PS2151

Product Summary

The PS2151 is a USB 1.0 and 2.0 Specification-compatible IC containing a dual-currentlimiting 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. It is ideal for: (1)High-Power USB Peripherals: ADSL Modems; Digital Still and PC Cameras; Zip Drives; Speakers.; (2)DSP Sequencing.

Parametrics

PS2151 absolute maximum ratings: (1)Input voltage range for bus switch and LDO: VI(SW_IN): –0.3 V to 6 V; VI(LDO_IN): –0.3 V to 6 V; (2)Output voltage range for bus switch and LDO:VO(SW_OUT): –0.3 V to 6 V; VO(LDO_OUT): –0.3 V to 6 V; (3)Input voltage range for pulldown transistors: VI(SW_PLDN),VI(LDO_PLDN): –0.3 V to 6 V; (4)Logic input/output voltage range: VI(SW_EN)or VI(/SW_EN), VI(LDO_EN), VI(ADJ), VI(SW_PG); VI(LDO_PG): –0.3 V to 6 V; (5)Continuous total power dissipation: See Dissipation Rating Table;; (6)Output current for bus switch and LDO: IO(SW_OUT): Internally Limited IO(LDO_OUT): Internally Limited; (7)Sink current for pulldown switches: II(SW_PLDN): 0 mA to 30 mA; II(LDO_PLDN): 0 mA to 30 mA; (8)Output current for logic outputs: IO(SW_PG): –10 mA to 10 mA; (9)IO(LDO_PG): 0 mA to 10 mA; (10)Operating virtual junction temperature range, TJ: –40°C to 125°C; (11)Storage temperature range, Tstg: –65°C to 150°C; (12)Lead temperature 1,6 mm (1/16 inch)from case for 10 seconds: 260°C.

Features

PS2151 features: (1)Complete Power Management Solution for USB High-Power Peripherals; (2)250 mA Low-Dropout Regulator (LDO)With Enable and 325 mA (Typ)Current Limit; (3)LDO Supports 2.7 V to 5.5 V VIN and 0.9 V to 3.3 V Adjustable VOUT; (4)40 mΩ (Typ)High-Side MOSFET With Dual Current Limit; (5)Undervoltage Lockout and Power Good for LDO and Switch; (6)CMOS- and TTL-Compatible Enable Inputs; (7)85 μA (Typ)Supply Current; (8)5 μA (Typ)Standby Supply Current; (9)Available in 14-Pin HTSSOP (PowerPAD); (10)–40°C to 85°C Ambient Temperature Range; (11)Alternative to TPS2148/58 3.3-V LDO With 3.3-V Switch and 5-V Switch.

Diagrams