±1% Reference Over Full Operating

Temperature Range

Synchronous Rectifier Driver for >90%

Efficiency

Fixed Output Voltage Options of 1.5 V,

1.8 V, 2.5 V, and 3.3 V

User-Selectable Hysteretic-Type Control

Low Supply Current . . . 3 mA Typ

11.4-V to 13-V Input Voltage Range, VCC

Power Good Output

Programmable Soft-Start

Overvoltage/Overcurrent Protection

Active Deadtime Control

description

The TPS5615 family of synchronous-buck regulator controllers provides an accurate supply voltage to DSPs.

The output voltage is internally set by a resistive divider with an accuracy of 1% over the full operating

temperature range. A hysteretic controller with user-selectable hysteresis is used to dramatically reduce

overshoot and undershoot caused by load transients. Propagation delay from the comparator inputs to the

output drivers is less than 250 ns. Overcurrent shutdown and crossover protection for the output drivers

combine to eliminate destructive faults in the output FETs. PWRGD monitors the output voltage and pulls the

open-collector output low when the output drops below 93% of the nominal output voltage. An overvoltage circuit

disables the output drivers if the output voltage rises 15% above the nominal value. The inhibit pin can be used

to control power sequencing. Inhibit and undervoltage lockout assures that the 12-V supply voltage and system

supply voltage (5 V or 3.3 V) are within proper operating limits before the controller starts. The output driver

circuits include 2-A drivers with internal 8-V gate-voltage regulators that can easily provide sufficient power for

today’s high-powered DSPs. The high-side driver can be configured either as a ground-referenced driver or as

a floating bootstrap driver. The TPS5615 family is available in a 28-pin TSSOP PowerPad™ package. It operates

over a junction temperature range of 0°C to 125°C.