TPS61230 PCB Design

user4517108

Hi,
I'm developing a security center with WiFi , GPRS , RF, battery backup and some other peripherals.
My pcb is good?
Vin = 2.8-5V
Vout = 4.2V
Iout = 1A
Ipk = 2.5A
Vin_on = 3.315V
Vin_off = 2.8V
Thank you very much.

C4,C2 = Tantalum Low ESR 6.3V
C1=x5r
Resistors = 0805 1%

over 9 years ago

0 Jasper Li over 9 years ago

TI__Mastermind 46905 points

1. please add a 10 or 22uF ceramic capacitor to the VOUT pin. this ceramic capacitor is critical for normal operation of the boost converter, which must be place closed to the IC and routed with strong and short track. refer to the application note "www.ti.com/.../slva773.pdf"

2. the Css can be place close the the IC. so the vias between the SS pin and the Css are unnecessary

0 Jasper Li over 9 years ago

TI__Mastermind 46905 points

the VOUT will be 5V when the VIN is 5V. please make this voltage is OK for the loads

0 user4517108 over 9 years ago in reply to Jasper Li

Prodigy 80 points

Hi, Jasper,

I made the changes you suggested me.

Below is possible saw a PCB updated.

If:
Vin > Vout

Vin = Vout ?

Thank you very much !

0 Jasper Li over 9 years ago in reply to user4517108

TI__Mastermind 46905 points

i don't see problem in the current layout now.

yes. the device operates at zero duty cycle mode at VIN>VOUT condition, and the VOUT followes the VIN.

0 user4517108 over 9 years ago in reply to Jasper Li

Prodigy 80 points

Thank you Jasper , I will make the pcb and test it soon.

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TPS61230 PCB Design