Datasheet

_____________________Pin Description
MAX828/MAX829
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.)
0.5
-5.5
05 1510 35
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
-4.5
-0.5
MAX828/829-10
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
20 3025 45 5040
-1.5
-2.5
-3.5
V
IN
= 3.3V
V
IN
= 5.0V
V
IN
= 2.0V
100
0
0510
EFFICIENCY vs. OUTPUT CURRENT
10
30
20
90
MAX828/829-11
OUTPUT CURRENT (mA)
EFFICIENCY (%)
2015 3025 4540 5035
70
80
50
60
40
V
IN
= 2.0V
V
IN
= 3.3V
V
IN
= 5.0V
V
OUT
20mV/div
MAX828
OUTPUT NOISE AND RIPPLE
MAX828/829-12
V
IN
= 3.3V, V
OUT
= -3.2V, I
OUT
= 5mA, AC COUPLED
20µs/div
Flying Capacitor’s Positive TerminalC1+5
GroundGND4
Flying Capacitor’s Negative TerminalC1-3
PIN
Positive Power-Supply InputIN2
Inverting Charge-Pump OutputOUT
1
FUNCTIONNAME
VOLTAGE INVERTER
OUT
IN
C1+
V
IN
R
L
C1
3.3µF*
*10µF
(MAX828)
C2
3.3µF*
C3
3.3µF*
5
1
2
3
4
V
OUT
GNDC1-
MAX828
MAX829
Figure 1. Test Circuit
V
OUT
20mV/div
MAX829
OUTPUT NOISE AND RIPPLE
MAX828/829-13
V
IN
= 3.3V, V
OUT
= -3.2V, I
OUT
= 5mA, AC COUPLED
10µs/div