Texas Instruments
TPS7A3301 - 1A, -36V Ultra-Low Noise Negative LDO | Texas Instruments
MPN: TPS7A3301 ✓ Hoạt động
-1.18 V to -33 V Vdss
1 A Id
31.4 C/W Rds(on)
VQFN-20 (RGW) 5x5 mm Package
MOQ: 1 |
TPS7A3301 Tóm tắt
The Texas Instruments TPS7A3301 is a negative-voltage, ultra-low-noise, high-PSRR linear regulator capable of delivering up to 1A of output current. It is designed for applications requiring a clean negative supply rail, such as audio, RF, and precision analog systems. The device operates from an input voltage range of -3V to -36V and provides an adjustable output voltage from -1.18V to -33V, set by external resistors. It is available in a 20-pin VQFN (RGW) package with an exposed thermal pad, enabling efficient heat dissipation in compact designs.
Key features include an output noise of 12.7 uVrms (20 Hz to 100 kHz), a power supply rejection ratio (PSRR) of 75 dB at 1 kHz, and a low dropout voltage of 300 mV at full 1A load. The device also offers an active-low enable pin for power sequencing, a programmable soft-start function to limit inrush current, and thermal shutdown protection. The VQFN-20 package provides a thermal resistance of 31.4 C/W, allowing moderate power dissipation without external heatsinking.
The TPS7A3301 employs a precision bandgap reference and a low-noise architecture, achieving noise performance comparable to discrete reference designs while maintaining regulator simplicity. The high PSRR minimizes ripple from upstream switching converters, making it ideal for noise-sensitive analog and RF signal chains where clean negative power rails are critical.
Typical applications include audio DAC and op-amp negative supplies, RF transceiver bias circuits, precision ADC/DAC reference buffering, and test and measurement instrumentation. The wide input range also supports industrial -24V bus systems with adequate headroom.
When designing with this device, ensure adequate input-to-output voltage headroom to maintain regulation under all load conditions. The enable pin allows sequential power-up in multi-rail systems, which is essential for processors requiring specific rail sequencing. Proper PCB layout with adequate copper pour is recommended for thermal management.
Key features include an output noise of 12.7 uVrms (20 Hz to 100 kHz), a power supply rejection ratio (PSRR) of 75 dB at 1 kHz, and a low dropout voltage of 300 mV at full 1A load. The device also offers an active-low enable pin for power sequencing, a programmable soft-start function to limit inrush current, and thermal shutdown protection. The VQFN-20 package provides a thermal resistance of 31.4 C/W, allowing moderate power dissipation without external heatsinking.
The TPS7A3301 employs a precision bandgap reference and a low-noise architecture, achieving noise performance comparable to discrete reference designs while maintaining regulator simplicity. The high PSRR minimizes ripple from upstream switching converters, making it ideal for noise-sensitive analog and RF signal chains where clean negative power rails are critical.
Typical applications include audio DAC and op-amp negative supplies, RF transceiver bias circuits, precision ADC/DAC reference buffering, and test and measurement instrumentation. The wide input range also supports industrial -24V bus systems with adequate headroom.
When designing with this device, ensure adequate input-to-output voltage headroom to maintain regulation under all load conditions. The enable pin allows sequential power-up in multi-rail systems, which is essential for processors requiring specific rail sequencing. Proper PCB layout with adequate copper pour is recommended for thermal management.
Bộ thay thế dễ dàng lắp đặt cho TPS7A3301 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
TPS7A4701RGWR
Texas Instruments
Adjustable · 1.4 V to 34 V · 1 A · 3 V to 35 V · 200 mV at 1 A · 4.17 uVrms (20 Hz to 100 kHz) · 72 dB at 1 kHz · 6.4 mA
Liên hệ để biết giá
Xem tài liệu →LT3094
Analog Devices
Adjustable · 0 V to -19.5 V · 500 mA · -2.2 V to -20 V · 300 mV at 500 mA · 0.8 uVrms (10 Hz to 100 kHz) · 79 dB at 1 kHz · 2.2 mA
Liên hệ để biết giá
Xem tài liệu →ADP7182
0.2A, 65dB PSRR
📋 Tham chiếu thay thế (không có trong danh mục)
LT3015
1.5A, higher current
📋 Tham chiếu thay thế (không có trong danh mục)
TPS7A3301 Tỷ lệ tối đa & tính chất điện
| Kiểu đầu ra | Adjustable |
| Khoảng điện áp đầu ra | -1.18 V to -33 V |
| Điện áp tối đa đầu ra | 1 A |
| Phạm vi điện áp đầu vào | -3 V to -36 V |
| Điện áp mất áp | 300 mV at 1 A |
| Tiếng ồn đầu ra | 12.7 uVrms (20 Hz to 100 kHz) |
| PSRR | 75 dB at 1 kHz |
| Điện áp yên tĩnh | 6.4 mA |
| Kháng nhiệt | 31.4 C/W |
| Nhiệt độ hoạt động | -40C to +125C |
| Hộp | VQFN-20 (RGW) 5x5 mm |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 2 (1 year) |
| Trạng thái RoHS | Compliant |
| N Nap kích hoạt | Yes (active-low) |
Cấu hình chân TPS7A3301
| Chân 1 | OUT — Regulated negative output voltage |
| Chân 5 | GND — Ground |
| Chân 6 | EN — Enable (active low) |
| Chân 7 | IN — Negative input supply |
Ứng dụng tiêu biểu
TPS7A3301 phù hợp cho 6 Áp dụngs: High-End Audio DAC Negative Supply, RF Transceiver Bias, Precision ADC/DAC Reference, Industrial -24V Bus Systems, Test and Measurement Instrumentation, Medical Monitoring Equipment.
