LX1668 데이터 시트보기 (PDF) - Microsemi Corporation
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LX1668 Datasheet PDF : 15 Pages
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PRODUCT DATABOOK 1996/1997
P ROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER
PR O D U C T I O N D ATA S H E E T
CHARACTERISTICS CURVES
LX1668
100
10 0
95
95
90
90
85
85
80
EFFICIENCY AT 3.1V
EFFICIENCY AT 2.8V
75
EFFICIENCY AT 1.8V
80
EFFICIE NCY A T 3.1V
EFFICIE NCY A T 2.8V
75
EFFICIE NCY A T 1.8V
70
1 2 3 4 5 6 7 8 9 10 11 12 13 14
IOUT (A)
FIGURE 1 — Efficiency Test Results:
Non-Synchronous Operation, V = 5V
IN
70
1 2 3 4 5 6 7 8 9 10 11 12 13 14
IOUT (A)
FIGURE 2 — Efficiency Test Results:
Synchronous Operation, V = 5V
IN
BLOCK DIAGRAM
+5V
2.5V
VOUT3
VCC3 5
2.5V
VCORE
15
VFB
16
60mV CS Comp
IRESET
PWM
RQ
VOUT2 4
LDRV 6
LFB 7
PWRGD 14
OVP 13
1.5V
Power Good
& OVP
VREF
8
9
VID[0:4] 10
11
12
DAC
VSET
40mV
Error Comp
RSS
20k
Hiccup
VRESET
SQ
Set
Hiccup
Off-Time
Control
UVLO
UVLO
17
SS/ENABLE
CSS
FIGURE 3 — Block Diagram
+12V VIN (5V)
2
VCC12
CIN
1
TDRV
19
BDRV
20
PGND
18
AGND
L
RSENSE
VCORE
ESR
COUT
+5V
3
VCC5
Copyright © 1999
Rev. 1.0 4/99
5
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