MAX861(1996) 查看數據表（PDF） - Maxim Integrated

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MAX861
(Rev.:1996)

50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters

Maxim Integrated 

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 4)

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 5)

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:

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.

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.

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