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| 型号： | LTC660CS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG DBL INV ADJ 0.1A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 倍增器，反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | -1.5 V ~ -5.5 V，5 V ~ 11 V |
| 输入电压： | 1.5 V ~ 5.5 V，2.5 V ~ 5.5 V |
| 频率 - 开关： | 10kHz，80kHz |
| 电流 - 输出： | 100mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°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 |
LTC660
TYPICAL APPLICATIO N S N
Negative Voltage Converter
Figure 7 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. The LV pin
(Pin 6) is shown grounded, but for V + ≥ 3V, it may be
floated, since LV is internally switched to ground (Pin 3)
for V + ≥ 3V.
Voltage Doubling
Figure 8 shows the LTC660 operating in the voltage
doubling mode. The external Schottky (1N5817) diode is
for start-up only. The output voltage is 2 ? V IN without a
load. The diode has no effect on the output voltage.
1N5817*
CAP
OSC
+
C1
150 μ F
1
2
3
4
CAP + OSC
LTC660
GND LV
CAP – V OUT
BOOST V +
8
7
6
5
V IN
1.5V TO 5.5V
V OUT = –V IN
V IN
2.5V
TO 5.5V
C1
150 μ F
+
1
2
3
4
+
LTC660
GND LV
CAP – V OUT
BOOST V +
8
7
6
5
+
V OUT = 2V IN
C2
150 μ F
C2
150 μ F
LTC660 ? F07
* SCHOTTKY DIODE IS FOR START-UP ONLY
Figure 8. Voltage Doubler
LTC660 ? F08
Figure 7. Voltage Inverter
Ultraprecision Voltage Divider
The output voltage (Pin 5) characteristics of the circuit are
those of a nearly ideal voltage source in series with a 6.5 ?
resistor. The 6.5 ? 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-
An ultraprecision voltage divider is shown in Figure 9. To
achieve the 0.002% accuracy indicated, the load current
should be kept below 100nA. However, with a slight loss
in accuracy, the load current can be increased.
resistance of the MOS switches.
1
8
V +
At an oscillator frequency of 10kHz and C1 = 150 μ F, the
first term is:
+
C1
150 μ F
2
3
4
LTC660
7
6
5
3V TO 11V
( f )
± 0.002%
T MIN ≤ T A ≤ T MAX
I L ≤ 100nA
1
R EQUIV =
OSC /2 C1
1
5 ? 10 3 ? 150 ? 10 – 6
=
= 1 . 3 ?.
V +
2
+
C2
150 μ F
Figure 9. Ultraprecision Voltage Divider
LTC660 ? F09
Notice that the equation for R EQUIV is not a capacitive
reactance equation (X C = 1/ ω C) and does not contain a
2 π term.
The exact expression for output impedance is complex,
but the dominant effect of the capacitor is clearly shown on
the typical curves of output impedance and power effi-
ciency versus frequency. For C1 = C2 = 150 μ F, the output
impedance goes from 6.5 ? at f OSC = 10kHz to 110 ? at
f OSC = 100Hz. As the 1/fC term becomes large compared
to the switch on-resistance term, the output resistance is
determined by 1/fC only.
8
Battery Splitter
A common need in many systems is to obtain positive and
negative supplies from a single battery or single power
supply system. Where current requirements are small, the
circuit shown in Figure 10 is a simple solution. It provides
symmetrical positive or negative output voltages, both
equal to one-half the input voltage. The output voltages are
both referenced to Pin 3 (Output Common).
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