MAX1673

IN .....................................................................-0.3V to +6V
CAP+, FB, LIN/SKIP................................-0.3V to (V_IN + 0.3V)
SHDN.................................................................-0.3V to +6V
OUT, CAP-..........................................................-6V to +0.3V
Continuous Output Current........................................135mA
Output Short-Circuit Duration to GND (Note 1) ..............1sec
Continuous Power Dissipation (T_A = +70°C)
(derate 5.88mW/°C above +70°C)..........................450mW
Operating Temperature Range ...................-40°C to +85°C
Junction Temperature................................................+150°C
Storage Temperature Range .....................-65°C to +160°C
Lead Temperature (soldering, 10sec) .......................+300°C
Note 1: Shorting OUT to IN may damage the device and should be avoided.

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The MAX1673 charge-pump inverter provides a lowcost,compact means of generating a regulated negative output from a positive input at up to 125mA. It requires only three small capacitors, and only two resistors to set its output voltage. The input range is 2V to 5.5V. The regulated output can be set from 0V to -V_IN in Skip regulation mode or -1.5V to -V_IN in Linear (L_IN) regulation mode.

In Skip mode, the MAX1673 regulates by varying its switching frequency as a function of load current. This On-Demand™ switching gives the MAX1673 two advantages: very small capacitors and very low quiescent supply current. At heavy loads, it transfers energy from the input to the output by switching at up to 350kHz. It switches more slowly at light loads, using only 35A quiescent supply current.In Linear mode, the MAX1673 switches at a constant 350kHz at all loads and regulates by controlling the current-path resistance. This provides constantfrequency ripple, which is easily filtered for low-noise applications.

This device also features a 1A logic-controlled shutdown mode and is available in a standard 8-pin SO package. For a device that delivers about 10mA and fits in a smaller package, refer to the MAX868.