TPS61220DCKR - 0.7V Boost Converter, 5.5µA IQ, SOT-SC70 | TI
MPN： TPS61220DCKR ✓ 啟用中TPS61220DCKR 概覽
A boost converter (also called a step-up converter or step-up DC-DC switching regulator) is a switched-mode power supply topology that produces a higher output voltage than its input. Boost converters sit inside the broader voltage regulator family (which also includes buck, buck-boost, and LDO topologies) and within the larger category of power management ICs. They are commonly used whenever a system rail must be derived from a low-voltage battery source where linear regulation would be inefficient or infeasible.
Key features of the TPS61220 include up to 95% efficiency at typical operating conditions, 5.5 µA quiescent current for low standby drain, and startup into load from 0.7 V input. It supports a wide VIN range up to 5.5 V and provides a pass-through mode for low dropout operation. The 6-pin SC-70 package enables a very compact PCB footprint.
Technically, the converter uses synchronous rectification and a fixed-frequency PWM control loop with internal power MOSFETs, achieving the high efficiency figure. The low quiescent current extends battery life during standby, while the wide operating input range allows the same part to be used across multiple battery chemistries without redesign.
Typical applications include single-cell battery powered products such as wearables, IoT sensor nodes, remote controls, and handheld metering devices. The TPS61220 is also suitable for boosting Li-Ion battery voltage for 3.3 V or 5 V system rails and for low-voltage sensor bias supplies.
When designing with this part, ensure that the input and output capacitors match the datasheet recommendations and that the peak switch current rating is not exceeded. The pass-through function should be considered when sequencing rails, as EN low does not disconnect the output from the input.
This page synthesizes distributor pricing, drop-in compatible alternatives in the same SC-70 package, and practical design notes that go beyond the manufacturer datasheet summary.
直接替換替代品，適用於 TPS61220DCKR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TPS61220DCKR （相同外形與佔位） — 差異在於 Efficiency, Enable Pin, Operating Temperature, Package, Quiescent Current.
TPS61221DCKR
✅ 直接替換📋 參考替代品（不在目錄中）
TPS61220DCKT
✅ 直接替換📋 參考替代品（不在目錄中）
TPS61220DCK
✅ 直接替換聯絡詢價
查看資料表 →TPS61222MDCKTEP
✅ 直接替換📋 參考替代品（不在目錄中）
TPS61220DCKR 最大額定值與電氣特性
| 拓撲 | Boost (Step-Up) |
| 輸入電壓範圍 | 0.7 V to 5.5 V |
| 輸出電壓範圍 | 1.8 V to 5.5 V (adjustable) |
| Switch Current (Max) | 200 mA |
| 靜態電流 | 5.5 µA |
| 效率 | Up to 95% at typical operating conditions |
| 輸出類型 | Adjustable |
| 輸出數量 | 1 |
| Switching Topology | Synchronous |
| 封裝 | 6-pin SOT-SC70 (DCK), 2 mm × 2 mm |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40 °C to +125 °C |
| Pass-Through Function | Yes (when VIN ≥ VOUT - 0.7 V) |
| 致能腳位 | Yes (EN high = active; EN low enables pass-through) |
| RoHS 狀態 | Compliant |
TPS61220DCKR 腳位配置
| 腳位 1 | VIN — Input voltage supply (0.7 V to 5.5 V) |
| 腳位 2 | GND — Ground |
| 腳位 3 | EN — Enable (active high - LOW engages pass-through mode) |
| 腳位 4 | FB — Feedback for adjustable output (VOUT = 1.8 V to 5.5 V) |
| 腳位 5 | VOUT — Regulated output voltage |
| 腳位 6 | NC — Not connected (per datasheet) |
典型應用
TPS61220DCKR 適用於 6 應用s: Wearable Devices & Fitness Trackers, IoT Sensor Nodes & Wireless Transmitters, Remote Controls & Handheld Metering, Single-Cell Li-Ion Powered Products, Low-Voltage Sensor Bias Supply, Energy Harvesting & Backup Power.
Wearable Devices & Fitness Trackers
The TPS61220DCKR's 5.5 µA quiescent current and 0.7 V minimum VIN make it ideal for wearables powered by a single alkaline, NiMH, or Li-Ion coin cell. It boosts the battery voltage (often 1.0–3.0 V under load) up to a stable 1.8 V or 3.3 V system rail for the MCU, Bluetooth Low Energy radio, and sensor ICs. The 2 mm × 2 mm SOT-SC70 footprint plus a single small inductor and two ceramic capacitors fit easily on the wristband-sized PCB, and the up to 95% efficiency minimizes energy waste - critical for extending battery life across days of continuous use.
推薦
IoT Sensor Nodes & Wireless Transmitters
For battery-powered IoT sensor nodes transmitting on Sub-GHz or BLE, the TPS61220DCKR delivers a stable 3.3 V rail from a single AA alkaline cell (which sags to 0.7–1.0 V near end-of-life). The 5.5 µA Iq extends shelf life and standby life, while the 200 mA peak switch current handles the transmit burst current drawn by the radio. The adjustable output range (1.8–5.5 V) lets the same boost converter support multiple radio modules. Designers should select a low-DCR inductor and place input/output capacitors close to the IC to keep the high-current switching loop tight and minimize EMI.
