LP5912Q1.1DRVRQ1 - 500mA 1.1V Automotive LDO | Texas Instruments
料号： LP5912Q1.1DRVRQ1 ✓ 量产中LP5912Q1.1DRVRQ1 概述
An LDO (low-dropout regulator) is a type of linear voltage regulator that maintains a stable output voltage even when the input voltage is only marginally higher than the output. Within the broader component taxonomy, the LP5912Q1.1DRVRQ1 sits in the LDO family, which itself is a subset of linear regulators, which falls under voltage regulators, the larger power management IC category. LDOs are preferred over switching regulators in noise-sensitive analog rails because they introduce no switching ripple.
Key features include 12 uVrms RMS output noise (without a noise bypass capacitor), 75 dB PSRR at 1 kHz, and an enable pin for power sequencing. The device supports remote output capacitance placement, allowing the output capacitor to sit near the load for improved transient response. Reverse current protection, soft-start, current limiting, and thermal shutdown are integrated to safeguard the device and downstream circuitry. Quiescent current is low, suiting always-on automotive subsystems.
The LP5912-Q1 uses TI's proprietary low-noise architecture to achieve noise performance comparable to LDOs that require external bypass capacitors, while saving board space and BOM cost. The WSON-6 package with an exposed thermal pad provides low theta_JA suitable for 500 mA continuous operation in compact PCB areas.
Typical applications include automotive camera modules, ADAS sensor power rails, infotainment RF/PLL supplies, and always-on microcontroller rails in body electronics and cluster instrumentation. The fixed 1.1 V output is well matched to low-voltage SoC core rails and to powering image sensors, RF transceivers, and precision analog front ends.
When designing with this part, place input and output ceramic capacitors (1 uF or larger, X7R/X5R) as close as possible to the IN and OUT pins. Although the device tolerates remote output capacitance, trace inductance between the output capacitor and the load must be kept low for optimal load-transient behavior.
This page synthesizes distributor pricing, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet.
直接替换替代料： LP5912Q1.1DRVRQ1 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
LP5912Q1.0DRVRQ1
✅ 直接替换📋 参考替代料（不在目录中）
LP5912Q1.2DRVRQ1
✅ 直接替换📋 参考替代料（不在目录中）
LP5912Q1.8DRVRQ1
✅ 直接替换📋 参考替代料（不在目录中）
LP5912Q1.3DRVRQ1
✅ 直接替换📋 参考替代料（不在目录中）
LP5912Q2.5DRVRQ1
✅ 直接替换📋 参考替代料（不在目录中）
LP5912Q1.1DRVRQ1 最大额定值与电气特性
| 输出类型 | Fixed |
| Fixed Output Voltage | 1.1 V |
| 最大输出电流 | 500 mA |
| 输入电压范围 | 1.6 V to 6.5 V |
| Output Noise (RMS, no bypass cap) | 12 uVrms |
| PSRR | 75 dB at 1 kHz |
| 使能引脚 | Yes |
| Reverse Current Protection | Yes |
| 工作温度 | -40C to +125C |
| 封装 | 6-WSON (DRV) 2x2 mm with exposed pad |
| 安装类型 | Surface Mount |
| Automotive Qualification | AEC-Q100 |
| Output Capacitor Requirement | 1 uF ceramic minimum; remote-capable |
LP5912Q1.1DRVRQ1 引脚配置
| 引脚 1 | EN — Enable input (active high); logic-high enables the regulator, logic-low disables it (output discharged by internal pull-down). |
| 引脚 2 | IN — Input supply voltage; connect 1 uF or larger X7R/X5R ceramic capacitor close to the pin. |
| 引脚 3 | GND — Ground reference for the regulator. |
| 引脚 4 | OUT — Regulated 1.1 V output; connect 1 uF or larger ceramic capacitor close to the pin (remote-capable per datasheet). |
| 引脚 5 | NC — Not connected (per datasheet); can be left floating or tied to GND on the PCB. |
| 引脚 6 | EP — Exposed thermal pad; must be soldered to a ground copper pour for rated thermal performance and current capability. |
典型应用
LP5912Q1.1DRVRQ1 适用于 6 应用s: Automotive Camera Module Power, ADAS Sensor Power Rail, Infotainment RF/PLL Supply, Always-On Microcontroller Rail, Body Electronics Cluster Instrument, Industrial IoT Sensor Node.
