TS4621B datasheet(9/48 Pages) STMICROELECTRONICS

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TS4621B

Typical application schematics

Doc ID 022194 Rev 2

9/48

Table 4.

TS4621B component description(1)

Component

Value

Description

2.2 µF

Decoupling capacitors for VCC. A 2.2 µF capacitor is sufficient for proper

decoupling of the TS4621B. An X5R dielectric and 10 V rating voltage is

recommended to minimize

ΔC/ΔV when VCC =4.8 V.

Must be placed as close as possible to the TS4621B to minimize parasitic

inductance and resistance.

C12

2.2 µF

Capacitor for internal negative power supply operation. An X5R dielectric

and 6.3 V rating voltage is recommended to minimize

ΔC/ΔV when

HPVDD = 1.9 V.

Must be placed as close as possible to the TS4621B to minimize parasitic

inductance and resistance.

CSS

2.2 µF

Filtering capacitor for internal negative power supply. An X5R dielectric and

6.3 V rating voltage is recommended to minimize

ΔC/ΔV when

HPVDD = 1.9 V.

Cin

Input coupling capacitor that forms with Rin

≈ Rindiff/2 a first-order high-

pass filter with a -3 dB cutoff frequency Fc. For example, at maximum gain

G=4dB, Rin =12.5k

Ω, Cin = 1 µF, therefore Fc = 13 Hz.

Cout

0.8 to 100 nF

Output capacitor of 0.8 nF minimum to 100 nF maximum. This capacitor is

mandatory for operation of the TS4621B.

Rout

Ω min.

Output resistor in-series with the TS4621B output. This 12

Ω minimum

resistor is mandatory for operation of the TS4621B.

3.3 µH

Inductor for internal DC/DC step-down converter.

References of inductors: refer to Section 4.4.1 for more information.

10 µF

Tank capacitor for internal DC/DC step-down converter. An X5R dielectric

and 6.3 V rating voltage is recommended to minimize

ΔC/ΔV when

HPVDD = 1.9 V. Refer to Section 4.4.2 for more information.

Refer to Section 4.4 for a complete description of each component.

Cin

π Rin Fc

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