MAX1708EEE+-MAX1708EEE+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1708EEE+T ,High-Frequency, High-Power, Low-Noise, Step-Up DC-DC ConverterApplications Ordering InformationRouters, Servers, Workstations, Card RacksPART TEMP. RANGE PIN-PAC ..
MAX1709ESE ,4A / Low-Noise / High-Frequency / Step-Up DC-DC Converter
MAX1709ESE+ ,4A, Low-Noise, High-Frequency, Step-Up DC-DC ConverterApplicationsPART TEMP. RANGE PIN-PACKAGERouters, Servers, Workstations, Card RacksMAX1709ESE -40°C ..
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MAX4529ESA+ ,Low-Voltage, Bidirectional RF Video SwitchApplicationsMAX4529CPA 0°C to +70°C 8 Plastic DIP —RF SwitchingMAX4529CSA 0°C to +70°C 8 Narrow SO ..
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MAX4529EUA ,Low-Voltage / Bidirectional RF/Video SwitchELECTRICAL CHARACTERISTICS—Dual Supplies(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, V = 0.8V, V = 2. ..
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MAX452CSA ,CMOS Video Multiplexer/Amplifierapplications, these amprfers will directly drive a 150 ohm load to bN, and will swing k11/ into a ..
MAX452CSA ,CMOS Video Multiplexer/AmplifierELECTRICAL CHARACTERISTICS MAX452/3/4/5 (V + = +5V, V‘ = -w, -2vs Mn S +2V, Output Load Resistor=1 ..

MAX1708EEE+-MAX1708EEE+T
High-Frequency, High-Power, Low-Noise, Step-Up DC-DC Converter
General Description
The MAX1708 sets a new standard of space savings for
high-power, step-up DC-DC conversion. It delivers up
to 10W at a fixed (3.3V or 5V) or adjustable (2.5V to
5.5V) output, using an on-chip power MOSFET from a
0.7V to 5V supply.
Fixed-frequency PWM operation ensures that the
switching noise spectrum is constrained to the 600kHz
fundamental and its harmonics, allowing easy postfilter-
ing for noise reduction. External clock synchronization
capability allows for even tighter noise spectrum con-
trol. Quiescent power consumption is less than 1mW to
extend operating time in battery-powered systems.
Two control inputs (ONA, ONB) allow simple push-on,
push-off control through a single momentary push-but-
ton switch, as well as conventional on/off logic control.
The MAX1708 also features programmable soft-start
and current limit for design flexibility and optimum per-
formance with batteries. The maximum RMS switch cur-
rent rating is 5A. For a device with a higher (10A)
switch current rating, refer to the MAX1709 data sheet.
________________________Applications
Routers, Servers, Workstations, Card Racks
Local 2.5V to 3.3V or 5V Conversion
Local 3.3V to 5V Conversion
3.6V or 5V RF PAs in Communications Handsets
FeaturesOn-Chip 5A Power MOSFET5V, 2A Output from a 3.3V InputFixed 3.3V or 5V Output Voltage or
Adjustable (2.5V to 5.5V)Input Voltage Range Down to 0.7VLow Power Consumption
1mW Quiescent Power
1µA Current in Shutdown ModeLow-Noise, Constant Frequency Operation
(600kHz)Synchronizable Switching Frequency
(350kHz to 1000kHz)Small QSOP Package
MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
ONBCLK
3.3/5
PGND
PGND
PGND
OUT
GND
TOP VIEW
MAX1708
QSOP
ONA
GND
SS/LIM
REF
Pin Configuration
ONA
REF
SS/LIM
CLK
OUTPUT
3.3V, 5V,
OR ADJ
UP TO 2A
OUT
GND
2.2μH
OFFON
INPUT
1V TO 5V
SYNC
INTERNAL
MAX1708
Typical Operating Circuit
19-2068; Rev 1; 11/10
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX1708EEE+ -40°C to +85°C 16 QSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VOUT= VCLK = 3.6V, ONA = ONB= FB = GND, 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.
ONA, ONB, OUT, SS/LIM, 3.3/5 to GND...............-0.3V to +6.0V
LX to PGND...........................................................-0.3V to +6.0V
FB, CLK, REF to GND..............................-0.3V to (VOUT+ 0.3V)
PGND to GND.......................................................-0.3V to +0.3V
Continuous Power Dissipation (TA= +70°C)
QSOP (derate 8.30mW/°C above +70°C). ..................667mW
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
Soldering Temperature (reflow).......................................+260°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
3.3/5 = GND, ISW = 0.5A 3.26 3.34 3.42 Output Voltage VFB < 0.1V (Note 1) 3.3/5 = OUT, ISW = 0.5A 4.90 5.05 5.20 V
Load Regulation Measured between 0.5A < ISW < 1.5A (Note 2) -0.40 -0.60 %/A
FB Regulation Voltage (VFB) ISW = 0.5A 1.215 1.240 1.265 V
FB Input Current VFB = 1.5V 1200 nA
Output Voltage Adjust Range 2.5 5.5 V
Output Undervoltage Lockout Rising and falling (Note 3) 2.0 2.3 V
Frequency in Startup Mode VOUT =1.5V 40 400 kHz
