FEATURES

Switching Mode Step-Down dc-to-dc

Controller With Fast LDO Controller

Input Voltage Range

Switcher: 4.5 V to 28 V

LDO: 1.1 V to 3.6 V

Output Voltage Range

Switcher: 0.9 V to 3.5 V

LDO: 0.9 V to 2.5 V

Synchronous for High Efficiency

Precision VREF (±1 %)

PWM Mode Control: Max. 500-kHz Operation

High-Speed Error Amplifier

Overcurrent Protection With Temperature

Compensation Circuit

Overvoltage and Undervoltage Protection

Programmable Short-Circuit Protection

APPLICATIONS

Notebook PCs, PDAs

Consumer Game Systems

DSP Application

DESCRIPTION

The TPS5110 provides one PWM-mode synchronous

buck regulator controller (SBRC) and one low drop-out

(LDO) regulator controller. The TPS5110 supports a

low-voltage/high-current power supply for I/O and other

peripherals in modern digital systems. The SBRC of the

TPS5110 automatically adjusts from PWM mode to

SKIP mode to maintain high efficiency under all load

conditions. The LDO controller drives an external

N-channel power MOSFET that realizes fast response

and ultra-low dropout voltage. A unique overshoot

protection circuit prevents a voltage hump at fast load

decreasing transients. The current protection circuit for

SBRC detects the drain-to-source voltage drop across

the low-side and high-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 simplifies the system design and reduces the

external parts count. The LDO controller includes

current-limit protection. Other features, such as

undervoltage lockout, power good, overvoltage,

undervoltage, and programmable short-circuit

protection promote system reliability.