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參數(shù)資料
| 型號： | LT1368 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual and Quad Precision Rail-to-Rail Input and Output Op Amps |
| 中文描述： | 雙和四精密軌到軌輸入和輸出運(yùn)算放大器 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 411K |
| 代理商： | LT1368 |
14
LT1366/LT1367
LT1368/LT1369
TYPICAL APPLICATIO
N
S
Precision Low Dropout Regulator
Microprocessors and complex digital circuits frequently
specify tight control of power supply characteristics. The
circuit shown in Figure 6 provides a precise 3.6V, 1A
output from a minimum 3.8V input voltage. The circuit's
nominal operating voltage is 4.75V
±
5%. The voltage
reference and resistor ratios determine output voltage
accuracy, while the LT1366’s high gain enforces 0.2% line
and load regulation. Quiescent current is about 1mA and
does not change appreciably with supply or load. All
components are available in surface mount packages.
The regulator’s main loop consists of A1 and a logic level
FET, Q1. The output is fed back to the op amp’s positive
input because of the phase inversion through Q1. The
regulator’s frequency response is limited by Q1’s roll-off
and the phase lead introduced by the output capacitor’s
effective series resistance (ESR). Two pole-zero networks
compensate for these effects. The pole formed with R5
and C2 rolls off the gain set with the feedback network,
while the pole formed with R7 and C3 rolls off A1’s gain
directly, which is the dominant influence on settling time.
The zeros formed with R6 and C2, and R8 and C3 provide
phase boost near the unity-gain crossover, which in-
creases the regulator’s phase margin. Although not di-
rectly part of the compensation, R9 decouples the op
amp’s output from Q1’s large gate capacitance.
A second loop provides a foldback current limit. A2
compares the sense voltage across R1 with 50mV refer-
enced to the positive rail. When the sense voltage exceeds
the reference, A2’s output drives Q1’s gate positive via A1.
In current limit, the output voltage collapses and the
current limit LED (D1) turns on causing about 30mV to
drop across R3. A2 regulates Q1’s drain current so that the
deficit between the 50mV reference and the voltage across
R3 is made up across the sense resistor. The reduced
sense voltage is 20mV, which sets the current limit to
about 400mA. As the supply voltage increases, the voltage
across R3 increases, and the current limit folds back to a
lower level. The current limit loop deactivates when the
load current drops below the regulated output current.
When the supply turns on rapidly, C1 bypasses the fold
back circuit allowing the regulator to start-up into a heavy
load.
Q1 does not require a heat sink. When mounted on a type
FR4 PC board, Q1 has a thermal resistance of 50
°
C/W. At
1.4W worst case dissipation, Q1 can operate up to 80
°
C.
C5
47
μ
F
C4
1
μ
F
C1
10
μ
F
C3
6.8nF
R2
2k
R7
13k
R8
2k
R1
0.05
R3
20
R9
100
V
IN
= 4.75V
±
5%
R4
10k
D1
1.5k
Q1
Si9433DY
10k
38.5k*
D2
1N4148
5k
LT1004-1.2
R5*
20k
C2
6.8nF
R6
6.2k
R
MIN
**
1k
C
LOAD
10
F
V
= 3.6V
AT 1A
Q2
2N3904
23.2k
4.75V TO 3.6V LDO AT 1A
1% METAL FILM
SET R
MIN
BASED ON LOAD CHARACTERISTICS
*
**
–
+
–
+
+
50mV
–
1/2 A1
A2
1/2 LT1366
0.1
μ
F
LT1366 F06
+
+
+
Figure 6. Precision 3.6V, 1A Low Dropout Regulator
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1368CN8 | 功能描述:IC OP-AMP R-R IN/OUT DUAL 8-DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| LT1368CN8#PBF | 功能描述:IC OP-AMP R-R IN/OUT DUAL 8-DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| LT1368CN8-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual and Quad Precision Rail-to-Rail Input and Output Op Amps |
| LT1368CN8-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual and Quad Precision Rail-to-Rail Input and Output Op Amps |
| LT1368CS8 | 功能描述:IC OP-AMP R-R IN/OUT DUAL 8-SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
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