15 µA | 15 µA | 15 µA | 15 µA |
| AEC-Q100 Qualified | No | Yes | No | No | Yes |
| Efficiency at 400 kHz (12 VIN, 5 VOUT, 2 A) | 95% | 95% | 95% | 95% | 95% |
| Functional Safety Capable | Yes | Yes | Yes | Yes | Yes |
主要差異化特點
- Wide 60 V input with 65 V transient tolerance (對比TPS54360)
- Pin-compatible 5A/3.5A/2.5A family (對比TPS54560B)
- Automotive-grade drop-in equivalent (對比LM76005QRNPRQ1)
設計說明
Estimated: at VIN=24 V, VOUT=5 V, IOUT=5 A, conduction loss across the internal MOSFETs plus switching losses typically dissipate 1.0 W to 1.5 W. With the WQFN-30 (RNP) package, the junction-to-ambient thermal resistance is dominated by PCB copper area on the exposed pad; per TI's datasheet, achieving theta_JA of approximately 35 C/W requires a 4-layer board with at least 1 square inch of copper tied to the thermal pad and 9 thermal vias.
Place the input ceramic bypass capacitor (typically 2.2 µF X7R) as close as possible to the VIN pins, with the PGND return connected to a continuous ground plane. The BOOT capacitor (typically 0.1 µF) must be located adjacent to the BST and SW pins. Minimize the SW node copper area to reduce EMI; use a small inductor and place output capacitors close to the inductor's load-side terminal. The exposed thermal pad must be soldered to a continuous PGND pour with multiple thermal vias for heat extraction.
Do not exceed 65 V on VIN even transiently; TI's load-dump tolerance assumes the standard ISO 7637-2 pulse, not indefinite overvoltage. Ensure the RT resistor sets the switching frequency within the 200 kHz to 2.2 MHz range; values outside this range can cause unstable operation. The SS capacitor controls startup inrush - leaving it open enables the internal 6.3 ms default, but external capacitors below 1 nF may produce sub-millisecond ramps that violate downstream load requirements.
Pin-selectable FPWM mode forces fixed-frequency operation at light loads, which avoids audible noise from PFM burst patterns and reduces low-frequency EMI harmonics at the cost of efficiency. For CISPR 25 Class 5 compliance in automotive designs, consider placing an input pi-filter (LC pi-network) close to the LM76005RNPR VIN pins, and route the SW node on an inner PCB layer surrounded by ground copper. Synchronizing to an external clock at a multiple of the AM radio band (e.g., 2.1 MHz) keeps switching harmonics away from sensitive RF bands.
合規資訊
RoHS compliant per TI product page. Industrial grade; for AEC-Q100 automotive, use LM76005QRNPRQ1. Halogen-free status not explicitly stated in the verified data.
