MP2624GL datasheet(27/45 Pages) MPS

27 / 45 page

MP2624 – 4.5A SW CHARGER W/ I2C CONTROL, NVDC POWER PATH, USB OTG

MP2624 Rev.1.05

www.MonolithicPower.com

4/9/2018

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

Boost Start -Up

Power the PMID Pin to 5V

Regulate the current at IIN _LMT + 300mA

Start the 3ms and 30ms Timer

VBUS > 4.6V?

Turn on the block switch

Yes

3ms timer expires ?

30ms timer expires?

Yes

Latch Off the block switch

Yes

Turn off block switch

Start 5ms timer

5ms timer expires ?

Yes

Figure 14: OTG Boost Start-Up Flow

OTG Boost Function

The MP2624 is able to supply a regulated 5V

output at IN for powering the peripherals

compliant with the USB On-The-Go specification.

The MP2624 will not enter the OTG mode if the

battery is below the battery UVLO threshold to

ensure that the battery is not drained. In order to

enable the OTG mode, the input voltage at IN

must be below 1.0V.

Boost operation can be enabled when REG01 Bit

[5:4] = 10/11 and OTG is high. The OTG output

current can be selected as 500mA or 1.3A via I2C

(REG02 Bit [1:0]). During boost mode, the status

Boost operation is enabled only when the

following conditions are met:



VBATT > VBATT_UVLO (rising 2.7V)



OTG

high,

and

REG01

Bit [5:4] =10/11



After a 200ms delay, boost mode is

enabled



VIN < 1V

Once OTG is enabled, if the voltage at VIN does

not go above the USB UVLO (4.65V) level within

30ms, the OTG fault will be asserted, and OTG

will be disabled until the host command is

executed, or OTG is toggled. Also, the MP2624

provides output short-circuit protection and

output over-voltage protection. In OTG mode, if

VIN falls below USB UVLO for more than 30ms,

an OTG fault will be asserted, and OTG will be

disabled until the host command is executed, or

OTG is toggled. Any fault during boost operation

sets the fault register REG09 Bit [6] to 1.

When both charging and OTG are enabled, the

OTG operation takes priority.

Figure 14 shows the OTG boost start-up time

sequence. Once OTG is enabled, the MP2624

will boost the PMID to 5.0V first. Then the block

FET is regulated linearly with the current limit of

IOLIM + 300mA. When the VIN_OTG is charged

higher than 4.6V within 6ms, the block FET is

turned on fully. Otherwise, PMID tries to charge

IN again after a 8ms off period. When the total

time hits 56ms, the OTG is turned off and will not

start again until the OTG mode is reset. When

the OTG output is in an OCP condition or short

condition, the output works the same process.

MP2624GL Datasheet(PDF) 27 Page - Monolithic Power Systems

MP2624GL Datasheet(HTML) 27 Page - Monolithic Power Systems

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

Datasheet Download

Link URL