TPS79901DDCT (ADJUSTIBLE VOLTAGE VERSION) Texas Instruments Integrated Circuit (SOT23 (5-Pin)) In Stock
TPS79901DDCT is an adjustable-voltage low-dropout linear regulator delivering up to 200 mA output current with high PSRR. It supports a wide input voltage range and adjustable output suitable for noise-sensitive RF and analog circuits. Packaged in a compact SOT-23-5 for space-constrained portable and IoT power supply designs.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Adjustable output voltage with resistor-divider feedback for flexible low-noise LDO regulation up to 200 mA output current
- High PSRR performance across a wide frequency range reduces supply noise for RF front-ends and precision analog circuits
- SOT-23-5 package with only 2 external capacitors minimizes BOM and PCB footprint in portable power supply designs
Applications
The TPS79901DDCT is used in RF transceivers, precision analog signal chains, and low-power sensor modules requiring a clean, adjustable LDO supply with minimal external components. Its high power-supply rejection ratio makes it ideal for noise-sensitive applications such as GPS receivers, Bluetooth front-ends, and audio codecs operating from 3.3 V or 5 V input rails. The SOT-23-5 package simplifies integration into space-constrained battery-powered IoT devices and wearable electronics.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Datasheet
TPS79901DDCT (ADJUSTIBLE VOLTAGE VERSION) Datasheet DownloadOfficial datasheet from Texas Instruments
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TPS79901DDCT (ADJUSTIBLE VOLTAGE VERSION):
Adjustable Positive LDO Regulator, 1.2V Min, 6.5V Max, 0.175V Dropout, BICMOS, PDSO5
Adjustable Positive LDO Regulator, 1.2V Min, 6.5V Max, 0.175V Dropout, BICMOS, PDSO5
Frequently Asked Questions
What is the maximum output current of TPS79901DDCT and is 200 mA sufficient for typical RF module power supply requirements?
The TPS79901DDCT supplies up to 200 mA, which covers the peak current demand of most low-power RF modules such as Bluetooth LE and Zigbee transceivers that typically require 50 mA to 150 mA during transmit bursts. For designs requiring more than 200 mA, a higher-current companion like TPS799xx in a larger SOT-23 variant or a WSON package would be needed to maintain adequate headroom.
How do you set the output voltage of TPS79901DDCT and what resistor values are needed for a 1.8 V regulated output?
The TPS79901DDCT output voltage is set with a resistor divider from output to feedback pin to ground. Using a standard feedback reference of approximately 0.8 V to 1.0 V, a top resistor of 100 kΩ and a bottom resistor of approximately 82 kΩ to 100 kΩ produces a 1.8 V output, depending on the exact reference voltage. This 2-resistor configuration requires no external compensation capacitor beyond the recommended 1 µF output capacitor.
Why is high PSRR important for TPS79901DDCT in RF and audio applications, and what PSRR level should designers target?
High PSRR ensures that switching noise on the input supply—typically 50 mV to 200 mV ripple from a nearby DC-DC converter—is attenuated before reaching sensitive RF or audio circuits. A PSRR of 60 dB at 1 kHz, which LDOs like TPS79901DDCT are designed to achieve, reduces a 100 mV supply ripple to only 100 µV on the regulated output, preventing receiver desensitization and audio THD degradation in mixed-signal system designs.
How does the SOT-23-5 package of TPS79901DDCT compare to larger SOT-223 LDOs for portable device designs?
The SOT-23-5 package of TPS79901DDCT measures approximately 1.6 mm × 1.6 mm body, over 10× smaller than the SOT-223 package at 3.5 mm × 6.5 mm. While SOT-223 LDOs can handle 500 mA to 1 A due to better thermal dissipation, for applications requiring only 200 mA the SOT-23-5 saves significant board area in wearables and IoT sensor nodes where PCB footprint is measured in single-digit square millimeters.
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Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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