TPS60120, TPS60121, TPS60122, TPS60123, TPS60124, TPS60125

REGULATED 200-mA HIGH EFFICIENCY CHARGE PUMP

DC/DC CONVERTERS

SLVS257B – NOVEMBER 1999 – REVISED AUGUST 2000

19

POST OFFICE BOX 655303

APPLICATION INFORMATION

board layout

Careful board layout is necessary due to the high transient currents and switching frequency of the converter.

All capacitors should be soldered in close proximity to the IC. Connect ground and power ground pins through

a short, low-impedance trace. A PCB layout proposal for a two-layer board is given in Figure 27. The bottom

layer of the board carries only ground potential for best performance.

An evaluation module for the TPS60120 is available and can be ordered under product code

TPS60120EVM–142. The EVM uses the layout shown in Figure 27. The layout also provides improved thermal

performance as the exposed leadframe of the PowerPAD package can be soldered to the PCB.

Figure 27. Recommended PCB Layout for

TPS6012X

Figure 28. Component Placement

Table 5. Component Identification

IC1

TPS6012x

C1, C2

Flying capacitors

C3, C6

Input capacitors

C4, C5

Output capacitors

C7

Stabilization capacitor for LBI

R1, R2

Resistive divider for LBI

R3

Pullup resistor for LBO

The best performance of the converter is achieved with the additional bypass capacitors C5 and C6 at input and

output. Capacitor C7 should be included if the large line transients are expected. The capacitors are not

required. They can be omitted in most applications.