MP2660 datasheet(17/34 Pages) MPS

17 / 34 page

MP2660

– 0.5A, 1-CELL CHARGER W/ I2C CONTROL, POWER PATH

MP2660 Rev. 1.01

www.MonolithicPower.com

1/2/2018

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

Once the charge current reaches the EOC

current threshold (IBF) and the CV loop is still

dominated, the IC has three possible actions

after a 500µs delay depending on the settings

of EN_BF (reg05 bit[6]) and TERM_TMR (reg05

bit[0]):

1. EN_BF = 1, TERM_TMR = 0, (default spec):

The IC terminates the charge and changes

the charge status to

“charge done.”

2. EN_BF = 1, TERM_TMR = 1: The IC

changes the charge status to

“charge done,”

but the charge current continues tapering off

until it reaches 0.

3. EN_BF = 0, TERM_TMR = x: The charge

status stays at

“charge,” but the charge

current

continues

tapering

off

until

reaches 0.

During the charging process, the actual charge

current may be less than the register setting

due to other loop regulations, such as dynamic

power

management

(DPM)

regulation

thermal regulation. Refer to the Input Current-

and Input Voltage-Based Power Management

section for details.

If IBF is not reached before the safety charge

timer expires (see Safety Timer section), the

charge cycle is ceased and corresponding

timeout fault signal is asserted.

The following conditions can start a new charge

cycle:



The input power is recycled



Battery charging is enabled by the I



Auto-recharge kicks in

However, these conditions can stop a charge

cycle:



No thermistor fault at NTC



No safety timer fault



No battery over voltage



BATFET is not forced to turn off

Automatic Recharge

When the battery is fully charged and charging

is terminated, the battery may be discharged

due to the system consumption or a self-

discharge.

When

the

battery

voltage

discharged below the recharge threshold, and

VIN is still in the operating range, the IC begins

another

new

charging

cycle

automatically

without the requirement of restarting a charging

cycle manually. The auto-recharge function is

valid only when EN_BF = 1 and TERM_TMR =

Battery Over-Voltage Protection (OVP)

The IC is designed with a built-in battery over-

voltage limit about 120mV higher than VBATT_REG.

When the battery over-voltage event occurs,

the IC suspends the charging immediately and

asserts a fault.

Input Current-

and Input

Voltage-Based

Power Management

To meet the input source (usually USB)

maximum current limit specification, the IC uses

an input current-based power management by

monitoring the input current continuously. The

total input current limit can be programmable

via the I

2C to prevent the input source from

overloading.

If the pre-set input current limit is higher than

the rating of the input source, back-up input

voltage-based power management also works

prevent

the

input

source

from

being

overloaded. If either the input current limit or the

input voltage regulation is reached, the Q1

MOSFET between IN and SYS is regulated so

that the total input power is limited. As a result,

the system voltage drops. Once the system

declines to the minimum value of 4.8V or

VSYS_REG - 200mV, the charge current is

reduced to prevent the system voltage from

dropping further.

The

voltage-based

dynamic

power

management (DPM) regulates the input voltage

to VIN_REG when the load is over the input power

capacity. VIN_REG set via the I

2C should be at

least 500mV higher than VBATT_REG to ensure the

stable operation of the regulator.

Battery Supplement Mode

The charge current is reduced to keep the input

current or input voltage in regulation when DPM

occurs. If the charge current is at zero and the

input source is still overloaded due to a heavy

system load, the system voltage starts to fall off.

Once the system voltage falls below the battery

voltage, the IC enters battery supplement mode.

When the system voltage is 30mV below the

battery voltage, the ideal diode mode is enabled.

The battery MOSFET is regulated to maintain

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