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A22H165M Datasheet(PDF) 6 Page - STMicroelectronics |
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A22H165M Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 32 page  Typical application schematic A22H165M 6/32 DocID026035 Rev 1 Table 4. A22H165M component description Component Value Description Cs 2.2 µF Decoupling capacitors for VCC. A 2.2 µF capacitor is sufficient for proper decoupling of the A22H165M. 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 A22H165M 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 A22H165M 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 kΩ, 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 A22H165M. Rout 12 Ω min. Output resistor in-series with the A22H165M output. This 12 Ω minimum resistor is mandatory for operation of the A22H165M. L1 3.3 µH Inductor for the buck converter. 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) Ct 10 µF Tank capacitor for internal buck converter. 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 1 2 πZinFc ------------------------ = |
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