TPS66121YBGR - 5V USB-C Sink Power Switch | Texas Instruments
料号： TPS66121YBGR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.4645 | $0.46 |
| 10 | $0.4645 | $4.65 |
| 100 | $0.4645 | $46.45 |
| 500 | $0.4645 | $232.25 |
| 1,000 | $0.4645 | $464.50 |
TPS66121YBGR 概述
A USB-C power switch is a specialized power-management and interface component that controls current flow from a USB-C source toward a downstream system while protecting the sink path from unsafe voltage or fault conditions. The TPS66121 family combines USB-C Power Delivery-related sink functionality with a high-voltage VBUS LDO regulator, allowing a system to maintain operation when the external source is absent or below the normal operating range. Its 5 V output option is intended for devices that require a regulated auxiliary rail during dead-battery operation.
The verified product information identifies the part as a one-channel switch IC with 28 DSBGA balls and a 4.5 V to 5.5 V power range. Distributor listings classify it as an analog switch, while Texas Instruments describes it as a USB-C Power Delivery high-voltage power switch for sinks with a 5 V dead-battery LDO. The -10 °C to +85 °C operating range makes it relevant to systems requiring controlled behavior across an extended industrial temperature span. Exact switch current, RON, fault thresholds, USB-C contract or PD behavior, and regulator accuracy were not included in the supplied verified data and therefore are not asserted here.
Typical application contexts include USB-C-powered embedded systems, industrial controllers, battery-backed equipment, portable instruments, and consumer devices that must distinguish between an externally powered state and a dead-battery state. The integrated 5 V LDO can provide a controlled rail to the device and other system components during dead-battery conditions, according to the Texas Instruments product description. This integration may reduce the need for separate power-path switching and auxiliary supply circuitry, although the actual savings depend on the system architecture and protection requirements.
Designers should begin with the USB-C connector and power-source requirements, then verify the device pinout, ball assignment, exposed-pad treatment, and recommended decoupling against the manufacturer datasheet. Because the supplied data does not include the complete electrical limits or pin map, those details must be checked before layout release. In particular, confirm VBUS voltage, current capability, enable or fault logic, thermal limits, and LDO behavior under load.
This page combines the verified manufacturer description, distributor package data, operating-temperature information, and available sourcing references with explicit uncertainty markers for missing technical details. The result is intended to support early architecture and sourcing decisions while avoiding unsupported claims about electrical performance, safety compliance, or direct replacement parts.
直接替换替代料： TPS66121YBGR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TPS66121YBGR （相同外形与封装尺寸） ——差异在于 Operating Temperature, Product Type.
快速对比工具——选择替代料号进行并排对比：
TPS66121YBGR
✅ 直接替换✓ 有现货
$0.4645 / 个
查看数据手册 →TPS66121
✅ 直接替换📋 参考替代料（不在目录中）
TPS66121YBG
✅ 直接替换📋 参考替代料（不在目录中）
TPS66121YBGTR
✅ 直接替换📋 参考替代料（不在目录中）
TPS66120YBGR
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →TPS66121YBGR 最大额定值与电气特性
| Product Type | USB-C Power Delivery high-voltage power switch for sink |
| Sink Channel Count | 1 channel |
| Operating Voltage Range | 4.5 V to 5.5 V |
| Dead-Battery LDO Output | 5 V |
| 封装 | 28-pin DSBGA (YBG) |
| Package Dimensions | 1.61 mm x 2.81 mm |
| 工作温度 | -10 °C to +85 °C |
| Overtemperature Fault Indication | Supported by TPS6612x family |
TPS66121YBGR 1.61 mm x 2.81 mm 引脚配置指南
TPS66121YBGR（1.61 mm x 2.81 mm 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： TPS66121YBGR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
TPS66121YBGR 适用于 6 应用s: USB-C-Powered Embedded Controller, Battery-Backed Portable Instrument, Industrial USB-C Data and Control Module, Consumer USB-C Accessory, USB-C Service and Diagnostic Interface, Low-Power USB-C Sensor Node.
USB-C-Powered Embedded Controller
TPS66121YBGR fits a compact embedded controller that receives power through a USB-C sink connection and must protect the downstream power path. Its verified 4.5 V to 5.5 V range aligns with the listed operating input range, while the one-channel switch architecture provides a dedicated sink-path function. The integrated 5 V dead-battery LDO can support auxiliary circuitry when the external USB-C source is absent, although the designer must confirm current capability and exact VBUS fault thresholds in the Texas Instruments datasheet before sizing the load.
推荐
Battery-Backed Portable Instrument
The TPS66121YBGR is applicable to portable instruments that use USB-C for charging or external power but must continue operating from a dead-battery state. The Texas Instruments description specifically identifies a 5 V dead-battery LDO for supplying the device and other system components during that condition. This integration can simplify auxiliary rail sequencing, provided that the instrument's standby current remains within the regulator and switch limits verified from the datasheet. Protection, thermal, and battery-source behavior must be evaluated together rather than assumed from the 5 V label.
