MPC18730EPR2 datasheet(20/35 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

18730

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

POWER SUPPLY VO1_SENSE, VO2_SENSE:

LI-ION

The VBATT voltage falls and is output to VO1_SENSE.

When using Li_ion, duty limit due to DMAX1 is not applied to

the switch. When PGOOD2(int) is High, the power switch

turns ON to output the VO1_SENSE voltage to VOUT1.

Capacitance value which is connected to VO1_SENSE

should be higher than the capacitor connected to VOUT1.

The VBATT voltage falls using only the internal transistor

and is output to VO2_SENSE. When using Li_ion, duty limit

due to DMAX2 is not applied to the switch, and HG and LG

are Low. When PGOOD2(int) is High, the power switch turns

ON to output the VO2_SENSE_IN voltage to VOUT2. If you

turn DDC2 OFF using the register, the power switch 2 also

turns OFF. Capacitance value which is connected to

VO2_SENSE_IN should be higher than the capacitor

connected to VOUT2.

SERIES PASS POWER SUPPLY

The series pass outputs the SREGI1 voltage to SREGO1,

the SREGI2 voltage to SREGO2, and the SREGI3 voltage to

SREGO3. If you use MOSFET as the external component in

this case, connect the gate to SREG2G.

Table 11. Output Voltage of VO2_SENSE

Address: 0100(33)

S_Off_VO2_SENSE

VO2_SENSE [V]

0.805

0.811

0.816

0.827

0.849

0.893

0.980

1.155

1.161

1.166

1.177

1.199

1.243

1.330

1.500

Notes

30.

All combinations of input are not included

Table 12. Output Voltage of SREG1

Address: 0101(31)

Reserved

SREG1 [V](33)

0.865

0.880

0.895

0.926

0.986

1.107

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