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參數(shù)資料
| 型號： | LT1332CSW#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232 W/12V VPP 24-SOIC |
| 標準包裝： | 32 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 3/5 |
| 規(guī)程： | RS232 |
| 電源電壓： | 2 V ~ 6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 24-SOIC |
| 包裝： | 管件 |
LT1332
7
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
APPLICATIONS INFORMATION
Operation with a Switching Regulator
The LT1332 is designed to be powered from an external
switchingregulatorwhichmaybeusedelsewhereforpower
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 operation of
the charge pump resembles the switching characteristics
of the LT1237 and similar devices.
TheV–supplyisnotdirectlyregulated.Thecircuitrelieson
cross regulation and the regulator’s minimum duty cycle
to control V–. Select the C– and V– storage capacitors 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 0.1F ceramic decoupling capacitors are
needed on the positive supply inputs, low ESR tantalum
Figure 1. Multiple LT1332s Powered from a Single LT1172 DC/DC Converter
capacitors should be used in the charge pump to reduce
voltage losses. The C– capacitor should be at least 1F
and the V– capacitor should be 5 to 10 times bigger. As
a rule of thumb, make the V– capacitor at least 1/DCMIN
times bigger than the C– capacitor where DCMIN is the
regulator’s minimum duty cycle. Using large values for
the V– capacitor 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 converter
using an LT1172. Even with all twelve drivers heavily
loaded (RL = 3k, CL = 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
+
ON/OFF
GND
V–
LT1332
C–
V+
3V VCC GND
0.1
F10F
+
ON/OFF
GND
V–
LT1332
C–
V+
3V VCC GND
0.1
F10F
0.1
F
3V VCC
INPUT
ON/OFF
+
1
F
+
1
F
22
F
8V
1N5817
L1*
100
H
135k**
FB
VSW
LT1172
VN2222LL
VIN
GND
VC
25k**
68
F
VIN
0.1
F
1k
OPTIONAL
SHUTDOWN
2.7V < VIN < 5.5V
I(VIN) < 14mA (UNLOADED)
L1 = SUMIDA CD105-101K OR COILCRAFT DO3316-104
1% METAL FILM
*
**
LT1332 F01
+
0.1
F10F
ON/OFF
GND
V–
LT1332
C–
V+
3V VCC GND
+
0.1
F10F
ON/OFF
GND
V–
LT1332
C–
V+
3V VCC GND
0.1
F
+
1
F
+
1
F
0.1
F
0.1
F
+
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