TPS51120

The purpose of the 3.3-V and 5-V standby regulators in the TPS51120 controller is to provide high-power and standby regulation for all the downstream circuitry in a notebook computer system. The 5-V and 3.3-V on-board linear regulators have glitch-free switch over function to SMPS and can be kept alive independently during standby state. The 3.3-V linear regulator serves as a standby supply for 3.3 V 'Always On' voltages in the notebook system. The characteristics of this LDO are identical to the 5V LDO except for the switchover voltage.

The maximum input voltage range for the TPS51120 controller is 28 volts.

The TPS51120 controller features include: - Dual current mode synchronous step-down controller with 100-mA standby regulators for notebook system power . - 3.3-V and 5-V 100-mA bootstrapped standby regulators with independent enables mode . - Designed to run directly off a three or four-cell Li-ion battery and provide high-power 5-V and/or 3.3-V standby regulation for all the downstream circuitry in a notebook computer system . - Less than 1% internal reference accuracy . - Selectable D-CAP mode enables fast or transient response of less than 100 ns . - Selectable low ripple current mode . - Selectable PWM-only/auto-skip modes . - Low-side RDS(on) loss-less current sensing . - RSENSE accurate current sense option . - Adaptive on-time control scheme with a supply input voltage range of 4.5 V to 28 V . - Operates almost constant frequency over the entire input voltage range by feed-forwarding input and output voltage into the on-time one-shot timer . TPS51120 is a highly sophisticated dual current mode synchronous step-down controller with various advanced features for efficient power regulation in notebook systems .