GL3523 datasheet(40/47 Pages) ETC

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GL3523 Datasheet

Page 40

GLI Confidential

6.5 On-Chip Power Regulator

GL3523 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 GL3523; 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 0.8A (5-1.2V), which provide enough tolerance for

normal GL3523 operation (below 100mA).

6.5.1 5V to 3.3V Regulator

5V to 3.3V On-chip Power Regulator features are described as follows.



5V to 3.3V low-drop power regulator



250mA maximum output driving capability



Provide stable 3.3V output when Vin = 4.5V~5.5V



125uA maximum quiescent current (typical 80uA).

*Note: Measured environment: Ambient temperature = 25℃,

Current Loading = 250mA

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

3.245

3.25

3.255

3.26

3.265

3.27

3.275

3.28

3.285

4.5

4.7

4.9

5.1

5.3

5.5

Vin (V)

Vin (V5) vs Vout (V33)*

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