M1AFS600-PQ208 Datasheet, PDF (56/334 Pages) Microsemi Corporation – Fusion Family of Mixed Signal FPGAs

Device Architecture
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
V
ICC33A Operation Current
Tj = 25ºC
ILOAD = 1 mA
ILOAD = 100 mA
ILOAD = 0.5 A
11
mA
11
mA
30
mA
VOUT Load Regulation Tj = 25ºC ILOAD = 1 mA to 0.5 A
90
mV
VOUT Line Regulation Tj = 25ºC VCC33A = 2.97 V to 3.63 V
ILOAD = 1 mA
10.6
VCC33A = 2.97 V to 3.63 V
ILOAD = 100 mA
12.1
VCC33A = 2.97 V to 3.63 V
ILOAD = 500 mA
10.6
mV/V
mV/V
mV/V
Dropout Voltage*
Tj = 25ºC
ILOAD = 1 mA
ILOAD = 100 mA
ILOAD = 0.5 A
0.63
V
0.84
V
1.35
V
IPTBAS PTBase Current
E
Tj = 25ºC
ILOAD = 1 mA
ILOAD = 100 mA
ILOAD = 0.5 A
48
µA
736
µA
12
20
mA
Note: *Data collected with 2N2222A.
2-40
Revision 4