US 12,283,960 B2
Low-power fast-transient large current-sink with dynamic biasing
Adrian Lin, Austin, TX (US)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on Apr. 26, 2023, as Appl. No. 18/307,527.
Prior Publication US 2024/0364320 A1, Oct. 31, 2024
Int. Cl. H03K 5/24 (2006.01); H03K 17/16 (2006.01); H03K 17/687 (2006.01)
CPC H03K 5/2481 (2013.01) [H03K 17/162 (2013.01); H03K 17/6871 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A current-sink comprising:
a latch system including a latch system input coupled to and operable to receive a transient load current signal indicating a transient load current in a load current of a load coupled to a floating-rail, and a latch system output, wherein the latch system comprises:
a comparator having a non-inverting input coupled to a floating-rail reference voltage (VSSHV_REF), and an inverting input coupled to a floating-rail voltage (VSSHV) on the floating-rail, and a comparator output, and
a set-reset (S-R) latch having a set input coupled to and operable to receive the transient load current signal from the latch system input, a reset input coupled to the comparator output, and a latch output coupled to the latch system output; and
a current sinking switch including a gate coupled to the latch system output, a first source/drain (S/D) terminal coupled to the floating-rail, and a second S/D terminal coupled to ground, the current sinking switch operable to sink at least a portion of the transient load current from the load to provide a stable floating-rail voltage (VSSHV) on the floating-rail.