mc68ec060 Freescale Semiconductor, Inc, mc68ec060 Datasheet - Page 329

• Manufacturer Part Number: mc68ec060
• Description: Mc68060 Superscalar 68k Microprocessor Including The Lc060 And Ec060
• Manufacturer: Freescale Semiconductor, Inc

11.2.1.1.1 Linear Voltage Regulator Solution. This solution uses a linear voltage regula-
tor to supply 2 A at 3.3 V. This solution is inexpensive; however, conversion efficiency of only
up to 65% can be achieved. Figure 11-1 shows a solution using power BJTs. This solution
would be used primarily for applications that are cost sensitive, but not power sensitive. The
suggested linear solution meets the 3.3 V 5% MC68060 specifications.
11.2.1.1.2 Switching Regulator Solution. This solution uses switching regulators. Linear
Technologies offers two parts, the LTC1147 and LTC1148 and MAXIM offers the MAX767.
The main difference among these parts is a trade-off between price, part count, and conver-
sion efficiency.
The LTC1147 solution is less expensive and has one fewer MOSFET than the LTC1148
solution. The LTC1148 is less than $5 in 1000 piece quantities, and the LTC1147 is less
than $4 in 1000 piece quantities. In either of these solutions there are around 15 discrete
MOTOROLA
D2,D3,D4 = IN4001
R2,R3,R4 = 1K
5 V
D1
R1
R5
C1
C2
C3
CL
T1
T2
C1
D1
R1
= TIP32
= 2N2222A
= TL431CLP
= 220
= 2.2K
= 47 F
= 0.01 F
= 0.033 F
= 47 F
Figure 11-1. Linear Voltage Regulator Solution
C2
M68060 USER’S MANUAL
T1
D2
D3
T2
D4
C3
R4
CL
Applications Information
R2
R3
R5
3.3 V
2 A
11-7