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TPS22949AYZPR Datasheet(PDF) 1 Page - Texas Instruments |
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TPS22949AYZPR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 28 page TPS22949 TPS22949A www.ti.com SLVS908C – FEBRUARY 2009 – REVISED JANUARY 2010 CURRENT-LIMITED LOAD SWITCH WITH LOW NOISE REGULATION CAPABILITY Check for Samples: TPS22949, TPS22949A 1 FEATURES DESCRIPTION • Integrated Current Limiter – Input Voltage Range: 1.62 V to 4.5 V The TPS22949 and TPS22949A are devices that provides protection to systems and loads in – Low ON-Resistance high-current conditions. The device contains a – rON = 300-mΩ at VIN = 4.5 V 500-m Ω current-limited P-channel MOSFET that can – rON = 350-mΩ at VIN = 3.3 V operate over an input voltage range of 1.62 V to 4.5 V as well as a low-dropout (LDO) regulator with a – rON = 400-mΩ at VIN = 2.5 V fixed output voltage of 1.8 V. – rON = 600-mΩ at VIN = 1.8 V The switch is controlled by an on/off input (EN1), – Integrated 100-mA Minimum Current Limit which is capable of interfacing directly with – Undervoltage Lockout low-voltage control signals. When the switch current – Fast-Current Limit Response Time reaches the maximum limit, the TPS22949/TPS22949A operates in a – Integrated Fault Blanking and Auto Restart constant-current mode to prohibit excessive currents • Stable Without Current Limiter Output from causing damage. If the constant current Capacitor (TPS22949A Only) condition still persists after 12 ms, these devices shut • Integrated Low-Noise RF LDO off the switch and pull the fault signal pin (OC) low. The TPS22949/TPS22949A has an auto-restart – Input Voltage Range: 1.62 V to 4.5 V feature that turns the switch on again after 70 ms if – Low Noise: 50 μVrms (10 Hz to 100 kHz) the EN1 pin is still active. – 80-dB VIN PSRR (10 Hz to 10 kHz) The output of the current limiter is internally – Fast Start-Up Time: 130 μs connected to a RF low-dropout (LDO) regulator that – Low Dropout 100 mV at Iload =100 mA offers good ac performance with very low ground current, good power-supply rejection ratio (PSRR), – Integrated Output Discharge low noise, fast start-up, and excellent line and load – Stable With 2.2- μF Output Capacitor transient response. The output of the regulator is • 1.8-V Compatible Control Input Threshold stable with ceramic capacitors. This LDO uses a precision voltage reference and feedback loop to • ESD Performance Tested Per JESD 22 achieve overall accuracy of 2% over all load, line, – 3500-V Human-Body Model process, and temperature variations. (A114-B, Class II) The TPS22949A integrates additional internal – 1000-V Charged-Device Model circuitry that increases the current limit of the switch (C101) during the power-up sequence. This feature allows • Tiny 8-Terminal YZP Package (1.9 mm × the TPS22949A to operate without a storage 0.9 mm, 0.5-mm Pitch, 0.5-mm Height) and capacitor at the input of the LDO. SON-8 (DRG) 3.0 mm × 3.0 mm The TPS22949 and TPS22949A are available in a space-saving 8-terminal WCSP (YZP) or in a 8-pin APPLICATIONS SON package (DRG). Both are characterized for • Fingerprint Module Protection operation over the free-air temperature range of • Portable Consumer Electronics –40°C to 85°C. • Smart Phone • Notebooks • Control Access Systems 1 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. PRODUCTION DATA information is current as of publication date. Copyright © 2009–2010, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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