SLVSE46 Data sheet

SLVSE46A November 2017 – January 2018

PRODUCTION DATA.

8.2.2 Detailed Design Procedure

To maximize performance, the TPS65680 device has been optimized for a relatively narrow range of component values, and customers are strongly recommended to use the application circuit shown in with the components listed in Table 216. If other components are used, customers are recommended to characterize performance fully to ensure proper operation.

Care should be applied to the choice of external components since they greatly affect overall performance. The TPS65680 was developed with the twin goals of high performance and small/low-profile solution size. Since these two goals are often in direct opposition to one another (e.g. larger capacitors tend to achieve higher effective capacitance values), some trade-off is always necessary.

Capacitors must provide adequate effective capacitance under the applicable dc bias conditions they experience in the application. MLCC capacitors typically exhibit only a fraction of their nominal capacitance under real-world conditions, and this must be taken into consideration when selecting them. This problem is especially acute in low profile capacitors, in which the dielectric field strength is higher than in taller components. In general, the capacitance values shown in circuit diagrams in this data sheet refer to the effective capacitance after dc bias effects have been taken into account. Reputable capacitor manufacturers provide capacitance versus dc bias curves that greatly simplify component selection.

The following tables list some components suitable for use with the TPS65680. The list is not exhaustive – other components may exist that are equally suitable (or better), however, these components have been proven to work well and were used extensively during the development of the TPS65680.

Table 216. Recommended External Components

DESCRIPTION		PART NUMBER	MANUFACTURER⁽²⁾	SIZE (LxWxH)
VIN
C3	(1×) 10 µF ±20% X5R, 10 V, 0402⁽¹⁾	GRM155R61A106ME21	Murata	1.0 mm × 0.5 mm × 0.5 mm
VGH, VGL1, VGL2
C2, C4, C5	(2×) 2.2 µF ±20% X5R, 35 V, 0402⁽¹⁾	GRM155R6YA225ME11	Murata	1.0 mm × 0.5 mm × 0.5 mm
PLLC (optional)
C6	(1×) 10 nF ±20% X5R, 10 V, 0402⁽¹⁾	GCM155R71E103KA37D	Murata	1.0 mm × 0.5 mm × 0.5 mm
OTP_LDO (optional)
C1	(1×) 2.2 µF ±20% X5R, 35 V, 0402⁽¹⁾	GRM155R6YA225ME11	Murata	1.0 mm × 0.5 mm × 0.5 mm

(1) Component used for characterization.

(2) See Third-party Products disclaimer.