TPS73501DRBR - 500mA Low-IQ High-PSRR LDO | Texas Instruments
MPN： TPS73501DRBR ✓ 啟用中TPS73501DRBR 概覽
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. It is a subclass of linear regulators that use a pass transistor operating in its linear region to drop excess voltage. LDOs are essential power management ICs providing clean, low-noise supply rails to sensitive analog and digital circuits within a broader power management architecture.
Key features include a low quiescent current of 45 uA (typical), high PSRR of 68 dB at 1 kHz, and low output noise. The enable pin allows power sequencing and shutdown to reduce power consumption. Overcurrent and thermal shutdown protection ensure robust operation in demanding environments.
The TPS73501DRBR uses a CMOS process technology, contributing to low quiescent current and high efficiency at light loads. The adjustable output is set with an external resistor divider, providing design flexibility. The VSON package with an exposed thermal pad enhances heat dissipation, allowing the regulator to deliver up to 500 mA with proper PCB layout. Fast start-up and excellent line and load transient response round out the AC performance.
Typical applications include powering microcontrollers, sensors, and RF transceivers in battery-operated devices, as well as providing clean supply rails for audio and precision analog circuits. The low dropout voltage of 0.5 V at 500 mA ensures efficient operation even with small input-to-output voltage differences.
When designing with this device, ensure adequate input and output capacitance (typically 1 uF) placed close to the pins. The enable pin can be tied to VIN if not used. For optimal noise performance, a noise bypass capacitor can be added to the NR pin.
直接替換替代品，適用於 TPS73501DRBR — 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。
此系列的變體
與下列產品可直接替換的同系列型號： TPS73501DRBR （相同外形與佔位） — 差異在於 Output Type, Package.
TPS73501QDRBRQ1
✅ 直接替換聯絡詢價
查看資料表 →TPS73601DRBR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TPS73533DRBR
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TPS73525DRBRG4
⚡ 相同封裝📋 參考替代品（不在目錄中）
TPS73633DRBRG4
⚡ 相同封裝📋 參考替代品（不在目錄中）
TPS73501DRBR 最大額定值與電氣特性
| 輸出類型 | Adjustable |
| 輸出電壓範圍 | 1.25 V to 6 V |
| 最大輸出電流 | 500 mA |
| 輸入電壓範圍 | 2.7 V to 6.5 V |
| 靜態電流 | 45 uA |
| PSRR | 68 dB at 1 kHz |
| 壓降電壓 | 0.5 V at 500 mA |
| 致能腳位 | Yes |
| Protection Features | Overcurrent, Thermal Shutdown |
| 工作溫度 | -40C to +125C |
| 封裝 | 8-SON (DRB) 3x3 mm |
| 安裝類型 | Surface Mount |
| Process Technology | CMOS |
| 輸出雜訊 | Ultra-low noise (NR pin bypass capacitor supported) |
| Transient Response | Fast line and load transient response |
| Fixed Output Versions | 1.2 V to 4.3 V available in family |
TPS73501DRBR 腳位配置
| 腳位 1 | EN — Enable input, active high; tie to VIN if unused |
| 腳位 2 | NR — Noise reduction / soft-start bypass capacitor pin |
| 腳位 3 | GND — Ground |
| 腳位 4 | FB/ADJ — Feedback pin for adjustable output, connect to resistor divider |
| 腳位 5 | OUT — Regulated output voltage |
| 腳位 6 | OUT — Regulated output voltage (connected) |
| 腳位 7 | IN — Input supply, 2.7 V to 6.5 V |
| 腳位 8 | IN — Input supply (connected) |
| 腳位 PAD | Thermal Pad — Exposed pad, connect to GND for heat dissipation |
典型應用
TPS73501DRBR 適用於 6 應用s: Battery-Powered Portable Devices, RF Transceiver Power Supply, Precision Analog and Sensor Rails, Industrial Control Systems, Audio Signal Chains, Automotive Subsystem Power.
Battery-Powered Portable Devices
The TPS73501DRBR fits battery-powered products because its 45 uA quiescent current minimizes standby drain, directly extending battery life, while the enable pin allows the system MCU to gate the rail entirely. Operating from 2.7 V input, it supports single-cell Li-Ion designs down to end-of-discharge voltage. Placed between the battery and a 1.8 V to 3.3 V sensor or MCU rail with 1 uF ceramics, it adds no switching noise and its 500 mA capability covers radio transmit bursts, a quantified benefit over lower-current LDOs in wearables and IoT nodes.
推薦
RF Transceiver Power Supply
With 68 dB PSRR at 1 kHz and ultra-low output noise, the TPS73501DRBR is well suited to powering RF transceivers and synthesizers where supply ripple converts directly to phase noise. In a typical topology, a switching regulator first steps down the battery, and the TPS73501 cleans the rail feeding the transceiver VCO/PLL pin, with a noise-bypass capacitor on the NR pin further narrowing the noise bandwidth. The high PSRR attenuates switching ripple by roughly three orders of magnitude, protecting receiver sensitivity in IoT, Zigbee, and sub-GHz radio designs.
