TPS5210

PROGRAMMABLE SYNCHRONOUS BUCK REGULATOR CONTROLLER

SLVS171A − SEPTEMBER 1998 − REVISED MAY 1999

20

POST OFFICE BOX 655303

APPLICATION INFORMATION

Table 2. Power Stage Components

Ref

Function

12-V−Input Power Stage Components

Ref

Des

Function

4−A Out

8−A Out

12−A Out

20−A Out

40−A Out

C101

Input Bulk

Capacitor

Sanyo,

16SV100M,

100−uF, 16−V, 20%

Sanyo,

16SA470M,

2 x 470−uF, 16−V, 20%

Sanyo,

16SA470M,

2 x 470−uF, 16−V, 20%

Sanyo,

16SA470M,

3 x 470−uF, 16−V, 20%

Sanyo,

16SA470M,

4 x 470−uF, 16−V, 20%

C102

Input

Mid−Freq

Capacitor

muRata,

GRM42−6Y5V105Z025A

1.0−uF, 25−V,

+80%−20%,

Y5V

muRata,

GRM42−6Y5V225Z016A

2.2−uF, 16−V,

+80%−20%,

Y5V

muRata,

GRM42−6Y5V225Z016A

2.2−uF, 16−V,

+80%−20%,

Y5V

muRata,

GRM42−6Y5V105Z025A

3 x 1.0−uF, 25−V,

+80%−20%,

Y5V

muRata,

GRM42−6Y5V105Z025A

4 x 1.0−uF, 25−V,

+80%−20%,

Y5V

C103

Input

Hi−Freq

Bypass

Capacitor

muRata,

GRM39X7R104K016A

0.1−uF, 16−V, X7R

muRata,

GRM39X7R104K016A,

0.1−uF, 16−V, X7R

muRata,

GRM39X7R104K016A,

2 x 0.1−uF, 16−V, X7R

muRata,

GRM39X7R104K016A,

3 x 0.1−uF, 16−V, X7R

muRata,

GRM39X7R104K016A,

4 x 0.1−uF, 16−V, X7R

C104

Snubber

Capacitor

muRata,

GRM39X7R102K050A,

1000−pF, 50−V, X7R

muRata,

GRM39X7R102K050A,

1000−pF, 50−V, X7R

muRata,

GRM39X7R102K050A,

2 x 1000−pF, 50−V, X7R

muRata,

GRM39X7R102K050A,

3 x 1000−pF, 50−V, X7R

muRata,

GRM39X7R102K050A,

4 x 1000−pF, 50−V, X7R

C105

Output Bulk

Capacitor

Sanyo,

6TPB150M,

3 x 150−uF, 6.3−V, 20%

Sanyo,

4SP820M,

820−uF, 4−V, 20%

Sanyo,

4SP820M,

2 x 820−uF, 4−V, 20%

Sanyo,

4SP820M,

3 x 820−uF, 4−V, 20%

Sanyo,

4SP820M,

4 x 820−uF, 4−V, 20%

C106

Output

Hi−Freq

Bypass

Capacitor

muRata,

GRM39X7R104K016A,

0.1−uF, 16−V, X7R

muRata,

GRM39X7R104K016A,

0.1−uF, 16−V, X7R

muRata,

GRM39X7R104K016A,

2 x 0.1−uF, 16−V, X7R

muRata,

GRM39X7R104K016A,

3 x 0.1−uF, 16−V, X7R

muRata,

GRM39X7R104K016A,

4 x 0.1−uF, 16−V, X7R

L101

Input

Filter

Inductor

CoilCraft,

DO1608C−332,

3.3−uH, 2.0−A

Coiltronics,

UP2B−2R2,

2.2−uH, 7.2−A

Coiltronics,

UP2B−2R2,

2.2−uH, 7.2−A

Coiltronics,

UP3B−1R0,

1−uH, 12.5−A

Coiltronics,

UP3B−1R0,

1−uH, 12.5−A

L102

Output

Filter

Inductor

CoilCraft,

DO3316P−332,

3.3−uH, 6.1−A

Coiltronics,

UP3B−2R2,

2.2−uH, 9.2−A

Coiltronics,

UP4B−1R5,

1.5−uH, 13.4−A

MicroMetals,

T68−8/90 Core w/7T

#16, 1.0−uH, 25−A

Pulse Engineering,

P1605,

1.0−uH, 50−A

R101

Lo−Side

Gate

Resistor

3.3−Ohm,

1/16−W, 5%

3.3−Ohm,

1/16−W, 5%

2 x 3.3−Ohm,

1/16−W, 5%

3 x 3.3−Ohm,

1/16−W, 5%

4 x 3.3−Ohm,

1/16−W, 5%

R102

Snubber

Resistor

2.7−Ohm,

1/10−W, 5%

2.7−Ohm,

1/10−W, 5%

2 x 2.7−Ohm,

1/10−W, 5%

3 x 2.7−Ohm,

1/10−W, 5%

4 x 2.7−Ohm,

1/10−W, 5%

Q101

Power

Switch

Siliconix, Si4410,

NMOS, 13−mOhm

Siliconix, Si4410,

NMOS, 13−mOhm

Siliconix, 2 x Si4410,

NMOS, 13−mOhm

Siliconix, 2 x Si4410,

NMOS, 13−mOhm

IR, 2 x IRF7811,

NMOS, 11−mOhm

Q102

Synchron-

ous

Switch

Siliconix, Si4410,

NMOS, 13−mOhm

Siliconix, Si4410,

NMOS, 13−mOhm

Siliconix, 2 x Si4410,

NMOS, 13−mOhm

Siliconix, 3 x Si4410,

NMOS, 13−mOhm

IR, 4 x IRF7811,

NMOS, 11−mOhm

Nominal Frequency†

220 KHz

330 KHz

240 KHz

140 KHz

168 KHz

Hysteresis Window

20 mV

20 mV

20 mV

20 mV

10 mV

† Nominal frequency measured with Vo set to 2 V.

The values listed above are recommendations based on actual test circuits. Many variations of the above are

possible based upon the desires and/or requirements of the user. Performance of the circuit is equally, if not

more, dependent upon the layout than on the specific components, as long as the device parameters are not

exceeded. Fast-response, low-noise circuits require critical attention to the layout details. Even though the

operating frequencies of typical power supplies are relatively low compared to today’s microprocessor circuits,

the power levels and edge rates can cause severe problems both in the supply and the load. The power stage,

having the highest current levels and greatest dv/dt rates, should be given the greatest attention.