Automotive Camera Module Power
The LP5912Q1.1DRVRQ1 is well suited to power automotive camera image sensors and serializer ICs that require a low-noise 1.1 V rail. The 12 uVrms RMS noise (no bypass capacitor required) and 75 dB PSRR at 1 kHz prevent switching noise from upstream converters from coupling into the analog video path, which preserves the dynamic range of the imager. The 500 mA continuous output supports both single-sensor and multi-stream serializer designs. AEC-Q100 qualification to -40C to +125C ensures operation across automotive temperature grades. Remote output capacitance allows the output cap to sit at the load, improving transient response during image capture bursts.
推荐
ADAS Sensor Power Rail
The LP5912Q1.1DRVRQ1 provides a clean 1.1 V supply for ADAS radar and lidar sensor front ends where noise directly impacts detection range and false-alarm rate. With 12 uVrms RMS noise without a bypass capacitor and 75 dB PSRR at 1 kHz, the regulator suppresses ripple from upstream 5 V or 3.3 V switching rails. The 500 mA current capability supports the full sensor plus serializer power budget. AEC-Q100 qualification and reverse-current protection make it appropriate for safety-critical ADAS subsystems. The WSON-6 (2x2 mm) package fits the compact PCB form factor required behind bumper-mounted radar modules.
推荐
Infotainment RF/PLL Supply
The LP5912Q1.1DRVRQ1 is appropriate for powering GNSS, V2X, and infotainment RF transceiver PLLs and synthesizers that are extremely sensitive to supply noise. With 75 dB PSRR at 1 kHz and 12 uVrms RMS noise without a bypass capacitor, it eliminates the risk of phase-locked loop reference spurs caused by switching-regulator ripple. The fixed 1.1 V output matches common RF transceiver core rails. The AEC-Q100 grade supports deployment in telematics control units. Low quiescent current and an enable pin support power-sequenced RF chains that must wake and sleep independently to minimize quiescent draw on the battery.
推荐
Always-On Microcontroller Rail
The LP5912Q1.1DRVRQ1 powers always-on automotive microcontrollers in body and chassis ECUs that must remain active during key-off for functions like keyless-go, CAN wake-up, and security monitoring. Low quiescent current minimizes battery drain during parking, while the 500 mA peak capability supports wake-up surges. The fixed 1.1 V output is well matched to low-power SoC deep-sleep rails. The WSON-6 package fits dense ECU layouts, and the AEC-Q100 grade meets automotive reliability requirements. Reverse-current protection prevents back-feeding when the MCU rail collapses faster than the LDO output during a power-loss event.
推荐
Body Electronics Cluster Instrument
The LP5912Q1.1DRVRQ1 supplies instrument cluster display drivers and graphic controllers that demand low-noise analog rails for clean pixel drive. With 12 uVrms RMS output noise and 75 dB PSRR at 1 kHz, it ensures the display timing controller and backlight driver do not pick up switching noise that would otherwise produce visible artifacts. AEC-Q100 qualification is required for cluster electronics. The 500 mA capacity supports display controller plus touch and backlight housekeeping. Thermal shutdown and current limit protect the regulator during fault conditions, which is essential in safety-critical cluster modules.
推荐
Industrial IoT Sensor Node
The LP5912Q1.1DRVRQ1 powers low-power wireless sensor nodes in industrial monitoring and smart-building applications. Its 12 uVrms RMS output noise and 75 dB PSRR support precision analog front ends and 24-bit sigma-delta converters. The 500 mA output handles transmit surges from sub-GHz radios during TX bursts. Although AEC-Q100 is automotive, the part is widely used in industrial designs where its -40C to +125C rating and low quiescent current are advantageous. The WSON-6 package enables compact sensor node PCBs. The enable pin supports wake/sleep duty cycling to extend battery life.
