MAX97236 Datasheet, PDF (36/39 Pages) Maxim Integrated Products – Audio Amplifier with Jack Detection 25-Bump, 2.4mm x 2.3mm, 0.4mm Pitch WLP

Audio Amplifier with Jack Detection
Component Selection and Layout
Charge-Pump Capacitors
The charge pump requires three capacitors: PVDD,
PVSS, and the flying capacitor between C1N and C1P.
It is recommended that these all remain the same value.
Capacitance values of 1FF are recommended. Larger
value capacitors can be used to lower power-supply
ripple. Do not use charge-pump caps greater than
3.3FF. See Table 19 for a detailed description for each
component value.
Table 19. Recommended Component Values
COMPONENT
Charge-pump capacitors
RECOMMENDED VALUE
1FF, X5R,
6.3V or greater voltage rating
or better
DETAILS
The capacitor needs low ESR to achieve the required charge-
pump output impedance. If the charge-pump output imped-
ance is too high, the headphone amplifier cannot deliver the
stated output power.
A larger capacitor does not completely charge in one switch-
ing cycle. A smaller capacitor does not hold enough charge.
Thus, it is highly recommended to use the suggested value.
V_DD capacitor
C1: 1FF to 10FF, X5R, 6.3V
or better
C2: 0.01nF to 0.1FF, X5R,
6.3V minimum
C1: A smaller values helps on the ESD robustness.
C2: Is not a must-have capacitor, but still recommended. This
capacitor helps improve the RF immunity of the IC.
Audio input capacitors
1FF, 6.3V, X5R or better
Microphone input capacitors
EMI filter capacitors
EMI filter ferrite bead
1FF, 6.3V, X5R or better
33pF
Murata BLM15BB220
Lower capacitance creates a highpass filter due to the input
impedance of the IC.
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PROCESS: BiCMOS
Chip Information
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