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参数资料
| 型号： | LTC1046IS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHD CAP DIV INV 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 切换式电容器（充电泵），分配器，反相 |
| 输出数： | 1 |
| 输入电压： | 1.5 V ~ 6 V |
| 频率 - 开关： | 5.5kHz ~ 30kHz |
| 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 |
LTC1046
TYPICAL A PPLICATI
S
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 GND (Pin 3) for
V + ≥ 3V.
The output voltage (Pin 5) characteristics of the circuit are
those of a nearly ideal voltage source in series with an 27 ?
resistor. The 27 ? output impedance is composed of two
terms: 1) the equivalent switched capacitor resistance
the typical curves of output impedance and power effi-
ciency versus frequency. For C1 = C2 = 10 μ F, the output
impedance goes from 27 ? at f OSC = 30kHz to 225 ? at
f OSC = 1kHz. As the 1/fC term becomes large compared to
switch ON resistance term, the output resistance is deter-
mined by 1/fC only.
Voltage Doubling
Figure 8 shows a two diode, capacitive voltage doubler.
With a 5V input, the output is 9.1V with no load and 8.2V
with a 10mA load.
LTC1046
+
+
(see Theory of Operation), and 2) a term related to the ON
resistance of the MOS switches.
At an oscillator frequency of 30kHz and C1 = 10 μ F, the first
term is:
1
2
3
4
BOOST
CAP +
GND
CAP –
V +
OSC
LV
V OUT
8
7
6
5
+
V D
REQUIRED
FOR
V + < 3V
V D
10 μ F
+
V +
1.5V TO 6V
V OUT = 2
(V IN – 1)
10 μ F
R EQUIV =
1
( f OSC / 2 ) ? C1
=
Figure 8. Voltage Doubler
1046 F08
1
15 ? 10 3 ? 10 ? 10 – 6
= 6 . 7 ?.
Ultraprecision Voltage Divider
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.
An ultraprecision voltage divider is shown in Figure 9. To
achieve the 0.0002% accuracy indicated, the load current
should be kept below 100nA. However, with a slight loss
in accuracy, the load current can be increased.
The exact expression for output impedance is complex,
but the dominant effect of the capacitor is clearly shown on
LTC1046
10 μ F
+
1
2
3
LTC1046
CAP + OSC
BOOST V +
GND LV
8
7
6
V +
1.5V TO 6V
REQUIRED FOR V + < 3V
C1
10 μ F
+
1
2
3
4
BOOST
CAP +
GND
CAP –
V +
OSC
LV
V OUT
8
7
6
5
V +
3V TO 12V
CAP –
± 0.002%
4
5
V OUT
T MIN ≤ T A ≤ T MAX
10 μ F
1046 F07
V OUT = –V +
V +
2
T MIN ≤ T A ≤ T MAX
I L ≤ 100nA
+
C2
10 μ F
1046 F09
REQUIRED FOR V + < 6V
Figure 7. Negative Voltage Converter
Figure 9. Ultraprecision Voltage Divider
1046fb
7
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