LDL212PUR - 1.2A Adjustable LDO, 18V Input, DFN-6 | STMicroelectronics
料号： LDL212PUR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.85 | $0.85 |
| 10 | $0.72 | $7.20 |
| 100 | $0.58 | $58.00 |
| 500 | $0.49 | $245.00 |
| 1,000 | $0.42 | $420.00 |
| 3,000 | $0.35 | $1,050.00 |
LDL212PUR 概述
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage approaches the output voltage closely, with the dropout voltage being the minimum VIN-VOUT differential required to keep the pass element in regulation. LDOs sit within the broader taxonomy of linear regulators, which in turn are a category of voltage regulators and a subset of power management ICs (PMICs). Unlike DC-DC switching regulators, LDOs do not switch the pass element, so they introduce no switching noise or EMI but dissipate (VIN - VOUT) x IOUT as heat.
Key specifications of the LDL212PUR include 87 dB PSRR at 120 Hz and more than 40 dB at 100 kHz, a low quiescent current suitable for always-on rails, and an operating junction temperature range of -40 C to +125 C. The device also tolerates input transients common in 12 V industrial bus systems and is offered in the thermally enhanced DFN-6 (3x3) with an exposed pad that keeps theta-JA low enough for full 1.2 A operation on a small PCB footprint.
Architecturally, the LDL212 uses a PNP pass transistor topology that achieves low dropout while keeping quiescent current modest, paired with a precision bandgap reference and an error amplifier trimmed for high loop gain. This combination yields the wide PSRR bandwidth required to reject ripple from upstream switching converters at both low audio frequencies and high RF switching harmonics.
Typical applications include post-regulation after a 12 V or 15 V switching converter in industrial automation, sensor and actuator power rails, battery-powered equipment that needs a clean auxiliary rail from a higher-voltage source, low-noise analog front-end supplies, point-of-load regulation for FPGAs, DSPs, and microcontrollers in 5 V and 3.3 V domains, and general-purpose 12 V-bus regulation.
When designing with the LDL212PUR, choose input and output capacitors per the datasheet ESR/ESL guidance to ensure loop stability, and verify that worst-case power dissipation (PD = (VIN_MAX - VOUT_MIN) x IOUT_MAX) stays below the package thermal rating given the PCB copper area. For multi-rail systems, the enable logic and soft-start behavior should be sequenced to match downstream load requirements.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single reference to compare parametric fits, plan thermal budgets, and select cross-brand equivalents for the LDL212PUR.
直接替换替代料： LDL212PUR ——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： LDL212PUR （相同外形与封装尺寸） ——差异在于 Output Type, PSRR at 100 kHz, Package, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
LDL212C-PUR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LDL212PU12R
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LDL212PU18R
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LDL212PU33R
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MCP1825S-1202E/DB
✅ 直接替换📋 参考替代料（不在目录中）
TLV1117LV33DCYR
✅ 直接替换📋 参考替代料（不在目录中）
LDL212PUR 最大额定值与电气特性
| 输出类型 | Adjustable |
| 输出电压范围 | 1.18 V to 17.4 V |
| 最大输出电流 | 1.2 A |
| 输入电压范围 | 2.5 V to 18 V |
| Typical Dropout Voltage | 350 mV at 1.2 A |
| PSRR at 120 Hz | 87 dB |
| PSRR at 100 kHz | > 40 dB |
| 工作结温 | -40 C to +125 C |
| 封装 | 6-DFN (3x3 mm) with exposed pad |
| 安装类型 | Surface Mount |
| 引脚数 | 6 |
| 拓扑 | PNP pass transistor LDO |
| Protection Features | Current limit, thermal shutdown |
| RoHS 状态 | Compliant |
LDL212PUR 引脚配置
| 引脚 1 | IN — Input voltage supply (2.5 V to 18 V) |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | EN — Enable input (active high) |
| 引脚 4 | ADJ — Adjustable feedback node for VOUT programming |
| 引脚 5 | NC — Not connected (per datasheet) |
| 引脚 6 | OUT — Regulated output voltage |
典型应用
LDL212PUR 适用于 6 应用s: 12 V Industrial Bus Post-Regulation, Audio CODEC and DAC Power Supply, FPGA / DSP Point-of-Load Regulation, Sensor and Actuator Power Rails, Battery-Powered Equipment Auxiliary Rails, Networking and Communication Equipment.
12 V Industrial Bus Post-Regulation
The LDL212PUR is a strong fit for 12 V industrial bus post-regulation thanks to its 2.5 V to 18 V input range and 1.2 A output capability, which directly covers the nominal 12 V and transient excursions seen on factory power rails. Its 87 dB PSRR at 120 Hz cleans up switching-converter ripple before it reaches sensitive analog stages such as sensor signal chains and ADC references. Placed between the 24 V or 12 V bus and a downstream 5 V or 3.3 V rail, the part eliminates an extra switching stage and reduces BOM cost. The DFN-6 (3x3) exposed pad keeps junction temperature manageable even at the 10 W+ dissipation levels that occur at high VIN-VOUT differentials.
推荐
Audio CODEC and DAC Power Supply
Audio CODECs and DACs demand exceptionally clean supplies because any noise on the power rail directly modulates the output signal. The LDL212PUR's 87 dB PSRR at 120 Hz and low-noise bandgap reference make it ideal as a post-regulator after a switching converter feeding audio analog rails. Delivering up to 1.2 A, it can supply both headphone amplifiers and the analog core of an audio CODEC from a single LDO. Place the part with a 1 uF ceramic input cap and a 2.2 uF to 10 uF low-ESR output cap as the datasheet specifies. Compared to a discrete reference plus op-amp regulator, the LDL212PUR cuts PCB area while still meeting audiophile-grade noise targets.
