MAX871 MAXIM [Maxim Integrated Products], MAX871 Datasheet - Page 4

• Manufacturer Part Number: MAX871
• Description: Switched-Capacitor Voltage Inverters
• Manufacturer: MAXIM [Maxim Integrated Products]

_____________________Pin Description
Switched-Capacitor Voltage Inverters
4
(Circuit of Figure 1, V
____________________________Typical Operating Characteristics (continued)
100
PIN
90
80
70
60
50
40
30
20
10
1
_______________________________________________________________________________________
0
2
3
4
5
0
EFFICIENCY vs. OUTPUT CURRENT
5
NAME
GND
10 15 20
OUT
C1+
C1-
V
IN
IN
V
20mV/div, AC COUPLED
OUTPUT CURRENT (mA)
IN
= 2.0V
= 3.3V, V
MAX870
OUTPUT NOISE AND RIPPLE
IN
V
25 30 35
OUT
Inverting Charge-Pump Output
Positive Power-Supply Input
Flying Capacitor’s Negative Terminal
Ground
Flying Capacitor’s Positive Terminal
IN
= +5V, C1 = C2 = C3, T
= 3.3V
= -3.18V, I
MAX870
2 s/div
V
40
IN
OUT
= 5.0V
45
FUNCTION
= 5mA,
50
90
80
70
60
50
40
30
20
10
A
0
= +25°C, unless otherwise noted.)
0
EFFICIENCY vs. OUTPUT CURRENT
5
V
10
IN
OUTPUT CURRENT (mA)
= 2.0V
15
MAX871
20
Figure 1. Test Circuit
25
V
IN
= 3.3V
*1 F
30
(MAX870)
V
IN
= 5.0V
35
40
1
2
V
20mV/div, AC COUPLED
3
IN
VOLTAGE INVERTER
C1-
= 3.3V, V
OUT
IN
600
550
500
450
400
350
300
250
200
150
100
OUTPUT NOISE AND RIPPLE
MAX870
MAX871
OUT
-40
PUMP FREQUENCY vs. TEMPERATURE
V
V
= -3.14V, I
0.33 F*
IN
IN
GND
C1+
MAX871
= 1.5V, MAX871
= 1.5V, MAX870
1 s/div
C3
-15
5
4
OUT
TEMPERATURE (°C)
V
V
IN
= 5mA,
IN
C2
0.33 F*
10
= 3.3V OR 5.0V, MAX870
= 3.3V OR 5.0V, MAX871
35
R
L
C1
0.33 F*
V
V
OUT
IN
60
85