LTC1472CS 데이터 시트보기 (PDF) - Linear Technology
부품명
상세내역
제조사
LTC1472CS Datasheet PDF : 16 Pages
| |||
U
OPERATION
VPP Gate Charge and Discharge Control
The VPP switches are designed to ramp slowly (typically
tens of µs) 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-
LTC1472
cally 100mA when protecting the 12V VPPIN supply and
60mA when protecting the VCC(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
VPPOUT
0V
VCC(IN)
VPPIN
Hi-Z
APPLICATIONS INFORMATION
The LTC1472 is a complete single slot VCC 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.
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 (10µA standby
current) at all other times to conserve power.
The XOR VCC input function allows the LTC1472 to inter-
face directly to the active-low VCC control outputs of the
CL-PD6710 for 3.3V/5V voltage selection (see the VCC
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.
5V +
100µF
10V
10µH
COILCRAFT
DO1608-103
MBRS130LT3
(12V)
6
2 VIN
SEL
7
SW 4
SENSE
LT1301
3
5
SHDN
ILIM
NC
PGND
GND
8
1
+
0.1µF
47µF
16V
TANT
3.3V
0.1µF
5V
0.1µF
CL-PD6710
VPP_PGM
VPP_VCC
VCC _3
VCC _5
0.1µF
10k
3VIN 3VIN SHDN
5VIN
VPPIN
VPPOUT
VCC(IN)
LTC1472
VDD
VPP EN0
VPP EN1
VCC EN0
VCC(OUT)
VCC(OUT)
VCC EN1
GND GND
0V, VCC,
12V, Hi-Z
0.1µF
+
10k
OFF,
3.3V, 5V
1µF
TANT
VPP1
VPP2
PCMCIA
CARD SLOT
VCC
VCC
LTC1472-F01
Figure 1. Direct Interface to Industry Standard PCMCIA
Controller and LT1301 Step-Up Switching Regulator
1472fa
9
Share Link: 