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Part Number: MAX1673
Description: The MAX1673 charge-pump inverter provides a lowcost,compact means of generating a regulated negative o...
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MAX1673
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DataSheet
General Description
MAX1673 General Description
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 -VIN in Skip regulation mode or -1.5V to -VIN in Linear (LIN) 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.
MAX1673 Maximum Ratings
IN .....................................................................-0.3V to +6V
CAP+, FB, LIN/SKIP................................-0.3V to (VIN + 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 (TA = +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.
MAX1673 Features
` Regulated Negative Output Voltage (up to -1 x VIN)
` 125mA Output Current
` 35A Quiescent Supply Current (Skip-mode regulation)
` 350kHz Fixed-Frequency, Low-Noise Output (Linear-mode regulation)
` 2V to 5.5V Input Range
` 1A Logic-Controlled Shutdown
` 125mA Output Current
` 35A Quiescent Supply Current (Skip-mode regulation)
` 350kHz Fixed-Frequency, Low-Noise Output (Linear-mode regulation)
` 2V to 5.5V Input Range
` 1A Logic-Controlled Shutdown
MAX1673 Typical Application
Hard Disk Drives
Measurement Instruments
Camcorders
Modems
Analog Signal-Processing
Digital Cameras
Applications
Measurement Instruments
Camcorders
Modems
Analog Signal-Processing
Digital Cameras
Applications
MAX1673 Connection Diagram
MAX1673
PDF/DataSheet Download
- Datasheet: MAX1673
- File Size: 89514 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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The MAX1672 evaluation kit (EV kit) integrates a stepup switching converter with a linear-regulator output to provide step-up/down voltage conversion. It accepts a 1.8V to 11V input and converts it to a 3.3V or 5V output for currents up to 300mA. The EV kit ...
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