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Applications Information
11-8
M68060 USER’S MANUAL
MOTOROLA
devices that are needed externally in addition to the Linear Technologies devices. The con-
version efficiency is 89% and 93% for the LTC1147 and LTC1148, respectively. Figure 11-
2 and Figure 11-3 show the solutions provided by using the switching regulators. The
MAX767 provides over 90% conversion efficiency at less than $4 in 1000 piece quantities.
The MAX767 solution also requires discreet components off-chip. The MAX767 uses a
smaller inductor than the LTC1148 solution. Figure 11-4 shows a MAXIM voltage regulator
solutions. All the suggested solutions meets 3.3 V
±
5% MC68060 specifications.
Figure 11-2. LTC1147 Voltage Regulator Solution
P-DRIVE
SENSE +
SENSE –
GND
VIN
SHUTDOWN
C
T
I
TH
LTC1147-3.3
T1
D1
R1
C1
C4
CT
CC
RC
C2 C3
CL
L1
3.3 V
2 A
5 V
D2
D3
D4
T1 = Si9430DY
L1 = 50
µ
H Coiltronics CTX50-2-MP
D1 = MBRD330
D2,D3,D4 = IN4001
R1 = 0.05
IRC LR2512-01-R050-G
RC = 1K
C1 = 1000 pF
C2 = 100
µ
F, 20V
C3 = 1
µ
F
C4 = 100 nF
CC = 3300 pF
CT = 470 pF
CL = 220
µ
F, 10V x2
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