TS4621E datasheet(6/32 Pages) STMICROELECTRONICS

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Typical application schematics

TS4621E

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Doc ID 022201 Rev 1

Table 4.

TS4621E component description

Component

Value

Description

2.2 µF

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

decoupling of the TS4621E. 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 TS4621E 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 TS4621E 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 Zin/2 a first-order high-pass filter with

a -3 dB cutoff frequency FC. For example, at maximum gain G = 4 dB,

Zin = 12.5 k

Ω, Cin = 2.2 µF, therefore FC = 6 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 TS4621E.

Rout

Ω min.

Output resistor in-series with the TS4621E output. This 12

Ω minimum resistor

is mandatory for operation of the TS4621E.

3.3 µH

Inductor for the buck convertor.

References of inductors:

FDK: MIPSZ2012D3R3 (DC resistance = 0.19

Ω, rated current = 0.8 A)

Murata: LQM2MPN3R3G0 (DC resistance = 0.12

Ω, rated current = 1.2 A)

10 µF

Tank capacitor for internal buck convertor. An X5R dielectric and 6.3 V rating

voltage is recommended to minimize

ΔC/ΔV when HPVDD = 1.9 V.

ESR of the Ct capacitor must be as low as possible to obtain the best buck

efficiency.

Cin

πZinFc

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