Independent Dual-Outputs Operate 180°

Out of Phase

Wide Input Voltage Range: 4.5-V – 28-V

Adjustable Output Voltage Down to 0.9 V

Pin-Selectable PWM/SKIP Mode for High

Efficiency Under Light Loads

Synchronous Buck Operation Allows up to

95% Efficiency

Separate Standby Control and Overcurrent

Protection for Each Channel

Programmable Short-Circuit Protection

Low Supply (1 mA) and Shutdown (1 nA)

Current

Power Good Output

High-Speed Error Amplifiers

Sequencing Easily Achieved by Selecting

Softstart Capacitor Values.

5-V Linear Regulator Power Internal IC

Circuitry

30-Pin TSSOP Packaging

description

The TPS5120 is a dual channel, high-efficiency synchronous buck controller where the outputs run 180 degrees

out of phase, which lowers the input current ripple, thereby reducing the input capacitance cost. The PWM/SKIP

pin allows the operating mode to switch from PWM mode to skip mode under light load conditions. The skip

mode enables a lower operating frequency and shortens the pulse width to the low-side MOSFET, increasing

the efficiency under light load conditions. These two modes, along with synchronous-rectifier drivers, dead time,

and very low quiescent current, allow power to be conserved and the battery life to be extended under all load

conditions. The 1.5 A (typical) high-side and low-side MOSFET drivers on-chip are designed to drive less

expensive N-channel MOSFETs. The resistorless current protection and fixed high-side driver voltage simplify

the power supply design and reduce the external parts count. Each channel is independent, offering a separate

controller, overcurrent protection, and standby control. Sequencing is flexible and can be tailored by choosing

different softstart capacitor values. Other features, such as undervoltage lockout, power good, overvoltage,

undervoltage, and programmable short-circuit protection promote system reliability.