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PCB Layout Guideline

PCB Layout Guideline

1. It is critical that the exposed thermal pad on the backside of the bq24650 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.

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, 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.

4. Decoupling capacitors for VREF, VCC, REGN must make the interconnections to the IC as short as

possible.

5. Decoupling capacitors for BAT must be placed close to the corresponding IC pins, and make the

interconnections to the IC as short as possible.

6. Decoupling capacitor(s) for the charger input must be placed close to the Q1A drain and Q1B source.
7. Take the EVM layout for design reference.

SLUU444A – August 2010 – Revised October 2010

bq24650EVM Synchronous, Switch-Mode, Battery Charge Controller for Solar

Power

Содержание bq24650

Страница 1: ...Summary 5 2 1 Definitions 5 2 2 Safety 5 2 3 Quality 5 2 4 Apparel 5 2 5 Equipment 5 2 6 Equipment Setup 6 2 7 Procedure 7 3 PCB Layout Guideline 9 4 Bill of Materials Board Layout and Schematic 10 4...

Страница 2: ...nt current and constant voltage Charge is terminated when the current reaches one tenth of the fast charge rate A programmable fast charge timer provides a safety backup The precharge timer is fixed a...

Страница 3: ...components Operating junction temperature range TJ 0 125 C The bq24650EVM board requires a regulated supply approximately 1 V minimum above the regulated voltage of the battery pack to a maximum inpu...

Страница 4: ...RN The full scale differential voltage between SRP and SRN is fixed at 40 mV 3 It is set at 2 Adc from the factory 4 bq24650EVM Synchronous Switch Mode Battery Charge Controller for Solar SLUU444A Aug...

Страница 5: ...e unit under test has failed Observe A B Observe if A B occur If they do not occur the unit under test has failed Assembly drawings have location for jumpers test points and individual components 2 2...

Страница 6: ...A current 2 6 Equipment Setup 1 Set the power supply 1 PS 1 for 21 V 500 mVdc 2 5 A 0 1 A current limit and then turn off supply 2 Connect the output of PS 1 in series with a current meter multimeter...

Страница 7: ...OAD 2 to be 10 5 V Measure I J2 VOUT 2 A 200 mA Observe D4 STAT1 ON D5 STAT2 OFF Open 2 3 of JP1 Measure I J2 VOUT 0 A 100 mA Observe D4 STAT1 OFF D5 STAT2 OFF Connect 2 3 of JP1 Internal TS Measure I...

Страница 8: ...T decreases from 2 A toward 0 A while V J1 VIN become constant 17 8 V 500 mV Ensure that I J2 VOUT 0 A 100 mA and J2 VSYS 2 4 A 200 mA 2 7 7 Test Complete Turn off the power supply and remove all conn...

Страница 9: ...ntact The area of this loop must be minimized The decoupling capacitors for these pins must be placed as close to the IC as possible 4 Decoupling capacitors for VREF VCC REGN must make the interconnec...

Страница 10: ...erPak SI7288DP T1 Vishay Siliconix 1 Q2 2N7002 7 F MOSFET N ch 60V 115mA 1 2 SOT23 2N7002 7 F Diodes 2 R1 R2 3 9 Resistor Chip 1 4W 5 1206 STD STD 1 R3 10 Resistor Chip 1 8W 5 805 STD STD 0 R4 R8 Open...

Страница 11: ...Schematic 4 2 Board Layout Figure 2 Top Layer 11 SLUU444A August 2010 Revised October 2010 bq24650EVM Synchronous Switch Mode Battery Charge Controller for Solar Power Submit Documentation Feedback C...

Страница 12: ...ematic www ti com Figure 3 Second Layer 12 bq24650EVM Synchronous Switch Mode Battery Charge Controller for Solar SLUU444A August 2010 Revised October 2010 Power Submit Documentation Feedback Copyrigh...

Страница 13: ...yout and Schematic Figure 4 Third Layer 13 SLUU444A August 2010 Revised October 2010 bq24650EVM Synchronous Switch Mode Battery Charge Controller for Solar Power Submit Documentation Feedback Copyrigh...

Страница 14: ...ematic www ti com Figure 5 Bottom Layer 14 bq24650EVM Synchronous Switch Mode Battery Charge Controller for Solar SLUU444A August 2010 Revised October 2010 Power Submit Documentation Feedback Copyrigh...

Страница 15: ...out and Schematic Figure 6 Top Assembly 15 SLUU444A August 2010 Revised October 2010 bq24650EVM Synchronous Switch Mode Battery Charge Controller for Solar Power Submit Documentation Feedback Copyrigh...

Страница 16: ...matic www ti com Figure 7 Bottom Assembly 16 bq24650EVM Synchronous Switch Mode Battery Charge Controller for Solar SLUU444A August 2010 Revised October 2010 Power Submit Documentation Feedback Copyri...

Страница 17: ...ematic 4 3 Schematic Figure 8 bq24650EVM Schematic 17 SLUU444A August 2010 Revised October 2010 bq24650EVM Synchronous Switch Mode Battery Charge Controller for Solar Power Submit Documentation Feedba...

Страница 18: ...duct This notice contains important safety information about temperatures and voltages For additional information on TI s environmental and or safety programs please contact the TI application enginee...

Страница 19: ...change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of thes...