MAX1763 Maxim, MAX1763 Datasheet
MAX1763
Manufacturer Part Number
MAX1763
Description
1.5A / Low-Noise / 1MHz / Step-Up DC-DC Converter
Manufacturer
Maxim
Datasheet
1.MAX1763.pdf
(16 pages)
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The MAX1763 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. This device maintains exception-
ally low quiescent supply current (110µA) despite its
high 1MHz operating frequency. Small external compo-
nents and a tiny package make this device an excellent
choice for small hand-held applications that require the
longest possible battery life.
The MAX1763 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 one to three alkaline or NiCd/NiMH
cells or a single Lithium-ion (Li+) cell. Maxim's propri-
etary Idle Mode™ circuitry significantly improves effi-
ciency at light load currents while smoothly transitioning
to fixed-frequency PWM operation at higher load cur-
rents to maintain excellent full-load efficiency. Low-
noise, forced-PWM mode is available for applications
that require constant-frequency operation at all load
currents. The MAX1763 may also be synchronized to
an external clock to protect sensitive frequency bands
in communications equipment.
The MAX1763 includes an on-chip linear gain block
that can be used to build a high-power external linear
regulator or as a low-battery comparator. Soft-start and
current limit functions permit optimization of efficiency,
external component size, and output voltage ripple.
The MAX1763 is available in a space-saving 16-pin
QSOP package or a high-power (1.5W) 16-pin TSSOP-
EP package.
19-1698; Rev 1; 2/01
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.
PWM
0.7V TO 5.5V
OR NORMAL
BLOCK INPUT
OFF
ON
LBI OR GAIN
IN
Typical Operating Circuit
ON
OFF
________________________________________________________________ Maxim Integrated Products
General Description
ONB
ONA
CLK/SEL
AIN
ISET
REF
FB
MAX1763
1.5µH
GND
PGND
POUT
OUT
AO
LX
1.5A, Low-Noise, 1MHz, Step-Up
GAIN BLOCK OUTPUT
3.3V AT 1.5A
LBO OR
OUT
o Up to 94% Efficiency
o +0.7V to +5.5V Input Voltage Range
o 1.1V Guaranteed Startup Input Voltage
o Up to 1.5A Output
o Fixed 3.3V Output or Adjustable (2.5V to 5.5V)
o 1MHz PWM Synchronous-Rectified Topology
o 1µA Logic-Controlled Shutdown
o Analog Gain Block for Linear-Regulator or Low-
o Adjustable Current Limit and Soft-Start
o 1.5W TSSOP Package Available
*EP = Exposed pad
________________________Applications
Idle Mode is a trademark of Maxim Integrated Products.
MAX1763EEE
MAX1763EUE
Battery Comparator
Digital Cordless
Phones
PCS Phones
Wireless Handsets
TOP VIEW
PART
DC-DC Converter
GND
ONA
ISET
OUT
REF
AIN
AO
FB
1
2
3
4
5
6
7
8
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
TSSOP-EP
MAX1763
QSOP
Pin Configuration
Hand-Held
Instruments
Palmtop Computers
Personal
Communicators
16
15
14
13
12
11
10
9
ONB
POUT
LX
POUT
PGND
LX
PGND
CLK/SEL
16 QSOP
16 TSSOP-EP*
PIN-PACKAGE
Features
1
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