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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1763 Datasheet

1.5A / Low-Noise / 1MHz / Step-Up DC-DC Converter

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MAX1763 pdf
19-1698; Rev 1; 2/01
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
General Description
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.
Typical Operating Circuit
IN
0.7V TO 5.5V
PWM
OFF
ON ON
OFF
OR NORMAL
LBI OR GAIN
BLOCK INPUT
1.5µH
LX
POUT
OUT
3.3V AT 1.5A
MAX1763
ONB OUT
ONA
CLK/SEL
AIN
ISET
REF
FB
AO
LBO OR
GND PGND GAIN BLOCK OUTPUT
Features
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-
Battery Comparator
o Adjustable Current Limit and Soft-Start
o 1.5W TSSOP Package Available
________________________Applications
Digital Cordless
Phones
Hand-Held
Instruments
PCS Phones
Palmtop Computers
Wireless Handsets
Personal
Communicators
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1763EEE
-40°C to +85°C 16 QSOP
MAX1763EUE
-40°C to +85°C 16 TSSOP-EP*
*EP = Exposed pad
Idle Mode is a trademark of Maxim Integrated Products.
Pin Configuration
TOP VIEW
ONA 1
ISET 2
REF 3
GND 4
FB 5
OUT 6
AIN 7
AO 8
MAX1763
16 ONB
15 POUT
14 LX
13 POUT
12 PGND
11 LX
10 PGND
9 CLK/SEL
QSOP
TSSOP-EP
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1763 Datasheet

1.5A / Low-Noise / 1MHz / Step-Up DC-DC Converter

No Preview Available !

MAX1763 pdf
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
ONA, ONB, AO, OUT to GND.......................................0.3V, +6V
PGND to GND.....................................................................±0.3V
LX to PGND ............................................-0.3V to (VPOUT + 0.3V)
CLK/SEL, REF, FB, ISET, POUT,
AIN to GND.........................................-0.3V to (VOUT + 0.3V)
POUT to OUT ......................................................................±0.3V
Continuous Power Dissipation
16-Pin QSOP (derate 8.7mW/°C above +70°C)...........667mW
16-Pin TSSOP-EP (derate 19mW/°C above +70°C) ...........1.5W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(CLK/SEL = ONB = FB = PGND = GND, ISET = REF, OUT = POUT, VONA = VAIN = VOUT = 3.6V, TA = 0°C to +85°C, unless other-
wise noted. Typical values are at TA = +25°C.)
PARAMETER
DC-DC CONVERTER
Input Voltage Range (Note 1)
CONDITIONS
MIN TYP MAX UNITS
0.7 5.5
V
Minimum Startup Voltage
(Note 2)
ILOAD < 1mA, TA = +25°C
0.9 1.1
V
Temperature Coefficient of
Startup Voltage
ILOAD < 1mA
-2 mV/°C
Frequency in Startup Mode
Internal Oscillator Frequency
VOUT = 1.5V
CLK/SEL = OUT
125 500 1000 kHz
0.8 1 1.2 MHz
Oscillator Maximum Duty Cycle
(Note 3)
80 86 90 %
External Clock Frequency Range
0.5 1.2 MHz
Output Voltage
FB Regulation Voltage
FB Input Current
Load Regulation
Output Voltage Adjust Range
Output Voltage Lockout
Threshold (Note 4)
ISET Input Leakage Current
Supply Current in Shutdown
No-Load Supply Current, Low-
Power Mode (Note 5)
No-Load Supply Current, Low-
Noise Mode
Gain Block Supply Current
VFB < 0.1V, CLK/SEL = OUT, includes load regulation
for 0 < ILX < 1.1A
Adjustable output, CLK/SEL = OUT, includes load
regulation for 0 < ILX < 1.1A
VFB = 1.35V
CLK/SEL = OUT, 0 < ILX < 1.1A
Rising edge
VISET = 1.25V
V ONB = 3.6V, VONA = 0
CLK/SEL = GND, AIN = OUT
CLK/SEL = OUT
VAIN < (VOUT - 1.4V), gain block enabled
3.17 3.3 3.38
V
1.215 1.245 1.270
0.01 100
-1.0
2.5 5.5
2.00 2.15 2.30
0.01 50
1 10
110 200
V
nA
%
V
V
nA
µA
µA
2.5 mA
25 50 µA
2 _______________________________________________________________________________________


Part Number MAX1763
Description 1.5A / Low-Noise / 1MHz / Step-Up DC-DC Converter
Maker Maxim
Total Page 16 Pages
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