TPS7133QDR - 3.3V 500mA LDO with RESET | Texas Instruments
料号： TPS7133QDR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.94 | $94.00 |
| 500 | $0.79 | $395.00 |
| 1,000 | $0.68 | $680.00 |
TPS7133QDR 概述
An LDO regulator is a type of linear voltage regulator that maintains a stable output even when the input-output differential is very small. Unlike switching regulators, LDOs produce no switching noise, making them part of the broader power management IC (PMIC) family used to post-regulate noisy DC-DC rails and supply analog loads.
Key features include a very low dropout voltage of 47mV at 100mA load, low quiescent current of 285uA, 274uVrms output noise, and 54dB PSRR at 120Hz. The PMOS pass element replaces the conventional pnp transistor, achieving an order-of-magnitude reduction in dropout voltage and quiescent current over older LDO architectures. Protection features include over-current and over-temperature shutdown, and the device operates from -40C to +125C junction temperature with a maximum input of 10V.
The RESET output asserts low when the output falls out of regulation and includes a delay to allow processor power rails to stabilize, eliminating a separate supervisor IC in microcontroller systems.
Typical applications include battery-powered portable instruments, 3.3V microcontroller and DSP power supplies, and post-regulation of switching converter outputs where low noise and fast transient response matter.
Design tip: use a 0.1uF input bypass and at least a 10uF output capacitor with low ESR for stability, and keep the enable pin driven or tied high to avoid floating-pin leakage in always-on designs.
直接替换替代料： TPS7133QDR ——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：
TPS7133QDRG4
✅ 直接替换📋 参考替代料（不在目录中）
TPS7133QD
✅ 直接替换📋 参考替代料（不在目录中）
TPS7101QDR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS7148QDR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS7150QDR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS7333QD
⚡ 相同封装 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS7133QDR 最大额定值与电气特性
| 输出类型 | Fixed Positive |
| 输出电压 | 3.3 V |
| 最大输出电流 | 500 mA |
| Maximum Input Voltage | 10 V |
| 压差电压 | 47 mV at 100 mA |
| 静态电流 | 285 uA |
| 输出噪声 | 274 uVrms |
| PSRR | 54 dB at 120 Hz |
| 输出数量 | 1 |
| Protection Features | Over Current Protection, Over Temperature Protection |
| 使能引脚 | Yes |
| Reset Output | Yes, with delay |
| 工作温度 | -40C to +125C (Tj) |
| 封装 | SOIC-8 (D) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
TPS7133QDR 引脚配置
| 引脚 1 | IN — Input supply voltage (up to 10 V) |
| 引脚 2 | GND — Ground |
| 引脚 3 | EN — Enable input (active high; drive or tie high for always-on) |
| 引脚 4 | NC — No connect |
| 引脚 5 | RESET — Reset output with delay; asserts low when output out of regulation |
| 引脚 6 | NC — No connect |
| 引脚 7 | OUT — Regulated 3.3 V output |
| 引脚 8 | OUT — Regulated 3.3 V output |
典型应用
TPS7133QDR 适用于 6 应用s: Microcontroller and DSP Power Supply, Battery-Powered Portable Instruments, Post-Regulation of DC-DC Converters, Industrial Control and Automation, Analog Sensor Signal Chains, Test and Measurement Equipment.
Microcontroller and DSP Power Supply
The TPS7133QDR's fixed 3.3V, 500mA output directly powers microcontrollers, DSPs, and low-power FPGAs. Its 47mV dropout at 100mA allows regulation from a 3.6V lithium cell or a 5V bus with minimal headroom, while the integrated delayed RESET output eliminates a separate supervisor IC by holding the processor in reset until the rail is valid. With only 285uA quiescent current and over-temperature protection, it suits both always-on and duty-cycled embedded systems in SOIC-8.
推荐
Battery-Powered Portable Instruments
For battery-operated equipment, the TPS7133QDR's 285uA quiescent current and very low 47mV dropout maximize usable battery capacity. Operating from inputs up to 10V, it accepts multi-cell alkaline or single-cell lithium stacks and maintains regulation deep into discharge. The enable pin allows the system MCU to shut the rail down completely, and 274uVrms output noise keeps analog front ends in portable measurement instruments clean without post-filtering.