推薦
Remote Controls & Handheld Metering
Infrared remote controls and handheld multimeters use one or two AAA/AA cells with operating voltages between 0.7 V (depleted) and 3.0 V (fresh). The TPS61220DCKR boosts this variable input to a fixed 3.0 V or 3.3 V rail that powers the microcontroller, the IR LED driver, and the display. Pass-through mode allows the system to operate directly from the battery when VIN is already higher than VOUT, avoiding boost-conversion losses when the cell is fresh. The low-Iq also supports long shelf life in remote controls that spend most of their time in standby.
推薦
Single-Cell Li-Ion Powered Products
Single-cell Li-Ion batteries discharge from 4.2 V (fully charged) down to 3.0 V (cutoff), and the TPS61220DCKR can boost this entire voltage range up to a stable 5 V rail for USB-powered peripherals, audio amplifiers, or 5 V sensors. The pass-through function engages when VIN already exceeds VOUT minus 0.7 V, so the converter does not waste efficiency when the Li-Ion cell is fresh. This makes the part attractive for portable USB accessories, wireless headsets, and any product that needs a 5 V rail from a single Li-Ion source without the bulk of a two-cell battery pack.
推薦
Low-Voltage Sensor Bias Supply
Precision sensors such as electrochemical gas sensors, optical dust sensors, and some MEMS microphones require a stable bias voltage above the battery voltage. The TPS61220DCKR generates a clean 3.3 V or 5 V bias rail from a single 1.5 V AA cell. Its up to 95% efficiency reduces heat dissipation near the sensor and minimizes battery drain during continuous sampling. The synchronous rectifier topology keeps the output ripple low enough for many sensor front-ends, and an optional output RC filter can further reduce switching noise for the most sensitive measurements.
推薦
Energy Harvesting & Backup Power
Energy-harvesting systems that draw from small photovoltaic cells, thermoelectric generators, or NFC/RF harvesters produce variable voltages often below 1 V. The TPS61220DCKR's 0.7 V startup voltage lets the system bootstrap from these weak sources. The 5.5 µA Iq and pass-through mode both contribute to high overall energy-conversion efficiency in the standby-harvest cycle. Combined with a small Li-Ion or thin-film backup cell, the TPS61220DCKR builds a complete micropower supply for predictive maintenance sensors, smart locks, and other low-duty-cycle wireless devices.
推薦
推薦產品摘要
工程參考資料，適用於 TPS61220DCKR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TPS61221DCKR | TPS61220DCKT | TPS61220DCK | TPS61222MDCKTEP | TLV61220DBVR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 6-pin SOT-SC70 (DCK), 2 mm × 2 mm | 6-pin SOT-SC70 (DCK) - same | 6-pin SOT-SC70 (DCK) - same | 6-pin SOT-SC70 (DCK) - same | 6-pin SOT-SC70 (DCK) - same | SOT-23-5 (DBV) - DIFFERENT footprint |
| Topology | Boost (Step-Up) | Boost (Step-Up) | Boost (Step-Up) | Boost (Step-Up) | Boost (Step-Up) | Boost (Step-Up) |
主要差異化特點
- Same SC-70-6 footprint, fixed 3.3 V output - drop-in alternative with no feedback resistors (對比TPS61221DCKR)
- Identical die with tape-and-reel packaging code variation (對比TPS61220DCKT)
- Higher-current TPS6122x family variant in same SC-70-6 package (對比TPS61222MDCKTEP)
- Same TI low-IQ boost family in a different package (對比TLV61220DBVR)
設計說明
Estimated: with peak switch currents up to 200 mA, the TPS61220DCKR requires a tight PCB switching-loop layout. Place the input capacitor, output capacitor, and inductor within 2–3 mm of the IC pins to minimize loop area. Use a ground pour on the top layer stitched with multiple vias to a bottom ground plane. The SOT-SC70 package dissipates minimal heat but the LX node carries fast-switching edges, so keep sensitive analog traces (e.g. feedback node) away from the inductor.
Do not assume EN LOW disables the output. The TPS61220 family engages pass-through mode when EN is LOW (per TI E2E forum), connecting VOUT to VIN through the internal MOSFETs. For true output isolation in shutdown, add an external load switch between VOUT and the load. Also ensure the inductor saturation current exceeds the peak switch current of 200 mA with at least 30% margin - choose a 0.5 A saturation-rated inductor for reliable operation across all VIN/VOUT combinations.
Select the inductor based on the target switching frequency and peak current. For the TPS61220DCKR, a 4.7 µH inductor with low DCR (under 0.2 Ω) is a common starting point. Use X7R or X5R ceramic input and output capacitors rated for at least 10 V, with typical values of 4.7 µF to 10 µF each. Place a small 0.1 µF ceramic in parallel if the layout has long input traces, to suppress high-frequency ringing on VIN.
Estimated: at full 200 mA switch current and a VIN of 1.5 V stepping up to 5 V, the converter dissipates well under 0.1 W in normal operation, and the SOT-SC70 (DCK) package thermal resistance of approximately 250 °C/W to 300 °C/W results in a junction temperature rise of only 25–30 °C above ambient. No heatsink is required. However, in enclosed enclosures with poor airflow or at sustained high ambient temperatures, verify thermal performance by measuring the package temperature in the final design.
合規資訊
RoHS compliant per TI product page. Not AEC-Q100 qualified - for automotive applications, use a TI automotive-grade boost converter. Halogen-free status not specified in verified data.
