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參數(shù)資料
| 型號： | LT1054CDWRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 35 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, SOIC-16 |
| 文件頁數(shù)： | 29/30頁 |
| 文件大?。?/td> | 607K |
| 代理商： | LT1054CDWRG4 |
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LT1054
SWITCHED-CAPACITOR VOLTAGE CONVERTERS
WITH REGULATORS
SLVS033F FEBRUARY 1990 REVISED NOVEMBER 2004
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
A review of a basic switched-capacitor building block is helpful in understanding the operation of the LT1054. When
the switch shown in Figure 12 is in the left position, capacitor C1 charges to the voltage at V1. The total charge on
C1 is q1 = C1V1. When the switch is moved to the right, C1 is discharged to the voltage at V2. After this discharge
time, the charge on C1 is q2 = C1V2. The charge has been transferred from the source V1 to the output V2. The
amount of charge transferred is shown in equation 1.
Dq + q1 * q2 + C1(V1 * V2)
If the switch is cycled f times per second, the charge transfer per unit time (i.e., current) is as shown in equation 2.
I
+ f
Dq + f
C1(1
* V2)
To obtain an equivalent resistance for a switched-capacitor network, this equation can be rewritten in terms of voltage
and impedance equivalence as shown in equation 3.
I
+ V1 * V2
1 fC1
+ V1 * V2
R
EQUIV
C2
C1
V2
f
V1
RL
Figure 12. Switched-Capacitor Building Block
A new variable, REQUIV, is defined as REQUIV = 1 ÷ fC1. The equivalent circuit for the switched-capacitor network is
shown in Figure 13. The LT1054 has the same switching action as the basic switched-capacitor building block. Even
though this simplification does not include finite switch-on resistance and output-voltage ripple, it provides an insight
into how the device operates.
C2
V2
V1
RL
REQUIV
R
EQUIV +
1
fC1
Figure 13. Switched-Capacitor Equivalent Circuit
These simplified circuits explain voltage loss as a function of oscillator frequency (see Figure 7). As oscillator
frequency is decreased, the output impedance eventually is dominated by the 1/fC1 term, and voltage losses rise.
Voltage losses also rise as oscillator frequency increases. This is caused by internal switching losses that occur due
to some finite charge being lost on each switching cycle. This charge loss per-unit-cycle, when multiplied by the
switching frequency, becomes a current loss. At high frequency, this loss becomes significant and voltage losses
again rise.
The oscillator of the LT1054 is designed to operate in the frequency band where voltage losses are at a minimum.
(1)
(2)
(3)
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| LT1054IDW | SWITCHED CAPACITOR REGULATOR, 35 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT1054IDWR | SWITCHED CAPACITOR REGULATOR, 35 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT1054CP | SWITCHED CAPACITOR REGULATOR, 35 kHz SWITCHING FREQ-MAX, PDIP8 |
| LT1054Y | SWITCHED CAPACITOR REGULATOR, 35 kHz SWITCHING FREQ-MAX, UUC8 |
| LT1054CDWRE4 | SWITCHED CAPACITOR REGULATOR, 35 kHz SWITCHING FREQ-MAX, PDSO16 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1054CN8 | 功能描述:IC REG SWITCHED CAP DBL INV 8DIP 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:升壓（升壓） 輸出類型:可調式 輸出數(shù):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 |
| LT1054CN8#PBF | 功能描述:IC REG SWITCHED CAP DBL INV 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:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關:2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應商設備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT1054CN8PBF | 制造商:Linear Technology 功能描述:DC-DC converter,LT1054CN8 -Vin/2Vin 20mA |
| LT1054CP | 功能描述:電荷泵 Bipolar Regulated V RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| LT1054CP | 制造商:Texas Instruments 功能描述:DC/DC Charge Pump Converter IC |
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