MAX765CSLASHD datasheet(7/12 Pages) MAXIM

7 / 12 page

-5V/-12V/-15V or Adjustable,

High-Efficiency, Low IQ DC-DC Inverters

_______________________________________________________________________________________

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

µs/div

DISCONTINUOUS CONDUCTION AT

HALF CURRENT LIMIT

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

µs/div

CONTINUOUS CONDUCTION AT

FULL CURRENT LIMIT

______________________________________________________________Pin Description

Ground

GND

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.

V+

6, 7

Drain of the Internal P-Channel Power MOSFET. LX has a peak current limit of 0.75A.

1.5V Reference Output that can source 100µA for external loads. Bypass to ground with a 0.1µF capacitor.

REF

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.

SHDN

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.

Sense Input for Fixed-Output Operation (VFB = VREF). OUT must be connected to VOUT.

OUT

FUNCTION

NAME

____________________________Typical Operating Characteristics (continued)

(V+ = 5V, VOUT = -5V, TA = +25°C, unless otherwise noted.)

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