ACT5101 datasheet(24/59 Pages) QORVO

24 / 59 page

Data Sheet Rev. E, November 2019 | Subject to change without notice

24 of 59

www.qorvo.com

ACT510x

23V Buck-Boost Converter with Integrated MOSFETs

The current sense resistor and ILIM resistor set the IILIM

current.

"!"#

= 1000

'"!"# ∗ '()_"*

Where RILIM is the resistor from the ILIM pin to AGND

and RCS_IN is the current sense resistor value in ohms.

The term 1000V^2/A is a constant with the units

volts^2/Ampere.

The current sense resistor, RCS_IN, has the same

limitations as RCS_OUT. At lower maximum input currents,

additional RC compensation must be placed in parallel

with RILIM. Table 4 is also valid for the input current limit

circuitry.

The input current limit circuitry, RISRP = RISRN = 30.1ohm

and CISR also have the same input filter requirements as

the output current circuitry.

The actual input current can also be externally

measured with the ILIM pin. The ILIM voltage is directly

proportional to the input current. The following equation

calculates the actual input current.

= "!"# "!"#

Table 5: I2C Input Current Limit Setting

INPUT_ILIM[1:0]

Input Current Scaling

Factor

Disabled

150% of IILIM

200% of IILIM

150% of IILIM

VOUT Over-Voltage Protection

To detect a possible plug in of a higher voltage supply

on VOUT, the IC detects an overvoltage condition on

VOUT and immediately stops switching. The output

overvoltage threshold is

fixed at

108%

of the

programmed output voltage. If the OV condition lasts for

more than 100ms, the IC exits POWER ON Mode and

enters HIZ Mode.

Cord Compensation

ACT510x provides cord compensation at the output.

This feature compensates for system level voltage

drops due to PCB, connector, and wiring resistances.

These resistances reduce the output voltage at the load.

The ACT510x features Cord Compensation which

allows the user to compensate for these system level

resistances by increasing the voltage regulation set

point proportional to the output current. The output

voltage increases linearly with increasing load current.

The I2C CORD_COMP[1:0] bits in register 0x0F set the

Cord Comp value.

The Cord Compensation value is normalized to RCS_OUT

= 10mΩ and a 2.4A load current. It scales linearly with

changes in current sense resistance or load current.

(/01_(/23

= ( 45_( #6 ∗ 2.4&∗

'()_

0.01Ω

Where VCORD_COMP is the I2C Cord Compensation value

of 100mV, 200mV, or 300mV per Table 6, IOUT is the

actual output current in Amperes, and RCS_OUT is the

current sense value in Ohms.

Table 6: Cord Comp Setting

CORD_COMP[1:0]

Setting

Cord Comp

Value

Equivalent

System

Resistance

0 (Disabled)

0mΩ

100mV

41.7mΩ

200mV

83.3mΩ

300mV

125.0mΩ

Light Load Disable

The ACT510x includes a Light Load Disable function.

This function maximizes battery life when the IC is

powered from a battery. It turns off the output and puts

the IC into HIZ mode when the load drops very low. This

condition typically happens when the ACT510x output

supplies power to a charging portable device. When the

portable device is fully charged, the output current drops

to 0A. Light Load Disable minimizes battery current (the

input to the ACT510x) consumption and extends battery

life when the output is not needed.

Light Load Disable is available when the IC is operating

in buck mode, VIN is higher than VOUT by a minimum

of 0.5V, and the Output Voltage is less than 6V. Enable

Light Load Disable by setting I2C bit OFF_LOAD_EN in

feature. The minimum current is set to 5mA typical. The

current must be low for longer than the time set in I2C

bit OFF_DLY[1:0]. This time can programmed to 10s,

20s, or 30s.

Once the state machine has detected a light load con-

dition, it enters the LL_DIS state. The IC must exit

POWER ON mode and re-enter POWER ON mode to

restart the converter. This is typically accomplished by

toggling the EN pin, but can also be accomplished via

I2C.

ACT5101 Datasheet(PDF) 24 Page - Qorvo, Inc

ACT5101 Datasheet(HTML) 24 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

Datasheet Download

Link URL