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參數(shù)資料
| 型號： | LT1470 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Single and Dual PCMCIA Protected 3.3V/5V VCC Switches |
| 中文描述： | 單路和雙路的PCMCIA保護3.3V/5V的虛擬通道連接開關(guān) |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 229K |
| 代理商： | LT1470 |
8
LTC1470/LTC1471
APPLICATIO
S I
N
FOR
ATIO
U
TOTAL SYSTEM COST CONSIDERATIONS
The cost of an additional step-up switching regulator, induc-
tor, rectifier and capacitors to produce 12V for VPP can be
eliminated by using an auxiliary winding on either the 3.3V
or 5V output of the system switching regulator to produce an
auxiliary 15V supply for VPP power.
And, because the LTC1470/LTC1471 do not require 12V
power to operate (only 5V), the 12V VPP regulation and
switching may be operated separately from the 3.3V/5V V
CC
switching. This increases system configuration flexibility
and reduces total system costby eliminating the need for a
third regulator for 12V power.
W
U
LTC1142HV Auxiliary Winding Power Supply
Figure 3 is a schematic diagram which describes how a
loosely regulated 15V power supply is created by adding an
auxiliary winding to the 5V inductor in a split 3.3V/5V
LTC1142HV power supply system. An LT1313, dual VPP
regulator/driver with SafeSlot protection, produces “clean”
3.3V, 5V and 12V power from this loosely regulated 15V
output for the PC card slot VPP pins. (See LT1312 and
LT1313 data sheets for further detail.)
A turns ratio of 1:1.8 is used for transformer T1 to ensure that
the input voltage to the LT1313 falls between 13V and 20V
under all load conditions. The 9V output from this additional
Figure 3. Cost Effective Complete SafeSlot Dual PCMCIA Power Management System
(with 15V Auxiliary Supply from LTC1142HV 5V Regulator Inductor)
+
10
9
20
15
14
BVPPEN0
Q4
2N7002
R3
18k
C2
1000pF
C1
68
μ
F
C3
220
μ
F
C5
22
μ
F
1
μ
F
0.1
μ
F
10k
0.1
μ
F
1
μ
F
1
μ
F
TANT
1
μ
F
TANT
V
S
A3V
IN
A3V
IN
A5V
IN
LTC1471
B3V
IN
B3V
IN
(15V)
V
S
5V
OUTPUT
3.3V
5V
T1*
30
μ
H
* LPE-6562-A026 DALE (605) 665-9301
R5
0.033
Q1
Q2
R1
100
R4
22
C4
1000pF
D2
MBRS140
D3
MBRS130T3
D1
MBRS140
1.8:1
V
IN
6.5V TO 18V
Q3
2N7002
AVPPEN0
R2
100
+
+
+
AVPPEN0
AVPPEN1
AVALID
AEN0
AEN1
AVALID
BVPPEN0
BVPPEN1
BVALID
AV
CC
EN0
AV
CC
EN1
BV
CC
EN0
BV
CC
EN1
AEN0
AEN1
BEN0
BEN1
AOUT
AOUT
BOUT
BOUT
B5V
IN
BEN0
BEN1
BVALID
ASENSE
BVPP
OUT
AVPP
OUT
BSENSE
GND
FROM “A” V
CC
PINS
TO “B” SLOT
VPP PINS
FROM “B” V
CC
PINS
TO “A” SLOT
VPP PINS
TO “A” SLOT
V
CC
PINS
LT1313
GND
1470/71 F03
GND
GND
+
TO “B” SLOT
V
CC
PINS
+
+
10k
V
IN
PDRIVE
NDRIVE
SENSE
+
SENSE
–
1/2 LTC1142HV
(5V REG)
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