Altera Stratix - Page 559

Altera Corporation 14–11
January 2005 Stratix Device Handbook, Volume 2
Designing with 1.5-V Devices
Figures 14–7 through 14–12 show the circuit diagrams of Linear
Technology voltage regulators listed in Table 14–5.
The LT1573 linear voltage regulator converts 2.5-V to 1.5-V with an
output current of 6A (see Figure 14–7).
Figure 14–7. LT1573: 2.5-V-to-1.5-V/6.0-A Linear Voltage Regulator
Notes to Figure 14–7:
(1) C
IN1
and C
OUT
are AVX 100-μF/10-V surface-mount tantalum capacitors.
(2) Use SHDN (active high) to shut down the regulator.
(3) C
TIME
is a 0.5-μF capacitor for 100-ms time out at room temperature.
(4) C
IN2
is an AVX 15-μF/10-V surface-mount tantalum capacitor.
Use adjustable 5.0- to 1.5-V regulators (shown in Figures 14–8 through
14–10) for 3.0- to 7.5-A low-cost, low-device-count, board-space-efficient
solutions.
LT1573
FB
LATCH
SHDN (2)
GND
COMP
V
OUT
V
IN
DRIVE
LOAD
V
OUT
R2 1k
1/8 W
R1
186 Ω
1/8 W
C
TIME
0.5 μF
C
OUT
C
IN1
Motorola
D45H11
+
+
V
3.3 V
IN2
V
2.5 V
1.5 V
IN1
C
IN2
+
R
6 Ω
1/2 W
D
R
200Ω
1/8 W
B
+
(1)
(4)
(3)
(1)