MAX1703ESE ,1-Cell to 3-Cell / High-Power 1.5A / Low-Noise / Step-Up DC-DC ConverterApplicationsMAX848/MAX849.Digital Cordless Phones Personal CommunicatorsThe MAX1703 evaluation kit ..
MAX1703ESE ,1-Cell to 3-Cell / High-Power 1.5A / Low-Noise / Step-Up DC-DC ConverterELECTRICAL CHARACTERISTICS (continued)(CLK/SEL = AIN = ON = POKIN = FB = PGND = GND, OUT = POUT, LX ..
MAX1703ESE ,1-Cell to 3-Cell / High-Power 1.5A / Low-Noise / Step-Up DC-DC Converterfeatures a pulse-frequency-modulation (PFM) low-power mode to improve efficiency ' 1µA Logic-Contro ..
MAX1703ESE ,1-Cell to 3-Cell / High-Power 1.5A / Low-Noise / Step-Up DC-DC ConverterELECTRICAL CHARACTERISTICS(CLK/SEL = AIN = ON = POKIN = FB = PGND = GND, OUT = POUT, LXP = LXN, V = ..
MAX1703ESE+ ,1-Cell to 3-Cell, High Power (1.5A), Low-Noise, Step-Up DC-DC ConverterELECTRICAL CHARACTERISTICS (continued)(CLK/SEL = AIN = ON = POKIN = FB = PGND = GND, OUT = POUT, LX ..
MAX1703ESE+T ,1-Cell to 3-Cell, High Power (1.5A), Low-Noise, Step-Up DC-DC ConverterELECTRICAL CHARACTERISTICS(CLK/SEL = AIN = ON = POKIN = FB = PGND = GND, OUT = POUT, LXP = LXN, V = ..
MAX4522CUE+ ,Quad, Low-Voltage SPST Analog SwitchesApplicationsMAX4521CPE 0°C to +70°C 16 Plastic DIPBattery-Operated EquipmentMAX4521CSE 0°C to +70°C ..
MAX4522EEE ,Quad / Low-Voltage / SPST Analog SwitchesGeneral Description ________
MAX4522EEE+ ,Quad, Low-Voltage SPST Analog SwitchesFeaturesThe MAX4521/MAX4522/MAX4523 are quad, low-volt-
MAX1703ESE
1-Cell to 3-Cell / High-Power 1.5A / Low-Noise / Step-Up DC-DC Converter
________________General DescriptionThe MAX1703 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. It uses a synchronous-rectified
pulse-width-modulation (PWM) boost topology to gen-
erate a 2.5V to 5.5V output from battery inputs, such as
one to three NiCd/NiMH cells or one Li-Ion cell. The
device includes a 2A, 75mΩ, N-channel MOSFET
switch and a 140mΩ, P-channel synchronous rectifier.
With its internal synchronous rectifier, the MAX1703
delivers up to 5% better efficiency than similar nonsyn-
chronous converters. It also features a pulse-frequency-
modulation (PFM) low-power mode to improve efficiency
at light loads, and a 1µA shutdown mode.
The MAX1703 comes in a 16-pin narrow SO package
and includes an uncommitted comparator that generates
a power-good or low-battery-warning output. It also
contains a linear gain block that can be used to build a
linear regulator.
For lower-power outputs and a smaller package, refer
to the MAX1700/MAX1701. For dual outputs (step-up
plus linear regulator), refer to the MAX1705/MAX1706.
For an on-board analog-to-digital converter, refer to the
MAX848/MAX849.
The MAX1703 evaluation kit is available to speed designs.
____________________________FeaturesUp to 95% EfficiencyUp to 1.5A OutputFixed 5V or Adjustable Step-Up Output
(2.5V to 5.5V)0.7V to 5.5V Input RangeLow-Power Mode (300µW)Low-Noise, Constant-Frequency Mode (300kHz) Synchronizable Switching Frequency
(200kHz to 400kHz)1µA Logic-Controlled ShutdownPower-Good ComparatorUncommitted Gain Block
________________________ApplicationsDigital Cordless PhonesPersonal Communicators
PCS PhonesPalmtop Computers
Wireless HandsetsHand-Held Instruments
Two-Way Pagers
MAX1703
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
Pin Configuration
MAX1703
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(CLK/SEL = AIN = ON= POKIN = FB = PGND = GND, OUT = POUT, LXP = LXN, VOUT= 5.3V (Note 1), TA
= 0°C to +85°C, unlessotherwise noted. Typical values are at TA= +25°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.
