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參數(shù)資料
| 型號(hào)： | LT1332CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs 20-SOIC 0 to 70 |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDSO24 |
| 封裝： | PLASTIC, SOL-24 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 264K |
| 代理商： | LT1332CS |
7
LT1332
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
APPLICATIU
Operation with a Switching Regulator
The LT1332 is designed to be powered from an external
switching regulator which may be used elsewhere for
power conditioning. In a typical application, the LT1332
shares the regulator’s positive output, while charge is
capacitively pumped from the regulator’s switch pin to the
negative supply. Schottky rectifiers built into the LT1332
simplify the charge pump design. When used with a
micropower switcher like the LT1109A, the Burst Mode
TM
operation of the charge pump resembles the switching
characteristics of the LT1237 and similar devices.
The V
–
supply is not directly regulated. The circuit relies
on cross regulation and the regulator’s minimum duty
cycle to control V
–
. Select the C
–
and V
–
storage capaci-
tors so that when the regulator operates at minimum duty
cycle, sufficient charge will transfer to the V
–
storage cap
to maintain a voltage of at least –6.5V.
While only 0.1
μ
F ceramic decoupling capacitors are needed
on the positive supply inputs, low ESR tantalum capaci-
U
W
U
Figure 1. Multiple LT1332s Powered from a Single LT1172 DC/DC Converter
tors should be used in the charge pump to reduce voltage
losses. The C
–
capacitor should be at least 1
μ
F and the V
–
capacitor should be 5 to 10 times bigger. As a rule of
thumb, make the V
–
capacitor at least 1/DC
MIN
times
bigger than the C
–
capacitor where DC
MIN
is the regulator’s
minimum duty cycle. Using large values for the V
–
capaci-
tor reduces ripple on the V
–
supply.
Multiple Transceivers
The circuit in Figure 1 demonstrates how the LT1332 may
be used with different types of switching regulators. Four
LT1332s are powered from a single PWM DC/DC con-
verter using an LT1172. Even with all twelve drivers
heavily loaded (R
L
= 3k, C
L
= 2500pF), the circuit generates
fully compliant RS232 signals at 120k baud.
Operations with External Supplies
When external RS232 supplies are available (6.5V
≤
V
+
≤
13.2V, –13.2V
≤
V
–
≤
–6.2V) the LT1332 can be used
as a stand-alone unit. Capacitor selection is consider-
+
ON/OFF
GND
V
–
LT1332
C
–
V
+
3V V
CC
GND
0.1
μ
F
10
μ
F
+
ON/OFF
GND
V
–
LT1332
C
–
V
+
3V V
CC
GND
0.1
μ
F
10
μ
F
0.1
μ
F
3V V
CC
INPUT
ON/OFF
+
1
μ
F
+
1
μ
F
22
μ
F
8V
1N5817
L1*
100
μ
H
135k**
FB
V
C
V
SW
LT1172
VN2222LL
V
IN
GND
25k**
68
μ
F
V
IN
0.1
μ
F
1k
OPTIONAL
SHUTDOWN
2.7V < V
< 5.5V
I(V
IN
) < 14mA (UNLOADED)
L1 = SUMIDA CD105-101K OR COILCRAFT DO3316-104
1% METAL FILM
*
**
LT1332 F01
+
0.1
μ
F
10
μ
F
ON/OFF
GND
V
–
LT1332
C
–
V
+
3V V
CC
GND
+
0.1
μ
F
10
μ
F
ON/OFF
GND
V
–
LT1332
C
–
V
+
3V V
CC
GND
0.1
μ
F
+
1
μ
F
+
1
μ
F
0.1
μ
F
0.1
μ
F
+
+
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