MP2632 datasheet(25/37 Pages) MPS

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MP2632

– ALL-IN-ONE, 3A SW CHARGER, 3A BOOST

MP2632 Rev.1.0

www.MonolithicPower.com

6/24/2016

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

OPERATION

The MP2632 is a highly integrated, flexible,

switch-mode battery charger with system power-

path management designed for single-cell Li-ion

or Li-polymer battery use in a wide range of

applications. Depending on the status of the

input, the IC can operate in three different

modes: charge mode, boost mode, and sleep

mode.

In charge mode, the IC can work with a single-cell Li-

ion or Li-polymer battery. In boost mode, the IC boosts

the battery voltage to VSYS to power higher voltage

system rails. In sleep mode, both charging and boost

operations are disabled, and the device enters a

power saving mode to help reduce overall power

consumption. The IC monitors VIN to allow smooth

transitions between different modes of operation.

VCC Power Supply

The MP2632 has an external VCC power supply. VCC

is powered by the highest voltage level out of VSYS,

VBATT, and VIN - 0.7V. An external capacitor is required

to bypass VCC to GND. When VCC is higher than

2.2V, the internal control circuit is activated.

Charge Mode Operation

Charge Cycle

(Trickle Charge  CC Charge  CV

Charge)

In charge mode, the IC uses five control loops to

regulate the input current, input voltage, charge

current, charge voltage, and device junction

temperature. The IC charges the battery in three

phases: trickle current (TC), constant current

(CC), and constant voltage (CV).

When charge operation is enabled, all five loops

are active, but only one dictates the IC behavior.

A typical battery charge profile is shown in Figure

9a. The charger stays in TC charge mode until

the battery voltage reaches a TC-to-CC threshold.

Otherwise, the charger enters CC charge mode.

When the battery voltage rises to the CV mode

threshold, the charger operates in constant

voltage mode. Figure 9b shows a typical charge

profile

when

the

input

current

limit

loop

dominates during the CC charge mode. In this

case, the charger maximizes the charging current

due to the switching-mode charging solution,

resulting in charging that is faster than a

traditional linear charging solution.

Figure 9: Typical Battery Charge Profile

Auto-Recharge

Once the battery charge cycle is completed, the

charger remains off. During this time, the system

load may consume battery power, or the battery

may self-discharge. To ensure that the battery

does not go into depletion, a new charge cycle

begins automatically when the battery voltage

falls below the auto-recharge threshold and the

input power is present. The timer resets when the

auto-recharge cycle begins.

If the input power restarts during the off-state

after the battery is fully charged, the charge cycle

starts and the timer resets regardless of what the

battery voltage is.

Charge Current Setting

The external sense resistors (RS1 and RISET)

program the battery charge current (ICHG). Select

RISET based on RS1.

To optimize the transfer efficiency, RS1 is

recommended to be 10m

Ω. The relationship

between the RISET and ICHG is shown in Equation

(1):

CHG

ISET

1500

(A)

(k ) RS1(m )



 



(1)

MP2632 Datasheet(PDF) 25 Page - Monolithic Power Systems

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