Texas Instruments Evaluation Module for BQ24133 Synchronous Switch-Mode Li-Ion and Li-Polymer Battery Charge BQ24133EVM- BQ24133EVM-715-15V Datenbogen
Produktcode
BQ24133EVM-715-15V
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PCB Layout Guideline
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PCB Layout Guideline
1. It is critical that the exposed thermal pad on the backside of the bq24133 package be soldered to the
PCB ground. Ensure that sufficient thermal vias are right underneath the IC, connecting to the ground
plane on the other layers.
plane on the other layers.
2. The control stage and the power stage must be routed separately. At each layer, the signal ground and
the power ground are connected only at the thermal pad.
3. Charge current sense resistor must be connected to SRP and SRN with a Kelvin contact. The area of
this loop must be minimized. The decoupling capacitors for these pins must be placed as close to the
IC as possible.
IC as possible.
4. Input current sense resistor must be connected to ACP, ACN with a Kelvin contact. The area of this
loop must be minimized. The decoupling capacitors for these pins should be placed as close to the IC
as possible.
as possible.
5. Decoupling capacitors for VREF, AVCC, and REGN must make the interconnections to the IC as short
as possible.
6. Decoupling capacitors for BAT must be placed close to the corresponding IC pins, and make the
interconnections to the IC as short as possible.
7. Decoupling capacitor(s) for the charger input must be placed close to SW and PGND.
8. Take the EVM layout for design reference.
8. Take the EVM layout for design reference.
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SLUU476 – December 2010
bq24133EVM Stand-Alone Synchronous, Switch-Mode, Battery-Charge
Controller With Integrated N-MOSFETs and Power Path Selector
© 2010, Texas Instruments Incorporated