TPS78533QWDRBRQ1 - 1A 3.3V Fixed LDO, AEC-Q100 | Texas Instruments
料号： TPS78533QWDRBRQ1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.57 | $25.70 |
| 100 | $2.28 | $228.00 |
| 500 | $2.04 | $1,020.00 |
| 1,000 | $1.82 | $1,820.00 |
TPS78533QWDRBRQ1 概述
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a constant output voltage even when the input voltage approaches the output voltage, defined by a small dropout voltage. Within the power management hierarchy, the LDO sits below switching converters and is used to post-regulate a noisy or higher-voltage rail into a clean, low-noise rail. Compared to a switching DC-DC converter, an LDO introduces no switching ripple but dissipates VIN minus VOUT as heat, making it ideal as a final stage in front of noise-sensitive analog and digital loads.
Key features of the TPS78533QWDRBRQ1 include the 30 uVrms output noise, 60 dB PSRR at 1 kHz, and only 35 uA of quiescent current - a strong combination for always-on automotive battery rails where sleep current matters. The integrated soft-start limits inrush during turn-on, and the output discharge FET actively pulls the rail down when the enable pin is de-asserted, eliminating residual charge on downstream loads. The SON-8 package with exposed thermal pad provides a low theta_JB for direct dissipation into the PCB copper.
The TPS785-Q1 architecture combines a precision bandgap reference with a low-impedance P-channel pass element. The wide 1.7 V to 6.0 V input range supports direct connection to a 3.3 V or 5 V system rail, while the 1 A continuous rating with 315 mV dropout at full load allows operation on rails as low as approximately 3.6 V while still delivering 3.3 V at the output. According to the TI product page, the device is qualified to AEC-Q100 Grade 1 (-40 C to +125 C ambient) and is targeted at automotive post-regulation use cases.
Typical applications include automotive infotainment and cluster power rails, ADAS sensor and camera modules, body electronics and lighting controllers, always-on battery-backed MCUs, industrial sensors and PLC analog front ends, and portable battery-powered equipment. In each of these, the LDO acts as a clean post-regulator following a higher-voltage or switching pre-regulator.
When designing with this part, verify that the maximum power dissipation (estimated: PD_max = (VIN_max - 3.3 V) x 1 A) stays within the thermal envelope of the SON-8 EP land pattern. A minimum 1 oz copper pour of approximately 1 cm^2 is recommended to keep junction temperature rise below 30 C at 5 V input and 1 A load.
This page synthesizes distributor stock data, AEC-Q100 drop-in alternatives within the TPS785 family, and practical layout notes - content not found on the standalone TI datasheet PDF.
直接替换替代料： TPS78533QWDRBRQ1 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
TPS78518QWDRBRQ1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS78525QWDRBRQ1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS78550QWDRBRQ1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS7A0233PWDRQ1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LP38691QSD-ADJ/NOPB
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TLV1117-33CDCYR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS78533QWDRBRQ1 最大额定值与电气特性
| Product Type | LDO Linear Voltage Regulator (Fixed Output) |
| 输出类型 | Fixed 3.3 V |
| 输出数量 | 1 |
| 输入电压范围 | 1.7 V to 6.0 V |
| 输出电压 | 3.3 V |
| 最大输出电流 | 1 A |
| 压差电压 | 315 mV at 1 A |
| 输出噪声 | 30 uVrms |
| PSRR | 60 dB at 1 kHz |
| 静态电流 | 35 uA typical |
| 使能引脚 | Yes |
| Output Discharge | Yes (internal FET) |
| 软启动 | Internal |
| 工作温度 | -40 C to +125 C (AEC-Q100 Grade 1) |
| 封装 | 8-SON (3 mm x 3 mm) with exposed pad, DRB suffix |
| 安装类型 | Surface Mount |
| Automotive Qualification | AEC-Q100 Grade 1 |
| Protection Features | Over-current, Thermal Shutdown, Input Under-Voltage Lockout |
| RoHS 状态 | Compliant |
| MSL 等级 | 2 (per JLCPCB listing) |
TPS78533QWDRBRQ1 引脚配置
| 引脚 1 | EN — Enable input (active high; drive high to enable regulator) |
| 引脚 2 | GND — Ground |
| 引脚 3 | IN — Input voltage supply (1.7 V to 6.0 V) |
| 引脚 4 | OUT — Regulated 3.3 V output |
| 引脚 5 | NC — Not connected (per datasheet) |
| 引脚 6 | NC — Not connected (per datasheet) |
| 引脚 7 | NC — Not connected (per datasheet) |
| 引脚 8 | NC — Not connected (per datasheet) |
典型应用
TPS78533QWDRBRQ1 适用于 6 应用s: Automotive Infotainment Power Rail, ADAS Camera Module Power, Body Electronics & Lighting Controller, Industrial Sensor & PLC Analog Front End, Always-On Battery-Backed MCU Rail, Portable & Battery-Powered Test Equipment.
Automotive Infotainment Power Rail
The TPS78533QWDRBRQ1 is a strong fit for automotive infotainment mainboard rails because it delivers 1 A continuous at a fixed 3.3 V from a 5 V automotive bus. The 30 uVrms output noise and 60 dB PSRR at 1 kHz keep audio DACs, Bluetooth transceivers, and display controllers free of switching ripple. The AEC-Q100 Grade 1 qualification and exposed-pad 8-SON package survive under-hood thermal stress while the internal soft-start prevents inrush on hot-plug events.
