參數(shù)資料
型號(hào)： MAX687_8_9
廠商： Maxim Integrated Products, Inc.
文件頁數(shù)： 9/12頁
文件大小： 103K
代理商： MAX687_8_9
__________Applic ations Information
High-Power Output Circ uit
Figure 3 shows a pseudo-Darlington transistor configu-
ration to increase load-current capability and maintain
a low dropout voltage with a 4A load. A heatsink must
be added when high power is dissipated in the pass
transistor.
Figure 4 shows the (V
IN
- V
OUT
) voltage required to
maintain regulation for different load currents. Figure 5
shows an oscilloscope plot of the transient response of
a 200mA to 4A load step.
M
High-Ac c urac y, Low-Dropout
Linear Regulators
_______________________________________________________________________________________
9
MAX688
MAX689
OUT
3.3V/ 3.0V @ 4A
PFO
CC
C1
220
μ
F
+5V INPUT
BLIM
GND
BASE
IN
Q2
2N4403
C3
10nF
SHDN
R2
100k
C2
470
μ
F
x3
Q1
T1P42
10
1k
ON / OFF
POWER FAIL
Figure 3. 4A Low-Dropout Circuit
1.0
0
0
4000
1000
2000
3000
DROPOUT VOLTAGE vs. LOAD CURRENT
0.2
0.1
0.4
0.3
0.6
0.5
0.8
0.9
0.7
M
LOAD CURRENT (mA)
V
I
O
Q1 = TIP42
BASE = BLIM
Figure 4. Dropout Voltage vs. Load Current of Figure 3
V
+3.3V, 20mV/div
I
1A/div
50
μ
s/div
LOAD-TRANSIEN
Figure 5. Transient Response for a 200mA to 4A Load Step
Using Circuit of Figure 3
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX6878ETG 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX6878ETG+ 功能描述:監(jiān)控電路 Dual Power-Sup Sequencer RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX6878ETG+T 功能描述:監(jiān)控電路 Dual Power-Sup Sequencer RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX6878ETG-T 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX6879ETE 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
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