BQ21061YFPT - 500mA 1-Cell Linear Charger w/ 10nA Ship Mode | TI
Артикул: BQ21061YFPT ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $2.5 | $2,50 |
| 10 | $2.25 | $22,50 |
| 100 | $1.95 | $195,00 |
| 500 | $1.65 | $825,00 |
| 1.000 | $1.4 | $1.400,00 |
BQ21061YFPT Обзор
A linear battery charger is a power management subcircuit which regulates charging current/voltage into a single-cell Li-Ion/Li-Polymer battery using a series pass element. Within the broader system taxonomy, a linear charger sits below a switching charger and below a power management IC, providing the safest and lowest-EMI charging path for small batteries at the cost of higher conduction dissipation. The BQ21061 specifically targets ultra-low-power IoT devices by combining charger + power-path + LDO in a single die, eliminating the need for a separate PMIC in simple wearable designs.
Key features include a 10-nA ship mode quiescent current that dramatically extends shelf life on the warehouse shelf and during end-user storage, I2C programmability for charge current, input current limit, charger enable, and safety timers, integrated power-path with PMID regulation that allows system operation even with a deeply discharged or absent battery, and an integrated LDO that can supply low-voltage always-on rails for the host MCU. The 20-ball DSBGA package measures approximately 1.6 mm x 2.0 mm, enabling direct placement in space-constrained wearable form factors.
The BQ21061 is engineered around a low-Rdson pass transistor architecture with an integrated sense resistor, providing high-accuracy charge current regulation and thermal management. Thermal regulation automatically reduces charge current at elevated die temperatures, protecting the device and battery in thermally constrained designs. The I2C interface allows host processors to dynamically adjust parameters and read status flags including charging state, fault conditions, and battery voltage.
Typical applications include TWS earbuds charging cases, fitness bands, smart watches, IoT sensor nodes, Bluetooth trackers, and medical wearables such as continuous glucose monitors and pulse oximeters. Its combination of low quiescent current, small package, and integrated power-path makes it ideal for battery-powered products that must run for months on a single charge. When integrating this device, designers should follow TI reference layout guidance for the DSBGA thermal pad to ensure adequate heat dissipation during fast-charge at high VIN-VBAT differentials.
Аналоги без доработки для BQ21061YFPT — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с BQ21061YFPT (тот же форм-фактор и посадочное место) — отличается по Maximum Charge Current, Mounting Type, Package, Topology.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
BQ21061YFPR
✅ Прямая замена✓ В наличии
$0.86 / шт.
Открыть даташит →BQ21062YFPR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
BQ25185YFPR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MCP73831T-2ACI/OT
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LTC4065EDC
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
BQ21061YFPT Характеристики
| Топология | Linear Battery Charger with Power-Path and LDO |
| Cell Chemistry | Lithium Ion / Lithium Polymer (1-cell) |
| Battery Voltage | 4.2 V |
| Maximum Charge Current | 500 mA |
| Programmable Charge Current | Up to 500 mA via I2C |
| Ship Mode Quiescent Current | 10 nA |
| PMID Regulation | VBAT + 225 mV |
| Интерфейс | I2C |
| Диапазон рабочих температур | -40 C to +85 C |
| Корпус | 20-DSBGA (YFP) |
| Package Size | Approx. 1.6 mm x 2.0 mm |
| Тип монтажа | Surface Mount |
| Статус RoHS | Compliant |
| Integrated LDO | Yes |
| Safety Timer | Programmable |
Конфигурация выводов BQ21061YFPT
| Контакт A1 | VIN — Charger input supply (USB or DC adapter) |
| Контакт A2 | PMID — Power-path regulated system voltage (VBAT + 225 mV) |
| Контакт A3 | BAT — Battery connection |
| Контакт A4 | SYS — System output from PMID/LDO |
| Контакт B1 | IN — Input supply sense |
| Контакт B2 | LDO — LDO output (programmable via I2C) |
| Контакт B3 | GND — Ground |
| Контакт B4 | CE — Charge enable / status |
| Контакт C1 | SDA — I2C data |
| Контакт C2 | SCL — I2C clock |
| Контакт C3 | INT — Interrupt output (open-drain) |
| Контакт C4 | TS — Battery temperature sense (10k NTC) |
| Контакт D1 | PGOOD — Power good indicator |
| Контакт D2 | VLIM — Input current limit set |
| Контакт D3 | ISET — Charge current set |
| Контакт D4 | GND — Ground |
| Контакт E1 | NC — Not connected (per datasheet) |
| Контакт E2 | NC — Not connected (per datasheet) |
| Контакт E3 | NC — Not connected (per datasheet) |
| Контакт E4 | NC — Not connected (per datasheet) |
Типичное применение
BQ21061YFPT подходит для 6 применениеs: TWS Earbud Charging Cases, Fitness Bands and Smart Watches, IoT Sensor Nodes, Bluetooth Trackers, Medical Wearables (CGM, Pulse Oximeter), Smart Home Sensor Hubs.
TWS Earbud Charging Cases
The BQ21061YFPT is well-suited for TWS earbud charging cases because it integrates a 500-mA linear charger, power-path, and LDO in a 1.6 mm x 2.0 mm DSBGA package - critical for the tiny case PCB. The 10-nA ship mode prevents battery drain during months of retail shelf storage. The PMID regulator allows the case electronics to operate even when the internal battery is fully depleted or absent, providing instant user feedback.
Рекомендуется
Fitness Bands and Smart Watches
For fitness bands and smart watches, the BQ21061YFPT's 500-mA charge current supports reasonably fast top-up charging from a USB or wireless input, while its 10-nA ship mode extends battery shelf life before first use. The integrated power-path and LDO eliminate the need for separate power-path and always-on LDO ICs, reducing the wearable PCB footprint by 30-50% compared to discrete charger + LDO designs.
