MAX1703ESE+-MAX1703ESE+T-MAX1703ESE-T Fast Delivery |IC PHOENIX CO.,LIMITED

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 = ..
MAX1703ESE-T ,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-T ,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 ..
MAX17040G+T ,Compact, Low-Cost 1S/2S Fuel GaugesELECTRICAL CHARACTERISTICS(2.5V ≤ V≤ 4.5V, T = -20°C to +70°C, unless otherwise noted. Contact Maxi ..
MAX17040G+U ,Compact, Low-Cost 1S/2S Fuel GaugesELECTRICAL CHARACTERISTICS RECOMMENDED DC OPERATING CONDITIONS(2.5V ≤ V≤ 4.5V, T = -20°C to +70°C, ..
MAX17041G+T ,Compact, Low-Cost 1S/2S Fuel GaugesFeatures♦ Host-Side or Battery-Side Fuel GaugingThe MAX17040/MAX17041 are ultra-compact, low-cost,1 ..
MAX4522EUE+ ,Quad, Low-Voltage SPST Analog SwitchesELECTRICAL CHARACTERISTICS—Dual Supplies(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, T = T to T , unl ..
MAX4523 ,Quad, Low-Voltage SPST Analog SwitchesApplicationsMAX4521CPE 0°C to +70°C 16 Plastic DIPBattery-Operated EquipmentMAX4521CSE 0°C to +70°C ..
MAX4523CEE ,Quad / Low-Voltage / SPST Analog SwitchesELECTRICAL CHARACTERISTICS—Dual Supplies(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, T = T to T , unl ..
MAX4523CSE ,Quad / Low-Voltage / SPST Analog SwitchesMAX4521/MAX4522/MAX452319-1136; Rev 1; 1/97Quad, Low-Voltage, SPST Analog Switches_______________
MAX4523EEE ,Quad / Low-Voltage / SPST Analog SwitchesApplications______________Ordering InformationBattery-Operated EquipmentPART TEMP. RANGE PIN-PACKAG ..
MAX4523EEE+ ,Quad / Low-Voltage / SPST Analog SwitchesELECTRICAL CHARACTERISTICS—Dual Supplies(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, T = T to T , unl ..

MAX1703ESE+-MAX1703ESE+T-MAX1703ESE-T
1-Cell to 3-Cell, High Power (1.5A), Low-Noise, Step-Up DC-DC Converter
________________General Description
The 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
________________________Applications
Digital 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
19-1336; Rev 2; 11/98
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Ordering Information
Typical Operating Circuit
PARTTEMP. RANGEPIN-PACKAGE
MAX1703ESE-40°C to +85°C16 Narrow SO
PGNDGNDFB
POUT
OUT
LXP, LXNOFF
INPUT
0.7V TO 5.5V
SYNC
PWM
PFM
OUTPUT
5V OR ADJ
UP TO 1.5A
CLK/
SEL
POKIN
POK
AIN
REF
POWER-GOOD
INPUTPOWER-GOOD
OUTPUTGAIN-BLOCK INPUT
GAIN-BLOCK
OUTPUT
MAX1703
Pin Configuration
REFON
POUT
LXP
POUT
PGND
LXN
PGND
CLK/SEL
TOP VIEW
MAX1703
Narrow SO
POKIN
AIN
OUT
GND
POK
Switch On-Resistance
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, unless
otherwise 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
ILOAD< 1mA, TA= +25°C (Note 3)
CLK/SEL = GND
CLK/SEL = GND
(Note 2)
CLK/SEL = OUT
N-channel
VON= VLXN= VOUT= 5.5V= OUT
CLK/SEL = OUT, no load to full load
VLXP= 0V, VOUT= VON= 5.5V
(Note 5)
VOUT= 1.5V
VFB< 0.1V, CLK/SEL = OUT,
0 ≤ILX≤1.1A, VBATT= 3.7V
Adjustable output, CLK/SEL = OUT,
0 ≤ILX≤1.1A, VBATT= 2.2V, VOUT= 3.3V
