MP2632B datasheet(35/43 Pages) MPS

35 / 43 page

MP2632B

– ALL-IN-ONE, 3A SW CHARGER, 3A BOOST

MP2632B Rev. 1.0

www.MonolithicPower.com

3/9/2018

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

The MP2632B 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 MP2632B 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 boost mode is not on,

the MP2632B is in sleep mode. The high-side

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 MP2632B integrates a three-phase output

OCP.

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 of 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

120μs 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

reaches the foldback peak-current limit of

the low-side N-channel MOSFET (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 MP2632B enters

thermal shutdown. The MP2632B 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 MP2632B 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 15 for PB action).

Automatic Output DP2/DM2 Signaling

The MP2632B sets the DP2/DM2 signal based

on the load applied on USB2 in boost mode. In

pass-through mode, DP2 and DM2 are set

according to DP1 and 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 MOSFET is off when

PB is pulled from high to low for more than

1.5ms twice within one second, the drive

MOSFET is turned on. Conversely, if the torch

drive MOSFET is on, the drive MOSFET is

turned off.

In MP2632B, torch light control is independent

from the automatic-off function in light load,

although it consumes battery current in boost

mode. The light-load automatic-off function is

still valid, even if the torch light is on.

If the torch light is on, the automatic off function

is still valid. If the MP2632B turns off the boost

automatically, the torch light remains on.

MP2632B Datasheet(PDF) 35 Page - Monolithic Power Systems

MP2632B Datasheet(HTML) 35 Page - Monolithic Power Systems

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