TPS610981 - 3.3V Ultra-Low Iq Boost + LDO | Texas Instruments
MPN: TPS610981DSER β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.21 | $12.10 |
| 100 | $0.96 | $96.00 |
| 500 | $0.79 | $395.00 |
| 1,000 | $0.62 | $620.00 |
Drop-in alternatives for TPS610981DSER 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:
TPS610980DSER
β Drop-Inπ Reference alternative (not in catalog)
TPS610981DSET
β Drop-Inπ Reference alternative (not in catalog)
TPS610982DSER
β Drop-Inπ Reference alternative (not in catalog)
TPS61291DSER
β‘ Same Packageπ Reference alternative (not in catalog)
TPS61299DSER
β‘ Same Packageπ Reference alternative (not in catalog)
TLV61225DSER
β‘ Same Packageπ Reference alternative (not in catalog)
TPS610981DSER Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Boost with Integrated LDO |
| Number of Outputs | 2 |
| Output Voltage (Boost) | 3.3 V (fixed) |
| Output Voltage (LDO) | Regulated, powered from boost output |
| Input Voltage Range | [DATA_NEEDED: min/max input voltage] |
| Switch Current Limit | [DATA_NEEDED: switch current limit] |
| Quiescent Current | 300 nA (typical) |
| Peak Efficiency | up to 95% |
| Battery Types Supported | 1-2 cell alkaline/NiCd/NiMH, 1-cell coin cell, 1-cell Li-Ion/Li-polymer |
| Control Scheme | PFM at light load, PWM at heavy load |
| Load Disconnect | Yes (true disconnect during shutdown) |
| Protection | Overcurrent, overtemperature |
| Operating Temperature | -40C to 85C |
| Package | 6-WSON (1.5x1.5 mm) [DSG] |
| Mounting Type | Surface Mount |
| Recommended Inductor | 2.2 uH (typical) |
| RoHS Status | Compliant |
TPS610981DSER Pin Configuration
| Pin 1 | SW β Boost converter switch node - connect to inductor |
| Pin 2 | GND β Ground |
| Pin 3 | VOUT β Boost regulated output (3.3 V) |
| Pin 4 | LDO β Integrated LDO regulated output |
| Pin 5 | EN β Enable control input |
| Pin 6 | VIN β Battery input supply |
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
TPS610981DSER is suitable for 6 applications: Wireless IoT Sensor Nodes, Hearing Aids and Wearables, Portable Medical Devices, Single-Cell Li-Ion Battery Systems, Energy Harvesting and Remote Monitoring, Portable Audio Devices.
Wireless IoT Sensor Nodes
Battery-powered IoT nodes spend most of their life in sleep, making the TPS610981's 300 nA quiescent current decisive for multi-year operation from a single coin cell or alkaline cell. The synchronous boost raises the decaying cell voltage to a stable 3.3V rail for the MCU and radio, while the integrated LDO supplies a low-noise rail for the RF transceiver or analog front end, all in a 1.5x1.5mm footprint that fits coin-cell-sized PCBs.
Recommended
Hearing Aids and Wearables
Hearing aids and wearables demand extreme miniaturization and long battery life; the TPS610981 addresses both with its 6-WSON 1.5x1.5mm package and 300 nA standby current. Running from a single zinc-air or Li-Ion cell, the boost delivers 3.3V for the audio DSP while the integrated LDO powers low-noise analog sections such as microphone bias or codec supplies, eliminating a second regulator IC and saving board area and cost.
Recommended
Portable Medical Devices
Portable medical monitors and diagnostic devices require clean, stable rails for analog measurement circuits even as the battery discharges. The TPS610981's boost stage maintains a firm 3.3V rail for the MCU and display, while the integrated LDO provides a low-ripple supply for sensors and signal conditioning. True load disconnect prevents battery drain in storage, and integrated overcurrent and overtemperature protection support robust, safe operation in patient-adjacent products.
Recommended
Single-Cell Li-Ion Battery Systems
A single Li-Ion cell swings from 4.2V down toward 3V or lower, yet many 3.3V peripherals need regulation across this whole range. The TPS610981's low-input synchronous boost continues delivering a solid 3.3V rail as the cell discharges, with up to 95% efficiency at load. The integrated LDO adds a second regulated rail for analog circuitry, and the 300 nA quiescent draw minimizes standby losses between charging cycles in portable products.
Recommended
Energy Harvesting and Remote Monitoring
Remote monitoring endpoints powered by small primary cells or harvested energy benefit from the TPS610981's ability to start and regulate from very low input voltages. The PFM control scheme keeps conversion losses negligible at microamp average loads, so a small cell can sustain a radio-plus-sensor node for years. The 3.3V boost rail runs the MCU and RF link, while the LDO rail powers the analog sensor, all within a footprint small enough for compact remote units.
Recommended
Portable Audio Devices
In compact audio products such as recorders and portable codecs, power-supply noise directly affects the audio signal path. The TPS610981's integrated LDO filters the boost output, providing a low-noise rail for the audio codec or microphone amplifier, while the 3.3V boost rail powers the digital section from a single cell. This two-rail, one-IC approach reduces component count and keeps analog and digital supplies separated for better noise performance.
Recommended
Recommended Products Summary
Engineering reference data for TPS610981DSER β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS610980DSER | TPS61291DSER | TPS61299DSER |
|---|---|---|---|---|
| Package | 6-WSON (1.5x1.5 mm) | 6-WSON (1.5x1.5 mm) - same | 6-WSON - same family size, different pinout | 6-WSON - same family size, different pinout |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Boost Output Voltage | 3.3 V fixed | 3.3 V fixed (load switch secondary) | Adjustable | [DATA_NEEDED] |
| Integrated LDO | Yes | No (load switch) | No | No |
| Quiescent Current | 300 nA typ | ~300 nA typ | [DATA_NEEDED] | [DATA_NEEDED] |
| Secondary Rail | LDO output | Load switch output | None | None |
| Pin Compatible | - | Yes (drop-in) | No | No |
| Load Disconnect | Yes | Yes | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Integrated second rail (LDO) (vs TPS61299DSER)
- Ultra-low 300 nA quiescent current (vs TLV61225DSER)
- True load disconnect at shutdown (vs TPS61291DSER)
Design Notes
In the 1.5x1.5mm WSON-6 layout, place the 2.2 uH inductor within 1 mm of the SW pin and keep the SW node copper area minimal to limit EMI. Place input ceramic capacitor directly at VIN/GND and the output capacitor at VOUT/GND with short, wide traces. Use multiple vias to the ground plane under the device thermal pad for low-impedance return and heat dissipation.
The 300 nA quiescent current benefit is lost if leaky external components are used: select ceramic capacitors with low leakage and a resistor divider-free fixed-output configuration where possible. In shutdown, true load disconnect prevents the output from back-feeding the battery, but downstream leakage paths in the load circuit can still drain the cell - audit the full BOM for standby consumption.
Do not substitute a different pinout boost converter (e.g., TPS61299, TLV61225) without PCB rework - TI explicitly marks these as same-function, different pinout. Also verify the LDO output current budget: the LDO is powered from the boost output, so total load current must stay within the converter's capability; oversizing the LDO rail load can collapse the boost rail at low battery voltage.
Compliance Information
RoHS compliant and lead-free per TI product page and DigiKey listing. REACH, halogen-free, and conflict minerals status should be confirmed via TI.com quality/environmental documentation.
