1

1

3

1

3

3

1

7

SW1

SW2

FB*

VIN2

1

EN*

SS/TR

PG

HS1

HS2

phase shift

HS2

power

control

Power Save

Mode

HS1

gm

master

follower

PG control

Thermal

Shutdown

UVLO

control logic

delay

off-timer

VIN

VO

VIN

3

VIN1

VIN1

VIN2

VO

GND

*Pin is connected to a pull down resistor internally

(see Feature Description section)

AEE

TM

HICCUP

VIN

60

EN

gate

drive

TPS62180, TPS62182

SLVSBB8A – AUGUST 2014 – REVISED AUGUST 2014

www.ti.com

Functional Block Diagram (continued)

Figure 7. TPS62182 (Fixed output voltage)

9.3 Feature Description

9.3.1 Enable / Shutdown (EN)

and 0.9 V for falling voltages, providing a threshold accuracy of ±3%. That makes it suitable for precise switching

on and off in accurate power sequencing arrangements as well as for slowly rising EN control voltage signals

(see Using the Accurate EN Threshold for more details).

The device is disabled by pulling EN Low. A discharge resistor of about 60

Ω is then connected to the output. At

the EN pin, an internal pull down resistor of about 350 k

Ω keeps the Low state, if EN gets high impedance or

floating afterwards.

sequence is initiated about 100 µs after EN is pulled High.

9.3.2 Soft Start / Tracking (SS/TR)

The soft start circuit controls the output voltage slope during startup. This avoids excessive inrush current and

ensures a controlled output voltage rise time. It also prevents unwanted voltage drop from high impedance power

slope, controlled by the external capacitor connected to the SS/TR pin. It is not recommended to leave the

Curves.

8

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