Pin description, Typical operating characteristics (continued) – Rainbow Electronics MAX871 User Manual
Page 4
_____________________Pin Description
MAX870/MAX871
Switched-Capacitor Voltage Inverters
4
_______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= +5V, C1 = C2 = C3, T
A
= +25°C, unless otherwise noted.)
0
20
10
40
30
60
50
70
90
80
100
0
10 15 20
5
25 30 35
45
40
50
MAX870
EFFICIENCY vs. OUTPUT CURRENT
MAX870/71-TOC10
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
IN
= 2.0V
V
IN
= 3.3V
V
IN
= 5.0V
0
20
10
50
40
30
80
70
60
90
0
15
20
5
10
25
30
35
40
MAX871
EFFICIENCY vs. OUTPUT CURRENT
MAX870/71 TOC11
OUTPUT CURRENT (mA)
EFFICIENCY (%)
V
IN
= 2.0V
V
IN
= 3.3V
V
IN
= 5.0V
100
250
200
150
300
350
400
450
500
550
600
-40
10
-15
35
60
85
PUMP FREQUENCY vs. TEMPERATURE
MAX870/71-TOC12
TEMPERATURE (°C)
PUMP FREQUENCY (kHz)
V
IN
= 1.5V, MAX871
V
IN
= 1.5V, MAX870
V
IN
= 3.3V OR 5.0V, MAX870
V
IN
= 3.3V OR 5.0V, MAX871
MAX870
OUTPUT NOISE AND RIPPLE
MAX870/71-TCC13
2
µ
s/div
V
IN
= 3.3V, V
OUT
= -3.18V, I
OUT
= 5mA,
20mV/div, AC COUPLED
Flying Capacitor’s Positive Terminal
C1+
5
Ground
GND
4
Flying Capacitor’s Negative Terminal
C1-
3
PIN
Positive Power-Supply Input
IN
2
Inverting Charge-Pump Output
OUT
1
FUNCTION
NAME
VOLTAGE INVERTER
OUT
IN
C1+
V
IN
R
L
C1
0.33
µ
F*
*1
µ
F
(MAX870)
C2
0.33
µ
F*
C3
0.33
µ
F*
5
1
2
3
4
V
OUT
GND
C1-
MAX870
MAX871
Figure 1. Test Circuit
MAX871
OUTPUT NOISE AND RIPPLE
MAX870/71-TCC14
1
µ
s/div
V
IN
= 3.3V, V
OUT
= -3.14V, I
OUT
= 5mA,
20mV/div, AC COUPLED