推荐
Industrial USB-C Data and Control Module
TPS66121YBGR can be considered for an industrial USB-C data or control module requiring a defined sink power switch and an auxiliary 5 V rail. The verified -10 °C to +85 °C operating range is useful for environments beyond consumer-temperature expectations, but it is not a substitute for full environmental qualification. The design should verify conducted and ESD requirements, fault recovery, input overvoltage behavior, and thermal performance at the highest expected load. The 28-ball DSBGA also requires careful ball assignment and assembly planning.
推荐
Consumer USB-C Accessory
A USB-C accessory can use TPS66121YBGR when it needs a controlled sink input and a 5 V rail that remains available during dead-battery conditions. The single-channel switch structure is intended for a defined power path rather than a multi-port source or charger controller. Engineers should compare the accessory's maximum current, cable-drop allowance, source behavior, and enclosure temperature with the manufacturer limits before layout. If the accessory requires high-current charging, USB-PD negotiation, or multiple voltage rails, a different power-management architecture may be more appropriate.
推荐
USB-C Service and Diagnostic Interface
TPS66121YBGR is relevant to service and diagnostic interfaces that need a predictable power path when connected to a USB-C host and a safe fallback state when the host is unavailable. The integrated 5 V dead-battery function can help keep local control logic operational during an external-power fault or disconnected condition. The implementation must still include the required input protection, connector orientation handling, and fault indication expected by the system. The verified source data does not specify diagnostic thresholds or USB-C contract behavior, so those functions require direct datasheet verification.
推荐
Low-Power USB-C Sensor Node
The TPS66121YBGR can be evaluated for a low-power sensor node that receives external USB-C power while maintaining a controlled auxiliary rail for sensing and communications. Its 4.5 V to 5.5 V listed operating range is relevant to a conventional 5 V USB power environment, and the dead-battery LDO provides a defined fallback when the host does not supply power. The node designer must ensure that the regulator, switch, and cable path can support the sensor peak load without violating thermal or current limits. Low-power operation does not eliminate the need to validate USB-C source and ESD requirements.
推荐
推荐产品汇总
工程参考数据： TPS66121YBGR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TPS66121 | TPS66121YBG | TPS66121YBGTR | TPS66120YBGR |
|---|---|---|---|---|---|
| Package | 28-pin DSBGA (YBG) | 28-pin DSBGA (YBG), package confirmed by family context | 28-pin DSBGA (YBG) | 28-pin DSBGA (YBG) | 28-pin DSBGA (YBG), adjacent family package confirmation required |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | USB-C PD sink power switch with 5 V dead-battery LDO | USB-C PD sink power switch with dead-battery LDO | TPS66121 family identifier | TPS66121 family identifier | Adjacent TPS6612x-family sink device; exact configuration requires verification |
关键差异点
- Integration of USB-C sink power-path control with dead-battery support （对比 TPS66120YBGR)
- Verified 5 V operating-class input range （对比 TPS66121YBGTR)
- Defined 28-ball YBG package target （对比 TPS66121)
- Overtemperature fault support at family level （对比 TPS66121)
设计说明
Verify the complete VBUS power-path budget against the TPS66121YBGR datasheet before selecting PCB copper, connector ratings, and protection components. The verified distributor data gives a 4.5 V to 5.5 V operating range and identifies a 5 V dead-battery LDO, but it does not provide switch current, RON, or LDO output-current limits. Size the upstream and downstream paths from confirmed ratings rather than from the package name or nominal 5 V rail.
Treat the 28-ball DSBGA YBG footprint as a high-density assembly item and follow the manufacturer's land pattern, ball map, solder-mask, and assembly recommendations. Place input, VBUS, and auxiliary-rail decoupling close to the relevant balls, and confirm whether an exposed pad or thermal construction is required. The supplied data does not contain the complete pin map, so no pin-specific pad or routing recommendation should be treated as verified.
Do not substitute a generic USB-C power switch solely because the input voltage appears similar. A valid replacement must match the YBG footprint, ball functions, dead-battery LDO behavior, sink direction, fault handling, current rating, and thermal limits. The cross-reference search supplied no independently verified drop-in replacement, so any alternate part should remain blocked until its manufacturer documents pin-to-pin compatibility.
Calculate worst-case dissipation after confirming the switch resistance and regulator limits from the manufacturer datasheet. Pay particular attention to repeated USB-C connection transitions, sustained dead-battery operation, and maximum ambient temperature. The verified range extends to +85 °C, but no thermal resistance, maximum junction temperature, or power-loss graph was supplied, so no numerical thermal estimate is presented here.
合规信息
No verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements were supplied. Confirm current compliance documentation on the Texas Instruments product page or manufacturer quality documentation.