Рекомендуется
IoT Sensor Nodes
IoT sensor nodes benefit from the BQ21061YFPT's ultra-low 10-nA ship mode, which lets coin-cell or Li-Po battery sensors sit dormant on the shelf or in the field for years without losing charge. The I2C interface allows the host MCU to dynamically adjust charge parameters and read charging status, while the integrated LDO provides a clean always-on rail for the MCU and sensors. Linear topology adds no switching noise that could interfere with sensitive analog sensors.
Рекомендуется
Bluetooth Trackers
Bluetooth trackers such as item finders rely on the BQ21061YFPT's combination of low quiescent current, small package, and integrated power-path to maximize battery life in a compact form factor. The 10-nA ship mode preserves battery during shipping and shelf time, while the integrated PMID allows the BLE radio and accelerometer to run directly from PMID during the charging phase. Designers can place the IC on a flex PCB inside a CR2032-sized enclosure.
Рекомендуется
Medical Wearables (CGM, Pulse Oximeter)
Medical wearables including continuous glucose monitors and pulse oximeters benefit from the BQ21061YFPT's low-noise linear topology, which eliminates switching noise that could couple into sensitive analog front-end circuits. The I2C programmability allows the medical device to log charging events and battery health for regulatory traceability, while the 10-nA ship mode extends shelf life of disposable or rarely-used medical accessories. The DSBGA package fits inside the small adhesive patch form factor.
Рекомендуется
Smart Home Sensor Hubs
Smart home sensor hubs for door/window sensors, motion detectors, and leak sensors benefit from the BQ21061YFPT's 10-nA ship mode that enables multi-year battery life on a single CR123A or Li-Po cell. The integrated PMID and LDO simplify the BOM, while the I2C interface allows the host MCU to monitor charging status and report battery health over BLE or Zigbee. The linear topology adds zero EMI, ideal for noise-sensitive wireless designs.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для BQ21061YFPT — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | BQ21061YFPR | BQ21062YFPR | BQ25185YFPR | MCP73831T-2ACI/OT | LTC4065EDC |
|---|---|---|---|---|---|---|
| Package | 20-DSBGA (YFP) | 20-DSBGA (YFP) - same | 20-DSBGA (YFP) - same | 20-DSBGA (YFP) - same | SOT-23-5 - different but drop-in SMD | DFN-6 - different but drop-in SMD |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Microchip Technology | Analog Devices |
| Charge Current (max) | 500 mA | 500 mA | 500 mA | 300 mA (lower) | 500 mA | 500 mA |
| Ship Mode Current | 10 nA | 10 nA | 10 nA | <100 nA | No ship mode | No ship mode |
| Battery Regulation Voltage | 4.2 V | 4.2 V | 4.2 V | 4.2 V | 4.2 V | 4.2 V |
| Interface | I2C | I2C | I2C | I2C | Standalone (no I2C) | Standalone (no I2C) |
| Integrated Power-Path | Yes (VBAT + 225 mV) | Yes | Yes | Yes | No | No |
| Integrated LDO | Yes | Yes | Yes | Yes | No | No |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Approx. Unit Price (1-pc) | $2.50 | $2.50 | $2.50 | $2.20 | $0.60 | $1.80 |
Ключевые отличия
- Integrates charger + power-path + LDO in 20-DSBGA (против MCP73831T-2ACI/OT)
- 10-nA ship mode vs no ship mode (против LTC4065EDC)
- I2C programmability vs standalone operation (против MCP73831T-2ACI/OT)
Заметки по проектированию
At VIN=5 V, VBAT=3.6 V, and 500-mA charge current, the BQ21061YFPT dissipates approximately 0.7 W as a linear regulator. With the DSBGA-20 package's small thermal pad, the junction temperature rise must be calculated for the application's max ambient temperature. Estimated: at 0.7 W into the DSBGA thermal pad on a standard 1 oz 4-layer PCB, expect 50-80 C junction temperature rise. Use the largest possible copper area under the thermal balls and add via-fanling to inner layers to minimize thermal resistance.
For the BQ21061YFPT DSBGA-20 package, use TI's recommended NSMD land pattern with via-in-pad or via-near-pad stitching directly under the thermal balls. Per the manufacturer datasheet, place the input capacitor (1-10 uF) as close as possible to the VIN ball, the BAT capacitor as close as possible to the BAT ball, and the PMID capacitor as close as possible to the PMID ball. Use 0201 or 0402 ceramic capacitors to minimize loop area and reduce EMI on the high-current paths.
Common pitfalls with the BQ21061YFPT include: (1) omitting the PMID capacitor which can cause system resets during load transients; (2) connecting the TS (battery NTC sense) pin incorrectly - leave it floating if no NTC is used but the device may flag a fault; (3) exceeding the absolute max VIN rating; (4) misprogramming the I2C current-limit register causing input voltage collapse. According to the TI datasheet, always verify I2C register defaults and the PMID current limit before enabling charge.
Design the power-path so that the system load is supplied from PMID, not from BAT. According to the TI BQ21061 datasheet, PMID is regulated to VBAT + 225 mV, so when the charger is connected, the system draws power from the charger rather than the battery, extending battery life. During charging, system load transients up to PMID current rating are supported without battery discharge. Calculate the worst-case PMID current rate as I(PMID) = I(CHG) + I(SYS) and verify against the PMID current limit register.
Информация о соответствии
RoHS and REACH compliant per TI product page. Not AEC-Q100 qualified (consumer/IoT grade). Lead-free and halogen-free per TI packaging materials disclosure.
