IOUT (A)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0

10

20

30

40

50

60

70

80

90

100

D018

3.3V

2.65V

1.8V

1.5V

1.2V

LP8728

FB_B1

SW_B1

VOUT1

FB_B2

SW_B2

VOUT2

FB_B3

SW_B3

VOUT3

FB_B4

SW_B4

VOUT4

1.5 µH

EN_B1

EN_B2

EN_B3

EN_B4

PG_B1

PG_B2

PG_B3

PG_B4

Micro

Controller

DEFSEL

AVDD

BYP

VIN

VIN

VIN_B1

VIN

VIN_B2

VIN

VIN

VIN_B3

VIN_B4

VDDIO

1 µF

1 µF

10 µF

1.5 µH

1.5 µH

1.5 µH

10 µF

10 µF

10 µF

10 µF

10 µF

10 µF

10 µF

Product

Folder

Sample &

Buy

Technical

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Community

LP8728B-Q1

SNVSA70 – FEBRUARY 2015

LP8728B-Q1 Quad-Output Step-Down DC-DC Converter

1 Features

3 Description

The

LP8728B-Q1

is

a

quad-output

Power

1

•

LP8728B-Q1 is an Automotive Grade Product that

Management Unit (PMU), optimized for low-power

is AECQ-100 Grade 1 Qualified

FPGAs, microprocessors, and DSPs for automotive

•

Four High Efficiency Step-Down DC-DC

applications.

This

device

integrates

four

highly

Converters:

efficient

step-down

DC-DC

converters

into

one

package. Each converter has high current capability

–

93% Peak Efficiency (VIN = 5 V, VOUT = 3.3 V)

and separate controls which allows flexibility to use

–

Max Output Current 1 A

the device in multiple applications. All the converters

–

Forced PWM Operation

operate above the AM band with a fixed 3.2-MHz

–

Soft-Start Control

switching frequency. The high-side switch turn-on

time of each converter is phase shifted to minimize

–

VOUT1 = 3.3 V

input current spikes.

–

VOUT2 = 1.2 V

Protection

features

include

output

short-circuit

–

VOUT3 = 1.8 V or 2.65 V (pin selectable)

protection, switch current limits, input overvoltage

–

VOUT4 = 1.5 V

protection, input undervoltage lockout, and thermal

•

Separate Enable Inputs for each Converter

shutdown functions. During start-up, the device

controls the output slew rate to minimize output

Control

voltage overshoot and the input inrush current.

•

Separate Power Good Outputs for each Converter

•

Output Overcurrent and Input Overvoltage

Device Information(1)

Protection

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Overtemperature Protection

LP8728B-Q1

WQFN (28)

5.00 mm x 5.00 mm

•

Undervoltage Lockout (UVLO)

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

2 Applications

space

•

FPGA, DSP Core Power

space

•

Processor Power for Mobile Devices

space

•

Peripheral I/O Power

space

•

Automotive Safety Cameras

•

Automotive Infotainment

space

space

Simplified Schematic

Efficiency

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.