MAX764C データシートの表示（PDF） - Maxim Integrated
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MAX764C Datasheet PDF : 12 Pages
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-5V/-12V/-15V or Adjustable,
High-Efficiency, Low IQ DC-DC Inverters
____________________________Typical Operating Characteristics (continued)
(V+ = 5V, VOUT = -5V, TA = +25°C, unless otherwise noted.)
DISCONTINUOUS CONDUCTION AT
HALF CURRENT LIMIT
CONTINUOUS CONDUCTION AT
FULL CURRENT LIMIT
A
A
B
B
0A
0A
0V
C
0V
C
5µs/div
CIRCUIT OF FIGURE 2, V+ = 5V, VOUT = -5V, ILOAD = 80mA
A: OUTPUT RIPPLE, 100mV/div
B: INDUCTOR CURRENT, 500mA/div
C: LX WAVEFORM, 10V/div
5µs/div
CIRCUIT OF FIGURE 2, V+ = 5V, VOUT = -5V, ILOAD = 240mA
A: OUTPUT RIPPLE, 100mV/div
B: INDUCTOR CURRENT, 500mA/div
C: LX WAVEFORM, 10V/div
______________________________________________________________Pin Description
PIN NAME
FUNCTION
1
OUT
Sense Input for Fixed-Output Operation (VFB = VREF). OUT must be connected to VOUT.
2
FB
Feedback Input. Connect FB to REF to use the internal voltage divider for a preset output. For adjustable-
output operation, use an external voltage divider, as described in the section Setting the Output Voltage.
3
SHDN
Active-High Shutdown Input. With SHDN high, the part is in shutdown mode and the supply current is less
than 5µA. Connect to ground for normal operation.
4
REF
1.5V Reference Output that can source 100µA for external loads. Bypass to ground with a 0.1µF capacitor.
5
GND Ground
6, 7
V+
Positive Power-Supply Input. Must be tied together. Place a 0.1µF input bypass capacitor as close to
the V+ and GND pins as possible.
8
LX
Drain of the Internal P-Channel Power MOSFET. LX has a peak current limit of 0.75A.
_______________________________________________________________________________________ 7
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