Datasheet

TPS61020, TPS61024, TPS61025

TPS61026, TPS61027, TPS61028

TPS61029

SLVS451F –SEPTEMBER 2003–REVISED APRIL 2012

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The battery voltage, at which the detection circuit switches, can be programmed with a resistive divider

connected to the LBI pin. The resistive divider scales down the battery voltage to a voltage level of 500 mV,

which is then compared to the LBI threshold voltage. The LBI pin has a built-in hysteresis of 10 mV. See the

application section for more details about the programming of the LBI threshold. If the low-battery detection

circuit is not used, the LBI pin should be connected to GND (or to VBAT) and the LBO pin can be left

unconnected. Do not let the LBI pin float.

Low-EMI Switch

The device integrates a circuit that removes the ringing that typically appears on the SW node when the

converter enters discontinuous current mode. In this case, the current through the inductor ramps to zero and the

rectifying PMOS switch is turned off to prevent a reverse current flowing from the output capacitors back to the

battery. Due to the remaining energy that is stored in parasitic components of the semiconductor and the

inductor, a ringing on the SW pin is induced. The integrated antiringing switch clamps this voltage to VBAT and

therefore dampens ringing.

Product Folder Link(s): TPS61020 TPS61024 TPS61025 TPS61026 TPS61027 TPS61028 TPS61029