MPC18730EPR2 datasheet(14/35 Pages) FREESCALE

14 / 35 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

18730

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The 18730 power management integrated circuit provides

five independent output voltages for the micro controller from

either a single cell Li-Ion or from a single cell Ni-MH or dry

cell. The PMIC includes two DC to DC converters and three

low drop out linear regulators. The output voltage for each of

the five output voltages is set independently through a 3-wire

serial interface. The PMIC has multiple wakeup, sleep, and

reset modes to minimize power consumption for portable

equipment. In single cell Li-Ion applications two DC-DC

converters are configured as buck regulators. In single cell

Ni-MH or dry cell applications, one DC-DC converter is

configured as a boost regulator, and the other as buck-boost

regulator.

FUNCTIONAL PIN DESCRIPTION

CLEAR PIN (CLEAR)

This Clear input signal makes clear internal latches for

WAKE signal holding. The WAKE control circuit can not

receive another WAKE input until the latch is cleared by this

Clear input.

WAKE SIGNAL PINS (WAKE1B, WAKE2B,

WAKE3B, WAKE4B) ... ACTIVE LOW

Any one WAKE input signal of these four WAKE inputs

awakes this device from sleep mode. The WAKE signals can

be made with external low side mechanical switch and

resistance that is pulled up to VSTB rail.

LOW-SIDE SWITCH OUTPUT PIN (LSWO)

Low-Side switch output that is turned on with ‘CLEAR’

signal. It can be used for external key input latches clear.

LOW VOLTAGE BATTERY PIN (LVB)

This input pin is used for temporarily power supply while

wake up for 1cell Ni-MH battery or 1 cell dry cell battery (=

Low Voltage Battery) use. It has to be connected to VB rail.

When Li-Ion battery is used, the pin has to be open.

HIGH VOLTAGE BATTERY PIN (HVB)

This input pin is used for temporarily power supply while

wake up for Li-Ion battery (= High Voltage Battery) use. It has

to be connected to the VB rail. When a Ni-MH battery is used,

the pin has to be connected to ground level.

STANDBY VOLTAGE PIN (V_STDBY)

Standby Voltage is made from LVB or HVB that depends

on which battery is used. This voltage is used for internal

logic and analog circuit at standby (sleep) mode temporarily

before ‘VO1_SENSE’ voltage is established.

VOLTAGE INPUT PINS (VO1_SENSE, VO2_SENSE)

This power supply input pin named ‘VO1_SENS or

VO2_SENSE’ is for internal logic and analog circuits and for

input of ‘VOUT1’ output via power switch. Input for ‘VOUT2’

is ‘VO2_SENSE_IN’ pin. It is supplied from the output of

Channel-1 or Channel-2 DC/DC converter as

‘VO1_SENSEor VO2_SENSE.

VOLTAGE OUTPUT PINS (VOUT1, VOUT2)

Output ‘VO1_SENSE or ‘VO2_SENSE’ voltage controlled

internal power switch.

POWER INPUT PINS (VIN1, VIN2)

The power input pins (VIN1, VIN2) are drain pins on the

top side FET of the DC/DC converter switcher. They are the

power input for the buck converter and output for the boost

converter.

SWITCHING PINS (SW1, SW2)

Switching Pins (SW1, SW2) are the output of the half

bridge and connect to the external inductance.

POWER GROUND PINS (PGND1, PGND2,

GNDGATE)

Ground level node for DC/DC converter and Charge Pump

portion.

INVERTED RESET OUTPUT PINS (PGOOD1,

PGOOD2)

Reset signal output for external MPU or the something

controller. PGOOD1 keeps ‘Low’ level while the

VO1_SENSE voltage is less than internal reference voltage.

PGOOD2 follows to VO2_SENSE voltage.

RESET DELAY CAPACITOR PINS

(PGOOD1_DELAY, PGOOD2_DELAY)

The capacitor connected to this pin decides delay time to

negate the Reset signal from exceeding the reference

voltage level.

RESET 1 ADJUSTMENT PIN (RESET1_TH)

Used to adjust the reset level with external resistance

which is connected to VO1_SENSE for PGOOD1.

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