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LTC1314CS Datasheet

  • LTC1314CS

  • Linear Technology [PCMCIA Switching Matrix with Built-In N-...

  • 276.51KB

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LTC1314/LTC1315
APPLICATIONS INFORMATION
the asymmetrical turn-on and turn-off of the MOSFETs.
The LT1301 switching regulator is in shutdown mode and
consumes only 10碌A(chǔ) until the VPP pins require 12V.
The VPP switching is accomplished by a combination of
the LTC1314/LTC1315 and LT1301. The LT1301 is in
shutdown mode to conserve power until the VPP pins
require 12V. When the VPP pins require 12V, the LT1301
is activated and the LTC1314/LTC1315鈥檚 internal switches
route the VPP
IN
pin to the VPP
OUT
pin. The LT1301 is
capable of delivering 12V at 120mA maintaining high
efficiency. The LTC1314/LTC1315鈥檚 break-before-make
and slope-controlled switching will ensure that the output
voltage transition will be smooth, of moderate slope, and
without overshoot. This is critical for flash memory prod-
ucts to prevent damaging parts from overshoot and
ringing exceeding the 13.5V device limit.
With Higher Voltage Supplies Available
Often systems have an available supply voltage greater
than 12V. The LTC1314/LTC1315 can be used in conjunc-
tion with an LT1121 linear regulator to supply the PC card
socket with all necessary voltages. Figures 3 and 4 show
these circuits. The LTC1314/LTC1315 enable the LT1121
linear regulator only when 12V is required at the VPP pins.
In all other modes the LT1121 is in shutdown mode and
consumes only 16碌A(chǔ). The LT1121 also provides thermal
shutdown and current limiting features to protect the
socket, the card and the system regulator.
Supply Bypassing
For best results, bypass V
CCIN
and VPP
IN
at their inputs
with 1碌F capacitors. VPP
OUT
should have a 0.01碌F to 0.1碌F
capacitor for noise reduction and electrostatic discharge
(ESD) damage prevention. Larger values of output capaci-
tor will create large current spikes during transitions,
requiring larger bypass capacitors on the V
CCIN
and VPP
IN
pins.
13V TO 20V
(MAY BE FROM
AUXILLARY
WINDING)
+
10碌F
5V
100k
V
IN
LT1121
SHDN
PGND
5V
2N7002
V
DD
SHDN
VPP
IN
VPP
OUT
LTC1314
DRV5
V
CCIN
DRV3
GND
Q2B
Q2A
Si9956DY
VPP1
VPP2
PC CARD
SOCKET
EN0
PCMCIA
CONTROLLER
EN1
V
CC0
V
CC1
Q1A
1/2 Si9956DY
Figure 3. LTC1314 with the LT1121 Linear Regulator
8
U
W
U
U
V
OUT
200pF
ADJ
GND
121k
1%
56.2k
1%
+
1碌F
5V
0.1碌F
+
1碌F
V
CC
1314/15 F03
3.3V

LTC1314CS 產(chǎn)品屬性

  • LTC1314/15

  • 55

  • 集成電路 (IC)

  • PMIC - 電源分配開(kāi)關(guān)

  • -

  • PCMCIA/Cardbus 開(kāi)關(guān)

  • 1

  • 1.2 歐姆

  • 是

  • 120mA

  • 3 V ~ 5.5 V

  • 0°C ~ 70°C

  • 表面貼裝

  • 14-SOIC（0.154"，3.90mm 寬）

  • 14-SOIC

  • 管件

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