19-1698; Rev 2; 4/11
KIT
ATION
EVALU
LE
B
AVAILA
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
The MAX1763 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. This device maintains exceptionally low quiescent supply current (110µA) despite its
high 1MHz operating frequency. Small external components 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 pulsewidth-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 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. Lownoise, 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 TSSOPEP package.
Typical Operating Circuit
♦
♦
♦
♦
♦
Up to 1.5A Output
Fixed 3.3V Output or Adjustable (2.5V to 5.5V)
1MHz PWM Synchronous-Rectified Topology
1µA Logic-Controlled Shutdown
Analog Gain Block for Linear-Regulator or LowBattery Comparator
♦ Adjustable Current Limit and Soft-Start
♦ 1.5W TSSOP Package Available
Idle Mode is a trademark of Maxim Integrated Products.
________________________Applications
Digital Cordless
Phones
Hand-Held
Instruments
PCS Phones
Palmtop Computers
Wireless Handsets
Personal
Communicators
Ordering Information
TEMP RANGE
PIN-PACKAGE
MAX1763EEE+
PART
-40°C to +85°C
16 QSOP
MAX1763EUE+
-40°C to +85°C
16 TSSOP-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad
Pin Configuration
LX
POUT
PWM
♦ Up to 94% Efficiency
♦ +0.7V to +5.5V Input Voltage Range
♦ 1.1V Guaranteed Startup Input Voltage
1.5μH
IN
0.7V TO 5.5V
OFF
ON
Features
OUT
3.3V AT 1.5A
ONB
ONA
16 ONB
15 POUT
REF 3
OUT
ONA 1
ISET 2
MAX1763
ON
OFF
TOP VIEW
14 LX
GND 4
CLK/SEL
OR NORMAL
LBI OR GAIN
BLOCK INPUT
AIN
13 POUT
12 PGND
OUT 6
ISET
REF
FB
MAX1763
FB 5
AIN 7
AO
GND
PGND
LBO OR
GAIN BLOCK OUTPUT
11 LX
10 PGND
AO 8
9
CLK/SEL
QSOP
TSSOP-EP
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX1763
General Description
