Title :
Single package 30-V battery disconnect switch facilitates battery multiplexing in notebook computers
Author :
Williams, Richard K. ; Grabowski, Wayne
Author_Institution :
Siliconix-Temic, Santa Clara, CA, USA
Abstract :
A 30-V bidirectionally blocking battery disconnect switch (BDS) for use in multiplexed-battery multimedia-notebook computers is described and demonstrated, comprising a multichip SO-16 packaged combination of a BiC/DMOS control IC and two back-to-back configured 32 Mcell/in2 P-channel TrenchFETs. The control IC combines ground-referenced 3- to 5-V logic inputs with 2 kV ESD protection, level shifting to a 30 V supply rail, a 4 μsec typical turn-on delay, multichannel 1.5 μsec guaranteed break-before-make (BBM) operation, and 20 V voltage clamping protecting the gates of the highside TrenchFET switches. Total series BDS on-resistance is measured at 30 to 50 mΩ over the 7 to 20 V specified input range consistent with 3 and 4-cell Li ion battery pack design, having 10 nA off-state and 2 μA on-state supply currents, well below the currents required by charge-pumped highside N-channel solutions
Keywords :
computer power supplies; field effect transistor switches; isolation technology; monolithic integrated circuits; notebook computers; power MOSFET; power integrated circuits; secondary cells; 1.5 mus; 10 nA; 2 kV; 2 muA; 3 to 5 V; 30 V; 30 to 50 mohm; 4 mus; 7 to 20 V; BiC/DMOS control IC; ESD protection; Li; Li ion battery pack design; back-to-back P-channel TrenchFETs; battery disconnect switch; battery multiplexing; charge-pumped highside N-channel solutions; gates protection; ground-referenced logic inputs; level shifting; multichip SO-16 packaged combination; multimedia-notebook computers; off-state supply currents; on-state supply currents; series BDS on-resistance; turn-on delay; voltage clamping; Batteries; Clamps; Delay; Electrostatic discharge; Integrated circuit packaging; Logic; Protection; Rails; Switches; Voltage control;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 1998. APEC '98. Conference Proceedings 1998., Thirteenth Annual
Conference_Location :
Anaheim, CA
Print_ISBN :
0-7803-4340-9
DOI :
10.1109/APEC.1998.653974
