MAX1790 Maxim, MAX1790 Datasheet
MAX1790
Manufacturer Part Number
MAX1790
Description
Low-Noise Step-Up DC-DC Converter
Manufacturer
Maxim
Datasheet
1.MAX1790.pdf
(12 pages)
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The MAX1790 boost converter incorporates high-perfor-
mance (at 1.2MHz), current-mode, fixed-frequency, pulse-
width modulation (PWM) circuitry with a built-in 0.21Ω
N-channel MOSFET to provide a highly efficient regulator
with fast response.
High switching frequency (640kHz or 1.2MHz selectable)
allows easy filtering and faster loop performance. An
external compensation pin provides the user flexibility in
determining loop dynamics, allowing the use of small, low
equivalent series resistance (ESR) ceramic output capaci-
tors. The device can produce an output voltage as high as
12V from an input as low as 2.6V.
Soft-start is programmed with an external capacitor, which
sets the input current ramp rate. In shutdown mode, cur-
rent consumption is reduced to 0.1µA. The MAX1790 is
available in a space-saving 8-pin µMAX package. The
ultra-small package and high switching frequency allow
the total solution to be less than 1.1mm high.
19-1563; Rev 0; 1/00
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
V
2.6V TO 5V
IN
ON/OFF
LCD Displays
PCMCIA Cards
Portable Applications
Hand-Held Devices
Typical Operating Circuit
SHDN
FREQ
SS
________________________________________________________________ Maxim Integrated Products
MAX1790
COMP
IN
General Description
GND
LX
FB
Low-Noise Step-Up DC-DC Converter
Applications
V
OUT
o 90% Efficiency
o Adjustable Output from V
o 1.6A, 0.21Ω, 14V Power MOSFET
o +2.6V to +5.5V Input Range
o Pin-Selectable 640kHz or 1.2MHz Switching
o 0.1µA Shutdown Current
o Programmable Soft-Start
o Small 8-Pin µMAX Package
MAX1790EUA
Frequency
TOP VIEW
PART
COMP
SHDN
GND
FB
TEMP. RANGE
-40°C to +85°C
1
2
4
3
Ordering Information
MAX1790
µMAX
Pin Configuration
IN
to 12V
8
7
6
5
8 µMAX
PIN-PACKAGE
SS
FREQ
IN
LX
Features
1
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