MP2615B – 2A, 1- CELL LI-ION BATTERY CHARGER

MP2615B Rev. 1.0

www.MonolithicPower.com

12

3/17/2016

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OPERATION

The MP2615B is a peak current mode controlled

switching charger for a 1 cell lithium-ion and

lithium-polymer batteries. It integrates both the

high-side

and

low-side

switches

of

the

synchronous BUCK converter, which provides

high efficiency and saves the PCB space.

Charge Cycle (Mode change: TC

CC

CV)

loops to realize highly-accurate constant current

(CC) charge and constant voltage (CV) charge.

MP2615B stays in trickle-charge mode and the

output of charge current loop COMPI dominants

the control. The battery is charged by a trickle

charge mode till the trickle-charge timer is

triggered, the charging will be terminated.

The MP2615B will enter constant-current charge

mode once the battery voltage rises higher than

dominating the control and the charge current will

When the battery voltage rises over full battery

constant-voltage mode. In constant voltage mode,

precisely and the charge current will fall naturally

due to the existing equivalent internal resistance

of the battery. For the operation flow chart,

please also refer to Figure 4.

CC Charge

Threshold

CV Charge

Threshold

CC

Charge

Charge

Full

TC Charge

Current

CC Charge

Current

CV

Charge

Auto-

recharge

Auto-recharge

Threshold

Trickle

Charge

Figure 2: Li-ion Battery Charge Profile