GL3522-22 Datasheet

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Page 28

GLI Confidential

6.5 On-Chip Power Regulator

GL3522-22 requires 3.3V and 1.2V source power for normal operation of internal core logic and USB

physical layer (PHY). There are two kinds of regulators integrated in GL3522-22; one is low-drop power

regulator converts 5V power input from USB cable (Vbus) to 3.3V voltage for silicon power source; another

one is DC-DC switching regulator converts 5V to 1.2 V. The 3.3V and 1.2V power output are guaranteed by

internal voltage reference circuits to prevent unstable 5V power compromise USB data integrity. The

regulators’ maximum currents loading are 250mA (5-3.3V) and 1A (5-1.2V), which provide enough tolerance

for normal GL3522-22 operation (below 100mA).

On-chip Power Regulator Features:



5V to 3.3V low-drop power regulator



250mA maximum output driving capability



Provide stable 3.3V output when Vin = 3.4V~5.5V



125uA maximum quiescent current (typical 80uA).

Figure 6.1 - Vin(V5) vs Vout(V33)*

*Note: Measured environment: Ambient temperature = 25℃ / Current Loading = 250mA