CLK/SEL = OUT (Note 1)
VFB= 1.25V
CLK/SEL = GND (Note 1)
CONDITIONS20160260P-Channel Turn-Off Current5008001100N-Channel Current LimitmA220027003200
0.0750.13Ω
0.140.250.120LXN Leakage Current0.120POUT, LXP Leakage Current150300Supply Current in Low-Noise Mode65120Supply Current in Low-Power Mode0.91.1Minimum Start-Up Voltage0.75.5Input Supply Range0.120Supply Current in Shutdown-1.6Load Regulation (Note 6)2.02.152.3Output Voltage Lockout Threshold2.55.5Output Voltage Adjust Range
kHz40140300Frequency in Start-Up Mode4.875.055.20Output Voltage
(Note 4)1.211.241.255FB Regulation Voltage0.120FB Input Current
UNITSMINTYPMAXPARAMETER
P-channel0.130.25
Switch On-Resistance
CLK/SEL = GND
CLK/SEL = OUT
Rising VPOKINV1.2251.2501.275POKIN Trip Level
VPOKIN= 0.7VnA-2020POKIN Input Current
ISINK(POK) = 1mA, VOUT= 3.6V or
ISINK(POK) = 20µA, VOUT= 1VV0.030.4POK Low Voltage
VOUT= VPOK= 5.5VµA0.011POK High Leakage Current
DC-DC CONVERTER
DC-DC SWITCHES
POWER-GOOD COMPARATOR
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, unless
otherwise noted. Typical values are at TA= +25°C.)
CLK/SEL = OUT, VFB= 0.5V
CLK/SEL = OUT, VFB= 0.5V
ON, CLK/SEL
CLK/SEL, VOUT= 5.5V
CLK/SEL, VOUT= 2.5V
ON, 1.2V < VOUT< 5.5V (Note 7)
VAIN= 1.5V, VAO= 5.5V
VAIN= 0.5V, IAO= 100µA
2.5V < VOUT< 5.5V
-1µA < IREF< 50µA
10µA < IAO< 100µA
VAIN= 1.5V
IREF= 0µA
IAO= 20µA
CONDITIONS
kHz200400External Clock Frequency Range808690Oscillator Maximum Duty Cycle
kHz260300340Internal Oscillator Frequency-10.011Logic Input Current0.8VOUTInput High Voltage0.2VOUTInput Low Voltage0.2VOUT0.25REF Supply Rejection515REF Load Regulation1.2371.2501.263Reference Output Voltage0.011AO Output High Leakage0.10.4AO Output Low Voltage
mmho51016Transconductance-3030AIN Input Current1.2371.251.263AIN Reference Voltage
UNITSMINTYPMAXPARAMETER100Maximum CLK/SEL Rise/Fall Time200Minimum CLK/SEL Pulse Width
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, unless
otherwise noted. Typical values are at TA= +25°C.) (Note 8)= OUT
(Note 5)
VFB< 0.1V, CLK/SEL = OUT,
0 ≤ILX≤1.1A, VBATT= 3.7V
Adjustable output, CLK/SEL = OUT,
0 ≤ILX≤1.1A, VOUT= 3.3V, VBATT= 2.2V
CLK/SEL = OUT (Note 1)
CLK/SEL = GND (Note 1)
CONDITIONS300Supply Current in Low-Noise Mode120Supply Current in Low-Power Mode20Supply Current in Shutdown2.02.3Output Voltage Lockout Threshold4.875.20Output Voltage (Note 4)1.201.27FB Regulation Voltage
UNITSMINTYPMAXPARAMETER
DC-DC CONVERTER
ON, 1.2V < VOUT< 5.5V0.8VOUT
GAIN BLOCK
REFERENCE
LOGIC INPUTS
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, unless
otherwise noted. Typical values are at TA= +25°C.) (Note 8)
CLK/SEL = GND
CLK/SEL = OUT
CLK/SEL = GND
CLK/SEL = OUT
N-channel
CONDITIONS
P-channel
Rising VPOKINV1.2251.275POKIN Trip Level
Switch On-Resistance5001100N-Channel Current LimitmA22003600
IAO= 20µA
0.251.231.27AIN Reference Voltage
UNITSMINTYPMAXPARAMETER
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.
