MP2632GR datasheet(26/37 Pages) MPS

26 / 37 page

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.

Battery Over-Voltage Protection (OVP)

The IC

has battery over-voltage

protection

(OVP). If the battery voltage exceeds the battery

over-voltage threshold (103.5% of the battery

’s

full voltage), charging is disabled. Under this

condition, an internal 5kΩ dummy load draws a

small current from BATT to reduce the battery

voltage and protect the battery.

Timer Operation in Charge Mode

The IC uses an internal timer to terminate the

charging. The timer remains active during the

charging process. An external capacitor between

TMR and GND programs the charge cycle

duration.

If charging remains in TC mode beyond the

trickle-charge

time

(

TRICKLE_TMR),

charging

terminated. For the MP2632, the charge current

in TC mode is fixed at 265mA, and the sense

resistor (RS1)

is set to 10mΩ. The length of the

trickle-charge period can be determined with

Equation (2):

TMR

TRICKLE _ TMR

( F)

17mins

0.1 F











(2)

The

maximum

total

charge

time

can

calculated with Equation (3):

TMR

TOTAL _ TMR

CHG

( F)

7.55Hours

0.1 F

(A) 0.1











(3)

Negative Temperature Coefficient

(NTC) Input for Battery Temperature

Monitoring

The IC has a built-in NTC resistance window

comparator, which allows the IC to monitor the

battery temperature via the battery-integrated

thermistor during both charge and boost modes.

Connect an appropriate resistor from VNTC to

NTC and connect the thermistor from NTC to

GND. The resistor divider determines the NTC

voltage depending on the battery temperature. If

the NTC voltage falls outside of the NTC window,

the IC stops charging. The operation then

restarts if the temperature goes back into the

NTC

window

range.

Please

refer

the

Application Information section on page 33 for

the appropriate resistor selection.

VNTC Power Supply

The MP2632 has NTC protection in both boost

mode and charge mode. To allow NTC protection

in both boost mode and charge mode and to

minimize the battery leakage current in sleep

mode, the MP2632 uses a dedicated power

supply pin for the pull-up voltage for the NTC

protection function block. In boost mode and

charge mode, VNTC is connected to VCC

internally by a switch. In sleep mode, VNTC is

disconnected from VCC to minimize the battery

leakage current (see Figure 10).

NTC

VNTC

VCC

Charge

Control

Sleep mode

Figure 10: NTC Protection Block

Input DP1/DM1 USB Detection and Input

Current Limit

Power devices (PDs) are able to draw current

from the USB ports in personal computers to

charge their batteries. If the portable device is

attached to a USB host of the hub, then the USB

specification requires the portable device to draw

a limited current (usually 500mA). When the

device is attached to a charging port, it is allowed

to draw more than 1.5A.

The IC features input

source detection to

determine the input current limit according to the

input source (USB or adapter) (see Figure 11).

MP2632GR Datasheet(PDF) 26 Page - Monolithic Power Systems

MP2632GR Datasheet(HTML) 26 Page - Monolithic Power Systems

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