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參數(shù)資料
| 型號(hào)： | LTC1555L-1.8 |
| 廠(chǎng)商： | Linear Technology Corporation |
| 英文描述： | SIM Power Supply and Level Translator(SMI電源和電平轉(zhuǎn)換器) |
| 中文描述： | SIM卡電源和電平轉(zhuǎn)換（學(xué)校管理新措施電源和電平轉(zhuǎn)換器） |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大小： | 138K |
| 代理商： | LTC1555L-1.8 |
LTC1555L-1.8
5
BLOCK DIAGRA
APPLICATIU
W
U
U
The LTC1555L-1.8 performs the two primary functions
necessary for low voltage controllers (e.g., GSM cellular
telephone controllers, smart card readers, etc.) to com-
municate with 5V SIMs or smart cards. The part produces
a regulated 1.8V, 3V or 5V V
CC
supply for the SIM, and also
provides level translators for communication between the
SIM and the controller.
V
CC
Voltage Regulator
The regulator section of the LTC1555L-1.8 (refer to Block
Diagram) consists of a buck/boost charge pump DC/DC
converter. The charge pump can operate over a wide input
voltage range (2.6V to 6V) while maintaining a regulated
V
CC
output. The wide V
IN
range enables the part to be
powered directly from a battery (if desired) rather than
from a DC/DC converter output. When V
IN
is less than the
selected V
CC
voltage, the part operates as a switched
capacitor voltage doubler. When V
IN
is greater than V
CC
,
the part operates as gated switch step-down converter. In
either case, voltage conversion requires only one small
flying capacitor and output capacitor.
The V
CC
output can be programmed via the M0-M2 pins to
either 1.8V, 3V, 5V or direct connection to V
IN
. This
flexibility is useful in applications where multiple voltage
SIMs may be used. When the charge pump is put into
shutdown (M0, M1 = 0), V
CC
is pulled to GND via an
internal switch to aid in proper system supply sequencing.
An internal soft-start feature helps to limit inrush currents
upon start-up or when coming out of shutdown mode.
Inrush current limiting is especially useful when powering
the LTC1555L-1.8 from a DC/DC output since the unlim-
ited inrush current may approach 300mA and cause
voltage transients on the 3V supply. The part is fully short-
circuit and over temperature protected, and can survive an
indefinite short from V
CC
to GND.
DDRV
OPTIONAL
1
μ
A
I/O
DATA
20k
10k
CLK
CIN
RST
DV
CC
M2
1.8V
RIN
GND
M1
M0
V
IN
V
BATT
C
IN
1
μ
F
V
CC
I/O
CLK
RST
GND
V
CC
C1
+
0.1
μ
F
C1
–
STEP-UP/
STEP-DOWN
CHARGE PUMP
DC/DC
CONVERTER
SIM
CONTROLLER
V
CC
C
OUT
2.2
μ
F
UVLO
LTC1555L-1.8
1555L BD
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