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參數(shù)資料
| 型號(hào)： | LTC1472 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual General Purpose LinCMOS(TM) Differential Comparator 8-PDIP -40 to 85 |
| 中文描述： | 受保護(hù)的PCMCIA虛擬通道連接和VPP開關(guān)矩陣 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大?。?/td> | 300K |
| 代理商： | LTC1472 |
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9
LTC1472
VPP Gate Charge and Discharge Control
The VPP switches are designed to ramp slowly (typically
tens of
μ
s) between output modes to reduce supply
glitching when powering large capacitive loads.
VPP Switch Protection
Both VPP power switches are protected against accidental
short circuits with SafeSlot fold-back current limit circuits
which limit the short-circuit (0V) output current to typi-
OPERATIO
U
APPLICATIO
S I
N
FOR
ATIO
U
The LTC1472 is a complete single slot V
CC
and VPP power
supply switch matrix with SafeSlot current limit protection
on both outputs. It is designed to interface directly with
industry standard PCMCIA card controllers and to indus-
try standard 12V regulators.
W
U
cally 100mA when protecting the 12V VPP
IN
supply and
60mA when protecting the V
CC(IN)
supply. (Higher operat-
ing currents are allowed at higher output voltages). Both
switches also have thermal shutdown.
VPP Switch Truth Table
VPP EN0
0
0
1
1
VPP EN1
0
1
0
1
VPP
OUT
0V
V
CC(IN)
VPP
IN
Hi-Z
Interfacing to the CL-PD6710 and the LT
1301
Figure 1 shows the LTC1472 interfaced to a standard
PCMCIA slot controller and an LT1301 step-up switching
regulator. The LTC1472 accepts logic control directly
from the CL-PD6710 and in turn, controls the LT1301 to
provide clean 12V VPP programming power when re-
quired. The LT1301 is then shutdown (10
μ
A standby
current) at all other times to conserve power.
The XOR V
CC
input function allows the LTC1472 to inter-
face directly to the active-low V
CC
control outputs of the
CL-PD6710 for 3.3V/5V voltage selection (see the V
CC
Switch Truth Table). Therefore, no “glue” logic is required
to interface to this PCMCIA compatible controller.
The LTC1472 provides SafeSlot current-limit protection
for the LT1301 step-up regulator, the system 3.3V and 5V
regulators, the socket and the card. Further, depending
upon the system regulator’s own current limits, it may
allow the system power supplies to continue operation
during a card/slot short circuit without losing data, etc.
3V
IN
5V
IN
3V
IN
SHDN
V
DD
VPP EN0
VPP EN1
V
CC
EN0
V
CC
EN1
GND
VPP
IN
VPP
OUT
V
CC(IN)
V
CC(OUT)
V
CC(OUT)
GND
LTC1472
V
IN
SEL
SHDN
PGND
SW
SENSE
I
LIM
GND
LT1301
3.3V
0.1
μ
F
5V
100
μ
F
10V
5V
0.1
μ
F
CL-PD6710
VPP_V
CC
V
CC
_3
VPP_PGM
V
CC
_5
PCMCIA
CARD SLOT
VPP1
VPP2
V
CC
V
CC
0.1
μ
F
10k
1
μ
F
TANT
OFF,
3.3V, 5V
0.1
μ
F
0.1
μ
F
47
μ
F
16V
TANT
(12V)
10
μ
H
COILCRAFT
DO1608-103
3
2
10k
+
+
+
6
7
4
5
NC
MBRS130LT3
0V, V
,
12V, Hi-Z
1
8
LTC1472-F01
Figure 1. Direct Interface to Industry Standard PCMCIA
Controller and LT1301 Step-Up Switching Regulator
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