推荐
FPGA / DSP Point-of-Load Regulation
FPGAs and DSPs require dedicated point-of-load regulation to isolate sensitive analog and clocking supplies from digital switching noise. The LDL212PUR's 1.2 A capability covers core and auxiliary rails for small-to-medium FPGAs and DSPs in 5 V, 3.3 V, and 2.5 V domains. With 87 dB PSRR at low frequency, the part rejects ripple from upstream buck converters feeding multi-rail systems. The DFN-6 (3x3) footprint allows placement directly beneath or adjacent to the load, minimizing PCB trace impedance. For multi-rail designs, the LDL212PUR can be sequenced with enable-controlled switching regulators to enforce proper power-up order.
推荐
Sensor and Actuator Power Rails
Industrial sensors and actuators need stable, low-noise power to maintain measurement accuracy and prevent false triggering. The LDL212PUR's wide 2.5 V to 18 V input range allows direct operation from 24 V industrial rails with no upstream switching regulator, simplifying the BOM for distributed I/O modules. Its 1.2 A output handles multi-sensor clusters and small motor-control actuator drivers. The 87 dB PSRR eliminates conducted noise that could couple into analog sensor front-ends. With the -40 C to +125 C junction temperature range, the part survives harsh factory-floor thermal environments without derating beyond standard industrial margins.
推荐
Battery-Powered Equipment Auxiliary Rails
Battery-powered devices often require a clean auxiliary rail at a higher voltage than the battery provides for analog sections, gate drivers, or display backlights. The LDL212PUR's low quiescent current and 2.5 V minimum VIN let it run from a single-cell Li-Ion or multi-cell NiMH pack, generating a stable analog or driver rail. The 1.2 A capability supports moderate loads like LED backlight drivers and small motor predrivers. Compared to a charge pump, the LDO delivers lower noise and avoids switching EMI that could disturb RF receivers in the same enclosure. The exposed thermal pad maintains safe junction temperature even at high discharge currents.
推荐
Networking and Communication Equipment
Networking switches, routers, and base-station equipment run on 12 V or 48 V buses with multiple downstream rails for PHYs, FPGAs, and clock synthesizers. The LDL212PUR drops from these intermediate bus voltages to 5 V, 3.3 V, or 2.5 V with 87 dB PSRR, keeping switching-converter ripple out of PLL supplies and SerDes analog blocks. The 1.2 A output can power multiple PHY ICs or a small FPGA plus its support logic. The compact DFN-6 (3x3) enables dense placement on switch line cards where board real estate is at a premium. Combined with its -40 C to +125 C rating, the part meets telecom and industrial networking environmental specs.
推荐
推荐产品汇总
工程参考数据： LDL212PUR ——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 | LDL212C-PUR | LDL212PU12R | LDL212PU33R | MCP1825S-1202E/DB | TLV1117LV33DCYR |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | Microchip Technology | Texas Instruments |
| Package | 6-DFN (3x3) | 6-DFN (3x3) - same | 6-DFN (3x3) - same | 6-DFN (3x3) - same | 6-DFN (3x3) - same | 6-DFN (3x3) - same |
| Output Current | 1.2 A | 1.2 A | 1.2 A | 1.2 A | 0.5 A | 0.8 A |
| Output Voltage | Adjustable 1.18 V to 17.4 V | Fixed (variant-specific) | Fixed 1.2 V | Fixed 3.3 V | Fixed 1.2 V | Fixed 3.3 V |
| Operating Junction Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
关键差异点
- Wide 18 V input range in compact DFN-6 3x3 package （对比 MCP1825S-1202E/DB)
- High 1.2 A continuous output current in smallest DFN class （对比 TLV1117LV33DCYR)
- Adjustable output option across 1.18 V to 17.4 V （对比 LDL212PU33R)
设计说明
Estimated: at VIN = 12 V, VOUT = 3.3 V, IOUT = 1.2 A, the LDL212PUR dissipates approximately (12 - 3.3) x 1.2 = 10.4 W. With the DFN-6 (3x3) theta-JA of approximately 50 C/W on a 1 sq inch copper pour (per JEDEC EIA/JESD51 standards for similar DFN packages), junction temperature rises roughly 520 C above ambient, exceeding the 125 C rating. Either reduce IOUT, drop VIN via a pre-regulator, or expand copper area and add thermal vias to the exposed pad. For 5 V output from 12 V VIN, dissipation is roughly 8.4 W and demands 1.5+ sq inches of copper.
Per the ST LDL212 datasheet, place the input capacitor (1 uF ceramic minimum) and output capacitor (2.2 uF to 10 uF ceramic, low-ESR) within 2-3 mm of the IN and OUT pins to minimize loop inductance. The exposed thermal pad must be soldered to a copper plane with multiple thermal vias to a bottom-side ground plane for proper heat extraction. Keep high-current traces short and wide to reduce parasitic resistance that would otherwise degrade dropout performance.
Do not exceed the 18 V absolute maximum input voltage, even briefly, as transients above this rating can permanently damage the pass element. Verify output capacitor ESR is within the datasheet stability window - using only high-ESR tantalum or low-ESR ceramic outside the recommended range can cause oscillation. For adjustable variants, use 1% tolerance feedback resistors and place them close to the ADJ pin to minimize noise pickup and output voltage error.
合规信息
RoHS and REACH compliant per ST product page and DigiKey listing. Industrial-grade only (-40 C to +125 C); not AEC-Q100 qualified for automotive - choose automotive-grade pin-compatible parts if required.
