Rainbow Electronics MAX1790 - Manual

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or visit Maxim’s website at www.maxim-ic.com.
General Description
The MAX1790 boost converter incorporates high-perfor-
mance (at 1.2MHz), current-mode, fixed-frequency, pulse-
width modulation (PWM) circuitry with a built-in 0.21
Ω
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.
Applications
LCD Displays
PCMCIA Cards
Portable Applications
Hand-Held Devices
Features
♦ 90% Efficiency
♦ Adjustable Output from V
IN to 12V
♦ 1.6A, 0.21Ω, 14V Power MOSFET
♦ +2.6V to +5.5V Input Range
♦ Pin-Selectable 640kHz or 1.2MHz Switching
Frequency
♦ 0.1µA Shutdown Current
♦ Programmable Soft-Start
♦ Small 8-Pin µMAX Package
MAX1790
Low-Noise Step-Up DC-DC Converter
________________________________________________________________ Maxim Integrated Products 1
IN
LX GND
1
2
8
7
SS
FREQ FB
COMP
µMAX
TOP VIEW
3
4
6
5
MAX1790
SHDN
LX
IN
V IN
2.6V TO 5V
GND
FREQ
V OUT
COMP
SHDN
FB
MAX1790
ON/OFF
SS
Typical Operating Circuit
19-1563; Rev 0a; 1/00
PART
MAX1790EUA -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
8 µMAX
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Pin Configuration
Ordering Information