TPS22949
- Integrated Current Limiter
- Input Voltage Range: 1.62 V to 4.5 V
- Low ON-Resistance
- rON = 300-mΩ at VIN = 4.5 V
- rON = 350-mΩ at VIN = 3.3 V
- rON = 400-mΩ at VIN = 2.5 V
- rON = 600-mΩ at VIN = 1.8 V
- Integrated 100-mA Minimum Current Limit
- Undervoltage Lockout
- Fast-Current Limit Response Time
- Integrated Fault Blanking and Auto Restart
- Stable Without Current Limiter Output Capacitor
(TPS22949A Only) - Integrated Low-Noise RF LDO
- Input Voltage Range: 1.62 V to 4.5 V
- Low Noise: 50 µVrms (10 Hz to 100 kHz)
- 80-dB VIN PSRR (10 Hz to 10 kHz)
- Fast Start-Up Time: 130 µs
- Low Dropout 100 mV at Iload =100 mA
- Integrated Output Discharge
- Stable With 2.2-µF Output Capacitor
- 1.8-V Compatible Control Input Threshold
- ESD Performance Tested Per JESD 22
- 3500 V Human Body Model
(A114-B, Class II) - 1000 V Charged Device Model
(C101)
- 3500 V Human Body Model
- Tiny 8-Terminal YZP Package (1.9 mm × 0.9 mm,
0.5-mm Pitch, 0.5-mm Height) and WSON-8
(DRG) 3.0 mm × 3.0 mm
The TPS22949 and TPS22949A are devices that provide protection to systems and loads in high-current conditions. The device contains a 500-mΩ current-limited P-channel MOSFET that can operate over an input voltage range of 1.62 V to 4.5 V as well as a low-dropout (LDO) regulator with a fixed output voltage of 1.8 V.
The switch is controlled by an on/off input (EN1), which can interface directly with low-voltage control signals. When the switch current reaches the maximum limit, the TPS22949/TPS22949A operates in a constant-current mode to prohibit excessive currents from causing damage. If the constant current condition persists after 12 ms, these devices shut off the switch and pull the fault signal pin (OC) low. The TPS22949/TPS22949A has an auto-restart feature that turns the switch on again after 70 ms if the EN1 pin is still active.
The output of the current limiter is internally connected to an RF low-dropout (LDO) regulator that offers good AC performance with very low ground current, good power supply rejection ratio (PSRR), low noise, fast start-up, and excellent line and load transient response. The output of the regulator is stable with ceramic capacitors. This LDO uses a precision voltage reference and feedback loop to achieve overall accuracy of 2% over all load, line, process, and temperature variations.
The TPS22949A integrates additional internal circuitry that increases the current limit of the switch during the power-up sequence. This feature allows the TPS22949A to operate without a storage capacitor at the input of the LDO.
The TPS22949 and TPS22949A are available in a space-saving 8-terminal WCSP (YZP) or in an 8-pin WSON package (DRG). Both devices are characterized for operation over the free-air temperature range of –40°C to 85°C.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | TPS22949x Current-Limited Load Switch With Low Noise Regulation Capability datasheet (Rev. D) | PDF | HTML | 2015年 6月 30日 |
| Application note | Load Switch Thermal Considerations (Rev. A) | 2018年 10月 11日 | ||
| Application note | Basics of Load Switches (Rev. A) | 2018年 9月 5日 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 2018年 6月 25日 | ||
| Application note | Selecting a Load Switch to Replace a Discrete Solution | 2017年 4月 30日 | ||
| Application note | Timing of Load Switches | 2017年 4月 27日 | ||
| Application note | Managing Inrush Current (Rev. A) | 2015年 5月 28日 |
設計與開發
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PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WSON (DRG) | 8 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點