MP2632B datasheet(33/43 Pages) MPS

33 / 43 page

MP2632B

– ALL-IN-ONE, 3A SW CHARGER, 3A BOOST

MP2632B Rev. 1.0

www.MonolithicPower.com

3/9/2018

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

Integrated Over-Current Protection (OCP)

and Over-Voltage Protection (OVP) for Pass-

Through Path

The MP2632B has an integrated VIN-to-SYS

pass-through path to allow for direct connection

of the input voltage to the system. Therefore,

The MP2632B monitors both the input current

and input voltage continuously. In the event of

an overload, the charge current is reduced to

ensure

priority

the

system

power

requirements.

Additionally, the MP2632B also features input

over-current protection (OCP) and over-voltage

protection (OVP) for the VIN-to-SYS pass-

through path.

Input Over-Current Protection (OCP)

If 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.

If the input current exceeds 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 MP2632B 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 MP2632B. At this

time, the VIN-to-SYS pass-through path is

disabled.

SYS

Charge

Pump

Figure 12: Integrated Pass-Through Path

Battery-Short Protection

In charge mode, the MP2632B has two current-

limit thresholds. 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 battery regulation voltage.

Thermal Foldback Function

The MP2632B implements thermal protection to

prevent thermal damage to the IC and the

surrounding components. An internal thermal

sense

and

feedback

loop

decrease

the

programmed charge current automatically when

the

die temperature reaches 120°C. This

function

called

charge-current

thermal

foldback. This function protects the device from

thermal damage and can also set the charge

current based on requirements rather than

worst-case

conditions

while

ensuring

safe

operation. Furthermore, the MP2632B includes

a thermal shutdown protection, where charging

stops if the junction temperature rises to 150°C.

Non-Sync Operation Mode

During charging mode, the MP2632B monitors

the total input current flowing from VIN 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 MP2632B has a built-in 600kHz frequency

oscillator for the switching frequency. Unlike a

fixed

frequency

traditional

peak-current

control, the MP2632B features a constant-off-

time control to support the constant-current

charge, even when the input voltage is very

close to the battery voltage. The MP2632B

compares the high-side MOSFET sense current

with 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 can be extended as long as possible.

Indication for Fault Flag in Charge Mode

The

MP2632B

designed

with

distinct

indication separating the charging fault from the

normal operation. The charging fault includes

INOVP, BOVP, and NTC fault, the four LED

pins blink with 1Hz of frequency simultaneously

(see Table 3).

MP2632B Datasheet(PDF) 33 Page - Monolithic Power Systems

MP2632B Datasheet(HTML) 33 Page - Monolithic Power Systems

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