MAX1760_07 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter

19-1660; Rev 3; 1/07
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0.8A, Low-Noise, 1MHz,
Step-Up DC-DC Converter
General Description
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.
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.
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.
Applications
Digital Cordless Phones
Wireless Handsets
Palmtop Computers
Two-Way Pagers
PCS Phones
Handheld Instruments
Personal Communicators
Typical Operating Circuit
Features
♦ Up to 94% Efficiency
♦ 0.7V to 5.5V Input Range
♦ 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
♦ Adjustable Soft-Start
♦ 10-Pin µMAX Package
♦ 10-Pin 3mm x 3mm TDFN Package
Ordering Information
PART
PIN-
PACKAGE
ON
LOGIC
PKG CODE
MAX1760ETB 10 TDFN-EP*
Low
MAX1760EUB 10 µMAX
Low
T1033-1
U10-2
MAX1760HETB 10 TDFN-EP*
High
T1033-1
MAX1760HEUB 10 µMAX
High
U10-2
*EP = Exposed paddle.
Note: All devices are specified over the -40°C to +85°C operating
temperature range.
Pin Configurations
INPUT = 0.7V
TO V_OUT
MAX1760
ON
LX
CLK/SEL
POUT
ISET
REF
OUT
FB GND PGND
TOP VIEW
V_OUT = 3.3V,
800mA
ISET 1
REF 2
GND 3
FB 4
OUT 5
MAX1760
MAX1760H
µMAX
(ON) FOR MAX1760H
10 ON (ON) ISET 1
9 POUT REF 2
8 LX
GND 3
7 PGND
FB 4
6 CLK/SEL OUT 5
MAX1760
MAX1760H
10 ON (ON)
9 POUT
8 LX
7 PGND
6 CLK/SEL
TDFN
(3mm x 3mm)
µMAX is a registered trademark of Maxim Integrated Products, Inc.
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.