18730 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

18730

Power Management IC with Five Regulated Outputs Programmed Through 3-Wire Serial Interface

Freescale Semiconductor 

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

capacitor which is connected to V_STDBY. When using

Ni_mh, short-circuit VBATT and LVB to external components

and HVB to GND. When using Li_ion, short-circuit HVB to

VBATT, and leave LVB open. When using Ni_MH, the VB

voltage is output from V_STDBY in Standby mode. When

using Li-Ion, 50% of the VBATT voltage is output to

V_STDBY pin in Standby Mode.

Table 8. HVB and LVB Connection

MODE

HVB

LVB

Li_ion

Ni_mh

VBATT(27)

GND

open

VBATT(27)

Notes

27. Externally connect to VBATT.

Table 9. V_STDBY and LSWO Operation

INPUT

OUTPUT

WAKE(Int) PGOOD2(Int)

CLEAR

V_STDBY

LSWO

L

X

X

VBATT

Z

H

L

X

VBATT

Z

H

H

L

VO1_SENSE

Z

H

H

H

VO1_SENSE

L

Z : High Impedance, X : Don’t care

RESET CIRCUIT

PGOOD1_DELAY,

PGOOD2_DELAY

VO1_SENSE,

VO2_SENSE VGATE

VO1_SENSE

PGOOD1, 2

RESET1_TH

(PGOOD1 side only)

VO1_SENSE

BANDGAP

REFERENCE

Reset

Control

PGOOD1, 2B(Int)

PGOOD1_DELAY,

PGOOD2_DELAY

Figure 8. Reset Circuit Block Diagram

When the VO1_SENSE or VO2_SENSE voltage is higher

than the reference value, PGOOD1 or 2B goes High. When

PGOOD1(int) is Low and PGOOD1 is High, SLEEP(int) is

forced to place the chip into the standby mode.

Connect a capacitor between RESET1_TH and

PGOOD_DELAY. The capacitor is not necessary if a resistor

of 330KΩ or less is inserted between RESET1_TH and

VO1_SENSE for reset adjustment

Connect the capacitor between RESET1_TH and PGOOD

as directed below.

When SEQ_SELECT is Low:Between RESET1_TH and

PGOOD1_DELAY

When SEQ_SELECT is High:Between RESET1_TH and

PGOOD2_DELAY

Use a capacitor with approximately half of the capacitance

between PGOOD_DELAY and GND

18730

18

Analog Integrated Circuit Device Data

Freescale Semiconductor

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