AFS090 datasheet(56/334 Pages) MICROSEMI

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Device Architecture

2- 40

R e visio n 2

1.5 V Voltage Regulator

The 1.5 V voltage regulator uses an external pass transistor to generate 1.5 V from a 3.3 V supply. The

base of the pass transistor is tied to PTBASE, the collector is tied to 3.3 V, and an emitter is tied to

PTBASE and the 1.5 V supplies of the Fusion device. Figure 2-27 on page 2-33 shows the hook-up of

the 1.5 V voltage regulator to an external pass transistor.

Microsemi recommends using a PN2222A or 2N2222A transistor. The gain of such a transistor is

approximately 25, with a maximum base current of 20 mA. The maximum current that can be supported

is 0.5 A. Transistors with different gain can also be used for different current requirements.

Table 2-18 • Electrical Characteristics

VCC33A = 3.3 V

Symbol

Parameter

Condition

Min

Typical

Max

Units

VOUT

Output Voltage

Tj = 25ºC

1.425

1.5

1.575

ICC33A

Operation Current

Tj = 25ºC

ILOAD = 1 mA

ILOAD = 100 mA

ILOAD = 0.5 A

ΔVOUT

Load Regulation

Tj = 25ºC

ILOAD = 1 mA to 0.5 A

ΔVOUT

Line Regulation

Tj = 25ºC

VCC33A = 2.97 V to 3.63 V

ILOAD = 1 mA

VCC33A = 2.97 V to 3.63 V

ILOAD = 100 mA

VCC33A = 2.97 V to 3.63 V

ILOAD = 500 mA

10.6

12.1

10.6

mV/V

Dropout Voltage*

Tj = 25ºC

ILOAD = 1 mA

ILOAD = 100 mA

ILOAD = 0.5 A

0.63

0.84

1.35

IPTBAS

PTBase Current

Tj = 25ºC

ILOAD = 1 mA

ILOAD = 100 mA

ILOAD = 0.5 A

736

µA

Note:

*Data collected with 2N2222A.

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