33730 datasheet(20/27 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33730

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

Figure 7. Battery Voltage Ramp Down

OPERATIONAL MODES

The 33730 can operate in the two modes: Low quiescent

current Sleep mode and Normal mode of operation.

SLEEP MODE

The 33730 operates in the Sleep mode when both the

VIGN pin and the REGON pins are pulled low. Both of these

pins have internal pull-downs, which assures that the IC is in

this defined state when those pins are left open.

When the IC enters the Sleep mode, all major functions

are disabled except for the Standby regulators. The Keep-

Alive regulator VKAM stays always operational (see Table 6).

If this output stays unloaded, the IC in the Sleep mode

consumes very low quiescent current (IQ).

If the VDD3 output was programmed as a VDD3 Standby

regulator (see Table 6), it too stays operational during the

Sleep mode, as well as the VKAM regulator. In this case, the

IC consumes about 100

μA of additional quiescent current

(assuming both VKAM and VDD3 Standby outputs are

unloaded).

NOTE: In the Sleep mode, the RSTKAM and RST3 are not

active and their outputs (as well as the outputs of RSTL and

RSTH) are in the high-impedance state.

NORMAL MODE

The 33730 enters the Normal mode of operation when

either the VIGN pin or the REGON pin is pulled high. In this

case the IC is fully operational with all regulator outputs ready

to supply power and all control, monitoring and protection

features activated.

VKAM =1.0V

3.0V

Battery

Voltage

RSTKAM

RSTL, RST3

RSTH

VDDL =VDD3 =3.3V

VDDH =5.0 V

100us

VDD3,

VDDL

out of

regulation

VDDH

turned

off

VDD3, VDDL

actively

pulled low

VDDH

out of

regulation

4.5V

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