MAX1964 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX1964 Datasheet PDF : 30 Pages
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Tracking/Sequencing Triple/Quintuple
Power-Supply Controllers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 12V, VOUT = 3.3V, TA = +25°C, unless otherwise noted.)
MAX1965 STARTUP WAVEFORM
(VOLTAGE TRACKING)
MAX1964/65 toc10
A
4V
B
2V
C
D
0
-2V
-4V
E
5V
F
0
400µs/div
A. VOUT4 = 5.0V, 2V/div
D. VOUT3 = 1.8V/div
B. VOUT1 = 3.3V, 2V/div
E. VOUT5 = -5.0V, 2V/div
C. VOUT2 = 2.5V, 2V/div
F. VPOK, 5V/div
VIN = STEPPED FROM 0 TO 12V,
ROUT1 = 6.6Ω
CIRCUIT OF FIGURE 6
POSITIVE LINEAR REGULATOR BASE-
DRIVE CURRENT vs. BASE-DRIVE VOLTAGE
40
35
VFB_ = 1.0V
30
25
20
VFB_ = 0.96VREF
15
10
5
B2, B3 AND B4
(MAX1965) ONLY
0
0
2
4
6
8
10
BASE VOLTAGE (V)
POSITIVE LINEAR REGULATOR
OUTPUT VOLTAGE vs. LOAD CURRENT
(QLDO = 2N3905)
2.50
2.48
VSUP(POS) = 5.0V
2.46
VSUP(POS) = 3.3V
2.44
2.42
0.01
0.1
1
10 100 1000
LOAD CURRENT (mA)
POSITIVE LINEAR REGULATOR
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
(QLDO = 2N3905)
2.50
2.48
IOUT2 = 1mA
2.46
IOUT2 = 100mA
2.44
2.42
2345678
SUPPLY VOLTAGE (V)
POSITIVE LINEAR REGULATOR
POWER-SUPPLY REJECTION RATIO
(QLDO = 2N3905)
80
70
60
50
40
30
20
IOUT2 = 50mA
10
0
0.1
1
10
100
1000
FREQUENCY (kHz)
100mA
0
POSITIVE LINEAR REGULATOR
LOAD TRANSIENT
(QLDO = 2N3905)
MAX1964/65 toc15
A
2.467V
B
2.457V
10µs/div
A. IOUTZ = 1mA TO 100mA, 50mA/div
B. VOUTZ = 2.5V, 5mV/div
CLDO(POS) = 10µF CERAMIC, VSUP(POS) = 3.3V
CIRCUIT OF FIGURE 1
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