MPQ5480GC datasheet(13/17 Pages) MPS

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MPQ5480 – INTEGRATED CHARGER WITH 5V/100mA DCDC SYNC REGULATOR

MPQ5480 Rev. 1.0

www.MonolithicPower.com

3/11/2016

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

OPERATION

MPQ5480 is a complete power management

solution for Lithium-Ion battery powered device. It

integrates a CC/CV charger, cell protection

function, high efficiency synchronous buck

regulator and a push-button controller.

MPQ5480 has following modes:

Shutdown: When VBATT < Vth_UVLO, system draws

only leakage current from battery and re-

activation is only possible by connecting a

charger.

Charging: Charger is connected to system.

DC/DC, Vo2 and push-button are de-activated.

After charger is removed system will be in

Normal Operation OFF condition.

Normal Operation (ON/OFF): VBATT > Vth_UVLO

and no charger is connected. In this mode the

system can be turned ON or OFF by toggling the

push-button.

Charger

The MPQ5480 integrated linear charger provides

CC/CV charging algorithms. It changes charge

modes automatically depending on the battery

status. A typical charging profile is shown on

Figure 2.

Figure 2: Typical Charging Profile

The

defined

charging

current,

ICHG

programmed through resistor RICHG from ICHG

pin to GND. The relationship of the charging

current and RICHG is shown in Table 1 and Figure

Table 1: ICHG vs. RICHG

ICHG (mA)

RICHG (kΩ)

7.8

169

124

110

100

21.2

34.4

8.25

100

2.49

127

Figure 3: ICHG vs. RICHG

When battery voltage falls below the trickle falling

threshold (Vth_trich with ~180mV hysteresis), the

charging current is limited to 10% of the

programmed value to trickle charge the fully

depleted battery. After the battery voltage

reaches the trickle rising threshold (Vth_trich), the

charger begins to charge at a constant current of

the programmed value (ICHG). ICHG is typically set

to C/2. This is referred to as Constant Current

(CC) mode. Once the battery voltage reaches

CV-Level VCV (e.g. 4.10V), the charger will

operate in Constant Voltage (CV) mode until the

battery is fully charged. Charging is terminated

when the current into the battery falls to 10% of

the defined charging current ICHG or the charge

termination timer (3.6h) expires.

MPQ5480 also provides an ON Chip temperature

sensor to prevent charging outside normal

battery temperature limits. The charger will only

start to charge when the die temperature is

between 6°C and 49°C.

ICHG vs. RICHG

100

120

140

80 100 120 140 160 180

RICHG (kΩ)

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