MC34712 datasheet(11/24 Pages) FREESCALE

Teilenummer	MC34712

Bauteilbeschribung	3.0 A 1.0 MHz Fully Integrated DDR Switch-Mode Power Supply

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Hersteller	FREESCALE [Freescale Semiconductor, Inc]

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Analog Integrated Circuit Device Data

Freescale Semiconductor

11

34712

FUNCTIONAL DESCRIPTION

FUNCTIONAL PIN DESCRIPTION

INTERNAL SUPPLY VOLTAGE OUTPUT (VDDI)

This is the output of the internal bias voltage regulator.

Connect a 1.0 µF, 6.0 V low ESR ceramic filter capacitor

between this pin and the GND pin. Filtering any spikes on this

output is essential to the internal circuitry stable operation.

OUTPUT VOLTAGE DISCHARGE PATH (VOUT)

Output voltage of the Buck Converter is connected to this

pin. it only serves as the output discharge path once the SD

signal is asserted.

ERROR AMPLIFIER INVERTING INPUT (INV)

Buck converter error amplifier inverting input. Connect the

VTT voltage directly to this pin.

COMPENSATION INPUT (COMP)

Buck converter external compensation network connects

to this pin. Use a type III compensation network.

INPUT SUPPLY VOLTAGE (VIN)

IC power supply input voltage. Input filtering is required for

the device to operate properly.

POWER GROUND (PGND)

Buck converter and discharge MOSFETs power ground. It

is the source of the buck converter low side power MOSFET.

SWITCHING NODE (SW)

Buck converter switching node. This pin is connected to

the output inductor.

POWER INPUT VOLTAGE (PVIN)

Buck converter power input voltage. This is the drain of the

buck converter high side power MOSFET.

BOOTSTRAP INPUT (BOOT)

Bootstrap capacitor input pin. Connect a capacitor (as

discussed on page 19) between this pin and the SW pin to

enhance the gate of the high side Power MOSFET during

switching.

SHUTDOWN INPUT (SD)

If this pin is tied to the GND pin, the device will be in

Shutdown mode. If left unconnected or tied to the VIN pin, the

device will be in Normal mode. The pin has an internal pull-

up of 1.5 M

Ω. This input accepts the S5 (Suspend-To-Disk)

control signal.

STANDBY INPUT (STBY)

If this pin is tied to the GND pin, the device will be in

Standby mode. If left unconnected or tied to the VIN pin, the

device will be in Normal mode. The pin has an internal pull-

up of 1.5 M

Ω. This input accepts the S3 (Suspend-To-RAM)

control signal.

POWER GOOD OUTPUT SIGNAL (PG)

This is an active low open drain output that is used to

report the status of the device to a host. This output activates

after a successful power up sequence and stays active as

long as the device is in normal operation and is not

experiencing any faults. This output activates after a 10 ms

delay and must be pulled up by an external resistor to a

supply voltage (e.g.,VIN.).

Ähnliche Beschreibung - MC34712

Hersteller	Teilenummer	Datenblatt	Bauteilbeschribung
Freescale Semiconductor...	MC34164-3	477Kb / 23P	3.0 A 1.0 MHz Fully Integrated DDR Switch-Mode Power Supply
NXP Semiconductors	KT34712UG	2Mb / 16P	Using the 3.0 A 1.0 MHz Fully Integrated DDR Switch-Mode Power Supply Rev. 4.0, 1/2009
Freescale Semiconductor...	MC34717	778Kb / 28P	5.0 A 1.0 MHz Fully Integrated Dual Switch-Mode Power Supply
	MC34713	587Kb / 23P	5.0 A 1.0 MHz Fully Integrated Single Switch-Mode Power Supply
	34717	651Kb / 25P	5.0 A 1.0 MHz Fully Integrated Dual Switch-Mode Dual Switch-Mode Power Supply
NXP Semiconductors	KT34717UG	1Mb / 20P	Using the 5.0 A 1.0 MHz Fully Integrated Dual Switch-Mode Power Supply Rev. 3.0, 1/2009
Freescale Semiconductor...	MC34716	772Kb / 27P	1.0 MHz Dual Switch-Mode DDR Power Supply
	34716	664Kb / 25P	1.0 MHz Dual Switch-Mode DDR Power Supply
	34712	477Kb / 23P	3.0A 1.0MHz Fully Integrated DDR Switch-Mode Power Supply
NXP Semiconductors	KT34716UG	1,005Kb / 17P	Using the 1.0 MHz Dual Switch-Mode DDR Power Supply Rev. 3.0, 1/2009

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