MAX1795 Maxim, MAX1795 Datasheet
MAX1795
Manufacturer Part Number
MAX1795
Description
Low Supply Current / Step-Up DC-DC Converters with True-Shutdown
Manufacturer
Maxim
Datasheet
1.MAX1795.pdf
(13 pages)
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The MAX1795/MAX1796/MAX1797 are high efficiency
step-up DC-DC converters intended for small portable
hand-held devices. These devices feature Maxim’s
True-Shutdown™ circuitry, which fully disconnects the
output from the input in shutdown, improves efficiency,
and eliminates costly external components. All three
devices also feature Maxim’s proprietary LX-damping
circuitry for reduced EMI in noise-sensitive applica-
tions. For additional in-system flexibility, a battery moni-
toring comparator (LBI/LBO) remains active even when
the DC-DC converter is in shutdown.
The input voltage range is +0.7V to V
can be set from +2V to +5.5V. Startup is guaranteed
from +0.85V. The MAX1795/MAX1796/MAX1797 have a
preset, pin-selectable 5V or 3.3V output. The output
can also be adjusted to other voltages, using two exter-
nal resistors. The three devices differ only in their cur-
rent limits, allowing optimization of external components
for different loads: The MAX1795, MAX1796, and
MAX1797 have current limits of 0.25A, 0.5A, and 1A,
respectively. All devices are packaged in a compact 8-
pin µMAX package that is only 1.09mm tall and half the
size of an 8-pin SO.
19-1798; Rev 0; 12/00
________________________Applications
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Low Supply Current, Step-Up DC-DC Converters
Portable Digital Audio Players
PDAs/Palmtops
Wireless Handsets
Portable Terminals
TOP VIEW
SHDN
LBO
LBI
FB
________________________________________________________________ Maxim Integrated Products
1
2
3
4
General Description
MAX1795
MAX1796
MAX1797
µMAX
Pin Configuration
8
7
6
5
OUT
BATT
OUT
LX
GND
, where V
OUT
o >95% Efficiency
o True-Shutdown Circuitry
o 25µA Quiescent Supply Current
o Low-Noise Antiringing Feature
o LBI/LBO Comparator Enabled in Shutdown
o 2µA Shutdown Current
o 8-Pin µMAX Package
True-Shutdown is a trademark of Maxim Integrated Products.
MAX1795 EUA
MAX1796 EUA
MAX1797 EUA
Output Disconnects from Input in Shutdown
No External Schottky Diode Needed
0.7V TO
PART
with True-Shutdown
5.5V
IN
OFF
ON
Typical Operating Circuit
BATT
LBI
LBO
SHDN
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Ordering Information
MAX1795
MAX1796
MAX1797
GND
OUT
LX
FB
PIN-PACKAGE
8 µMAX
8 µMAX
8 µMAX
Features
OUT
1
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