MAX868EUB 데이터 시트보기 (PDF) - Maxim Integrated
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MAX868EUB Datasheet PDF : 12 Pages
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Regulated, Adjustable -2x
Inverting Charge Pump
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 5, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(VIN = 5V)
80
70
60
VOUT = -7.5V
EFFICIENCY vs. LOAD CURRENT
(VIN = 3.3V)
80
70
VOUT = -5V
60
EFFICIENCY vs. LOAD CURRENT
(VIN = 5V)
80
CIRCUIT OF FIGURE 6
70
VOUT = -3.3V
60
50
50
40
VOUT = -5V
40
50
VOUT = -3.3V
40
VOUT = -2.5V
30
30
30
VOUT = -3.3V
20
20
20
10
10
10
0
0.01
0.1
1
10
100
LOAD CURRENT (mA)
OPEN-LOOP OUTPUT IMPEDANCE
vs. TEMPERATURE
(FB = IN, VOUT = -2 x VIN)
200
180
160
140
120
VIN = 2V
100
VIN = 3.3V
80
60
40
VIN = 5V
20
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
0
0.01
0.1
1
10
100
LOAD CURRENT (mA)
OPEN-LOOP OUTPUT IMPEDANCE
vs. TEMPERATURE
(FB = IN, VOUT = -VIN)
200
CIRCUIT OF FIGURE 6
180
160
140
120
100
VIN = 2V
80
60
VIN = 3.3V
40
20
0
-40 -20
VIN = 5V
0 20 40 60 80 100
TEMPERATURE (°C)
0
0.01
0.1
1
10
100
LOAD CURRENT (mA)
LOAD-TRANSIENT RESPONSE
10mA/div
20mV/div
200µs/div
VIN = 5V, VOUT = -5V, IOUT = 1mA TO 11mA STEP
OUTPUT VOLTAGE RIPPLE
(COUT = 10µF TANTALUM)
OUTPUT VOLTAGE RIPPLE
(COUT = 10µF CERAMIC)
OUTPUT VOLTAGE RIPPLE
20mV/div
20mV/div
20mV/div
20µs/div
VIN = 3.3V, VOUT = -3.3V, ILOAD = 5mA,
VOUT AC COUPLED (20mV/div), COUT = 10µF (AVX TPS)
20µs/div
VIN = 3.3V, VOUT = -3.3V, ILOAD = 5mA,
VOUT AC COUPLED (20mV/div), COUT = 10µF CERAMIC
20µs/div
VIN = 3.3V, VOUT = -3.3V, ILOAD = 5mA,
VOUT AC COUPLED (20mV/div), COUT = 2.2µF CERAMIC
4 _______________________________________________________________________________________
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