13892 datasheet(69/161 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

13892

FUNCTIONAL DEVICE OPERATION

OPERATING MODES

Figure 14. Memory Hold Circuit

EXITING FROM LOW POWER OFF MODES

When a Turn On event occurs, any switchers that are active through Low Power Off modes will stay in PFM mode at their

Standby voltage set points until the applicable time slot of the startup sequencer. At that point, the respective switcher is updated

for the PUMSx defined default state for mode and voltage. Subsequent closing of the power gate switches will be coordinated

by software to complete restoration of the full system power tree.

POWER GATING SPECIFICATIONS AND CONTROL

A power gate driver pulled low may be thought of as power gating being active since this is the condition where a power source

is isolated (or power gated) from its loading on the other side of the switch. The power gate drive outputs are SPI controlled in

the active modes as shown in Table 38.

Table 37. Power Gating Characteristics

Parameter

Condition

Min

Typ

Max

Units

Output Voltage VOUT

Output High

5.0

5.40

5.70

Output Low

100

Turn-on Time (54), (55)

Enable to VOUT = VOUTMIN -250 mV

100

μs

Turn Off Time

Disable to VOUT < 1.0 V

μs

Average Bias Current

t > 500

μs after Enable

1.0

μA

PWGTx Input Voltage

NMOS drain voltage

0.6

2.0

DC Load Current

At PWGTDRVx output

100

Load Capacitance (54)

Used as a condition for the other parameters

0.5

1.0

Notes

54.

Larger capacitive loading values will lead to longer turn on times exceeding the given limits; smaller values will lead to larger ripple at

the output.

55.

Input supply is assumed in the range of 3.0 < BP < 4.65 V; lower BP values may extend turn on time, and functionality not supported

for BP less than ~2.7 V.

Table 38. Power Gate Drive State Control

Mode

PWGTDRV1

PWGTDRV2

Off

Low

Cold Start

Low

Warm Start

Low

Watchdog, On, User Off Wait

SPI Controlled

User Off, Memory Hold, Internal Memory Hold Power Cut

Low

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