US 9,813,053 B2
Gate capacitance control in a load switch
Sungho Beck, Plano, TX (US); and Johnny Klarenbeek, Dallas, TX (US)
Assigned to Texas Instruments Incorporated, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Jun. 30, 2016, as Appl. No. 15/198,618.
Claims priority of provisional application 62/298,213, filed on Feb. 22, 2016.
Prior Publication US 2017/0244403 A1, Aug. 24, 2017
Int. Cl. H03B 1/00 (2006.01); H03K 17/081 (2006.01); H02M 3/07 (2006.01)
CPC H03K 17/08104 (2013.01) [H02M 3/07 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A switch for controlling a power supply comprising:
a first transistor having a drain and a source connected between VIN and VOUT and a gate connected to be driven to a first voltage that is greater than VIN;
an external capacitor operable, when connected to the gate of the first transistor, to control a rise time of VOUT; and
a circuit coupled to the gate of the first transistor and to the external capacitor, the circuit connected to couple the external capacitor to the gate of the first transistor responsive to an enable signal turning on and to uncouple the external capacitor from the gate of the first transistor responsive to the voltage on the gate reaching the first voltage.