MAX1680C 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1680C

125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters

Maxim Integrated 

125mA, Frequency-Selectable,

Switched-Capacitor Voltage Converters

+VINPUT

FSEL

IN

1µF

CAP+ SHDN

1µF

MAX1681

1µF

GND

LV

CAP-

OUT

NOTE: USE 4.7µF CAPACITORS FOR MAX1680.

VOUT = -VINPUT

ROUT = ROUT OF SINGLE DEVICE

NUMBER OF DEVICES (n)

Figure 2. Paralleling MAX1680/MAX1681s to Increase Output Current

FSEL

IN

CAP+ SHDN

MAX1681

GND

LV

"n"

CAP-

OUT

1µF

VOUT

1µF

Combined Doubler and Inverter

Figure 3 shows a single MAX1680/MAX1681 as an

inverter and a doubler. The maximum output current is

the sum of the loads on the two outputs and is still limit-

ed to 125mA. As the device is loaded, the output volt-

ages move toward ground. In this particular

configuration, connect LV to GND (inverter). The diodes

used in the circuit cause a drop of approximately 0.7V

in the doubler’s output voltage, impacting efficiency.

Compatibility with the MAX660 and

MAX860/MAX861

The MAX1680/MAX1681 can be used in place of the

MAX860/MAX861, except for the SHDN and FSEL pins.

The MAX1680/MAX1681 shut down with a high input

voltage, compared with the MAX860/MAX861. The

MAX1680/MAX1681 have only two frequency choices.

Replacing the MAX660 with the MAX1680/MAX1681

involves a wiring change, as the external oscillator pin

is replaced by the shutdown feature. Table 5 compares

the devices.

+VINPUT

FSEL

CAP+

IN

1µF

SHDN

D1

IN4148

MAX1681

1µF GND

LV

CAP-

OUT

1µF

D2

IN4148

NOTE: USE 4.7µF CAPACITORS FOR MAX1680.

VOUT = -VINPUT

1µF

VOUT = 2VINPUT

1µF

-VFD1

-VFD2

Figure 3. Combined Doubler and Inverter

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