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參數(shù)資料
| 型號： | LTC1265-3.3 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1.2A, High Efficiency Step-Down Current Mode DC/DC Converter(3.3V,12A,高效率,電流模式步降DC/DC變換器) |
| 中文描述： | 1.2A的，高效率降壓型電流模式DC / DC轉(zhuǎn)換器（3.3V，12A條，高效率，電流模式步降直流/直流變換器） |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 233K |
| 代理商： | LTC1265-3.3 |
9
LTC1265/LTC1265-3.3/LTC1265-5
Figure 3. Low-Battery Comparator
Figure 4. LTC1265 Adjustable Configuration
The output, Pin 3, is an N-channel open drain that goes low
when the battery voltage is below the threshold set by R3
and R4. In shutdown, the comparator is disabled and Pin
3 is in a high impedance state.
LTC1265 ADJUSTABLE APPLICATIONS
The LTC1265 develops a 1.25V reference voltage between
the feedback (Pin 9) terminal and signal ground (see
Figure 4). By selecting resistor R1, a constant current is
caused to flow through R1 and R2 to set overall output
voltage. The regulated output voltage is determined by:
R1
)
For most applications a 30k resistor is suggested for R1.
To prevent stray pickup, a 100pF capacitor is suggested
across R1 located close to the LTC1265.
V
OUT
= 1.25 1 + R2
)
Absolute Maximum Ratings and Latchup Prevention
The absolute maximum ratings specify that SW (Pin 14)
can never exceed V
IN
(Pins 1, 2, 13) by more than 0.3V.
Normally this situation should never occur. It could,
however, if the output is held up while the V
IN
supply is
pulled down. A condition where this could potentially
occur is when a battery is supplying power to an LTC1265
regulator and also to one or more loads in parallel with the
the regulator’s V
IN
. If the battery is disconnected while the
LTC1265 regulator is supplying a light load and one of the
parallel circuits has a heavy load, the input capacitor of the
LTC1265 regulator could be pulled down faster than the
output capacitor, causing the absolute maximum ratings
to be exceeded. The result is often a latchup which can be
destructive if V
IN
is reapplied quickly. Battery disconnect
is possible as a result of mechanical stress, bad battery
contacts or use of a lithium-ion battery with a built-in
internal disconnect. The user needs to assess his/her
application to determine whether this situation could
occur. If so, additional protection is necessary.
Prevention against latchup can be accomplished by
simply connecting a Schottky diode across the SW and
V
IN
pins as shown in Figure 5. The diode will normally be
reverse biased unless V
IN
is pulled below V
OUT
at which
time the diode will clamp the (V
OUT
– V
IN
) potential to less
than the 0.6V required for latchup. Note that a low leakage
Schottky should be used to minimize the effect on no-
load supply current. Schottky diodes such as MBR0530,
BAS85 and BAT84 work well. Another more serious
effect of the protection diode leakage is that at no load
with nothing to provide a sink for this leakage current, the
1.25V REFERENCE
LTC1265
V
IN
4
3
–
+
LTC1265 F03
R4
R3
100pF
R1
R2
V
OUT
9
LTC1265 F04
V
FB
LTC1265
11
SGND
1265 F05
PWR
V
IN
V
OUT
LATCHUP
PROTECTION
SCHOTTKY
SW
LTC1265
+
Figure 5. Preventing Absolute Maximum
Ratings from Being Exceeded
APPLICATIOU
W
U
U
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| LTC1265-5 | 1.2A, High Efficiency Step-Down Current Mode DC/DC Converter(5V,12A,高效率,電流模式步降DC/DC變換器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC1265CS | 功能描述:IC REG BUCK ADJ 1.2A 14SOIC 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: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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1265CS#PBF | 功能描述:IC REG BUCK ADJ 1.2A 14SOIC 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: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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1265CS#TR | 功能描述:IC REG BUCK ADJ 1.2A 14SOIC 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: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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1265CS#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 14SOIC 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: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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC1265CS-3.3 | 功能描述:IC REG BUCK 3.3V 1.2A 14SOIC 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: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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
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