TPS7133QDR - 3.3V 500mA LDO with RESET | Texas Instruments
MPN： TPS7133QDR ✓ 啟用中TPS7133QDR 概覽
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.
直接替換替代品，適用於 TPS7133QDR — 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。
TPS7133QDRG4
✅ 直接替換📋 參考替代品（不在目錄中）
TPS7133QD
✅ 直接替換📋 參考替代品（不在目錄中）
TPS7101QDR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TPS7148QDR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TPS7150QDR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TPS7333QD
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TPS7133QDR 最大額定值與電氣特性
| 輸出類型 | Fixed Positive |
| 輸出電壓 | 3.3 V |
| 最大輸出電流 | 500 mA |
| Maximum Input Voltage | 10 V |
| 壓降電壓 | 47 mV at 100 mA |
| 靜態電流 | 285 uA |
| 輸出雜訊 | 274 uVrms |
| PSRR | 54 dB at 120 Hz |
| 輸出數量 | 1 |
| Protection Features | Over Current Protection, Over Temperature Protection |
| 致能腳位 | Yes |
| Reset Output | Yes, with delay |
| 工作溫度 | -40C to +125C (Tj) |
| 封裝 | SOIC-8 (D) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
TPS7133QDR 腳位配置
| 腳位 1 | IN — Input supply voltage (up to 10 V) |
| 腳位 2 | GND — Ground |
| 腳位 3 | EN — Enable input (active high; drive or tie high for always-on) |
| 腳位 4 | NC — No connect |
| 腳位 5 | RESET — Reset output with delay; asserts low when output out of regulation |
| 腳位 6 | NC — No connect |
| 腳位 7 | OUT — Regulated 3.3 V output |
| 腳位 8 | OUT — Regulated 3.3 V output |
典型應用
TPS7133QDR 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 TPS7133QDR — 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 | 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 |
主要差異化特點
- Integrated delayed RESET supervisor (對比TPS7101QDR)
- PMOS architecture yields ultra-low quiescent current (對比TPS7333QD)
- Only 47mV dropout at 100mA (對比TPS7150QDR)
設計說明
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.
合規資訊
RoHS compliant per DigiKey and JLCPCB listings. Not AEC-Q100 qualified. REACH and halogen-free status not stated in verified data.
