TLF50281EL

Buck Regulator

Data Sheet

11

Rev. 1.01, 2013-04-30

Input undervoltage shutdown: If the input voltage is below the input undervoltage shutdown threshold

V

device will shut down.

Output overvoltage protection: If the output voltage exceeds the PFM threshold the device will switch from PWM

to PFM. Pulses will then be generated only depending on the value of the output voltage

V

Soft start function: An integrated soft start function of duration

t

After an over-temperature shutdown the regulator always restarts with a soft start.

Over-temperature shutdown: An internal temperature sensor detects the temperature of the device. It will be

switched off if the junction temperature exceeds the over temperature shutdown threshold

T

certain hysteresis

T

Biasing:

The internal biasing is taken from pin VS as well as from pin FB (connected to

V

Chapter 7, Enable and Thermal Shutdown). Thus the power consumption from the supply voltage

V

minimized.

Figure 3

Block Diagram Buck Regulator

-

Driver

CS-gmI

EA-gmV

PWM

PFM

Logic

Clock

Manager

PWM Comp

SoftStart

GateD

VS

SWO

FB

FREQ

SYNC_IN

GND

PFM

Comparator

-

Slope

Comp.

VBG

CLK

CK_A