The TPS51120RHBTG4 is a Dual Current Mode Synchronous Step-down Controller with 100mA standby reg for notebook system power. It is a full featured controller designed to run directly off a three- or four-cell Li-ion battery and provide high-power and 5 and/or 3.3V standby regulation for all the downstream circuitry in a notebook computer system. High-current 100mA, 5 or 3.3V on-board linear regulators have glitch-free switch over function to SMPS and can be kept alive independently during standby state. The pseudo-constant frequency adaptive on-time control scheme supports full range of current mode operation including simplified loop compensation, ceramic output capacitors as well as seamless transition to reduced frequency operation at light-load condition. Optional D-CAP mode operation optimized for SP-CAP or POSCAP output capacitors allows further reduction of external compensation parts. Dynamic UVP supports VIN line sag without latch off by hitting 5-V UVP.
3.3 and 5V 100mA Bootstrapped standby regulators with independent enables
Selectable D-CAP? mode enables fast transient response less than 100ns
Selectable low ripple current mode
Less than 1% internal reference accuracy
Selectable PWM-only/auto-skip modes
Low-side RDS (ON) loss-less current sensing
RSENSE accurate current sense option
Internal soft-start and integrated VOUT discharge transistors
(EN)
