34653 datasheet(13/24 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

34653

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

STATE MACHINE

Figure 13 is a representation of the 34653 behavior in

different modes of operation.

Figure 13. State Diagram

MOSFET

→ OFF

PG = 0

Undervoltage

MOSFET

→ OFF

PG = 0

Power Off

Temp < 135°C

Filter = 12

µs

VPWR < VUVLOF

Filter = 1.0 ms

A signal “set” is generated to check

resistors on UV, ILIM, ICHG, and

TIMER pins and 128

µs later

the OV pin

Retry Fault

STOP

Toggle DISABLE

or cycle Power Off

then On to clear fault

Power

Good Check

and VDS < 500 mV

for 20 ms

Charging Mode

≤ 10

Turn Off

MOSFET

→ OFF

PG = 0

PG = 1

N = 0

VPWR > VUVLOR

Filter = 1.0 ms

Filter = 3.0 ms

ILOAD > ILIM

ILOAD < ILIM - ILIMHY

Short Circuit

Detection

Fast Gate Discharge

< 10

µs

ILOAD > ISHORT

Overcurrent

for > 3.0 ms

Pass PG

Check

Fail PG

Check

> 10

for 100

µs

VPWR < VUV(OFF)

Filter = 1.0 ms

MOSFET

→ OFF

PG = 0

Overvoltage

VPWR < VOV(ON)

VPWR > VOV(OFF)

Filter = 1.0 ms

PG = 0

MOSFET

→ OFF

Temp > 160°C

Filter = 12

µs

Thermal

Shutdown

Ext. Resistor Check

POR is generated

N = 0

MOSFET

→ OFF

PG = 0

DISABLE

POR is generated

N = 0

DISABLE = 1

Filter = 1.0 ms

DISABLE = 0

Filter = 1.0 ms

VPWR > VUV(ON)

Filter = 1.0 ms

If ILOAD < ILIM

Overcurrent Mode

Normal Operation

VDS < 500 mV

Start-Up Conditions

• Thermal Shutdown < 160°C

Filter = tTIMER

• VPWR > VUV(OFF)

• VPWR < VOV(OFF)

N = N + 1

• DISABLE = 0

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