High-End Audio DAC Negative Supply
Provides clean -5V rail for audio DACs with 12.7uVrms noise.
Được đề xuất
RF Transceiver Bias
Provides low-noise negative bias for RF amplifiers and mixers.
Được đề xuất
Precision ADC/DAC Reference
Buffers negative reference voltages for precision converters.
Được đề xuất
Industrial -24V Bus Systems
Regulates -24V industrial buses to lower voltages for control circuits.
Được đề xuất
Test and Measurement Instrumentation
Provides clean negative rails for precision measurement circuits.
Được đề xuất
Medical Monitoring Equipment
Supplies low-noise negative rails for sensitive medical sensors.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
PCM1794A
DAC requiring low-noise negative supply Được sử dụng trong: High-End Audio DAC Negative Supply
OPA1612
I/V converter op-amp Được sử dụng trong: High-End Audio DAC Negative Supply
ADF4351
PLL/VCO requiring clean negative rail Được sử dụng trong: RF Transceiver Bias
HMC241A
RF switch Được sử dụng trong: RF Transceiver Bias
ADS8881
ADC requiring low-noise reference Được sử dụng trong: Precision ADC/DAC Reference
DAC8811
DAC requiring negative reference Được sử dụng trong: Precision ADC/DAC Reference
TPS7A4701
Positive LDO for dual-supply systems Được sử dụng trong: Industrial -24V Bus Systems
LMZM23601
DC-DC converter for pre-regulation Được sử dụng trong: Industrial -24V Bus Systems
OPA2277
Precision op-amp requiring negative supply Được sử dụng trong: Test and Measurement Instrumentation
REF5025
Voltage reference Được sử dụng trong: Test and Measurement Instrumentation
ADS1298
Biomedical ADC requiring negative supply Được sử dụng trong: Medical Monitoring Equipment
OPA333
Zero-drift op-amp Được sử dụng trong: Medical Monitoring Equipment
What is the output voltage range of TPS7A3301?
The TPS7A3301 adjustable version outputs from -1.18V to -33V using external resistor dividers. According to TI datasheet SBVS068, the output is set by two external resistors with the formula VOUT = -1.18V * (1 + R1/R2).
Does TPS7A3301 require a heatsink at 1A output?
At VIN=-12V, VOUT=-5V, and 1A load, the TPS7A3301 dissipates approximately 7W of power. With a thermal resistance of 31.4 C/W (theta_JA), the junction temperature would rise 220C above ambient. A heatsink or substantial copper pour (at least 1 square inch) is required for reliable operation above 2-3W dissipation.
What is the difference between TPS7A3301 and TPS7A4701?
The TPS7A3301 is a negative-voltage LDO, while the TPS7A4701 is a positive-voltage LDO. Both share similar noise and PSRR specifications, but the TPS7A3301 operates with negative input and output voltages, making it suitable for dual-supply audio and analog applications.
What is the output noise of TPS7A3301?
The TPS7A3301 has an output noise of 12.7 uVrms over the 20 Hz to 100 kHz bandwidth. This makes it suitable for noise-sensitive applications such as audio DACs, RF synthesizers, and precision ADC references.
Can TPS7A3301 be used for audio applications?
Yes, the TPS7A3301 is ideal for audio DAC and op-amp negative supplies due to its 12.7 uVrms ultra-low noise and 75 dB PSRR at 1 kHz. These specifications ensure clean power rails that do not introduce audible noise or interference into the audio signal path.
What is the input voltage range of TPS7A3301?
The TPS7A3301 operates from -3V to -36V input voltage. This wide range allows it to be used in industrial -24V bus systems and other applications requiring a negative supply.
Does TPS7A3301 have an enable pin?
Yes, the TPS7A3301 has an active-low enable pin for power sequencing. This allows the regulator to be turned off by pulling the enable pin low, which is useful in multi-rail systems requiring specific power-up sequences.