推荐
推荐产品汇总
工程参考数据： LP5912Q1.1DRVRQ1 ——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 | LP5912Q1.0DRVRQ1 | LP5912Q1.2DRVRQ1 | LP5912Q1.8DRVRQ1 | LP5912Q1.3DRVRQ1 | LP5912Q2.5DRVRQ1 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 6-WSON (DRV) 2x2 mm | 6-WSON (DRV) 2x2 mm - same | 6-WSON (DRV) 2x2 mm - same | 6-WSON (DRV) 2x2 mm - same | 6-WSON (DRV) 2x2 mm - same | 6-WSON (DRV) 2x2 mm - same |
| Fixed Output Voltage | 1.1 V | 1.0 V | 1.2 V | 1.8 V | 1.3 V | 2.5 V |
| Maximum Output Current | 500 mA | 500 mA | 500 mA | 500 mA | 500 mA | 500 mA |
| Input Voltage Range | 1.6 V to 6.5 V | 1.6 V to 6.5 V | 1.6 V to 6.5 V | 1.6 V to 6.5 V | 1.6 V to 6.5 V | 1.6 V to 6.5 V |
| Output Noise (RMS, no bypass cap) | 12 uVrms | 12 uVrms | 12 uVrms | 12 uVrms | 12 uVrms | 12 uVrms |
| PSRR | 75 dB at 1 kHz | 75 dB at 1 kHz | 75 dB at 1 kHz | 75 dB at 1 kHz | 75 dB at 1 kHz | 75 dB at 1 kHz |
| Automotive Qualification | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 |
| Reverse Current Protection | Yes | Yes | Yes | Yes | Yes | Yes |
| Output Capacitor (minimum) | 1 uF ceramic | 1 uF ceramic | 1 uF ceramic | 1 uF ceramic | 1 uF ceramic | 1 uF ceramic |
| Approx. Unit Price (qty 1) | $1.09 | $1.09 (approx) | $1.09 (approx) | $1.09 (approx) | $1.09 (approx) | $1.09 (approx) |
关键差异点
- No noise bypass capacitor required （对比 TPS7A02 (different package, requires external BP cap))
- Remote output capacitance support （对比 Standard LDO with local-only output cap)
- Automotive-grade reverse current protection （对比 Industrial-grade LDOs without reverse blocking)
设计说明
Place the 1 uF (or larger) X7R/X5R ceramic input capacitor within 2 mm of the IN pin and the 1 uF output capacitor within 2 mm of the OUT pin. The exposed thermal pad (pin 6) MUST be soldered to a continuous ground copper pour that extends at least one via array to the internal ground plane. Per TI's LP5912-Q1 datasheet and application notes, inadequate thermal pad soldering is the most common cause of thermal shutdown events at 500 mA continuous load in compact layouts.
Estimated: at VIN = 5 V, VOUT = 1.1 V, IOUT = 500 mA, the LDO dissipates approximately (5 - 1.1) * 0.5 = 1.95 W. The WSON-6 DRV package has theta_JA on the order of 70 C/W on a 1-oz 4-layer PCB with a small ground pour; this yields a junction temperature rise of roughly 137 C above ambient. At 25 C ambient the junction is approximately 162 C, which approaches the 150 C thermal-shutdown limit. Designers targeting 500 mA at 5 V input must enlarge the copper pour to keep the junction below 125 C; TI's LP5912-Q1 EVM layout provides a reference footprint.
Do NOT add an external noise bypass capacitor (BP pin). The LP5912Q1.1DRVRQ1 achieves 12 uVrms without it, and adding a bypass cap on a TI-equipped architecture wastes PCB area and slows startup. Verify the output capacitor is rated for at least 6.3 V (preferably 10 V or 16 V) to withstand input transients up to 6.5 V and automotive load-dump events. Always assert EN after VIN is stable; pulling EN high before VIN can cause indeterminate startup behavior. The exposed pad must be tied to GND, not left floating, to achieve rated thermal performance.
合规信息
AEC-Q100 qualified per TI LP5912-Q1 product page. RoHS and REACH compliance per distributor listings. The 'Q1' suffix in TI part numbering explicitly denotes automotive-grade qualification including PPAP support.
