TPS2104

TPS2104, TPS2105 VAUX POWER-DISTRIBUTION SWITCHES features D Dual-Input, Single-Output MOSFET Switch With No Reverse Current Flow (No Parasitic Diodes) D IN1 . . . 250-mΩ, 500-mA N-Channel; 18-µA Supply Current D IN2 . . . 1.3-Ω, 100-mA P-Channel; 0.75-µA Supply Current (VAUX Mode) D Advanced Switch Control Logic D CMOS and TTL Compatible Enable Input D Controlled Rise, Fall, and Transition Times D 2.7 V to 5.5 V Operating Range D SOT-23-5 and SOIC-8 Package D – 40°C to 85°C Ambient Temperature Range D 2-kV Human Body Model, 750-V Charged Device Model, 200-V Machine-Model ESD Protection SLVS235A – SEPTEMBER 1999 – REVISED APRIL 2000 typical applications D Notebook and Desktop PCs D Cell phone, Palmtops, and PDAs D Battery Management TPS2104 IN1 5 V VCC 5V IN2 5 V VAUX Control Signal EN Holdup Capacitor LOAD Figure 1. Typical Dual-Input Single-Output Application description The TPS2104 and TPS2105 are dual-input, single-output power switches designed to provide uninterrupted output voltage when transitioning between two independent power supplies. Both devices combine one n-channel (250 mΩ) and one p-channel (1.3 Ω) MOSFET with a single output. The p-channel MOSFET (IN2) is used with auxiliary power supplies that deliver lower current for standby modes. The n-channel MOSFET (IN1) is used with a main power supply that delivers higher current required for normal operation. Low on-resistance makes the n-channel the ideal path for higher main supply current when power...