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參數資料
| 型號： | LTC660CN8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 100mA CMOS Voltage Converter |
| 中文描述： | SWITCHED CAPACITOR CONVERTER, 45 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數： | 8/12頁 |
| 文件大小： | 262K |
| 代理商： | LTC660CN8 |
8
LTC660
TYPICAL APPLICATIO
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.
U
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.
1
2
3
4
8
7
6
5
BOOST
CAP
+
GND
CAP
–
LTC660 F08
C1
150
μ
F
V
OUT
= 2V
IN
V
IN
2.5V
TO 5.5V
LTC660
1N5817*
V
+
OSC
LV
V
OUT
C2
150
μ
F
* SCHOTTKY DIODE IS FOR START-UP ONLY
+
+
Figure 8. Voltage Doubler
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-
resistance of the MOS switches.
At an oscillator frequency of 10kHz and C1 = 150
μ
F, the
first term is:
R
=
1
f
/2
EQUIV
OSC
1
150 10
(
)
=
=
C1
5 10
1 3
.
3
6
–
.
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.
Ultraprecision Voltage Divider
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.
1
2
3
4
8
7
6
5
BOOST
CAP
+
GND
CAP
–
C2
150
μ
F
LTC660 F07
C1
150
μ
F
V
OUT
= –V
IN
V
1.5V TO 5.5V
LTC660
V
+
OSC
LV
V
OUT
+
+
Figure 7. Voltage Inverter
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).
Figure 9. Ultraprecision Voltage Divider
8
7
6
5
4
3
2
1
C1
150
μ
F
±
0.002%
V
+
3V TO 11V
LTC660 F09
T
MIN
≤
T
A
≤
T
I
L
≤
100nA
C2
150
μ
F
2
V
+
LTC660
+
+
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC660CN8#PBF | 功能描述:IC REG DBL INV ADJ 0.1A 8DIP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數:1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LTC660CS8 | 功能描述:IC REG DBL INV ADJ 0.1A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:10-MSOP 裸露焊盤 |
| LTC660CS8#PBF | 功能描述:IC REG DBL INV ADJ 0.1A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:10-MSOP 裸露焊盤 |
| LTC660CS8#TR | 功能描述:IC REG DBL INV ADJ 0.1A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:10-MSOP 裸露焊盤 |
| LTC660CS8#TRPBF | 功能描述:IC REG DBL INV ADJ 0.1A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:10-MSOP 裸露焊盤 |
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