- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377773 > LTC3200 (Linear Technology Corporation) Low Noise, Regulated Charge Pump DC/DC Converters(可調(diào)輸出，低噪聲，穩(wěn)壓型，電荷泵DC/DC變換器（8-腳MSOP封裝）) PDF資料下載
參數(shù)資料
| 型號： | LTC3200 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Noise, Regulated Charge Pump DC/DC Converters(可調(diào)輸出，低噪聲，穩(wěn)壓型，電荷泵DC/DC變換器（8-腳MSOP封裝）) |
| 中文描述： | 低噪聲，穩(wěn)壓電荷泵DC / DC轉(zhuǎn)換器（可調(diào)輸出，低噪聲，穩(wěn)壓型，電荷泵型DC / DC變換器（8 -腳型MSOP封裝）） |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 178K |
| 代理商： | LTC3200 |
LTC3200/LTC3200-5
6
OPERATIOU
Operation (Refer to Simplified Block Diagrams)
The LTC3200/LTC3200-5 use a switched capacitor charge
pump to boost V
IN
to a regulated 5V
±
4% output voltage.
Regulation is achieved by sensing the output voltage
through an internal resistor divider (LTC3200-5) and
modulating the charge pump output current based on the
error signal. A 2-phase nonoverlapping clock activates the
charge pump switches. The flying capacitor is charged
from V
IN
on the first phase of the clock. On the second
phase of the clock it is stacked in series with V
IN
and
connected to V
OUT
. This sequence of charging and dis-
charging the flying capacitor continues at a free running
frequency of 2MHz (typ).
In shutdown mode all circuitry is turned off and the
LTC3200/LTC3200-5 draw only leakage current from the
V
IN
supply. Furthermore, V
OUT
is disconnected from V
IN
.
The SHDN pin is a CMOS input with a threshold voltage of
approximately 0.8V. The LTC3200/LTC3200-5 is in shut-
down when a logic low is applied to the SHDN pin. Since
the SHDN pin is a high impedance CMOS input it should
never be allowed to float. To ensure that its state is defined
it must always be driven with a valid logic level.
Short-Circuit/Thermal Protection
The LTC3200/LTC3200-5 have built-in short-circuit current
limiting as well as overtemperature protection. During
short-circuit conditions, they will automatically limit their
output current to approximately 225mA. At higher tempera-
tures, or if the input voltage is high enough to cause exces-
sive self heating on chip, thermal shutdown circuitry will
shut down the charge pump once the junction temperature
exceeds approximately 160
°
C. It will reenable the charge
pump once the junction temperature drops back to approxi-
mately 155
°
C. The LTC3200/LTC3200-5 will cycle in and
out of thermal shutdown indefinitely without latch-up or
damage until the short-circuit on V
OUT
is removed.
Soft-Start
The LTC3200/LTC3200-5 have built-in soft-start circuitry
to prevent excessive current flow at V
IN
during start-up.
The soft-start time is preprogrammed to approximately
1ms, so the start-up current will be primarily dependent
upon the output capacitor. The start-up input current can
be calculated with the expression:
I
C
V
1
ms
STARTUP
OUT
OUT
=
2
For example, with a 2.2
μ
F output capacitor the start-up
input current of an LTC3200-5 will be approximately
22mA. If the output capacitor is 10
μ
F then the start-up
input current will be about 100mA.
Programming the LTC3200 Output Voltage (FB Pin)
While the LTC3200-5 version has an internal resistive
divider to program the output voltage, the programmable
LTC3200 may be set to an arbitrary voltage via an external
resistive divider. Since it employs a voltage doubling
charge pump, it is not possible to achieve output voltages
greater than twice the available input voltage. Figure 1
shows the required voltage divider connection.
The voltage divider ratio is given by the expression:
R
R
V
.
V
OUT
1
2
1 268
1
=
–
Typical values for total voltage divider resistance can
range from several k
s up to 1M
.
8
7
4
V
OUT
FB
PGND
SGND
R1
32005 F01
C
OUT
R2
5
V
OUT
1.268V 1 +R2
(
)
Figure 1. Programming the Adjustable LTC3200
V
IN
, V
OUT
Capacitor Selection
The style and value of capacitors used with the LTC3200/
LTC3200-5 determine several important parameters such
as regulator control loop stability, output ripple, charge
pump strength and minimum start-up time.
To reduce noise and ripple, it is recommended that low
ESR (<0.1
) ceramic capacitors be used for both C
IN
and C
OUT
. These capacitors should be 0.47
μ
F or greater.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3200-5 | Low Noise, Regulated Charge Pump DC/DC Converters(5V輸出，低噪聲，穩(wěn)壓型，電荷泵DC/DC變換器（6-腳SOT-23封裝）) |
| LTC3204 | Low Noise Regulated Charge Pump in 2 X 2 DFN |
| LTC3204BEDC-3.3 | Low Noise Regulated Charge Pump in 2 X 2 DFN |
| LTC3204BEDC-5 | Low Noise Regulated Charge Pump in 2 X 2 DFN |
| LTC3204-5 | Low Noise Regulated Charge Pump in 2 X 2 DFN |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3200-5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:DC/DC CONVERTERl |
| LTC3200EMS8 | 功能描述:IC REG SWITCHED CAP DBL 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:500 系列:- 類型:切換式電容器（充電泵），反相 輸出類型:固定 輸出數(shù):1 輸出電壓:-3V 輸入電壓:2.3 V ~ 5.5 V PWM 型:Burst Mode? 頻率 - 開關(guān):900kHz 電流 - 輸出:100mA 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:SOT-23-6 細型，TSOT-23-6 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:TSOT-23-6 其它名稱:LTC1983ES6-3#TRMTR |
| LTC3200EMS8#PBF | 功能描述:IC REG SWITCHED CAP DBL 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:500 系列:- 類型:切換式電容器（充電泵），反相 輸出類型:固定 輸出數(shù):1 輸出電壓:-3V 輸入電壓:2.3 V ~ 5.5 V PWM 型:Burst Mode? 頻率 - 開關(guān):900kHz 電流 - 輸出:100mA 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:SOT-23-6 細型，TSOT-23-6 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:TSOT-23-6 其它名稱:LTC1983ES6-3#TRMTR |
| LTC3200EMS8#TR | 功能描述:IC REG SWITCHED CAP DBL 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)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(diào)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(guān):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(yīng)商設(shè)備封裝:8-SOIC |
| LTC3200EMS8#TRPBF | 功能描述:IC REG SWITCHED CAP DBL 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)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(diào)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(guān):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(yīng)商設(shè)備封裝:8-SOIC |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。