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LTC1471 Datasheet(PDF) 8 Page - Linear Technology

Part # LTC1471
Description  Single and Dual PCMCIA Protected 3.3V/5V VCC Switches
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1471 Datasheet(HTML) 8 Page - Linear Technology

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8
LTC1470/LTC1471
14701fa
APPLICATIONS INFORMATION
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 VCC
switching. This increases system configuration flexibility
and
reduces total system cost by eliminating the need for a
third regulator for 12V power.
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
µF
C3
220
µF
C5
22
µF
1
µF
0.1
µF
10k
0.1
µF
1
µF
1
µF
TANT
1
µF
TANT
VS
A3VIN A3VIN
LTC1471
B3VIN B3VIN
(15V)
VS
5V
OUTPUT
3.3V
5V
T1*
30
µH
* 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
VIN
6.5V TO 18V
Q3
2N7002
AVPPEN0
R2
100
+
+
+
AVPPEN0
AVPPEN1
AVALID
AEN0
AEN1
AVALID
BVPPEN0
BVPPEN1
BVALID
AVCCEN0
AVCCEN1
BVCCEN0
BVCCEN1
AEN0
AEN1
BEN0
BEN1
AOUT
AOUT
BOUT
BOUT
A5VIN
B5VIN
BEN0
BEN1
BVALID
ASENSE
BVPPOUT
AVPPOUT
BSENSE
FROM “A” VCC PINS
FROM “B” VCC PINS
TO “A” SLOT
VPP PINS
TO “A” SLOT
VCC PINS
TO “B” SLOT
VPP PINS
LT1313
GND
GND
1470/71 F03
GND
GND
+
TO “B” SLOT
VCC PINS
+
+
10k
VIN
PDRIVE
NDRIVE
SENSE+
SENSE
1/2 LTC1142HV
(5V REG)


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