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参数资料
| 型号： | LTC1144CS8 |
| 厂商： | Linear Technology |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP INV 8SOIC |
| 标准包装： | 100 |
| 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： | 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： | 管件 |
| 供应商设备封装： | 8-SOIC |
LTC1144
TEST CIRCUITS
V +
15V
1
2
8
7
EXTERNAL
I S
C1
10 μ F
+
3
4
LTC1144
6
5
C OSC
OSCILLATOR R
L
I L
C2
10 μ F
V OUT
1144 F01
Figure 1.
A PPLICATI
Theory of Operation
S I FOR ATIO
To understand the theory of operation of the LTC1144, a
review of a basic switched-capacitor building block is
helpful.
V1
R EQUIV
C2
R L
V2
In Figure 2, when the switch is in the left position, capacitor
C1 will charge to voltage V1. The total charge on C1 will be
R EQUIV =
1
f × C1
1144 F03
q1 = C1V1. The switch then moves to the right, discharg-
ing C1 to voltage V2. After this discharge time, the charge
on C1 is q2 = C1V2. Note that charge has been transferred
from the source V1 to the output V2. The amount of charge
transferred is:
? q = q1 – q2 = C1(V1 – V2)
Figure 3. Switched-Capacitor Equivalent Circuit
Examination of Figure 4 shows that the LTC1144 has the
same switching action as the basic switched-capacitor
building block. With the addition of finite switch on-
resistance and output voltage ripple, the simple theory,
although not exact, provides an intuitive feel for how the
V1
f
C1
C2
R L
V2
device works.
For example, if you examine power conversion efficiency
as a function of frequency (see Figure 5), this simple
1144 F02
Figure 2. Switched-Capacitor Building Block
theory will explain how the LTC1144 behaves. The loss,
V +
If the switch is cycled f times per second, the charge
(8)
SW1
CAP +
SW2
transfer per unit time (i.e., current) is:
(2)
I = f × ? q = f × C1(V1 – V2)
BOOST
10X
φ
C1
+
Rewriting in terms of voltage and impedance equivalence,
(1)
OSC
OSC
÷ 2
φ
CAP –
V OUT
I =
V1 ? V 2
? 1 ?
? ?
? f × C 1 ?
=
V1 ? V 2
R EQUIV
(7)
SHDN
(6)
(4)
GND
(3)
(5)
C2
+
1144 F04
A new variable R EQUIV has been defined such that R EQUIV
= 1/(f × C1). Thus, the equivalent circuit for the switched-
capacitor network is as shown in Figure 3.
Figure 4. LTC1144 Switched-Capacitor
Voltage Converter Block Diagram
5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1144CS8#PBF | 功能描述:IC REG SWITCHED CAP INV 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC1144CS8#TR | 功能描述:IC REG SWITCHED CAP INV 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 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 |
| LTC1144CS8#TRPBF | 功能描述:IC REG SWITCHED CAP INV 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 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 |
| LTC1144CS8PBF | 制造商:Linear Technology 功能描述:LTC1144CS8PBF |
| LTC1144I | 制造商:LINER 制造商全称:Linear Technology 功能描述:Switched-Capacitor Wide Input Range Voltage Converter with Shutdown |
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