MP2636 datasheet(39/40 Pages) MPS

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MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

MP2636 Rev.1.01

www.MonolithicPower.com

5/1/2018

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

noise, efficiency and stability requirements. The

following design considerations can improve

circuit performance:

1) Route the power stage adjacent to their

grounds. Aim to minimize the high-side switching

node (SW, inductor) trace lengths in the high-

current paths.

Keep the switching node short and away from all

small control signals, especially the feedback

network.

Place the input capacitor as close as possible to

the VIN and PGND pins. The local power input

capacitors, connected from the SYS to PGND,

must be placed as close as possible to the IC.

Place the output inductor close to the IC and

connect

the

output

capacitor

between

the

inductor and PGND of the IC.

2) For high-current applications, the power pads

for IN, SYS, SW, BATT and PGND should be

connected to as many coppers planes on the

board

possible.

This

improves

thermal

performance because the board conducts heat

away from the IC.

3) The PCB should have a ground plane

connected directly to the return of all components

through vias (e.g., two vias per capacitor for

power-stage capacitors, one via per capacitor for

small-signal components). A star ground design

approach is typically used to keep circuit block

currents

isolated

(power-signal/control-signal),

which

reduces

noise-coupling

and

ground-

bounce issues. A single ground plane for this

design gives good results.

4) Place ISET, OLIM and ILIM resistors very

close to their respective IC pins.

GND

SYS

BATT

GND

AGND

VIN

SYS

VIN

VCC

ILIM

PWIN

TMR

BOOST

SYS

VIN

CSP

BATT

AGND

SYS

VIN

Figure 15: PCB Layout Guide

MP2636 Datasheet(PDF) 39 Page - Monolithic Power Systems

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