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參數(shù)資料
| 型號(hào)： | LTC1911-15 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter |
| 中文描述： | 低噪聲，無電感器步高效型DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 200K |
| 代理商： | LTC1911-15 |
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)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1911EMS8-1.5#PBF | 功能描述:IC REG BUCK 1.5V 0.25A 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(biāo)準(zhǔn)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 |
| LTC1911EMS8-1.5#TR | 功能描述:IC REG BUCK 1.5V 0.25A 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(biāo)準(zhǔn)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 |
| LTC1911EMS8-1.5#TRPBF | 功能描述:IC REG BUCK 1.5V 0.25A 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(biāo)準(zhǔn)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 |
| LTC1911EMS8-1.8 | 功能描述:IC REG BUCK 1.8V 0.25A 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(biāo)準(zhǔn)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 |
| LTC1911EMS8-1.8#PBF | 功能描述:IC REG BUCK 1.8V 0.25A 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(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)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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