MAX1760 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter

19-1660; Rev 1; 1/01
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0.8A, Low-Noise, 1MHz,
Step-Up DC-DC Converter
General Description
The MAX1760 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. It maintains exceptionally low qui-
escent supply current (100µA) despite its high 1MHz
operating frequency. Small external components and a
tiny 10-pin µMAX package make this device an excel-
lent choice for small hand-held applications requiring
the longest possible battery life.
The MAX1760 uses a synchronous-rectified pulse-
width-modulation (PWM) boost topology to generate
2.5V to 5.5V outputs from a wide range of input
sources, such as 1 to 3 alkaline or NiCd/NiMH cells or a
single lithium-ion (Li+) cell. Maxim's proprietary Idle-
Mode™ circuitry significantly improves efficiency at
light load currents while smoothly transitioning to fixed-
frequency PWM operation at higher load currents to
maintain excellent full-load efficiency.
Low-noise, forced PWM mode is available for applica-
tions requiring constant-frequency operation at all load
currents. The MAX1760 may also be synchronized to
an external clock to protect sensitive frequency bands
in communications equipment. Analog soft-start and
adjustable current limit permit optimization of efficiency,
external component size, and output voltage ripple.
Digital Cordless Phones
Wireless Handsets
Palmtop Computers
Two-Way Pagers
Applications
PCS Phones
Hand-Held Instruments
Personal Communicators
Features
o Up to 94% Efficiency
o 0.7V to 5.5V Input Range
o Up to 800mA Output
o Fixed 3.3V Output (or adj from 2.5V to 5.5V)
o PWM Synchronous Rectified Topology
o Low-Noise, Constant Frequency Operation (1MHz)
o 0.1µA Logic-Controlled Shutdown
o Synchronizable Switching Frequency
o Adjustable Current Limit
o Adjustable Soft-Start
o 10-Pin µMAX Package
PART
MAX1760EUB
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
10 µMAX
INPUT = 0.7V
TO VOUT
Typical Operating Circuit
TOP VIEW
Pin Configuration
MAX1760
ON
LX
CLK/SEL
POUT
ISET
REF
OUT
FB GND PGND
VOUT = 3.3V,
800mA
ISET 1
REF 2
GND 3
FB 4
OUT 5
MAX1760
µMAX
10 ON
9 POUT
8 LX
7 PGND
6 CLK/SEL
Idle Mode is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.