推荐
Post-Regulation of DC-DC Converters
When a switching converter supplies a shared rail, the TPS7133QDR cleans it for noise-sensitive loads. Its 54dB PSRR at 120Hz attenuates low-frequency ripple while the PMOS LDO adds no switching artifacts, yielding 274uVrms output noise for analog circuits, VCOs, and precision references. Pair it after a buck converter whose output sits slightly above 3.3V; the small headroom keeps power dissipation low in the 500mA-rated SOIC-8 package.
推荐
Industrial Control and Automation
Industrial controllers need reliable 3.3V logic rails with supervision. The TPS7133QDR operates from -40C to +125C junction temperature, meeting harsh cabinet environments, and its over-current and over-temperature protection survive faulted field wiring. The delayed RESET output guarantees microcontrollers boot cleanly after brownouts on 5V or 9V plant supplies, and the 10V maximum input tolerates unregulated wall-adapter supplies commonly found in industrial I/O modules.
推荐
Analog Sensor Signal Chains
Precision sensor interfaces benefit from the TPS7133QDR's 274uVrms noise and 54dB PSRR at 120Hz, which keep the analog supply clean for amplifiers and ADC references. The low dropout supports operation directly from a 3.6V Li-SOCl2 cell common in remote sensor nodes, and the 285uA quiescent current preserves long deployment life. Use a 10uF low-ESR output capacitor to maintain stability across the full -40C to +125C range.
推荐
Test and Measurement Equipment
Bench instruments and modular measurement boards use the TPS7133QDR to derive quiet 3.3V rails for clocking, logic, and analog sections. The enable pin supports software-controlled power sequencing of module sections, while the RESET function reports rail validity to a system controller. With 500mA capability and low output noise, it powers oscillators, level translators, and ADC front ends without adding jitter-inducing supply noise to measurement paths.
推荐
推荐产品汇总
工程参考数据： TPS7133QDR ——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 | TPS7133QDRG4 | TPS7101QDR | TPS7150QDR | TPS7333QD |
|---|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Voltage | 3.3 V fixed | 3.3 V fixed | Adjustable 1.2 V - 9.75 V | 5.0 V fixed | 3.3 V fixed |
| Output Current | 500 mA | 500 mA | 500 mA | 500 mA | 500 mA |
| Enable Pin | Yes | Yes | Yes | Yes | Yes |
| Reset Output | Yes, with delay | Yes, with delay | Yes, with delay | Yes, with delay | Yes, with delay |
关键差异点
- Integrated delayed RESET supervisor （对比 TPS7101QDR)
- PMOS architecture yields ultra-low quiescent current （对比 TPS7333QD)
- Only 47mV dropout at 100mA （对比 TPS7150QDR)
设计说明
Place a 0.1uF ceramic bypass capacitor within 5mm of the IN pin and a 10uF low-ESR capacitor at the OUT pin. The TPS71 family requires an output capacitor for stability; ceramic X7R dielectric is preferred. Keep the RESET pull-up resistor (10k to 100k ohm) close to the pin to avoid noise coupling into the open-drain supervisor node.
At maximum load of 500mA with a 5V input and 3.3V output, dissipation is 0.85W. The SOIC-8 (D) package theta_JA of roughly 97 C/W on a standard board would raise the junction about 82C - acceptable at 25C ambient but marginal at 70C ambient. Use a solid ground-plane copper pour under the device or lower the input voltage (e.g., post-regulate from a 3.6V buck) for high-temperature enclosures.
Do not exceed the 10V maximum input rating - unregulated wall adapters can exceed this on light load. Never leave the EN pin floating; tie it to IN for always-on operation. When substituting TPS7333QD (TPS73 family), the pinout and RESET delay differ from TPS71 - verify the datasheet pin map and RESET timing before swapping layouts.
The 274uVrms noise and 54dB PSRR figures assume the recommended output capacitor. For even lower noise on ADC reference rails, add an RC post-filter or ferrite bead; do not add large bulk capacitance beyond the datasheet-stable range without verifying phase margin on the bench with a load-step test.
合规信息
RoHS compliant per DigiKey and JLCPCB listings. Not AEC-Q100 qualified. REACH and halogen-free status not stated in verified data.
