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TPS2151IPWP-TPS2151IPWPR
Adjustable LDO Plus 5V Switch with Dual Current Limit for High Power USB Peripherals
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FEATURES 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 V OUT 40 mΩ (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
DESCRIPTIONThe 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 turnon, 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.
AVAILABLE OPTIONSNOTE: All options available taped and reeled. Add an R suffix (e.g., TPS2140IPWPR)
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments. USB is a trademark of Universal Serial Bus Association.
