MAX870EUK/D Ver la hoja de datos (PDF) - Maxim Integrated
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MAX870EUK/D Datasheet PDF : 8 Pages
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Switched-Capacitor Voltage Inverters
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = +5V, C1 = C2 = C3, TA = +25°C, unless otherwise noted.)
MAX870
EFFICIENCY vs. OUTPUT CURRENT
100
90
80
70
VIN = 3.3V VIN = 5.0V
60
VIN = 2.0V
50
40
30
20
MAX871
EFFICIENCY vs. OUTPUT CURRENT
90
VIN = 5.0V
80
70
60
VIN = 2.0V
VIN = 3.3V
50
40
30
20
PUMP FREQUENCY vs. TEMPERATURE
600
550
VIN = 3.3V OR 5.0V, MAX871
500
450 VIN = 1.5V, MAX871
400
350
300 VIN = 1.5V, MAX870
250
VIN = 3.3V OR 5.0V, MAX870
200
10
10
150
0
0 5 10 15 20 25 30 35 40 45 50
OUTPUT CURRENT (mA)
0
0
5 10 15 20 25 30 35 40
OUTPUT CURRENT (mA)
100
-40 -15
10
35
60
85
TEMPERATURE (°C)
MAX870
OUTPUT NOISE AND RIPPLE
MAX871
OUTPUT NOISE AND RIPPLE
2µs/div
VIN = 3.3V, VOUT = -3.18V, IOUT = 5mA,
20mV/div, AC COUPLED
1µs/div
VIN = 3.3V, VOUT = -3.14V, IOUT = 5mA,
20mV/div, AC COUPLED
_____________________Pin Description
PIN NAME
FUNCTION
1
OUT
Inverting Charge-Pump Output
2
IN
Positive Power-Supply Input
3
C1-
Flying Capacitor’s Negative Terminal
4
GND Ground
5
C1+
Flying Capacitor’s Positive Terminal
C3
0.33µF*
1
OUT
C1+ 5
2 IN MAX870
MAX871
3
C1-
GND 4
VIN
RL
VOUT
C2
0.33µF*
C1
0.33µF*
*1µF
(MAX870)
VOLTAGE INVERTER
Figure 1. Test Circuit
4 _______________________________________________________________________________________
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