OUT, ON, AO, POK to GND.....................................-0.3V to +6V
PGND to GND.....................................................................±0.3V
LXP, LXN to PGND.................................-0.3V to (VPOUT+ 0.3V)
POUT, CLK/SEL, AIN, REF, FB,
POKIN to GND.......................................-0.3V to (VOUT+ 0.3V)
Continuous Power Dissipation (TA = +70°C)
Narrow SO (derate 8.70mW/°C above +70°C).............696mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX1703
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)(CLK/SEL = AIN = ON= POKIN = FB = PGND = GND, OUT = POUT, LXP = LXN, VOUT= 5.3V (Note 1), TA
= 0°C to +85°C, unlessotherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS (CLK/SEL = AIN = ON= POKIN = FB = PGND = GND, OUT = POUT, LXP = LXN, VOUT= 5.3V (Note 1), TA
= -40°C to +85°C, unlessotherwise noted. Typical values are at TA= +25°C.) (Note 8)
MAX1703
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)(CLK/SEL = AIN = ON= POKIN = FB = PGND = GND, OUT = POUT, LXP = LXN, VOUT= 5.3V (Note 1), TA
= -40°C to +85°C, unlessotherwise noted. Typical values are at TA= +25°C.) (Note 8)
Note 1:Supply current from the 5.05V output is measured between the 5.05V output and the OUT pin. This current correlates
directly to the actual battery supply current, but is reduced in value according to the step-up ratio and efficiency. Set
VOUT= 5.3V to keep the internal switch open when measuring the device operating current.
Note 2:Minimum operating voltage. Since the regulator is bootstrapped to the output, once started it will operate down to a 0.7V
input.
Note 3:Start-up is tested with the circuit of Figure 2.
Note 4:In low-power mode (CLK/SEL = GND) the output voltage regulates 1% higher than low-noise mode (CLK/SEL = OUT or
synchronized).
Note 5:The regulator is in start-up mode until this voltage is reached. Do not apply full-load current below this voltage.
Note 6:Load regulation is measured from no-load to full load, where full load is determined by the N-channel switch current limit.
Note 7:The ONinput has a total hysteresis of approximately 0.15 x VOUT.
Note 8:Specifications to -40°C are guaranteed by design and not production tested.
MAX1703
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
__________________________________________Typical Operating Characteristics(VIN= +3.6V, VOUT= 5V, TA = +25°C, unless otherwise noted.)
MAX1703
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
_________________________________Typical Operating Characteristics (continued)(VIN= +3.6V, VOUT= 5V, TA = +25°C, unless otherwise noted.)
MAX1703
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
Pin Description
_________________________________Typical Operating Characteristics (continued)(VIN= +3.6V, VOUT= 5V, TA = +25°C, unless otherwise noted.)
Dual Mode is a trademark of Maxim Integrated Products.
MAX1703
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
_______________Detailed DescriptionThe MAX1703 is a highly efficient, low-noise power
supply for portable RF and data-acquisition instru-
ments. It combines a boost switching regulator, N-
channel power MOSFET, P-channel synchronous
rectifier, precision reference, shutdown control, versa-
tile gain block, and power-good (POK) comparator
(Figure 1) in a 16-pin narrow SO package.
The switching DC-DC converter boosts a 1- to 3-cell
input to a fixed 5V or an adjustable output between
2.5V and 5.5V. Typically the MAX1703 starts from a
low, 0.9V input and remains operational down to 0.7V.
The MAX1703 is optimized for use in cellular phones
and other applications requiring low noise during full-
power operation, as well as low quiescent current for
maximum battery life in low-power mode and shut-
down. It features constant-frequency (300kHz), low-
noise PWM operation with up to 1.5A output capability.
See Table 1 for typical outputs. A low-quiescent-cur-
rent, low-power mode offers an output up to 150mA
and reduces quiescent power consumption to 300µW.
In shutdown mode, the quiescent current is further
reduced to just 1µA. Figure 2 shows the standard appli-
cation circuit for the MAX1703.
Figure 1. Functional Block Diagram
