MP2733 datasheet(21/51 Pages) MPSIND

21 / 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.

• There is no thermistor fault on the NTC pin

• There is no safety timer fault

• The BATTFET is not forced to turn off

The MP2733 provides four main charging

phases: trickle charge, pre-charge, constant

current charge, and constant voltage charge.

Each phase is described below:

Phase 1 (trickle charge): When the input power

qualifies as a good power supply, the MP2733

checks VBATT to determine whether trickle charge

is required. If VBATT is below VBATT_TC (2.0V), a

trickle-charge current is applied on the battery,

which helps reset the protection circuit in the

battery pack. The trickle-charge current can be

set via REG06h, bit[4]. If REG06h, bit[4] is set to

1, the trickle-charge current is 185mA. If

REG06h, bit[4] is set to 0, the trickle-charge

current is 145mA.

Phase 2 (pre-charge): If VBATT exceeds VBATT_TC,

the MP2733 starts to safely pre-charge the

depleted battery until VBATT reaches the pre-

charge to fast charge threshold (VBATT_PRE). If

VBATT_PRE is not reached before the pre-charge

timer (1hr) expires, the charge cycle ends and a

corresponding timeout fault signal is asserted.

The pre-charge current can be configured via the

I2C register REG06h, bits[7:4], and can be set

between 150mA and 750mA.

Phase 3 (constant current charge): If VBATT

exceeds VBATT_PRE set via REG05h, bit[7], the

MP2733 enters a constant current charge (fast

charge) phase. The fast charge current can be

configured up to 3A via REG05h, bits[5:0].

There are two stages of fast charge. First, the

battery FET works linearly to charge the battery

with a fast charge current. Once VBATT exceeds

VSYS_MIN + VBATT_GD, the battery FET fully turns on.

The charge current loop is implemented by the

PWM control of the buck converter.

Phase 4 (constant voltage charge): When VBATT

reaches the configurable float voltage (VBATT_REG)

set via REG07h, bits[7:1], the charge current

begins to taper off.

The charge cycle is considered complete when

the

charge

current

reaches

the

battery

termination threshold (ITERM) set via REG06h,

bits[3:0] after a 200ms termination deglitch time

(assuming that the termination function is

enabled if REG08h, bit[7] is set to 1). If ITERM is

not reached before the safety charge timer

expires (see the Safety Timer section on page

24), the charge cycle ends, and a corresponding

timeout fault signal is asserted.

Figure 6 shows the charging profile.

Trickle Charge

Charge

Current

Battery

Voltage

Pre-Charge

Constant Voltage Charge

CC Fast Charge

Charge Done

VBATT_REG

VBATT_PRE

VBATT_TC

ITC

ITERM

IPRE

ICC

VSYS_REG_MIN

System

Voltage

Figure 6: Battery Charging Profile

MP2733 数据表(PDF) 21 Page - MPS Industries, Inc.

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