MP2733 datasheet(20/51 Pages) MPSIND

20 / 51 page

MP2733

– 4.5A SW CHARGER WITH I2C CONTROL, NVDC POWER PATH, USB OTG

MP2733 Rev. 1.1

www.MonolithicPower.com

5/18/2023

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

Figure 5 shows the charging voltage regulation.

VTRACK

VSYS_REG_MIN

VBATT

vSYS

a) Charging Enabled

VSYS_MIN

b) Charging Disabled

VTRACK

VSYS_REG_MIN

VBATT

VSYS

VSYS_MIN

VBATT_GD

Figure 5: VSYS Variation with VBATT

Dynamic Power Management (DPM)

To meet the maximum current limit in USB

specifications and avoid overloading the adapter,

the

MP2733

features

dynamic

power

management (DPM), and continuously monitors

the input current (IIN) and input voltage (VIN). The

total input current limit is configurable to prevent

the input source from being overloaded. If the

input current increases and reaches the input

current limit (IIN_LIM), the charge current is

reduced to prioritize the system power.

If the preset IIN_LIM exceeds the adapter’s rating,

the additional minimum input voltage regulation

loop activates to prevent the input power source

from being overloaded. When VIN falls below the

input voltage regulation threshold due to a heavy

load, the charge current is reduced to prevent VIN

from dropping further.

Power path management can operate in two

ways:

1. If VBATT < VSYS_MIN + VBATT_GD, the system

voltage is regulated at VSYS_REG_MIN. If the

input current reaches IIN_LIM, the input current

loop controls the DC/DC converter. If the

input voltage drops to VIN_MIN, the input

voltage loop controls the converter. Then the

system voltage drops, and the battery FET

driver is pulled down to decrease the charge

current. This prioritizes the system power

requirement.

2. If the battery is directly connected to the

system, and VBATT > VSYS_MIN + VBATT_GD,

there is a free transition between each

control loop. In this circumstance, the charge

decreases automatically when IIN_LIM or the

voltage regulation threshold is reached.

Battery Supplement Mode

If the device reaches IIN_LIM or the input voltage

threshold, the charge current decreases. If the

input source is still overloaded when the charge

current decreases to zero, the system voltage

(VSYS) begins to drop. If VSYS drops below VBATT,

the MP2733 enters battery supplement mode, in

which the battery simultaneously powers the

system and the DC/DC converter.

The MP2733 can operate in ideal diode mode to

optimize the control transition between the

battery FET and DC/DC converter. The battery

FET enters ideal diode mode under either of the

following conditions:

1. VIN starts up from the battery supply system.

2. VBATT < VSYS_MIN, and VSYS drops below VBATT.

During ideal diode mode, the battery FET

operates as an ideal diode, and regulates the

battery FET

’s gate drive. The VDS of the battery

FET remains at about 20mV. As the discharge

current increases, the battery FET

’s gate drive

increases, and its RDS decreases until the battery

FET is fully on.

Battery Charge Profile

If VIN powers on, the CHG_CONFIG bit = 01, and

the CE

--------

pin is low, then the device automatically

completes

charging

cycle

without

host

involvement. However, the host can set different

charging parameters to optimize the charge

profile by writing to the corresponding registers

via the I2C.

A new charge cycle starts when all of the

following conditions are valid:

• Good input power is inserted

• Battery charging is enabled by the I2C, and

--------

is forced to logic low

MP2733 Datasheet(PDF) 20 Page - MPS Industries, Inc.

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