ACT88430 datasheet(38/74 Pages) QORVO

38 / 74 page

Data Sheet Rev. G, August 2021 | Subject to change without notice

38 of 74

www.qorvo.com

ACT88430

Advanced PMU for Microcontrollers and Solid State Drive Applications

LDO3

0x81h

RANGE_LDO3

Output-

Low

Output-

High

The programming range for Output-Low is 0.8V to

2.375V in 25mV steps.

VLDOx = 0.8V + LDOxVSET * 0.025V

Where LDOxVSET is the decimal equivalent of the

value in each regulator’s I2C LDOxVSET register. The

LDOxVSET registers contain an unsigned 6-bit binary

value. As an example, if LDO 1’s LDOxVSET register

contains 101000b (40 decimal), the output voltage is

1.8V.

The programming range for Output-High is 2.0V to

3.575V in 25mV steps.

VLDOx = 2.0V + LDOxVSET * 0.025V

Where LDOxVSET is the decimal equivalent of the

value in each regulator’s I2C LDOxVSET register. The

LDOxVSET registers contain an unsigned 6-bit binary

value. As an example, if LDO 1’s LDOxVSET register

contains 01010000b (52 decimal), the output voltage is

3.3V.

Qorvo recommends that an LDO’s output voltage be

kept within +/- 25% of the default output voltage to main-

tain accuracy. Voltage changes larger than +/- 25% may

require different factory trim settings (new CMI) to main-

tain accuracy.

Overcurrent and Short Circuit Protection

Each LDO provides overcurrent and short circuit

protection. The overcurrent threshold is set by the

LDOx_ILIM I2C bits. In both an overload and a short

circuit condition, the LDO limits the output current which

causes the output voltage to drop. This can result in an

undervoltage fault in addition to the current limit fault. If

an LDO reaches current limit protection, the status is

reported in the ILIM_REG[x] I2C registers. The contents

of these registers are latched until read via I2C. When

the current limiting results in a drop in output voltage

that triggers an undervoltage condition, the IC shuts

down all power supplies, asserts IRQ low, and enters

the UVLOFLT state. The IC restarts in 100ms and starts

up with default sequencing. Overcurrent and short

circuit conditions can be masked via the I2C bit

LDOx_ILIM_FLTMSK.

Input Capacitor Selection

Each LDO requires a high quality, low-ESR, ceramic

input capacitor. A 1uF is typically suitable, but this value

can be increased without limit. The input capacitor is

should be a X5R, X7R, or similar dielectric.

Output Capacitor Selection

Each LDO requires a high quality, low-ESR, ceramic

output capacitor. A 1uF is typically suitable, but this

value can be increased without limit. The input capacitor

is should be a X5R, X7R, or similar dielectric.

LDO1 Load Switch Mode

LDO1 has an option to be used as a load switch. This

option is only accessible via factory I2C bits and requires

a custom CMI. When in load switch mode, LDO1 still

retains

overcurrent

protection.

Overvoltage

and

undervoltage protection are disabled.

The load switch mode softstart times are the same as

the LDO mode times.

The following table shows the load switch Current

limit settings.

Table 8: Load Switch Current Limit Settings

ILIM_SET<1:0>

ILIM(mA)

1415

1503

1626

1904

Both Overvoltage and Undervoltage functionality are

disabled.

The LDO1 POK is functional in Load Switch mode. The

POK signal is asserted when the switch is enabled and

is not in current limit.

ACT88430 датащи(PDF) 38 Page - Qorvo, Inc

ACT88430 датащи(HTML) 38 Page - Qorvo, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74

датащи скачать

ссылки URL