推荐
ADAS Camera Module Power
Camera modules for ADAS require clean, low-noise rails to maximize SNR of the image sensor and serializer. The TPS78533QWDRBRQ1's 30 uVrms output noise floor stays below the sensor's LSB resolution, while 60 dB PSRR rejects upstream switching noise from PoC or buck converters. Its 1 A capability supports image sensor + serializer + LED illuminator loads. The 8-SON EP footprint (3 mm x 3 mm) fits behind the small camera PCB, and the AEC-Q100 Grade 1 rating handles the automotive thermal envelope.
推荐
Body Electronics & Lighting Controller
Body control modules and LED drivers operate directly off the 12 V automotive bus and need a clean 3.3 V or 5 V rail for the MCU and logic. The TPS78533QWDRBRQ1 post-regulates from a 5 V pre-rail down to 3.3 V with 60 dB PSRR, eliminating conducted EMI from the LED driver stages. The 1 A rating supports MCU + LIN/CAN transceiver + small-signal relay drivers. AEC-Q100 Grade 1 plus the 35 uA Iq are key for low standby-drain BCM designs.
推荐
Industrial Sensor & PLC Analog Front End
PLC analog input modules and 4-20 mA sensor transmitters need low-noise rails for precision ADC operation. The TPS78533QWDRBRQ1's 30 uVrms noise and 60 dB PSRR translate directly into better ADC SNR; the 1 A rating supports multiple analog channels per rail. The wide 1.7-6.0 V input range lets the same part operate from a 24 V -> 5 V downstream buck or directly off a 3.3 V industrial rail. The exposed-pad 8-SON package dissipates cleanly into the PLC motherboard copper.
推荐
Always-On Battery-Backed MCU Rail
Always-on automotive MCUs and remote keyless entry modules draw microamp-range standby current to preserve battery life during parking. The TPS78533QWDRBRQ1's 35 uA quiescent current is acceptable for these duty cycles, and the enable pin lets the host power down the LDO during deep sleep. The output discharge FET ensures a deterministic 0 V at the MCU reset pin when disabled. The 1.7-6.0 V input range covers direct connection to a single Li-ion cell stack as well as 5 V automotive rails.
推荐
Portable & Battery-Powered Test Equipment
Handheld oscilloscope probes, portable DMMs, and field test gear require clean, compact rails from a Li-ion cell. The TPS78533QWDRBRQ1's 1 A output at 3.3 V powers MCUs, displays, and analog front ends; its 315 mV dropout at 1 A lets it run from a Li-ion cell down to approximately 3.6 V before the cell's protection circuit intervenes. The 8-SON EP package fits in the tight mechanical envelopes of handheld enclosures, and the integrated soft-start simplifies hot-insertion of battery packs.
推荐
推荐产品汇总
工程参考数据： TPS78533QWDRBRQ1 ——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 | TPS78518QWDRBRQ1 | TPS78525QWDRBRQ1 | TPS78550QWDRBRQ1 | TPS7A0233PWDRQ1 | LP38691QSD-ADJ/NOPB | TLV1117-33CDCYR |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SON (3x3, DRB) | 8-SON (3x3, DRB) - same | 8-SON (3x3, DRB) - same | 8-SON (3x3, DRB) - same | 8-SON (3x3) - same | 8-SON (3x3) - same | 8-SON (3x3) - same |
| Output Voltage | 3.3 V fixed | 1.8 V fixed | 2.5 V fixed | 5.0 V fixed | 3.3 V fixed | Adjustable (set with resistors) | 3.3 V fixed |
| Output Current | 1 A | 1 A | 1 A | 1 A | 200 mA | 1 A | 800 mA |
| Input Voltage Range | 1.7 V to 6.0 V | 1.7 V to 6.0 V | 1.7 V to 6.0 V | 1.7 V to 6.0 V | 1.4 V to 5.5 V | 2.7 V to 10 V | Up to 15 V |
| Automotive Qualification | AEC-Q100 Grade 1 | AEC-Q100 Grade 1 | AEC-Q100 Grade 1 | AEC-Q100 Grade 1 | AEC-Q100 | AEC-Q100 | Non-automotive grade |
关键差异点
- Smallest 1 A AEC-Q100 LDO in TPS785 family （对比 TPS78533QKVURQ1)
- 30 uVrms output noise floor for noise-sensitive analog rails （对比 TLV1117-33CDCYR)
- Integrated output discharge and soft-start （对比 TPS7A0233PWDRQ1)
设计说明
Estimated: at VIN = 5 V, VOUT = 3.3 V, and IOUT = 1 A, power dissipation is approximately (5 - 3.3) x 1 = 1.7 W. The 8-SON EP package has a low theta_JB thanks to the exposed thermal pad. To keep junction temperature rise below 30 C, use a minimum copper pour of approximately 1 cm^2 on the top layer with thermal vias to the opposite plane. Without thermal vias, the device can still operate at 1 A but with reduced margin at high ambient temperatures.
Place the input ceramic capacitor (1 uF to 10 uF X7R) within 2 mm of the IN pin and the output capacitor within 2 mm of the OUT pin. The exposed pad must be soldered to a continuous ground copper plane and connected via at least four thermal vias to the inner/outer ground pour. Avoid routing noisy switching nodes or high-current traces under the LDO's exposed pad to prevent ground bounce from coupling into the feedback path.
Do not exceed the maximum input voltage of 6.0 V - transients above this on the 5 V automotive rail can damage the internal pass element; add a TVS clamp if the design sees load-dump transients. The enable pin must not be left floating; tie to IN through a 10 kohm resistor if not actively driven. The output discharge FET pulls the rail down when EN is low - do not use this LDO if the downstream load requires a high-impedance off state.
合规信息
AEC-Q100 Grade 1 qualified per TI TPS785-Q1 product page. RoHS compliant. The -Q1 suffix and QDRBRQ1 package suffix denote automotive grade 1 and SON-8 EP packaging.
