TPS65471

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SLVSBE8 – JUNE 2012

USB Suspend Function

TPS65471 has USB suspend function. USB_SUSPEND = H sends TPS65471 into USB suspend mode. While in

USB suspend mode, current from the USB host to the VBUS pin is reduced under the USB suspended current.

USB suspend mode does not depend on Li-ion battery status. Even if the Li-ion battery on the VBAT pin is

removed or NG. VBUS, which is in USB suspend mode, does not provide electrical power for 3.2-V, 3-V and

4.25-V outputs and these outputs should be disabled.

Even in USB suspend mode, when VAC exists, source power is provided to the 3.2-V, 3-V and 4.25-V outputs

from VAC.

This function complies with Table 1.

Standby Function

TPS65471 enters standby mode when the power source Li-ion battery (states #05# and #06#) and both logic

inputs of EN_VLDO and EN_VLDO3 are at L level. While in standby mode, current from the Li-ion battery to the

between the PWR pin and VBAT pin in parallel. In order for the TPS65471 to decrease the power supply current,

the PMOS FET operates in standby mode. In standby mode, the PMOS FET turns on corresponding to the

output current of the VLDO1 voltage drop of PWR.

To recover from standby mode, the logic input of EN_VLDO or EN_VLDO3 is set to H level, then the low

resistance NMOS FET connected between PWR and VBAT turns on. The startup time of the LDOs controlled by

these logic input signals is approximately 1 ms.

Copyright © 2012, Texas Instruments Incorporated

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