MP2632 datasheet(30/37 Pages) MPS

30 / 37 page

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.

The MP2632 can operate in CC mode when the

current limit is reached, and VIN does not drop to

the down mode threshold (VBATT + 100mV) (see

Figure 14).

SCP

VBATT+100mV

VSYS_REG

IOLIM

VSYS

ISYS

Figure 14: Boost Output U-I Curve

The MP2632 not only has CC mode during the

charging

process,

but also has CC mode

operation in boost mode for various applications.

SYS to BATT Block Protection

When there is no VIN and the boost mode is not

on, the part is in sleep mode. The HS switch

implements the body switch function, which

connects the body diode of the switch to the

high-voltage side of SW and SYS, which blocks

the external voltage on SYS from flooding into

the battery.

SYS Output Over-Current Protection (OCP)

The IC integrates a three-phase output over-

current protection.

1. Phase one (boost mode output current limit):

When

the

output

current

exceeds

the

programmed output current limit, the output

constant current loop controls the output

current, the output current remains at its limit

(IOLIM), and VSYS decreases.

2. Phase two (down mode): When VSYS drops

below VBATT + 100mV and the output current

loop remains in control, the boost converter

enters down mode and shuts down after

120

μs of blanking time.

3. Phase three (short-circuit mode): When VSYS

drops below 4.0V (2V during boost soft start),

the boost converter shuts down immediately

once the inductor current hits the foldback

peak-current limit of the low-side N-FET. The

boost

converter

can

also

recover

automatically after a 1ms deglitch period.

Thermal Shutdown Protection

The thermal shutdown protection is also active in

boost mode. Once the junction temperature rises

higher

than

150°C,

the

enters

thermal

shutdown and does not resume normal operation

until the junction temperature drops below 120°C.

Automatic Off at Light Load

The boost turns off automatically if the load

current at BATT is below the typical 75mA value

for 16 seconds.

The MP2632 also features a long-push action on

PB to shut down the boost manually. A low push

on PB longer than 2.5 seconds is defined as a

long push (see Figure 14 for PB action).

Automatic Output DP2/DM2 Signaling

In boost mode, the IC sets the DP2/DM2 signal

based on the load applied on USB2. In pass-

through mode, DP2 and DM2 are set according

to DP1/DM1 detection results.

In boost mode, DM2/DP2 are set based on three

types of signals: DM2/DP2 separately biased

with a 2.7V voltage signal (default), DM2/DP2

shorted, and DM2/DP2 shorted with a 1.2V bias.

In pass-through mode, DM2/DP2 are connected

together if the dedicated charger ports are

detected, and pulled down to ground separately

with a 15k

Ω resistor if SDP is identified.

Torch Control

If the internal torch drive FET is off when PB is

pulled from high to low for more than 1.5ms twice

within one second, the drive FET is turned on.

Conversely, if the torch drive FET is on, the drive

FET is turned off.

Once the torch light is turned on, the automatic

off function is blocked.

PB Control

PB is used to control the enable of boost mode.

Pull PB from high to low for more than 1.5ms to

enable boost mode; pull PB from high to low for

2.5s to disable boost mode.

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