- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377765 > LTC1911EMS8-1.5 (LINEAR TECHNOLOGY CORP) Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter PDF資料下載
參數(shù)資料
| 型號： | LTC1911EMS8-1.5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 200K |
| 代理商： | LTC1911EMS8-1.5 |
8
LTC1911-1.5/LTC1911-1.8
sn1911 1911is
4.7nF capacitor on SS/SHDN results in a 3ms ramp time
from 0.6V to 1.9V on the pin. If C
OUT
is 10
μ
F, the 3ms V
REF
ramp time results in an average C
OUT
charge current of
only 6mA (see Figure 2).
Low Current Burst Mode Operation
To improve efficiency at low output currents, a Burst Mode
function was included in the design of the LTC1911. An
output current sense circuit is used to detect when the
required output current drops below 30mA typ. When this
occurs, the oscillator shuts down and the part goes into a
low current operating state. The LTC1911 will remain in
the low current operating state until V
OUT
has dropped
enough to require another burst of current. Unlike tradi-
tional charge pumps who’s burst current is dependant on
many factors (i.e., supply, switch strength, capacitor
selection, etc.), the LTC1911 burst current is set by the
burst threshold. This means that the output ripple voltage
during Burst Mode operaton will be fixed and is typically
5mV.
Short-Circuit/Thermal Protection
The LTC1911 has built-in short-circuit current limiting as
well as overtemperature protection. During short-circuit
conditions it will automatically limit its output current to
approximately 600mA. The LTC1911 will shut down if the
junction temperature exceeds approximately 160
°
C. Un-
der normal operating conditions, the LTC1911 should not
go into thermal shutdown but it is included to protect the
IC in cases of excessively high ambient temperatures, or
in cases of excessive power dissipation inside the IC (i.e.,
overcurrent or short circuit). The charge transfer will
reactivate once the junction temperature drops back to
approximately 150
°
C. The LTC1911 can cycle in and out
of thermal shutdown indefinitely without latch-up or
damage until the fault condition is removed.
V
OUT
Ripple and Capacitor Selection
The type and value of capacitors used with the
LTC1911 determine several important parameters such
as regulator control loop stability, output ripple and
charge pump strength.
The value of C
OUT
directly controls the amount of output
ripple for a given load current. Increasing the size of C
OUT
will reduce the output ripple.
APPLICATIU
W
U
U
Figure 2. Shutdown/Soft-Start Operation
SS/SHDN
C
SS
ON OFF V
CTRL
6
8
V
OUT
R
LOAD
LTC1911
(2a)
V
2V/DIV
V
1V/DIV
C
SS
= 0nF
C
OUT
= 10
μ
F
R
LOAD
= 10
2ms/DIV
1911 F02b
(2b)
V
2V/DIV
V
1V/DIV
C
SS
= 4.7nF
C
OUT
= 10
μ
F
R
OUT
= 10
2ms/DIV
1911 F02c
(2c)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1911EMS8-1.8 | Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter |
| LTC1921 | Dual .48V Supply and Fuse Monitor |
| LTC1921CMS8 | Dual .48V Supply and Fuse Monitor |
| LTC1921IMS8 | Dual .48V Supply and Fuse Monitor |
| LTC1923 | High Efficiency Thermoelectric Cooler Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1920BCSW | 制造商:Linear Technology 功能描述: |
| LTC1921CMS8 | 功能描述:IC DUAL PWR SUPPLY MONITOR 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC1921CMS8#PBF | 功能描述:IC DUAL PWR SUPPLY MONITOR 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC1921CMS8#TR | 功能描述:IC DUAL PWR SUPPLY MONITOR 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC1921CMS8#TRPBF | 功能描述:IC DUAL PWR SUPPLY MONITOR 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。