MP2667GG datasheet(16/35 Pages) MPS

16 / 35 page

MP2667

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

MP2667 Rev. 1.0

www.MonolithicPower.com

5/8/2019

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

OPERATION

The MP2667 is an I2C-controlled, single-cell, Li-

ion or Li-polymer battery charger with complete

power path management. The full charge

function features fast charge (CC) and constant

voltage (CV) regulation, pre-charge (PRE.C),

charge termination, auto-recharge, and a built-

in timer. The power path function allows the

input source to power the system and charge

the battery simultaneously. If the power source

cannot supply enough current to the system

load and to charge the battery, then the charge

current will be reduced until it is necessary for

the battery to supplement system power.

The IC integrates a 300mΩ LDO FET between

IN and SYS,

and a 100mΩ battery FET

between SYS and BATT.

During charging mode, the on-

chip 100mΩ

battery FET works as a full-featured linear

charger with pre-charging, CC and CV charging,

charge

termination,

auto-recharging,

NTC

monitoring, built-in timer control, and thermal

protection.

The

charge

current

can

programmed via the I2C interface. The IC limits

the charge current when the die temperature

exceeds the programmable thermal regulation

threshold (120°C default).

When the input power is not sufficient for

powering the system load, the MP2667 enters

supplement mode by fully turning on the

100mΩ battery FET. When the input is removed,

the 100mΩ battery FET is also fully turned on,

allowing the battery to power up the system.

When

the

system

load

satisfied,

the

remaining current is used to charge the battery.

The IC reduces the charging current or uses

power from the battery to satisfy the system

load when its demand is over the input power

capacity, or if either the input current or voltage

loops are active.

Figure 3 shows the power path management

structure for the MP2667.

MP2667

LDO FET

Backlighting

LDO Rails

MCU

Battery

FET

Input

Battery

System

Figure 3: Power Path Management Structure

Power Supply

The internal bias circuit of the IC is powered

from the higher voltage of IN or BATT. When IN

or BATT rises above the respective under-

voltage lockout (UVLO) threshold, the sleep

comparator, battery depletion comparator, and

battery FET driver are active. The I2C interface

is ready for communication, and all registers

are reset to the default value. The host can

access all registers.

Input OVP and UVLO

The

MP2667

has

input

over-voltage

protection (OVP) threshold and an input UVLO

threshold. Once the input voltage transitions out

of the normal input voltage range, the Q1 FET

immediately turns off.

When the input voltage is identified as a good

source, a 200μs immunity timer is active. If the

input power is normal until

the 200μs timer

expires, the system starts up. Otherwise, Q1

remains off (see Figure 4).

VIN

VSYS

200

μs

200

μs

INOVP

Threshold

Figure 4: Input Power Detection Operation

MP2667GG Datasheet(PDF) 16 Page - Monolithic Power Systems

MP2667GG Datasheet(HTML) 16 Page - Monolithic Power Systems

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