MP2637 datasheet(28/36 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.

voltage event happening at SYS side when

plugging in a wrong adapter.

SYS

Charge

Pump

Figure12: Integrated Pass-through Path

Charge Current Setting

The external sense resistors, RS1 and RISET,

program the battery charge current, ICHG. Select

RISET based on RS1:

CHG

ISET

2400

(A)

(k ) RS1(m )



 



(5)

Battery Short Protection

The MP2637 has two current limit thresholds. CC

and CV modes have a peak current limit

threshold of 6.5A, while TC mode has a current

limit threshold of 3.2A. Therefore, the current limit

threshold decreases to 3.2A when the battery

voltage drops below the TC threshold. Moreover,

the switching frequency also decreases when the

BATT voltage drops to 40% of the charge-full

voltage.

Thermal Foldback Function

The MP2637 implements thermal protection to

prevent thermal damage to the IC and the

surrounding components. An internal thermal

sense

and

feedback

loop

automatically

decreases the programmed charge current when

the die temperature reaches 120°C. This function

is called the charge-current-thermal foldback. Not

only

this

function

protects

against

thermal

damage, it can also set the charge current based

requirements

rather

than

worst-case

conditions

while

ensuring

safe

operation.

Furthermore, the part includes thermal shutdown

protection where the ceases charging if the

junction temperature rises to 150°C.

Non-sync Operation Mode

During charging mode, the MP2637 continuously

monitors the total input current flowing from IN

pin to SYS pin. 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 MP2637 has a built-in 600kHz frequency

oscillator for the switching frequency. Unlike a

traditional fixed frequency, the MP2637 features

a constant off time control to support constant-

current charge even when the input voltage is

very close to battery voltage. As shown in the

Figure 13, the MP2637 continuously compares

the high-side FET sense current with comp level,

if the sense current doesn

’t reach the comp level

within the original switching period, the next clock

will be delayed until the sense current reaches

the comp level. As a result the duty cycle is able

to be extended as large as possible.

Full Operation Indication

The

MP2637

integrates

indicators

for

the

following conditions as shown in Table2.

The blinking frequency is:

Blinking

TMR

1( A)

0.8 C

( F)







(6)

Table 2: Indicator for Each Operation Mode

Operation

ACOK

----------------

CHG

------------

BOOST

-------------------

Charge

Mode

In Charging

Low

High

End of Charge,

Charging

disabled,

Battery OVP

High

NTC Fault,

Timer Out

Blinking

Boost Mode

High

Low

Sleep Mode

High

MP2637 Datasheet(PDF) 28 Page - Monolithic Power Systems

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