TPS62160-Q1

SLVSCK6 – DECEMBER 2014

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8.3 Feature Description

8.3.1 Enable / Shutdown (EN)

When Enable (EN) is set High, the device starts operation.

Shutdown is forced if EN is pulled Low with a shutdown current of typically 1.5 µA. During shutdown, the internal

power MOSFETs as well as the entire control circuitry are turned off. The internal resistive divider pulls down the

output voltage smoothly. If the EN pin is Low, an internal pull-down resistor of about 400 k

Ω is connected and

keeps it Low in case of floating pin.

Connecting the EN pin to an appropriate output signal of another power rail provides sequencing of multiple

power rails.

8.3.2 Softstart

The internal soft start circuitry 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 drops from high-

impedance power sources or batteries. When EN is set to start device operation, the device starts switching after

startup operation.

The TPS62160-Q1 can start into a pre-biased output. During monotonic pre-biased startup, the low-side

MOSFET is not allowed to turn on until the device's internal ramp sets an output voltage above the pre-bias

voltage.

8.3.3 Power Good (PG)

The TPS62160-Q1 has a built in power good (PG) function to indicate whether the output voltage has reached its

appropriate level or not. The PG signal can be used for startup sequencing of multiple rails. The PG pin is an

open-drain output that requires a pull-up resistor (to any voltage below 7 V). It can sink 2 mA of current and

maintain its specified logic low level. It is high impedance when the device is turned off due to EN, UVLO or

thermal shutdown.

8.3.4 Under Voltage Lockout (UVLO)

If the input voltage drops, the under voltage lockout prevents misoperation of the device by switching off both the

power FETs. The under voltage lockout threshold is set typically to 2.7 V. The device is fully operational for

voltages above the UVLO threshold and turns off if the input voltage trips the threshold. The converter starts

operation again once the input voltage exceeds the threshold by a hysteresis of typically 180 mV.

8.3.5 Thermal Shutdown

(typ), the device goes into thermal shut down. Both the high-side and low-side power FETs are turned off and PG

operation, beginning with Soft Start. To avoid unstable conditions, a hysteresis of typically 20°C is implemented

on the thermal shut down temperature.

8.4 Device Functional Modes

8.4.1 Pulse Width Modulation (PWM) Operation

The TPS62160-Q1 operates with pulse width modulation in continuous conduction mode (CCM) with a nominal

and the inductance. The device operates in PWM mode as long the output current is higher than half the

inductor's ripple current. To maintain high efficiency at light loads, the device enters Power Save Mode at the

boundary to discontinuous conduction mode (DCM). This happens if the output current becomes smaller than

half the inductor's ripple current.

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