19-1660; Rev 2; 1/04
0.8A, Low-Noise, 1MHz,
Step-Up DC-DC Converter
General Description
Features
♦ Up to 94% Efficiency
♦ 0.7V to 5.5V Input Range
The MAX1760/MAX1760H are high-efficiency, low-noise,
step-up DC-DC converters intended for use in battery-
powered wireless applications. They combine low quies-
cent supply current (100µA) with a high 1MHz operating
frequency. Small external components and tiny 10-pin
TDFN and µMAX packages make this device an excel-
lent choice for small hand-held applications. The
MAX1760 is activated by a logic-low ON signal while the
MAX1760H is activated by a logic-high ON input.
♦ Up to 800mA Output
♦ Fixed 3.3V Output (or Adjustable from 2.5V to 5.5V)
♦ PWM Synchronous-Rectified Topology
♦ Low-Noise, Constant-Frequency Operation (1MHz)
♦ 0.1µA Logic-Controlled Shutdown
♦ Synchronizable Switching Frequency
♦ Adjustable Current Limit
Both devices use a synchronous-rectified pulse-width-
modulation (PWM) boost topology to generate 2.5V to
5.5V outputs from a wide range of inputs, such as 1 to 3
alkaline or NiCd/NiMH cells or a single lithium-ion (Li+)
cell. Proprietary Idle-Mode™ circuitry significantly
improves light-load efficiency and smoothly transitions to
fixed-frequency PWM operation at higher load currents.
♦ Adjustable Soft-Start
♦ 10-Pin µMAX Package
Low-noise, forced-PWM mode is available for applica-
tions requiring constant-frequency operation at all load
currents. PWM operation can 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.
♦ 10-Pin 3mm x 3mm TDFN Package
Ordering Information
ON
LOGIC
PART
TEMP RANGE PIN-PACKAGE
MAX1760ETB
-40°C to +85°C
-40°C to +85°C
10 TDFN
10 µMAX
10 TDFN
10 µMAX
Low
Low
High
High
Applications
PCS Phones
MAX1760EUB
Digital Cordless Phones
Wireless Handsets
Palmtop Computers
Two-Way Pagers
MAX1760HETB -40°C to +85°C
MAX1760HEUB -40°C to +85°C
Hand-Held Instruments
Personal Communicators
Typical Operating Circuit
Pin Configurations
INPUT = 0.7V
TO V
TOP VIEW
OUT
MAX1760
ISET
REF
GND
FB
1
2
3
4
5
10 ON (ON)
ISET
1
2
3
4
5
10 ON (ON)
ON
LX
9
8
7
6
POUT
LX
REF
GND
FB
9
8
7
6
POUT
LX
V
= 3.3V,
OUT
CLK/SEL
POUT
MAX1760
MAX1760H
MAX1760
MAX1760H
800mA
PGND
CLK/SEL
PGND
CLK/SEL
ISET
REF
FB
OUT
OUT
OUT
µMAX
TDFN
(3mm x 3mm)
GND PGND
(ON) FOR MAX1760H
Idle Mode is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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.