推薦
Precision Analog and Sensor Rails
Precision ADCs, operational amplifiers, and sensors demand supply rails with low noise and stable output under load steps. The TPS73501DRBR delivers ultra-low output noise and excellent line/load transient response, so an ADC reference-supply or op-amp rail stays clean even when adjacent digital loads switch. Its adjustable output from 1.25 V to 6 V lets designers optimize ADC supply headroom for noise versus power. Adding a 10 nF NR capacitor suppresses noise further, and the exposed thermal pad of the DRB package keeps thermal drift minimal for measurement accuracy.
推薦
Industrial Control Systems
In industrial environments with -40C to +125C ambient demands, the TPS73501DRBR supplies clean point-of-load power for MCUs, communication transceivers, and analog front ends. Its 68 dB PSRR rejects ripple from factory-floor switching supplies, while overcurrent and thermal shutdown protection tolerate fault conditions. The 3x3 mm DRB package fits dense control boards, and the automotive-qualified TPS73501QDRBRQ1 variant enables reuse of the same footprint in harsher, certified systems. Dropout of 0.5 V at 500 mA allows efficient post-regulation from a 5 V industrial rail.
推薦
Audio Signal Chains
Audio DACs, headphone amplifiers, and microphone preamps benefit from the TPS73501DRBR's ultra-low output noise and high PSRR, since supply noise couples directly into the audio path and degrades signal-to-noise ratio. The part typically sits after a boost or buck converter powering a portable audio player, feeding the analog supply pin of the codec. With 68 dB ripple rejection and the NR pin noise-bypass feature, the resulting rail noise stays below audible thresholds, and the 500 mA rating covers speaker-amplifier quiescent and peak demands in compact designs.
推薦
Automotive Subsystem Power
For automotive electronics requiring AEC-Q100 components, the pin-compatible TPS73501QDRBRQ1 variant shares the identical DRB package, enabling the same PCB footprint across consumer and automotive builds. Typical uses include powering ADAS sensors, body-control MCU rails, and infotainment analog sections from regulated 3.3 V or 5 V distribution. The wide -40C to +125C temperature range and robust protection circuits address under-hood and cabin conditions, while the low 45 uA quiescent current supports keep-alive rails where quiescent drain is limited by battery-saver specifications.
推薦
推薦產品摘要
工程參考資料，適用於 TPS73501DRBR — 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 | TPS73501QDRBRQ1 | TPS73601DRBR | TPS73533DRBR |
|---|---|---|---|---|
| Package | 8-SON (DRB) 3x3 mm | 8-SON (DRB) 3x3 mm - same | 8-SON (DRB) 3x3 mm - same | 8-SON (DRB) 3x3 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Current | 500 mA | 500 mA | 400 mA | 500 mA |
| Output Type | Adjustable 1.25 V to 6 V | Adjustable 1.25 V to 6 V | Adjustable | Fixed 3.3 V |
| Input Voltage Range | 2.7 V to 6.5 V | 2.7 V to 6.5 V | 1.7 V to 5.5 V | 2.7 V to 6.5 V |
| Quiescent Current | 45 uA | 45 uA | 1 uA (ground current, cap-free) | 45 uA |
| Automotive Grade (AEC-Q100) | No | Yes (Q1) | No | No |
主要差異化特點
- Ultra-low 45 uA quiescent current (對比TPS73601DRBR)
- 68 dB PSRR for noisy upstream rails (對比TPS73533DRBR)
- Automotive drop-in upgrade path (對比TPS73501QDRBRQ1)
設計說明
Place the 1 uF input and output ceramic capacitors as close to the IN and OUT pins as possible, with short, wide traces to the exposed thermal pad (PAD) connected to a solid ground plane. The DRB 8-SON 3x3 mm package relies on the thermal pad for both grounding and heat dissipation; without adequate via stitching (4-6 vias to the ground plane), thermal performance and load transient response degrade at 500 mA.
Set the adjustable output with a resistor divider from OUT to FB using 1% or better tolerance resistors per the TI TPS735 datasheet formula. Keep divider impedance moderate (tens of kohm) to balance accuracy against quiescent drain. Thermal dissipation: at VIN 5 V, VOUT 3.3 V, 500 mA, the device dissipates 0.85 W, which the DRB package handles only with a well-connected thermal pad - verify junction temperature against the theta_JA in the datasheet thermal table.
Do not exceed 6.5 V input. If the enable function is not used, tie EN to VIN rather than leaving it floating to prevent undefined output states. Adding a noise-reduction capacitor on the NR pin improves noise and soft-start but increases start-up time - size it according to the datasheet graph if power sequencing matters. Using fixed-output family parts (e.g., TPS73533DRBR) on the same footprint requires removing the divider resistors since the feedback function differs.
合規資訊
RoHS compliant per TI product page and distributor listings. AEC-Q100 qualified version available as TPS73501QDRBRQ1. REACH and halogen-free status not stated in provided data.