What is the dropout voltage of TPS7A3301?
The TPS7A3301 has a dropout voltage of 300 mV at full 1A load. This low dropout allows efficient regulation even when the input-to-output voltage difference is small, reducing power dissipation.
Is TPS7A3301 RoHS compliant?
Yes, the TPS7A3301 is RoHS compliant. According to TI product page, the device is lead-free and halogen-free, meeting current environmental standards.
What is the package of TPS7A3301?
The TPS7A3301 is available in a 20-pin VQFN (RGW) package measuring 5x5 mm. This surface-mount package includes an exposed thermal pad for improved heat dissipation.
What is the quiescent current of TPS7A3301?
The TPS7A3301 has a quiescent current of 6.4 mA. This low quiescent current helps maintain efficiency in battery-powered or power-sensitive applications.
What is the PSRR of TPS7A3301?
The TPS7A3301 has a PSRR of 75 dB at 1 kHz. This high PSRR minimizes ripple from upstream switching converters, ensuring a clean output voltage for noise-sensitive circuits.
Can TPS7A3301 be used in industrial applications?
Yes, the TPS7A3301 is suitable for industrial applications due to its wide input voltage range (-3V to -36V) and operating temperature range (-40C to +125C). It can be used in -24V bus systems and other industrial power supplies.
What is the thermal resistance of TPS7A3301?
The TPS7A3301 has a thermal resistance of 31.4 C/W (theta_JA) in the VQFN-20 package. This value is important for calculating junction temperature and ensuring reliable operation under load.
What is the difference between TPS7A3301 and TPS7A3300?
The TPS7A3301 includes an active-low enable pin for power sequencing, while the TPS7A3300 does not have an enable pin. Both share identical noise (12.7 uVrms) and PSRR (75 dB at 1 kHz) specifications.
Dữ liệu tham khảo kỹ thuật cho TPS7A3301 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
Choose TPS7A3301 when you need ultra-low noise (sub-15 uVrms) AND high output current (up to 1A) in a negative LDO. Choose LT3094 instead if your current requirement is below 200mA and you need the absolute lowest noise (0.8 uVrms). Choose LT3015 if noise is less critical but you need more than 1A output. Choose ADP7182 for a balance of moderate noise and current with lower input voltage ranges. For dual-supply systems, pair TPS7A3301 with TPS7A4701 for symmetric positive and negative rails.
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LT3094 | ADP7182 | LT3015 |
|---|---|---|---|---|
| Output Current | 1 A | 0.2 A | 0.2 A | 1.5 A |
| Output Noise | 12.7 uVrms | 0.8 uVrms | 1.0 uVrms | 6.8 uVrms |
| PSRR at 1kHz | 75 dB | 79 dB | 65 dB | 40 dB |
| Input Voltage Range | -3 V to -36 V | -2.2 V to -20 V | -2.7 V to -28 V | -1.9 V to -30 V |
| Dropout Voltage | 300 mV at 1 A | 300 mV at 0.2 A | 200 mV at 0.2 A | 300 mV at 1.5 A |
| Enable Pin | Yes (active-low) | Yes (active-low) | Yes (active-low) | Yes (active-low) |
| Package | VQFN-20 | DFN-12 | LFCSP-8 | DDPAK-5 |
| Price (1pc) | 4.85 USD | 5.50 USD | 3.20 USD | 4.10 USD |
Bảo phân biệt quan trọng
- Highest output current in ultra-low-noise negative LDO class (vsLT3094)
- Widest input voltage range (vsADP7182)
- Best PSRR at 1kHz (vsLT3015)
Ghi chú thiết kế
At VIN=-12V, VOUT=-5V, and 1A load, power dissipation is 7W. The VQFN-20 package has theta_JA of 31.4 C/W, resulting in a 220C junction temperature rise. A heatsink or at least 1 square inch of copper pour is required for reliable operation above 2W dissipation.
Place input and output capacitors as close to the IC pins as possible. Use a 10uF ceramic capacitor on the input and a 10uF ceramic capacitor on the output. Add a 0.1uF ceramic capacitor in parallel for high-frequency noise bypass.
Do not exceed the maximum input voltage of -36V. Ensure the external resistor divider uses 1% or better tolerance resistors to maintain output voltage accuracy. The NR/SS capacitor controls startup time and noise bandwidth - do not omit it.
Thông tin tuân thủ
RoHS
Compliant
REACH
Compliant
AEC-Q100
Not Applicable
Không chì
Yes
Không halogen
Yes
Khoáng vật xung đột
Compliant
RoHS compliant per TI product page. Not AEC-Q100 qualified - not intended for automotive safety applications.
Dữ liệu được xác minh vào: 2026-08-17
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