10µA < IAO<100µAmmho516Transconductance
IREF= 0µAV1.231.27Reference Output Voltage
CLK/SEL = OUT, VFB= 0.5VkHz260340Internal Oscillator Frequency
CLK/SEL = OUT, VFB= 0.5V%8092Oscillator Maximum Duty Cycle
DC-DC SWITCHES
POWER-GOOD COMPARATOR
GAIN BLOCK
REFERENCE
LOGIC INPUTS
MAX1703
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
0.1110100100010,000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 5V)
MAX1703-01
LOAD CURRENT (mA)
EFFICIENCY (%)60
VIN = 3.6V
VIN = 2.4V
VIN = 1.2V
PFM
PWM
0.1110100100010,000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
MAX1703-02
LOAD CURRENT (mA)
EFFICIENCY (%)60
VIN = 2.4V
VIN = 1.2V
VIN = 0.9V
PFM
PWM41256
NO-LOAD BATTERY CURRENT
vs. INPUT VOLTAGE
MAX1703-03
INPUT VOLTAGE (V)
BATTERY CURRENT (mA)
TA = +85°C
LOW-POWER MODE
TA = +25°C
TA = -40°C
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1703-04
INPUT VOLTAGE (V)
SHUTDOWN CURRENT (
TA = +85°C
INCLUDES ALL EXTERNAL
COMPONENT LEAKAGES.
CAPACITOR LEAKAGE
DOMINATES AT TA = +85°C
TA = +25°C,
TA = -40°C
REFERENCE VOLTAGE
vs. REFERENCE CURRENT
MAX1703-07
REFERENCE CURRENT (mA)
REFERENCE VOLTAGE (V)
VIN = 3.6V
VOUT = 5V
LOW-POWER MODE
START-UP VOLTAGE vs. LOAD CURRENT
MAX1703-05
LOAD CURRENT (mA)
START-UP VOLTAGE (V)1.0
VOUT = 5V
PWM MODE
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1703-06
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
1001k10k100k1M10M
NOISE SPECTRUM
MAX1703-14
FREQUENCY (Hz)
NOISE (mV
RMSVOUT = 5V
VIN = 3.6V
ILOAD = 500mA
__________________________________________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.)
FREQUENCY vs. TEMPERATURE
MAX1703-15
TEMPERATURE (°C)
FREQUENCY (kHz)
VOUT = 5V
VOUT = 3.3V
PEAK INDUCTOR CURRENT LIMIT
vs. OUTPUT VOLTAGE
MAX1703-16
OUTPUT VOLTAGE (V)
CURRENT LIMIT(A)
PWM
LOW POWER (PFM)s/div
ILOAD = 1.5A, C7 = 0.47mF
HEAVY LOAD SWITCHING
MAX1703-08
2ms/div
VOUT IS AC COUPLED
LOAD CURRENT = 0A TO 1.5A
VOUT
(50mV/div)
1.0A
0.5A
LOAD-TRANSIENT RESPONSE
MAX1703-10
2ms/div
VIN = 2.6V TO 3.6V, VOUT IS AC COUPLED
VOUT
(50mV/div)
VIN
LINE-TRANSIENT RESPONSE
MAX1703-09
1ms/div
VIN = 2.6V TO 3.6V, VOUT IS AC COUPLED
VON
VOUT
(2V/div)
IIN
(0.2A/div)
POWER-ON DELAY
(PFM MODE)
MAX1703-11
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.)
