- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377765 > LTC1875EGN (LINEAR TECHNOLOGY CORP) 15mA Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator PDF資料下載
參數(shù)資料
| 型號： | LTC1875EGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 15mA Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator |
| 中文描述： | 3 A SWITCHING REGULATOR, 605 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大小： | 257K |
| 代理商： | LTC1875EGN |
9
LTC1875
1875f
Power Good Indicator
The power good function monitors the output voltage in all
modes of operation. Its open-drain output is pulled low
when the output voltage is not within
±
7.5% of its nomi-
nally regulated voltage. The feedback voltage is filtered
before it is fed to a power good window comparator in
order to prevent false tripping of the power good signal
during fast transients. The window comparator monitors
the output voltage even in Burst Mode operation. In
shutdown mode, open drain is actively pulled low to
indicate that the output voltage is invalid.
Short-Circuit Protection
When the output is shorted to ground, the frequency of
the oscillator is reduced to about 80kHz, 1/7 the nominal
frequency. This frequency foldback ensures that the in-
ductor current has more time to decay, thereby preventing
runaway. The oscillator’s frequency will progressively
increase to 550kHz (or to the synchronized frequency)
when V
FB
rises above 0.3V.
Frequency Synchronization
The LTC1875 can be synchronized to an external clock
source connected to the SYNC/MODE pin. The turn-on of
the top MOSFET is synchronized to the rising edge of the
external clock.
When the LTC1875 is clocked by an external source, Burst
Mode operation is disabled. In this synchronized mode,
when the output load current is very low, current compara-
tor, I
COMP
, may remain tripped for several cycles and force
the main switch to stay off for the same number of cycles.
Increasing the output load slightly allows constant fre-
quency PWM operation to resume.
Frequency synchronization is inhibited when the feedback
voltage V
FB
is below 0.6V. This prevents the external clock
from interfering with the frequency foldback for short-
circuit protection.
Low Dropout Operation
When the input supply voltage decreases toward the
output voltage in a buck regulator, the duty cycle in-
creases toward the maximum on-time. Further reduction
of the supply voltage forces the main switch to remain on
for more than one cycle until it reaches 100% duty cycle.
The output voltage will then be determined by the input
voltage minus the voltage drop across the top MOSFET
and the inductor.
Low Supply Operation
The LTC1875 is designed to operate down to an input
supply voltage of 2.65V although the maximum allowable
output current is reduced at this low voltage. Figure 2
shows the reduction in the maximum output current as a
function of input voltage.
Another important detail to remember is that at low input
supply voltages, the R
DS(ON)
of the P-channel switch
increases. Therefore, the user should calculate the power
dissipation when the LTC1875 is used at 100% duty cycle
with low supply voltage (see Thermal Considerations in
the Applications Information section).
INPUT VOLTAGE (V)
2.5
0
M
500
1000
1500
2000
3.5
4.5
5.5
6.5
1875 F02
7.5
V
OUT
= 1.5V
V
OUT
= 2.5V
V
OUT
= 3.3V
Figure 2. Maximum Output Current vs Input Voltage
OPERATIOU
(Refer to Block Diagram)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1877 | High Efficiency Monolithic Synchronous Step-Down Regulator(高效率,單片同步步降穩(wěn)壓器) |
| LTC1878 | High Efficiency Monolithic Synchronous Step-Down Regulator(高效率,單片同步步降穩(wěn)壓器) |
| LTC1911-15 | Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter |
| LTC1911EMS8-1.5 | Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter |
| LTC1911EMS8-1.8 | Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1875EGN#PBF | 功能描述:IC REG BUCK SYNC ADJ 1.5A 16SSOP 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: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 |
| LTC1875EGN#TR | 功能描述:IC REG BUCK SYNC ADJ 1.5A 16SSOP 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: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) 供應商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1875EGN#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 1.5A 16SSOP 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: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) 供應商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1876EG | 功能描述:IC REG CTRLR BST PWM CM 36-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1876EG#PBF | 功能描述:IC REG CTRLR BST PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
發(fā)布緊急采購，3分鐘左右您將得到回復。