MP2624GL datasheet(16/45 Pages) MPS

16 / 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.

VSYS regulation is shown in Figure 3.

50mV

VSYS_MIN

60mV

vBATT

vSYS

VSYS_MIN + 110mV

100mV

VSYS_MIN

60mV

vBATT

vSYS

VSYS_MIN + 160mV

Figure 3: VSYS Variation with VBATT

The MP2624 monitors continuously the voltage

at SYS. Once the system voltage is 100mV over

VBATT_FULL + ∆V, it is detected as a VSYS OVP

condition. The MP2624 will turn off the DC/DC

converter, and then the system will be powered

by the battery.

Battery Charge Profile

The MP2624 provides four main charging phases:

trickle

charge,

pre-charge,

constant-current

charge, and constant-voltage charge.

Phase 1 (Trickle Charge):

When the input power is qualified as a good

power supply, the MP2624 checks the battery

voltage to decide if trickle charge is required. If

the battery voltage is lower than VBATT_SHORT

(2.1V), a charging current of 128mA is applied on

the battery, which helps reset the protection

circuit in the battery pack.

Phase 2 (Pre-Charge):

When the battery voltage exceeds the VBATT_SHORT,

the MP2624 starts to pre-charge safely the

deeply depleted battery until the battery voltage

reaches the “pre-charge to fast-charge threshold”

(VBATT_PRE). If VBATT_PRE is not reached before the

pre-charge timer expires, the charge cycle ends,

and a corresponding timeout fault signal is

asserted. The pre-charge current can be

programmed via the I2C register REG03 Bit [7:4].

Phase 3 (Constant-Current Charge)

When the battery voltage exceeds VBATT_PRE set

via the REG04 Bit [1], the MP2624 enters a

constant-current charge (fast charge) phase. The

fast-charge current can be programmed as high

as 4.5A via the REG02 Bit [7:2].

Phase 4 (Constant-Voltage Charge)

When the battery voltage rises to the pre-

programmable charge full voltage (VBATT_FULL) set

via the REG04 Bit [7:2], the charge current

begins to taper off.

The charge cycle is considered complete when

the charge current reaches the battery full

termination threshold (IBF) set via the REG03 Bit

[3:0], assuming the termination function is

enabled by REG05[7] = 1. If IBF is not reached

before the safety charge timer expires (see

“Safety Timer” section), the charge cycle ends,

and the corresponding timeout fault signal is

asserted.

Figure 4 shows the battery charge profile.

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