MP2637GR datasheet(26/36 Pages) MPS

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MP2637 –2.5A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 2.4A BOOST

MP2637 Rev. 1.04

www.MonolithicPower.com

8/3/2017

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

OPERATION

INTRODUCTION

The MP2637 is a highly-integrated, flexible,

switch-mode battery charger with system power

path management, designed for single-cell Li-ion

or Li-Polymer batteries used in a wide range of

applications. Depending on the status of the

Input, the MP2637 can operate in three different

modes: Charge Mode; Boost Mode; Sleep Mode.

In charge mode the MP2637 can work with a

single cell Li-ion or Li-polymer battery. In boost

mode the MP2637 boosts the battery voltage to

VSYS_SET 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 the overall power

consumption. The MP2637 monitors VIN to allow

smooth transition between different modes of

operation.

CHARGE MODE OPERATION

Charge

Cycle

(Trickle

ChargeCC

ChargeCV Charge)

In charge mode, the MP2637 has five control

loops to regulate the input current, input voltage,

charge current, charge voltage, and device

junction temperature. The MP2637 charges the

battery in three phases: trickle current (TC),

constant current (CC), and constant voltage (CV).

While charge operation is enabled, all five loops

are active but only one determines the IC

behavior. A typical battery charge profile is

depicted in Figure11 (a). 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 (b) shows a typical charge profile when

the input-current-limit loop dominates during the

CC charge mode, and in this case the charger

maximizes the charging current due to the

switching-mode charging solution, resulting in

faster charging than a traditional linear solution.

Figure 11: 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 the battery will not

into

depletion,

new

charge

cycle

automatically begins when the battery voltage

falls below the auto-recharge threshold and the

input power is present. The timer is reset when

the auto-recharge cycle begins.

During the off state after the battery is fully

charged, if the input power re-starts or the EN

signal refreshes, the charge cycle will start and

the timer will reset no matter what the battery

voltage is.

Battery Over-Voltage Protection

The MP2637 has battery over-voltage protection.

If the battery voltage exceeds the battery over-

voltage threshold, (103.3% of the battery-full

voltage),

charging

disabled.

Under

this

condition, an internal

5kΩ dummy load draws a

MP2637GR Datasheet(PDF) 26 Page - Monolithic Power Systems

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