- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377727 > LTC1046IS8 (LINEAR TECHNOLOGY CORP) Programmable Logic Controller; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No RoHS Compliant: No PDF資料下載
參數(shù)資料
| 型號(hào)： | LTC1046IS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Programmable Logic Controller; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No RoHS Compliant: No |
| 中文描述： | 0.05 A SWITCHED CAPACITOR CONVERTER, 30 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, SOIC-8 |
| 文件頁(yè)數(shù)： | 5/12頁(yè) |
| 文件大小： | 172K |
| 代理商： | LTC1046IS8 |
5
LTC1046
U
S
A
Rewriting in terms of voltage and impedance equivalence,
O
PPLICATI
U
U
I
V
(
V
fC
V
R
EQUIV
V
=
)
=
1
1
2
1
1
2
–
/
–
.
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.
As frequency is decreased, the output impedance will
eventually be dominated by the 1/fC1 term and power
efficiency will drop. The typical curves for power effi-
ciency versus frequency show this effect for various capaci-
tor values.
Note also that power efficiency decreases as frequency
goes up. This is caused by internal switching losses which
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
the power efficiency starts to decrease.
LV (Pin 6)
The internal logic of the LTC1046 runs between V
+
and LV
(Pin 6). For V
+
greater than or equal to 3V, an internal
switch shorts LV to GND (Pin 3). For V
+
less than 3V, the
LV pin should be tied to ground. For V
+
greater than or
equal to 3V, the LV pin can be tied to ground or left floating.
OSC (Pin 7) and BOOST (Pin 1)
The switching frequency can be raised, lowered or driven
from an external source. Figure 5 shows a functional
diagram of the oscillator circuit.
Figure 3. Switched Capacitor Equivalent Circuit
Figure 4. LTC1046 Switched Capacitor
Voltage Converter Block Diagram
Figure 5. Oscillator
Examination of Figure 4 shows that the LTC1046 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
device works.
For example, if you examine power conversion efficiency
as a function of frequency (see typical curve), this simple
theory will explain how the LTC1046 behaves. The loss,
and hence the efficiency, is set by the output impedance.
C2
R
EQUIV
=
1046 F03
V2
V1
R
L
R
EQUIV
1
fC1
1046 F04
CAP+
(2)
+
CAP–
(4)
GND
(3)
V
(5)
V
+
(8)
LV
(6)
3x
(1)
OSC
(7)
OSC
+2
CLOSED WHEN
V
+
> 3.0V
C1
C2
BOOST
SW1
SW2
φ
φ
+
OSC
(7)
1046 F05
LV
(6)
BOOST
(1)
～
14pF
I
2I
I
2I
V
+
SCHMITT
TRIGGER
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1046MJ8 | “Inductorless” 5V to + 5V Converter |
| LTC1046CS8 | “Inductorless” 5V to + 5V Converter |
| LTC1046C | “Inductorless” 5V to + 5V Converter |
| LTC1046I | “Inductorless” 5V to + 5V Converter |
| LTC1046M | “Inductorless” 5V to + 5V Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1046IS8#PBF | 功能描述:IC REG SWITCHD CAP DIV INV 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)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(kāi)關(guān):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(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC1046IS8#TR | 功能描述:IC REG SWITCHD CAP DIV INV 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 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，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1046IS8#TRPBF | 功能描述:IC REG SWITCHD CAP DIV INV 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 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，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1046IS8PBF | 制造商:Linear Technology 功能描述:Charge Pump Inv/Step-Up/Dn 50mA SOIC8 |
| LTC1046M | 制造商:LINER 制造商全稱:Linear Technology 功能描述:“Inductorless” 5V to + 5V Converter |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。