MAX629 Maxim, MAX629 Datasheet
MAX629
Manufacturer Part Number
MAX629
Description
28V / Low-Power / High-Voltage / Boost or Inverting DC-DC Converter
Manufacturer
Maxim
Datasheet
1.MAX629.pdf
(12 pages)
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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 neg-
ative bias voltages up to ±28V from input voltages in
the 0.8V to V
boost, flyback, and SEPIC topologies.
The MAX629’s current-limited pulse-frequency-modula-
tion (PFM) control scheme provides high efficiency over
a wide range of load conditions. An internal, 0.5A N-
channel 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, logic-
controlled shutdown, small package, and tiny external
components makes it an extremely compact and effi-
cient high-voltage biasing solution that’s ideal for bat-
tery-powered applications. The MAX629 is available in
an 8-pin SO package.
________________________Applications
19-1219; Rev 1; 6/97
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
___________________________________________________Typical Operating Circuit
_______________General Description
TO +5.5V
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
+2.7V
V
IN
OUT
POSITIVE OUTPUT VOLTAGE
________________________________________________________________ Maxim Integrated Products
POL
SHDN
ISET
REF
range, and can be configured for
MAX629
GND
V
CC
Boost or Inverting DC-DC Converter
LX
FB
28V, Low-Power, High-Voltage,
V
28V
OUT
TO +5.5V
+2.7V
V
IN
____________________________Features
* Dice are tested at T
Note: To order tape-and-reel shipping, add “-T” to the end of
the part number.
Pin Configuration appears at end of data sheet.
______________Ordering Information
MAX629C/D
MAX629ESA
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
PART
NEGATIVE OUTPUT VOLTAGE
SHDN
ISET
POL
MAX629
GND
V
A
CC
TEMP. RANGE
-40°C to +85°C
= +25°C, DC parameters only.
0°C to +70°C
REF
LX
FB
Dice*
8 SO
PIN-PACKAGE
-V
-28V
OUT
1
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