DA6021 datasheet(82/225 Pages) RENESAS

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DA6021

HIGHLY INTEGRATED POWER MANAGEMENT IC FOR

INTEL® ATOM™ Z3000 PROCESSOR

Company Confidential

Data Sheet

Version 3.A - Final

31-Jan-14

82 of 224

www.dialog-semiconductor.com

DC/DC Buck Regulator VNN

11.6.2

The BUCK_VNN converter is a high efficiency synchronous step down regulator operating at a high frequency

MHz) supplying a voltage (VNN) of 0.5 … 1.2V at maximum 8000mA. This buck regulator has the ability to

dynamically change its output

voltage setting to per SoC’s frequency-power requirements. The output voltage is

controlled using the SVID interface.

Figure 30: Buck VNN Block Diagram

11.6.2.1

VNN Current

The SoC has the ability to increase the core frequency during burst mode (achieving exceptional performance)

when the system environment is conducive. As long as the thermal and power budget allows, the current of the

VCC voltage rail can be more than twice the normal mode value.

IMAX = 8000mA

11.6.2.2

Power States

Active state:

DA6021 VNN voltage rail can handle up to 8A peak current for duration of several seconds until it would reach

the maximum operational temperature of DA6021. The regulator automatically switches between synchronous

PWM and asynchronous PFM mode depending on the load.

At usage workloads, VNN current is typically in the range of 50mA to 500mA

S0ix:

When The SoC enters the S0ix state, SLP_S0ix is held low. DA6021 turns the VNN buck regulator into low

power mode and disables all un-necessary blocks, reducing the power requirements. PMIC exits this power

saving mode within 5µs after SoC asserts the SLP_S0ix signal to high.

Typical current requirements for S0ix mode are 7mA .. 20mA. However this power saving mode supports up to

200mA maximum current without catastrophic failures.

11.6.2.3

Electrical Characteristics VNN

PARAMETER

TEST

CONDITIONS

MIN

TYP

MAX

UNIT

Val

VNN_IN

Input Voltage

2.7

4.5

Cin

at VNN_IN

4 x 4.7

µF

Cout

6 x 22

μF

ESR of output capacitor

6 @ 22µF

mΩ

ESL of output capacitor

1.6 @ 3MHz

L_BUCK

inductor value

-20%

4x0.47µ

+20%

μH

L_DCR

inductor DC resistance

mΩ

VNN

Output Voltage

IOUT= Imax

0.50

1.2

VNN

Output Accuracy

See chapter 0

F_BUCK

Frequency of operation

MHz

Transient load current profile

2900-5600mA

200

VNN_GND

BUCK_VNN

VNN_VIN

0.5V

–1.2V

8 A

VNN_SENSEP

LX1

0.47µH

LX2

LX3

LX4

VNN bus

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