1ms/div
VIN = 3.6V, VOUT = 5V, COUT = 470mF,
PULSE WIDTH = 577ms, LOAD CURRENT = 100mA TO 1A
VOUT
(100mV/div)
ILOAD
(0.5A/div)
GSM LOAD-TRANSIENT RESPONSE
MAX1703-12
2ms/div
VIN = 1.2V, VOUT = 3.3V, COUT = 470mF,
PULSE WIDTH = 416ms, LOAD CURRENT = 50mA TO 400mA
VOUT
(100mV/div)
ILOAD
(0.2A/div)
DECT LOAD-TRANSIENT RESPONSE
MAX1703-13
PIN
Dual-Mode™ Feedback Input. Connect FB to ground to set a fixed output voltage of +5V. Connect a
divider between the output voltage and GND to set the output voltage from 2.5V to 5.5V.FB2
Reference Output. Bypass with a 0.22µF bypass capacitor to GND.REF1
FUNCTIONNAME
DC-DC Converter Output. Power source for the IC.OUT4
Power-Good Comparator Input. Threshold is 1.250V, with 1% hysteresis on the threshold’s rising edge.POKIN3
Power-Good Comparator Output. This open-drain N-channel output is low when VPOKIN< 1.250V.POK8
Gain-Block Output. This open-drain output sinks current when VAIN< VREF.AO7
Gain-Block Input. When AIN is low, AO sinks current. The nominal transconductance from AIN to AO is
10mmhos.AIN6
GroundGND5
Source of P-Channel Synchronous Rectifier MOSFET Switch. Connect an external Schottky diode from LXN
and LXP to POUT.POUT13, 15
Source of N-Channel Power MOSFET SwitchPGND10, 12
On/Off Input. When ONis low, the IC turns on.ON16
Switch-Mode Selection and External-Clock Synchronization Input:CLK/SEL = Low: Low-power, low-quiescent-current PFM mode. Delivers up to 10% of full load current.CLK/SEL = High: High-power PWM mode. Full output power available. Operates in low-noise, constant-
frequency mode.CLK/SEL = External Clock: High-power PWM mode with the internal oscillator synchronized to the exter-
nal CLK
Turning on with CLK/SEL = 0V also serves as a soft-start function, since peak inductor current is limited to
25% of that allowed in PWM mode.
CLK/SEL9
Dual Mode is a trademark of Maxim Integrated Products.
Drain of N-Channel Power Switch. Connect LXP to LXN.LXN11
Drain of P-Channel Synchronous Rectifier. Connect LXP to LXN.LXP14
MAX1703
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
_______________Detailed Description
The 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.
2.15V
IC POWER
1.25V
DUAL
MODE/
OUT
REFERENCE
UNDERVOLTAGE LOCKOUT
START-UP
OSCILLATOR
300kHz
OSCILLATOR
PFM/PWM
CONTROLLER
PFM/PWMD
POUT
LXN
LXP
PGND
COMPARATOR
OSC
MODEQ
OUT
REF
POKIN
GND
CLK/SELRDY
REF
REF
OUT
MAX1703
POK
GAIN
BLOCK
REF
AIN
Figure 1. Functional Block Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX1703ESE+ \|MAX1703ESE	MAXIM	N/a	68	avai	1-Cell to 3-Cell, High Power (1.5A), Low-Noise, Step-Up DC-DC Converter
MAX1703ESE+T \|MAX1703ESET	MAXIM	N/a	6651	avai	1-Cell to 3-Cell, High Power (1.5A), Low-Noise, Step-Up DC-DC Converter
MAX1703ESE-T \|MAX1703ESET	MAXIM	N/a	450	avai	1-Cell to 3-Cell, High Power (1.5A), Low-Noise, Step-Up DC-DC Converter
MAX1703ESE-T \|MAX1703ESET	MAX	N/a	5	avai	1-Cell to 3-Cell, High Power (1.5A), Low-Noise, Step-Up DC-DC Converter