MAX860 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX860 Datasheet PDF : 11 Pages
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MAX860/MAX861
50mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
____________________________Typical Operating Characteristics (continued)
(All curves generated using the inverter circuit shown in the Typical Operating Circuits with LV = GND and TA = +25°C, unless other-
wise noted. Test results also valid for doubler mode with LV = OUT and TA = +25°C. All capacitor values used are those recom-
mended in Table 3, unless otherwise noted. The output resistance curves represent the resistance of the device itself, which is RO in
the equation for ROUT shown in the Capacitor Selection section.)
MAX861
OUTPUT CURRENT vs. CAPACITANCE
HIGH-FREQUENCY MODE
90
fOSC = 250kHz
80 FC = OUT
70
LV = GND
INVERTER MODE
60
VIN = +4.5V,
VOUT = -3.5V
50
40
VIN = +4.5V, VOUT = -4V
30
VIN = +3V, VOUT = -2.4V
20
10
VIN = +3V, VOUT = -2.7V
0
0.33 1
2.2
4.7 10
22
CAPACITANCE (μF)
MAX861
OUTPUT CURRENT vs. CAPACITANCE
MEDIUM-FREQUENCY MODE
80
fOSC = 100kHz
70 FC = GND
LV = GND
60 INVERTER MODE
VIN = +4.5V,
VOUT = -3.5V
50
VIN = +3V,
40
VOUT = -2.4V
30
VIN = +4.5V,
VOUT = -4V
20
10
VIN = +3V, VOUT = -2.7V
0
0.33 1
2.2
4.7 10
22
CAPACITANCE (μF)
______________________________________________________________Pin Description
PIN NAME
INVERTER
FUNCTION
DOUBLER
1
FC
Frequency Control, see Table 1
Frequency Control, see Table 1
2
C1+
Flying-Capacitor Positive Terminal
Flying-Capacitor Positive Terminal
3
GND Ground
Positive Input Supply
4
C1-
Flying-Capacitor Negative Terminal
Flying-Capacitor Negative Terminal
5
OUT Negative Output
Ground
6
LV
Low-Voltage-Operation Input. Connect to GND.
Low-Voltage-Operation Input. Connect to OUT.
7
–S—H—D—N–
Active-Low Shutdown Input. Connect to VDD if not
Active-Low Shutdown Input. Connect to GND pin if not
used. Connect to GND to disable the charge pump. used. Connect to OUT to disable the charge pump.
8
VDD
Positive Input Supply
Doubled Positive Output
Maxim Integrated
5
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