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參數(shù)資料
| 型號： | LTC1261CS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Switched Capacitor Regulated Voltage Inverter |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 550 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, SO-8 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 310K |
| 代理商： | LTC1261CS8 |
7
LTC1261
APPLICATIO
S I
N
FOR
ATIO
U
W
U
–
+
–
+
CLK
550kHz
S
R
Q
S2
S3
S7
S1
S5
V
CC
OUT
V
OUT
LTC1261 F02
60mV
1.18V
V
REF
= 1.24V
R
ADJ
*
R1*
R0*
*LTC1261CS14 ONLY
C
OUT
C1
–
C1
+
C1
S4
S6
C2
–
50k
100k
226k
INTERNALLY
CONNECTED FOR
FIXED OUTPUT
VOLTAGE PARTS
124k
C2
+
C2
COMP 1
COMP 2
ADJ/COMP
REG
+
Figure 2. Block Diagram
The output voltage is monitored by COMP1 which com-
pares a divided replica of the output at ADJ (COMP for
fixed output parts) to the internal reference. At the begin-
ning of a cycle the clock is low, forcing the output of the
AND gate low and charging the flying capacitors. The next
rising clock edge sets the RS latch, setting the charge
pump to transfer charge from the flying capacitors to the
output capacitor. As long as the output is below the set
point, COMP1 stays low, the latch stays set and the charge
pump runs at the full 50% duty cycle of the clock gated
through the AND gate. As the output approaches the set
voltage, COMP1 will trip whenever the divided signal
exceeds the internal 1.24V reference relative to OUT. This
resets the RS latch and truncates the clock pulses, reduc-
ing the amount of charge transferred to the output capaci-
tor and regulating the output voltage. If the output exceeds
the set point, COMP1 stays high, inhibiting the RS latch
and disabling the charge pump.
COMP2 also monitors the divided signal at ADJ but it is
connected to a 1.18V reference, 5% below the main
reference voltage. When the divided output exceeds this
lower reference voltage indicating that the output is within
5% of the set value, COMP2 goes high turning on the REG
output transistor. This is an open drain N-channel device
capable of sinking 5mA with a 3.3V V
CC
and 8mA with a 5V
V
CC
. When in the “off” state (divided output more than 5%
below V
REF
) the drain can be pulled above V
CC
without
damage up to a maximum of 12V above ground. Note that
the REG output only indicates if the magnitude of the
output is belowthe magnitude of the set point by 5% (i.e.,
V
OUT
> –4.75V for a –5V set point). If the magnitude of the
output is forced higherthan the magnitude of the set point
( i.e., to –6V when the output is set for –5V) the REG
output will stay low.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1261CS8#PBF | 功能描述:IC REG SWITCHD CAP INV ADJ 8SOIC 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 |
| LTC1261CS8#TR | 功能描述:IC REG SWITCHD CAP INV ADJ 8SOIC 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) 供應商設備封裝:8-SOIC |
| LTC1261CS8#TRPBF | 功能描述:IC REG SWITCHD CAP INV ADJ 8SOIC 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) 供應商設備封裝:8-SOIC |
| LTC1261CS8-4 | 功能描述:IC REG SWITCHD CAP INV -4V 8SOIC 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) 供應商設備封裝:8-SOIC |
| LTC1261CS8-4#PBF | 功能描述:IC REG SWITCHD CAP INV -4V 8SOIC 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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