BQ25713 datasheet(99/111 Pages) TI2

99 / 111 page

Table 11-1. PCB Layout Guidelines (continued)

RULES

COMPONENTS

FUNCTION

IMPACT

GUIDELINES

Ground partition

Measurement

accuracy, regulation

accuracy, jitters,

ripple

Separate analog ground(AGND) and power grounds(PGND) is

preferred. PGND should be used for all power stage related

ground net. AGND should be used for all sensing, compensation

and control network ground for example ACP/ACN/COMP1/

COMP2/CMPIN/CMPOUT/IADPT/IBAT/PSYS. Connect all

analog grounds to a dedicated low-impedance copper plane,

which is tied to the power ground underneath the IC exposed

pad. If possible, use dedicated COMP1, COMP2 AGND traces.

Connect analog ground and power ground together using power

pad as the single ground connection point.

11.2 Layout Example

11.2.1 Layout Example Reference Top View

Based on the above layout guidelines, the buck-boost charger layout example top view is shown below including

all the key power components.

Figure 11-1. Buck-Boost Charger Layout Reference Example Top View

11.2.2 Inner Layer Layout and Routing Example

For both input sensing resistor and charging current sensing resistor, differential sensing and routing method are

suggested and highlighted in below figure. Use wide trace for gate drive traces, minimum 15 mil trace width.

Connect all analog grounds to a dedicated low-impedance copper plane, which is tied to the power ground

underneath the IC exposed pad. Suggest using dedicated COMP1, COMP2 analog ground traces shown in

below figure.

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BQ25730

SLUSE65A – FEBRUARY 2021 – REVISED JANUARY 2024

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BQ25713 Datasheet(PDF) 99 Page - Texas Instruments