MP2632 datasheet(28/37 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.

give priority to the system power and maintain

proper regulation of the input voltage.

Integrated

Over-Current

Protection

and Over-Voltage Protection for Pass-

Through Path

The IC has an integrated IN-to-SYS pass-through

path to allow direct connection of the input

voltage to the system. Therefore, the IC monitors

both the input current and voltage continuously.

In the event of an overload, the charge current is

reduced to ensure priority of the system power

requirements.

The IC also features input over-current and over-

voltage protection for the IN-to-SYS pass-through

path.

Input Over-Current Protection (OCP)

When the total input current exceeds 5A, Q2 is

controlled linearly to regulate the current (see

Figure 12). If the current continues to exceed 5A

after 200

μs of blanking time, Q2 is turned off. In

the event of the input current exceeding 7A, Q2

is turned off almost instantaneously and without

any blanking time. This is done to protect both

Q1 and Q2.

Input Over-Voltage Protection (OVP)

The IC has a built-in over-voltage threshold

(VIN_OVP). When the input voltage is higher than

VIN_OVP, an invalid input power source is detected

by the IC. At this time, the IN-to-SYS pass-

through path is turned off to prevent connecting

to the wrong adapter.

SYS

Charge

Pump

Figure 12: Integrated Pass-Through Path

Battery Short Protection

In charge mode, the MP2632 uses two inherent

current-limit thresholds due to a peak-current-

control strategy. CC and CV modes have a peak-

current-limit threshold of 7A, while TC mode has

a current-limit threshold of 4A. Therefore, the

current limit threshold decreases to 4A when the

battery voltage drops below the TC threshold.

The switching frequency also decreases when

the BATT voltage drops to 40% of the charge-full

voltage.

Thermal Foldback Function

The IC implements thermal protection to prevent

thermal damage to the IC and the surrounding

components. An internal thermal sense and

feedback

loop

decreases

the

programmed

charge

current

automatically

when

the

die

temperature reaches 120°C. This function is

called the charge-current-thermal foldback. This

function protects against thermal damage and

sets the charge current based on requirements,

rather than worst-case conditions while ensuring

safe operation. The part also includes thermal

shutdown protection, where the charging process

is stopped if the junction temperature rises to

150°C.

Non-Sync Operation Mode

During charging mode, the IC monitors the total

input current flowing from IN to SYS continuously.

When the input current is lower than 170mA, the

low-side switch operates as a non-synchronous

MOSFET.

Constant Off-Time Control for Large

Duty Charging Operation

The IC has a built-in 600kHz frequency oscillator

for the switching frequency. Unlike a traditional

fixed-frequency

peak-current

control,

the

features a constant-off time control to support a

constant current charge, even when the input

voltage is very close to the battery voltage. The

IC compares the high-side MOSFET sense

current with the comp level continuously (see

Figure 13). If the sense current does not reach

the comp level within the original switching period,

the next clock is delayed until the sense current

reaches the comp level. As a result, the duty

cycle is able to be extended as long as possible.

Indication for Fault Flag in Charge

Mode

The MP2632 is designed with distinct indication

separating the charging fault from the normal

operation. At the charging fault, including INOVP,

BOVP, and NTC fault, the four LED pins blink

with a 1Hz frequency simultaneously (see Table

3).

MP2632 Datasheet(PDF) 28 Page - Monolithic Power Systems

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