MP2632 datasheet(31/37 Pages) MPS

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MP2632

– ALL-IN-ONE, 3A SW CHARGER, 3A BOOST

MP2632 Rev.1.0

www.MonolithicPower.com

6/24/2016

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

Automatic On when Load is Applied

The boost turns on automatically when PB is

pulled from high to low for more than 1.5ms, or

when the load is plugged in to USB2 using the

PB control.

To detect the USB load plug-in, the RC network

is connected to the USB port shield floating in the

PCB. Once the USB load is inserted, the USB

connector shield is grounded through the USB

load. A short pulse (high to low for more than

1.5ms) is generated in PB, resulting in the start of

boost.

An RC network can also be connected in VBUS of

the USB output port. During load insertion, the

load input cap generates a high-to-low pulse for

more than 1.5ms to start the boost (see Figure

15). The circuit in the dash frame is the automatic

load detection circuit. M2 is used to decouple the

USB port from the VSYS cap (C2, CSYS), and M1 is

used to drive M2.

Once a phone is plugged in, the voltage at CUSB is

pulled down because the input cap inside the

phone is far larger than CUSB, so the falling edge

is delivered to PB to enable boost automatically.

M3 is used to cut off PB to and from the USB port

when boost is turned on. The PB state is not

affected by the spec of the inserted load of the

USB port. Choose M3 with a low turn-on

threshold (-0.7V is recommended) which can

ensure that it is fully on when the load is inserted

and that its on resistance does not cause too

much of a voltage drop.

4-LED Driver for Voltage-Based Fuel

Gauge

The IC provides 4-LED drivers for a voltage-

based fuel gauge. The driver is connected to an

internal open-drain FET. The 4-LED indication

values are shown in Table 4.

The LED threshold can be programmed using a

fuse. Each threshold can be adjusted from

150mV to 200mV with 50mV steps from their

default value.

The LED threshold is also adjusted automatically

based

on the

VBAT_REG setting. The VOREG

difference is considered to be offset for LED

thresholds.

During the voltage measurement, the battery

impedance (50m

Ω) should be compensated

based on the battery current to get a precise

battery voltage for fuel gauge indication.

Indication for Fault Flag in Boost Mode

To minimize the power consumption of the

battery, the indication is active once PB is short-

pushed in normal discharge operation, and turns

off after five seconds automatically.

Table 4: Indication at Discharge Mode

Operation status

LED1 to LED4 state

Normal discharging

Depending on the battery

voltage, LEDx is turned off.

(refer to Fuel Gauge

Indication section)

NTC fault

LED1 to LED4 are all blinking

at 1Hz

st Push)

nd Push)

rd Push)

th Push)

2.5s

Boost EN

Off

2.5s

TMR

2.5s

1.5ms

2.5s

1.5ms

2.5s

Figure 15: PB Action Profile

MP2632 Datasheet(PDF) 31 Page - Monolithic Power Systems

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