TPS62870 datasheet(48/66 Pages) TI2

48 / 66 page

When calculating worst-case component values, use the value calculated above as the minimum output

capacitance required. For ceramic capacitors, the maximum capacitance when considering tolerance, DC bias,

temperature, and aging effects is typically two times the minimum capacitance. In this case, the maximum

capacitance COUT(max) is 406μF.

Table 9-4. List of Recommended Output Capacitors

CAPACITANCE

DIMENSIONS

VOLTAGE RATING

MANUFACTURER, PART NUMBER(1)

MM (INCH)

22μF ±20%

2012 (0805)

6.3V

TDK, CGA4J1X7T0J226M125AC

22μF ±10%

2012 (0805)

6.3V

Murata, GCM31CR71A226KE02

47μF ±20%

3216 (1206)

TDK, CGA5L1X7T0G476M160AC

47μF ±20%

2012 (1210)

6.3V

Murata, GCM32ER70J476ME19

100μF ±20%

3225 (1210)

TDK, CGA6P1X7T0G107M250AC

100μF ±20%

3216 (1210)

6.3V

Murata, GRT32EC70J107ME13

(1)

See Section 10.1.1.

9.2.2.5 Selecting the Compensation Capacitor, CC

First, use Equation 19 to calculate the bandwidth of the inner loop:

BWINNER= τ

2π× LNɸ×COUTmax

(19)

BWINNER= 12.5×10–6

2π×110×10–91×406×10–6=45kHz

(20)

Next, calculate the product of gmRZ:

gm×RZ=1.5×10–3×2.4×103=3.6

(21)

If gmRZ > than 1, use Equation 22 to calculate the recommended value of CC. If gmRZ < 1, use Equation 24 to

calculate the recommended value of CC.

CC= 2

π×BWINNER×gm×RZ2

(22)

CC=

π×45×103×1.5×10–3× 2.4×1032=1.638nF

(23)

The closest standard value from the E12 series is 1.8nF.

CC= 2×gm

π×BWINNER

(24)

9.2.2.6 Selecting the Compensation Capacitor, CC2

The compensation capacitor, CC2, is an optional capacitor that TI recommends the user include to bypass high-

frequency noise away from the COMP pin. The value of this capacitor is not critical; 10pF or 22pF capacitors are

an excellent choice for typical applications.

TPS62870, TPS62871, TPS62872, TPS62873

SLVSGC5E – JANUARY 2023 – REVISED OCTOBER 2025

www.ti.com

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