MP2624GL datasheet(18/45 Pages) MPS

18 / 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.

Battery Floating Detection

The MP2624 is capable of detecting whether a

battery is connected or not. The following

conditions initiate battery float detection:



Charging is enabled.



Auto-recharge is triggered.



Battery OVP recovery.

Before a charging cycle is initiated, the MP2624

will implement battery floating detection (see

Figure 5). Under this condition, the detection

block sinks a 3mA current for 1.5 seconds to

check if VBATT is lower than 2.1V. If VBATT is higher

than 2.1V, the battery present will be detected.

Otherwise, the MP2624 will continue to source a

3mA current and start a 1 second timer to check

when VBATT exceeds 3.6V. If VBATT is still lower

than 3.6V when the 1 second timer expires, the

battery

present

asserted.

The

system

regulation voltage is set to Max (VSYS_MIN, VBATT) +

∆V, and the charging begins to soft start. Before

the 1 second timer expires (as soon as VBATT

rises up to 3.6V), the 3mA sink current source will

be disabled, and the battery absent is detected.

In this case, the charging is disabled, and the

system regulation voltage is set to VBATT_FULL +

∆V.

Battery floating detection flow is shown in Figure

2.1V

3.6V

4.2V

VBATT

VSYS

Battery Always Absent

1.5s

(a) Charging Start-Up with Battery Absent

2.1V

3.6V

4.2V

VBATT

VSYS

1.5s

Battery Always Present

(b) Charging Start-Up with Battery Present

Figure 5: Battery Float Detection Examples

System Over-Voltage Protection

The MP2624 always monitors the voltage at

SYS. When system over-voltage is detected

(VSYS > VBATT_FULL+ ∆V +100mV), the DC/DC

converter is turned off, and the system is

∆V can be set to 50mV or 100mV via the I2C

During heavy system load transient, System OVP

often happens when load transient from heavy to

light. The timer is suspend when system OVP, so

the timer may transfer between normal and

suspend frequently, the timer counter will receive

a fault timer clock signal, then fault timer out may

happen under this condition.

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