SW

OUT

L

L

IT

VALLEY,LIM

PEAK,LIMIT

f

D)

(

L

V

I

I

I

I

-

´

=

+

=

1

Inductor

Current

t

Valley current limit

Maximum load current

Peak current limit

Secondary current limit

TLV62565, TLV62566

SLVSBC1C – OCTOBER 2013 – REVISED JULY 2015

www.ti.com

Feature Description (continued)

Figure 14. Switch Current Limit

where:

•

•

(1)

10.3.5 Power Good

The TLV62566 integrates a Power Good output going low when the output voltage is below its nominal value.

The Power Good output stays high impedance once the output is above 95% of the regulated voltage and is low

once the output voltage falls below typically 90% of the regulated voltage. The PG pin is an open drain output

and is specified to sink typically up to 0.5 mA. The Power Good output requires a pull-up resistor connected to

any voltage lower than 5.5 V. When the device is off due to UVLO or thermal shutdown, the PG pin is pulled to

logic low.

10.4 Device Functional Modes

10.4.1 Under Voltage Lockout

To avoid mis-operation of the device at low input voltages, under voltage lockout is implemented that shuts down

10.4.2 Thermal Shutdown

temperature falls below the threshold with hysteresis, the device returns to normal operation automatically.

Power Good is pulled low when thermal protection is triggered.

12

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