MP2632B datasheet(32/43 Pages) MPS

32 / 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.

VDP_SRC

VLGC_HI

IDP_SRC

CHG_DET

VDAT_RE

IDM_SINK

DP1

DM1

RDM_DWN

Figure 11: USB Port Detection

The MP2632B starts DP1/DM1 detection when

the input source plugs in. DP1/DM1 detection

has two steps: data contact detection (DCD)

and primary detection.

DCD detection uses a current source to detect

when the data pins have made contact during

an attach event. The protocol for data contact

detection is as follows:

 The power device (PD) detects if V

asserted.

 The PD turns on DP1 I

DP_SRC and the DM1

pull-down resistor for 40ms.

 The PD waits for DP1 to be low.

 The PD turns off I

DP_SRC and the DM1 pull-

down resistor when DP1 is detected to be

low or when the 40ms timer expires.

DCD allows the PD to begin primary detection

once the data pins have made contact. Once

the data contact is detected, the MP2632B

jumps to the primary detection immediately. If

the data contact is not detected, the MP2632B

jumps to the primary detection automatically

after 300ms from the beginning of the DCD.

Primary

detection

used

distinguish

between the USB host (or SDP) and different

types of charging ports.

During primary detection, the PD turns on

VDP_SRC on DP1 and IDM_SINK on DM1. If the

portable device is attached to a USB host, DM1

is low. If the power device is attached to CDP,

DCP, or another dedicated charging port, DM1

remains high.

To be compatible with different capacities of the

input

source,

set

the

input

current

limit

according to the values listed in Table 2.

Table 2: Input Current Limit Setting

DP1/DM1 Detection

IIN_LMT

Floating

500mA

SDP

500mA

CDP or DCP

Set through RILIM

USB detection runs once VIN is detected and is

independent of the charge enable status. After

the DP1/DM1 detection is done, the MP2632B

sets the input current limit as shown in Table 2.

When the detection algorithm is completed,

DP1 and DM1 enter Hi-Z with approximately

4pF of capacitive load.

External Input Current Limit Setting

The MP2632B has a dedicated pin (ILIM) used

to program the input current limit when CDP or

DCP is detected. The current at ILIM is a

fraction of the input current. The ILIM voltage

indicates the average input current of the

switching

regulator

determined

the

resistor value between ILIM and GND. As the

input current approaches the programmed input

current limit, the charge current is reduced to

give priority to the system power. Determine the

input current-limit threshold with Equation (4):

ILIM

40(k )

(A)

(k )







(4)

Input Voltage Regulation in Charge Mode

In charge mode, if the input power source is not

sufficient enough to support both the charge

current and the system load current, the input

voltage

decreases.

the

input

voltage

approaches the 4.65V input voltage regulation

threshold preset internally, the charge current is

reduced to give priority to the system power

and maintain proper regulation of the input

voltage.

MP2632B Datasheet(PDF) 32 Page - Monolithic Power Systems

MP2632B Datasheet(HTML) 32 Page - Monolithic Power Systems

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