MP2696B datasheet(30/34 Pages) MPSIND

30 / 34 page

MP2696B

– SW CHARGER WITH I2C CONTROL, BOOST OUTPUT

MP2696B Rev. 1.0

MonolithicPower.com

4/16/2021

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

Compensate the Current-Sense Resistor

The soldering tin has resistance. For a 10m

resistor

soldered

the

PCB,

the

total

resistance

between

the

resistor

pads

between 11m

Ω and 12mΩ.

One method to compensate for this resistance

consists of applying a resistor divider to the

CSP/BATT pins (see Figure 15).

BATT

MP2696B

CBATT

RS1

CSP

Figure 15: Current-Sense Compensation

After the PCB is assembled, apply a 2A DC

current

source

between

and

BATT.

Measure the voltage drop across the current-

sense resistor on its PCB pads (VCS). Calculate

R1 with Equation (12):











2 RS1

(12)

PCB Layout Guidelines

Efficient PCB layout is critical to meet specified

noise, efficiency, and stability requirements. For

the best results, follow the guidelines below:

1. Place the PMID capacitor as close as

possible to the PMID and PGND pins using

a short copper plane connection. Place the

PMID capacitor on the same layer as the IC.

2. Minimize the high-frequency current path

loop between the PMID capacitor and the

switching power MOSFETs (PMID pin to

capacitor, capacitor to PGND pin).

Connect the IC’s power pin to as many

copper planes as possible to conduct heat

away from the IC.

4. Place decoupling capacitors (e.g. the VCC

pin capacitor) as close as possible to the IC

pins, and make the connection as short as

possible.

5. Ensure the number and physical size of the

vias is sufficient for a current path.

MP2696B Datasheet(PDF) 30 Page - MPS Industries, Inc.

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