MAX860MJA View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX860MJA Datasheet PDF : 11 Pages
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MAX860/MAX861
50mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit (Inverter), VDD = +5V, –S—H—D—N– = VDD, FC = LV = GND, C1 = C2 = 10µF (Note 2), TA = TMIN to TMAX, unless
otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Switching Frequency
(Note 5)
FC Current (from VDD)
SYMBOL
MAX860
fS
MAX861
IFC
FC < 4V
MAX860,
FC = VDD
CONDITIONS
FC = VDD
FC = GND
FC = OUT
FC = VDD
FC = GND
FC = OUT
RL = 2kΩ from VDD
to OUT
RL = 1kΩ from OUT
to GND
MIN TYP MAX UNITS
3
6
30
50
80
130
kHz
8
13
60
100
160
250
-2
-4
µA
93
96
90
93
Power Efficiency (Note 6)
MAX861,
RL = 2kΩ from VDD
to OUT
93
96
%
FC = VDD
RL = 1kΩ from OUT
to GND
88
92
MAX860/MAX861, FC = VDD,
IL = 50mA to GND, C1 = C2 = 68µF
87
Voltage-Conversion Efficiency
No load
99
99.9
%
–S—H—D—N– Threshold
Shutdown Supply Current
Time to Exit Shutdown
VIH
LV = GND
VIL
–S—H—D—N– < 0.3V
MAX86_I/E
MAX86_M
No load, VOUT = -4V
1.2
V
0.3
1
µA
10
500
µs
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
C1 and C2 are low-ESR (<0.2Ω) aluminum electrolytics. Capacitor ESR adds to the circuit’s output resistance. Using
capacitors with higher ESR may reduce output voltage and efficiency.
MAX860/MAX861 may draw high supply current during startup, up to the minimum operating supply voltage. To guaran-
tee proper startup, the input supply must be capable of delivering 90mA more than the maximum load current.
Specified output resistance includes the effect of the 0.2Ω ESR of the test circuit’s capacitors.
The switches are driven directly at the oscillator frequency, without any division.
At lowest frequencies, using 10µF capacitors gives worse efficiency figures than using the recommended capacitor
values in Table 3, due to larger 1 ⁄ (fs x C1) term in ROUT.
Maxim Integrated
3
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