TPS610981 - 3.3V Boost Converter with Integrated LDO | TI
MPN: TPS610981 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.52 | $1.52 |
| 10 | $1.35 | $13.50 |
| 100 | $1.08 | $108.00 |
| 500 | $0.92 | $460.00 |
| 1,000 | $0.78 | $780.00 |
Drop-in alternatives for TPS610981 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TPS610985DSER
β Drop-Inπ Reference alternative (not in catalog)
TPS61099DSER
β Drop-Inπ Reference alternative (not in catalog)
TPS61299DSER
β Drop-Inπ Reference alternative (not in catalog)
TPS61099DSET
β Drop-Inπ Reference alternative (not in catalog)
TPS610985DSET
β Drop-Inπ Reference alternative (not in catalog)
TPS610981 Maximum Ratings & Electrical Characteristics
| Topology | Boost + LDO |
| Output Voltage (Boost) | 3.3 V (fixed) |
| Output Voltage (LDO) | 1.2 V to 3.3 V (adjustable) |
| Input Voltage Range | 0.7 V to 4.5 V |
| Maximum Output Current (Boost) | 300 mA (from 1.8V input) |
| Quiescent Current | 300 nA (typical) |
| Efficiency | 95% (peak) |
| Switching Frequency | [DATA_NEEDED: switching frequency] |
| LDO Dropout Voltage | [DATA_NEEDED: LDO dropout voltage] |
| Package | 6-WSON (1.5x1.5 mm) |
| Operating Temperature Range | -40Β°C to +85Β°C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Number of Outputs | 2 |
| Synchronous Rectification | Yes |
TPS610981 Pin Configuration
| Pin 1 | SW β Switch pin, connect to inductor |
| Pin 2 | GND β Ground |
| Pin 3 | FB β Feedback for LDO output |
| Pin 4 | EN β Enable pin, active high |
| Pin 5 | VIN β Input supply |
| Pin 6 | VOUT β Boost output |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TPS610981 is suitable for 6 applications: Wireless Sensor Nodes, Hearing Aids, Portable Medical Devices, IoT Smart Home Devices, Wearable Fitness Trackers, Remote Controls.
Wireless Sensor Nodes
The TPS610981's ultra-low quiescent current (300 nA) and high efficiency (up to 95%) make it ideal for wireless sensor nodes powered by coin cells or AA batteries. The 3.3V boost rail powers the microcontroller and RF transceiver, while the integrated LDO provides a clean, low-noise rail for analog sensors. This configuration extends battery life by minimizing standby power consumption, critical for nodes that spend most of their time in sleep mode. The small 6-WSON package fits compact PCB designs, and the wide input range (0.7V to 4.5V) accommodates battery voltage sag.
Recommended
Hearing Aids
Hearing aids require ultra-low power consumption and minimal size. The TPS610981's 300 nA quiescent current and 1.5x1.5mm package are perfect for this application. The boost converter provides a stable 3.3V rail for the audio processor, while the integrated LDO supplies a low-noise rail for the microphone and analog front-end. The device's high efficiency at light loads ensures long battery life from a single zinc-air cell. The integrated LDO eliminates the need for an external LDO, saving board space and reducing component count.
Recommended
Portable Medical Devices
Portable medical devices like glucose monitors and pulse oximeters demand reliable power from small batteries. The TPS610981 provides a regulated 3.3V rail for the main processor and a low-noise LDO rail for sensitive analog measurement circuits. The ultra-low quiescent current ensures long standby time between measurements. The device's wide input range supports various battery chemistries, and the small package enables miniaturized device designs. The integrated protection features (over-temperature, over-current) enhance system reliability.
Recommended
IoT Smart Home Devices
Smart home devices such as wireless sensors, smart locks, and environmental monitors benefit from the TPS610981's low power and small footprint. The boost converter efficiently steps up battery voltage to 3.3V for the main controller and wireless module, while the LDO provides a clean rail for sensors. The 300 nA quiescent current is ideal for always-on listening applications, extending battery life to years. The device's high efficiency at light loads ensures minimal power loss during intermittent operation. The compact package allows integration into small form-factor devices.
Recommended
Wearable Fitness Trackers
Wearable fitness trackers require ultra-low power and compact size. The TPS610981's 300 nA quiescent current and 1.5x1.5mm package are ideal for this application. The boost converter provides a stable 3.3V rail for the microcontroller and Bluetooth LE module, while the integrated LDO powers the accelerometer and heart-rate sensor. The device's high efficiency at light loads extends battery life between charges. The wide input range supports Li-Po batteries, and the small package enables slim wearable designs.
Recommended
Remote Controls
Remote controls for TVs, drones, and smart home devices benefit from the TPS610981's low power and small size. The boost converter provides a stable 3.3V rail for the IR transmitter and microcontroller, while the LDO powers the display or backlight. The ultra-low quiescent current ensures long battery life, even with frequent use. The device's high efficiency at light loads minimizes power drain during standby. The compact package allows for slim remote designs.
Recommended
Recommended Products Summary
Engineering reference data for TPS610981 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS610985DSER | TPS61099DSER | TPS61299DSER |
|---|---|---|---|---|
| Package | 6-WSON (1.5x1.5) | 6-WSON (1.5x1.5) | 6-WSON (1.5x1.5) | 6-WSON (1.5x1.5) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Boost Output Voltage | 3.3V (fixed) | 3.0V or 3.6V (fixed) | 3.3V (fixed) | 3.3V (fixed) |
| Integrated LDO | Yes | Yes | No | No |
| Quiescent Current | 300 nA | 300 nA | 300 nA | 400 nA |
| Max Output Current | 300 mA | 300 mA | 300 mA | 500 mA |
| Input Voltage Range | 0.7V to 4.5V | 0.7V to 4.5V | 0.7V to 4.5V | 0.7V to 4.5V |
| Efficiency | 95% | 95% | 95% | 96% |
Key Differentiators
- Ultra-low quiescent current of 300 nA (vs TPS61299DSER)
- Integrated LDO provides dual rails (vs TPS61099DSER)
- Fixed 3.3V boost output simplifies design (vs TPS610985DSER)
Design Notes
Place the input capacitor (10 Β΅F) and output capacitor (22 Β΅F) as close as possible to the VIN and VOUT pins. Use a 2.2 Β΅H inductor with low DCR for optimal efficiency. Ensure the ground connection is short and direct to minimize parasitic inductance.
The TPS610981's ultra-low quiescent current (300 nA) is achieved in PFM mode. To maintain this, avoid external resistor dividers on the LDO output that draw excessive current. Use high-value resistors (e.g., 1 MΞ©) for the feedback network to minimize quiescent current.
Although the TPS610981 is efficient, at maximum load (300 mA) the power dissipation can be significant. The 6-WSON package has a thermal resistance of approximately 50Β°C/W. Ensure adequate copper area on the PCB to dissipate heat, especially in high-temperature environments.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified.
