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| 型号： | LTC660CN8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG DBL INV ADJ 0.1A 8DIP |
| 标准包装： | 50 |
| 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： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
LTC660
APPLICATIO N S I N FOR M ATIO N
Theory of Operation
V +
To understand the theory of operation for the LTC660, a
review of a basic switched-capacitor building block is
helpful. In Figure 2, when the switch is in the left position,
capacitor C1 will charge to voltage V1. The total charge on
BOOST
4.5 ×
(1)
OSC
(8)
+2
φ
SW1
CAP +
(2)
+
C1
SW2
C1 will be q1 = C1V1. The switch then moves to the right,
discharging C1 to voltage V2. After this discharging time,
OSC
(7)
φ
CAP –
(4)
V OUT
(5)
the charge on C1 is q2 = C1V2. Note that charge has been
transferred from the source V1 to the output V2. The
C2
amount of charge transferred is:
? q = q1 – q2 = C1 (V1 – V2)
LV
(6)
CLOSED WHEN
V + > 3.0V
GND
(3)
LTC660 ? F04
If the switch is cycled “f” times per second, the charge
transfer per unit time (i.e., current) is:
I = f ? ? q = f ? C1 (V1 – V2)
Rewriting in terms of voltage and impedance equivalence,
Figure 4. LTC660 Switched-Capacitor Voltage Converter
Block Diagram
This simplified circuit does not include finite on-resistance
of the switches and output voltage ripple, however, it does
give an intuitive feel for how the device works. For ex-
I =
V1 ? V 2
1 / fC 1
=
V1 ? V 2
R EQUIV
ample, if you examine power conversion efficiency as a
function of frequency this simple theory will explain how
the LTC660 behaves. The loss and hence the efficiency is
A new variable R EQUIV has been defined such that
R EQUIV = 1/fC1. Thus, the equivalent circuit for the switched-
capacitor network is as shown in Figure 3.
Figure 4 shows that the LTC660 has the same switching
action as the basic switched-capacitor building block.
set by the output impedance. As frequency is decreased,
the output impedance will eventually be dominated by the
1/fC1 term and voltage losses will rise decreasing the
efficiency. As the frequency increases the quiescent cur-
rent increases. At high frequency this current loss be-
comes significant and the power efficiency starts to de-
crease.
V1
C1
C2
R L
V2
The LTC660 oscillator frequency is designed to run where
the voltage loss is a minimum. With the external 150 μ F
capacitors the effective output impedance is determined
660 F02
Figure 2. Switched-Capacitor Building Block
by the internal switch resistances and the capacitor ESRs.
LV (Pin 6)
V1
R EQUIV
C2
R L
V2
The internal logic of the LTC660 runs between V + and LV
(Pin 6). For V + ≥ 3V, an internal switch shorts LV to ground
(Pin 3). For V + < 3V, the LV pin should be tied to ground.
For V + ≥ 3V, the LV pin can be tied to ground or left floating.
OSC (Pin 7) and BOOST (Pin 1)
R EQUIV =
1
fC1
660 F03
The switching frequency can be raised, lowered or driven
6
Figure 3. Switched-Capacitor Equivalent Circuit
from an external source. Figure 5 shows a functional
diagram of the oscillator circuit.
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| LTC660CS8 | 功能描述:IC REG DBL INV ADJ 0.1A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC660CS8#PBF | 功能描述:IC REG DBL INV ADJ 0.1A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC660CS8#TR | 功能描述:IC REG DBL INV ADJ 0.1A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC660CS8#TRPBF | 功能描述:IC REG DBL INV ADJ 0.1A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC660CS8PBF | 制造商:Linear Technology 功能描述:Charge Pump Inv/Step-Up 100mA SOIC8 |
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