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参数资料
| 型号： | LTC1144IS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP INV 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 切换式电容器（充电泵），反相 |
| 输出数： | 1 |
| 输入电压： | 2 V ~ 18 V |
| 频率 - 开关： | 4kHz ~ 10kHz |
| 电流 - 输出： | 50mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LTC1144
TYPICAL A PPLICATI
Negative Voltage Converter
S
V IN
2V TO 18V
Figure 8 shows a typical connection which will provide a
negative supply from an available positive supply. This
circuit operates over full temperature and power supply
ranges without the need of any external diodes.
1
2
3
4
LTC1144
8
7
6
5
V d +
1N4148
+
V d
1N4148
+
10 μ F
+
V OUT = 2(V IN – 1)
10 μ F
The output voltage (pin 5) characteristics of the circuit are
those of a nearly ideal voltage source in series with a 56 ?
resistor. The 56 ? output impedance is composed of two
terms: 1) the equivalent switched capacitor resistance
(see Theory of Operation), and 2) a term related to the on-
resistance of the MOS switches.
1144 F09
Figure 9. Voltage Doubler
Ultra-Precision Voltage Divider
An ultra-precision voltage divider is shown in Figure 10. To
achieve the 0.0002% accuracy indicated, the load current
1
2
V +
2V TO 18V
8
7
should be kept below 100nA. However, with a slight loss
in accuracy, the load current can be increased.
V +
10 μ F
+
3
4
LTC1144
6
5
V OUT = –V +
1
2
4V TO 36V
8
7
T MIN ≤ T A ≤ T MAX
+ LTC1144
+
T MIN ≤ T A ≤ T MAX
I L ≤ 100nA
R EQUIV =
=
= 20 ?
( f
) × C 1
10 μ F
1144 F08
Figure 8. Negative Voltage Converter
At an oscillator frequency of 10kHz and C1 = 10 μ F, the first
term is:
1 1
OSC / 2 5 × 10 3 × 10 × 10 ? 6
Notice that the above equation for R EQUIV is not a capaci-
tive reactance equation (X C = 1/ ω C) and does not contain
a 2 π term.
The exact expression for output impedance is extremely
complex, but the dominant effect of the capacitor is clearly
C1 3 6
10 μ F
4 5
V+ ±0.002%
2
C2
10 μ F
1144 F10
Figure 10. Ultra-Precision Voltage Divider
Battery Splitter
A common need in many systems is to obtain (+) and (–)
supplies from a single battery or single power supply
system. Where current requirements are small, the circuit
shown in Figure 11 is a simple solution. It provides
symmetrical ± output voltages, both equal to one half the
input voltage. The output voltages are both referenced to
pin 3 (output common).
shown in Figure 5. For C1 = C2 = 10 μ F, the output
impedance goes from 56 ? at f OSC = 10kHz to 250 ? at
f OSC = 1kHz. As the 1/(f × C) term becomes large compared
to the switch on-resistance term, the output resistance is
determined by 1/(f × C) only.
V B
18V
+
C1
10 μ F
+
1
2
3
4
LTC1144
8
7
6
5
V B /2
9V
–V B /2
–9V
Voltage Doubling
Figure 9 shows a two-diode capacitive voltage doubler.
With a 15V input, the output is 29.45V with no load and
28.18V with a 10mA load.
C2
10 μ F
Figure 11. Battery Splitter
OUTPUT
COMMON
1144 F11
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.
7
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