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TPS62081: Exceeding 2mA in snooze mode

Eddie Koh
Genius 10615 points
Part Number: TPS62081

In normal usage, we do not exceed 2mA in snooze mode, as recommended in datasheet's Recommended Operating conditions.

However, in production stage, before MCU firmware programming stage, we will exceed this condition for close a minute or so.

Under this scenario, while in snooze mode and load current exceeds 2mA:

1. What is the maximum rating without damaging TPS62081?

2. What is the efficiency above 2mA? (Figure 4 of datasheet stops at 2mA). We don't need characterized data, but just indicative data.

2. What is the quiescent current when load exceeds 2mA? (Just need indicative. Safe to say <30uA?)

  • 0
    TI__Expert 3645 points

    Hello,

    The device doesn't switch automatically from normal operation to snooze mode. For current higher than 2mA you have to disable the snooze mode.

    1) which maximum value do you mean?

    2) the efficiency above 2mA follows the efficiency in normal operation

    3) the quiescent current in the two modes are reported in section 7.5 on page 6. I attach these values that are only typical, so I can't say that the Iq will be below the typical value.

  • 0 in reply to Alfonso Furio
    TI__Genius 10615 points
    Hi Alfonso,

    1. Understand that TPS62081 does not automatically switch. In this use case, the MCU is supposed to switch TPS62081 in normal usage. However, during MCU programming phase, the MCU is unable to control/switch TPS62081. As such, it temporarily violate the 2mA spec.

    2. So, while TPS62081 is stuck in snooze mode, but MCU tries to draw up to 10mA from it, what will happen?
    - Will TPS62081 supply the 10mA? Or fixed supply at 2mA and voltage drops?
    - If TPS62081 supplies the 10mA, the efficiency follows the normal operation curve? (Not likely, I think)
  • 0 in reply to Eddie Koh
    TI__Expert 3645 points
    Hello,
    the device will supply 10 mA in the scenario you describe, but the datasheet in section 8.4.3 (page 11) recommend to disable the snooze mode when the load current exceeds 2mA to obtain an improvement in terms of dynamic load regulation. For load current above 2mA, the efficiency follows the normal operation curves.