TPS2140是TI公司的一款含LDO的开关产品，TPS2140是用于高功率 USB 外设、具有双路电流限制的可调节 LDO Plus 3.3V 开关，本页介绍了TPS2140的产品说明、应用、特性等，并给出了与TPS2140相关的TI元器件型号供参考。
TPS2140 - 用于高功率 USB 外设、具有双路电流限制的可调节 LDO Plus 3.3V 开关 - 含LDO的开关 - USB电源和充电端口控制器 - TI公司（Texas Instruments，德州仪器）
The TPS2140/41/50/51 is a USB 1.0 and 2.0 Specification-compatible IC containing a dual-current-limiting power switch and an adjustable low dropout regulator (LDO). Both the switch and LDO limit inrush current by controlling the turnon slew rate. The unique dual-current-limiting feature of the switch allows USB peripherals to utilize high-value capacitance at the output of the switch, while keeping the inrush current low. During turn on, the switch limits the current delivered to the capacitive load to less than 100 mA. When the output voltage from the switch reaches about 93% of the input voltage, the switch power good output goes high, and the switch current limit increases to 800mA (minimum), at which point higher current loads can be turned on. The higher current limit provides short circuit protection while allowing the peripheral to draw maximum current from the USB bus.
The switch and LDO function independently, providing flexibility in DSP applications requiring separate core and I/O voltages. For example, in a DSP application operating from a 3.3-V rail, the LDO can supply the DSP core voltage down to 0.9 V, while the switch powers the 3.3-V (typical) DSP I/O supply. If supply sequencing is required, the LDO power good output can be used to enable the switch.
- Complete Power Management Solution for USB High-Power Peripherals
- 250 mA Low-Dropout Regulator (LDO) With Enable and 325 mA (Typ) Current Limit
- LDO Supports 2.7 V to 5.5 V VIN and 0.9 V to 3.3 V Adjustable VOUT
- 40 m (Typ) High-Side MOSFET With Dual Current Limit
- Undervoltage Lockout and Power Good for LDO and Switch
- CMOS- and TTL-Compatible Enable Inputs
- 85 µA (Typ) Supply Current
- 5 µA (Typ) Standby Supply Current
- Available in 14-Pin HTSSOP (PowerPAD™)
- –40°C to 85°C Ambient Temperature Range
- Alternative to TPS2148/58 3.3-V LDO With 3.3-V Switch and 5-V Switch
- APPLICATIONS
- High-Power USB™ Peripherals
- ADSL Modems
- Digital Still and PC Cameras
- Zip Drives
- Speakers
- DSP Sequencing
- High-Power USB™ Peripherals
PowerPAD is a trademark of Texas Instruments. USB is a trademark of Universal Serial Bus Association.
