MAX688EPA データシートの表示（PDF） - Maxim Integrated
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MAX688EPA Datasheet PDF : 12 Pages
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High-Accuracy, Low-Dropout
Linear Regulators
__________Applications Information
High-Power Output Circuit
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 (VIN - VOUT) 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.
+5V INPUT
Q1
T1P42
Q2
2N4403
1kΩ
10Ω
C1
220µF
ON / OFF
BASE
IN
BLIM
OUT
MAX688
MAX689
SHDN
PFO
GND
CC
C3
10nF
3.3V/ 3.0V @ 4A
R2
100kΩ
C2
470µF
x3
POWER FAIL
DROPOUT VOLTAGE vs. LOAD CURRENT
1.0
Q1 = TIP42
0.9 Q2 = 2N4403
0.8 BASE = BLIM
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
1000
2000
3000
LOAD CURRENT (mA)
4000
Figure 4. Dropout Voltage vs. Load Current of Figure 3
LOAD-TRANSIENT RESPONSE
VOUT
+3.3V, 20mV/div
50µs/div
IOUT
1A/div
Figure 3. 4A Low-Dropout Circuit
Figure 5. Transient Response for a 200mA to 4A Load Step
Using Circuit of Figure 3
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