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MFG:MAXIM  Package Cooled:SMD  D/C:06+  

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Part Number: MAX629

 

MFG: MAXIM

Package Cooled: SMD

D/C: 06+

Description: The MAX629 low-power DC-DC converter features an internal N-channel MOSFET switch and programmable cur...


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MAX629 General Description


The MAX629 low-power DC-DC converter features an internal N-channel MOSFET switch and programmable current limiting. It is designed to supply positive or negative bias voltages up to ±28V from input voltages in the 0.8V to VOUT range, and can be configured for boost, flyback, and SEPIC topologies.

The MAX629's current-limited pulse-frequency-modulation (PFM) control scheme provides high efficiency over a wide range of load conditions. An internal, 0.5A Nchannel MOSFET switch reduces the total part count, and a high switching frequency (up to 300kHz) allows for tiny surface-mount magnetics.

The MAX629's combination of low supply current, logiccontrolled shutdown, small package, and tiny external components makes it an extremely compact and efficient high-voltage biasing solution that's ideal for battery- powered applications. The MAX629 is available in an 8-pin SO package.

MAX629 Maximum Ratings

Supply Voltage (VCC to GND) ..................................-0.3V to +6V
SHDN to GND...........................................................-0.3V to +6V
ISET, REF, FB, POL to GND .........................-0.3V to (VCC + 0.3V)
LX to GND .............................................................-0.3V to +30V
Continuous Power Dissipation (TA = +70°C)
SO (derate 5.88mW/°C above +70°C)..........................471mW
Operating Temperature Range ........................-40°C to +85°C
Junction Temperature.....................................................+150°C
Storage Temperature Range .........................-65°C to +165°C
Lead Temperature (soldering, 10sec) ...........................+300°C

MAX629 Features

 Internal, 500mA, 28V N-Channel Switch (No External FET Required)
Generates Positive or Negative Output Voltages
80µA Supply Current
1µA Max Shutdown Current
Up to 300kHz Switching Frequency
Adjustable Current Limit Allows Use of Small, Inexpensive Inductors
 8-Pin SO Package

MAX629 Typical Application

Positive or Negative LCD Bias Generators
High-Efficiency DC-DC Boost Converters
Varactor Tuning Diode Bias
Palmtop Computers
2-Cell and 3-Cell Battery-Powered Applications

MAX629 Connection Diagram

MAX629 Connection Diagram

MAX629 datasheet

MAX629
PDF/DataSheet Download

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