FEATURES
High Efficiency − No Current Sense Resistor
Required, RDS(on) Overcurrent Detection with
Temperature Compensation
Adjustable Output Voltage Down to 0.9 V
Voltage-Mode PWM Control: Maximum
500-kHz Operation
180° Out-of-Phase Control
Individual Standby and Soft-Start for Each
Channel − Easy Power Sequencing
Overvoltage and Undervoltage Protection
Built-In Boot-Strap Diode
Built-In 5-V Linear Regulator
Accurate ± 1% 0.85-V Reference

APPLICATIONS
Consumer Game Systems
DSP Applications
Digital Set-Top Box
VGA and Sound Cards

DESCRIPTION
The TPS5124 is dual independent high efficiency
synchronous step-down controller. It supports a
low-voltage/high-current power supply applica−
tions that use either a 5-V or 12-V bus voltage.
Since both controllers of the TPS5124 operate
180 degree out-of-phase, the input current ripple
is minimized resulting in a smaller input
capacitance and reduced power supply cost.
The current protection circuit detects the
drain-to-source voltage drop across the high-side
and low-side power MOSFET while it is
conducting. Also, the current protection circuit has
a temperature coefficient to compensate for the
RDS(on) variation of the MOSFET. This
resistor-less current protection and built-in boost
diode simplify the system design and reduces the
external parts count. Other features such as
undervoltage lockout, overvoltage, undervoltage,
and programmable short-circuit protection
promote system reliability.