TPS71728DCKRG4 Texas Instruments Integrated Circuit (SOT23 (5-Pin)) In Stock
TPS71728DCKRG4 is a 150 mA fixed-output LDO voltage regulator from Texas Instruments with a 2.8 V output and only 170 mV typical dropout. It operates from 3.1 V to 6.5 V input and is housed in a tiny SOT23-5 package for space-constrained portable designs.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Datasheet
- TPS71728DCKRG4 Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.5126(MOQ 6000)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Ultra-low 170 mV typical dropout voltage at 150 mA extends battery runtime in 3.3 V to 2.8 V conversion for Li-ion powered devices
- Fixed 2.8 V output eliminates external resistor divider, reducing component count and layout complexity
- Compact SOT23-5 package occupies less than 10 mm² of board area, ideal for wearables and handheld instruments
Applications
TPS71728DCKRG4 is well-suited for powering RF transceivers, low-voltage sensors, and microcontrollers in battery-operated IoT nodes where the 2.8 V supply rail must be derived from a 3.3 V or Li-ion battery. Its low dropout and 150 mA current capability make it a good fit for Bluetooth and Zigbee modules that require a stable, noise-free 2.8 V supply even as the battery discharges. The device also serves as a post-regulator in USB-powered wearables and portable medical devices.
Specifications
| YTEOL | 15 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 0.3V |
| Dropout Voltage1-Nom | 0.17V |
| Input Voltage Absolute-Max | 7V |
| Input Voltage-Max | 6.5V |
| Input Voltage-Min | 3.1V |
| JESD-30 Code | R-PDSO-G5 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 0.15A |
| Output Voltage1-Max | 2.884V |
| Output Voltage1-Min | 2.716V |
| Output Voltage1-Nom | 2.8V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP5/6,.08 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | YES |
| Technology | BICMOS |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Voltage Tolerance-Max | 3% |
| Package | SOT23 (5-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TPS71728DCKRG4:
Frequently Asked Questions
What is the dropout voltage of TPS71728DCKRG4 at full load, and how does it extend battery life?
TPS71728DCKRG4 has a typical dropout voltage of only 170 mV at 150 mA load current, with a maximum of 300 mV. This low dropout means the regulator keeps the 2.8 V output regulated until the input (battery) voltage drops to just 2.97 V, squeezing extra runtime from a lithium coin cell that would otherwise cut off at a higher voltage. Compared to a standard 1.2 V dropout LDO, this saves approximately 1 V of headroom, significantly extending usable capacity in wearable and remote-sensor applications.
Can TPS71728DCKRG4 power a Bluetooth LE module operating at 2.8 V from a single-cell Li-ion battery?
Yes. TPS71728DCKRG4 accepts an input from 3.1 V to 6.5 V, which covers the full discharge range of a Li-ion cell (nominally 3.7 V, discharging to approximately 3.0 V). Its fixed 2.8 V output and 150 mA current capacity comfortably supply most Bluetooth LE radio transceivers, which typically peak at 10 mA to 20 mA during RF transmission. The regulator's enable pin also allows the host MCU to power-gate the radio during sleep modes, further reducing standby current consumption.
How small is the PCB footprint of TPS71728DCKRG4, and what external components does it need?
The SOT23-5 package body measures approximately 1.6 mm × 2.9 mm, occupying around 4.6 mm² of PCB area. The regulator requires only an input bypass capacitor of 1 µF and an output capacitor of 1 µF, both small 0402 ceramics, for stable operation. This minimal 3-component solution is among the most compact single-rail LDO implementations available, making it popular in wearable electronics, hearing aids, and compact sensor modules where every square millimeter counts.
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About Texas Instruments
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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 6000+ | $0.5256 | $3153.72 |
| 9000+ | $0.5195 | $4675.14 |
| 15000+ | $0.5126 | $7689.60 |
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