Minimum Startup Voltage IOUT< 1mA, TA = +25°C (Note 4) 0.9 1.1 V
Minimum Operating Voltage (Note 5) 0.7 V
Soft-Start Pin Current VSS/LIM = 1V 3.2 4 5.0 μA
OUT Supply Current VFB = 1.5V (Note 6) 200 300μA
OUT Leakage Current In
Shutdown VONB = 3.6V 0.1 2 μA
LX Leakage Current VLX = V ONB = VOUT = 5.5V 1 25 μA
N-Channel Switch
On-Resistance 30 80 m
SS/LIM = open 4.55.3 7.0N-Channel Current Limit SS/LIM = 150k to GND 1.803.00 3.85A
RMS Switch Current 5 ARMS
Reference Voltage IREF= 0mA 1.245 1.260 1.275 V
Reference Load Regulation -1μA IREF 50μA 4 10 mV
Reference Supply Rejection 2.5V VOUT 5.5V 0.2 5 mV
ONA, ONB,3.3/5, 1.2V < VOUT < 5.5V 0.2 VOUTInput Low Level (Note 7) CLK, 2.7V < VOUT < 5.5V 0.2 VOUTV
MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)
(VOUT= VCLK = 3.6V, ONA = ONB= FB = GND, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS
(VOUT= VCLK = 3.6V, ONA = ONB= FB = GND, TA= -40°C to +85°C, unless otherwise noted.) (Note 9)
PARAMETER CONDITIONS MIN TYP MAX UNITS
ONA, ONB,3.3/5, 1.2V < VOUT < 5.5V 0.8 VOUT Input High Level CLK, 2.7 V< VOUT < 5.5V 0.8 VOUT V
Logic Input Current VONA, VONB, VCLK, V3.3/5 = 0V, 5.5V -1 1 μA
Internal Oscillator Frequency 520 600 680 kHz
Maximum Duty Cycle 82 88 94 %
External Clock Frequency
Range 350 1000 kHz
CLK Pulse Width (Note 8) 100 ns
CLK Rise/Fall Time (Note 8) 50 Ns
PARAMETER CONDITIONS MIN MAX UNITS
3.3/5 = GND, ISW= 0.5A 3.24 3.45 Output Voltage VFB < 0.1V, VIN = 2.4V
(Note 1) 3.3/5 = OUT, ISW= 0.5A 4.90 5.22 V
FB Regulation Voltage ISW= 0.5A 1.20 1.28 V
FB Input Current (VFB) VFB = 1.5V 200 nA
Load Regulation Measured between 0.5A < ISW < 1.5A (Note 2) -0.60 %/A
Soft-Start Pin Current VSS/LIM = 1V 3.2 5.2 μA
OUT Leakage Current in
Shutdown VONB = 3.6V 2 μA
OUT Supply Current VFB = 1.5V (Note 6) 300 μA
N-Channel Switch
On-Resistance 80 m
SS/LIM = unconnected 4.5 7.5N-Channel Current Limit SS/LIM = 150k to GND 1.8 4.0A
Reference Voltage IREF = 0mA 1.24 1.28 V
Note 1:Output voltage is specified at 0.5A switch current ISW, which is equivalent to approximately 0.5A ✕(VIN/ VOUT) of load cur-
rent.
Note 2:Load regulation is measured by forcing specified switch current and straight-line calculation of change in output voltage in
external feedback mode. Note that the equivalent load current is approximately ISW✕(VIN/ VOUT).
Note 3:Until undervoltage lockout is reached, the device remains in startup mode. Do not apply full load until this voltage is
reached.
Note 4:Startup is tested with Figure 1’s circuit. Output current is measured when both the input and output voltages are applied.
Note 5:Minimum operating voltage. The MAX1708 is bootstrapped and will operate down to a 0.7V input once started.
Note 6:Supply current is measured from the output voltage (3.3V) to the OUT pin. This correlates directly with actual input supply
current but is reduced in value according to the step-up ratio and efficiency.
Note 7:ONA and ONBinputs have approximately 0.15V hysteresis.
Note 8:Guaranteed by design, not production tested.
Note 9:Specifications to -40°C are guaranteed by design, not production tested.
MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)
(VOUT= VCLK = 3.6V, ONA = ONB= FB = GND, TA= -40°C to +85°C, unless otherwise noted.) (Note 9)
PARAMETER CONDITIONS MIN MAX UNITS
ONA, ONB,3.3/5, 1.2V < VOUT < 5.5V 0.2 VOUTInput Low Level (Note 7) CLK, 2.7V < VOUT < 5.5V 0.2 VOUTV
ONA, ONB,3.3/5, 1.2V < VOUT < 5.5V 0.8 VOUTInput High Level CLK, 2.7V < VOUT < 5.5V 0.8 VOUTV
Logic Input Current VONA, VONB, VCLK, V3.3/5 = 0V, 5.5V -1 1 μA
Internal Oscillator Frequency 500 700 kHz
Maximum Duty Cycle 80 95 %
External Clock Frequency Range 350 1000 kHz
CLK Pulse Width (Note 8) 100 ns
CLK Rise/Fall Time (Note 8) 50 Ns
MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
Typical Operating Characteristics
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
0.11100010,000
EFFICIENCY vs. OUTPUT CURRENT
MAX1708 toc01a
OUTPUT CURRENT (mA)
EFFICIENCY (%)100VIN = 3.3V
VIN = 2.5V
VOUT = 5V
0.11100010,000
LOAD REGULATION
(VIN = 3.3V, VOUT = 5V)
MAX1708 toc03a
OUTPUT CURRENT (mA)
OUT
REGULATION (%)100
PLOT NORMALIZED TO IOUT = 500mA
0.11100010,000
LOAD REGULATION
(VIN = 2.5V, VOUT = 3.3V)
MAX1708 toc03b
OUTPUT CURRENT (mA)
OUT
REGULATION (%)100
PLOT NORMALIZED TO IOUT = 500mA
LINE REGULATION
(VOUT = 3.3V)
MAX1708 toc04b
INPUT VOLTAGE (V)
OUT
REGULATION (%)
PLOT NORMALIZED TO VIN = 2.5V
IOUT = 500mA
IOUT = 1A13456
NO LOAD INPUT CURRENT
vs. INPUT VOLTAGE
MAX1708 toc05a
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
VOUT = 5V, VIN INCREASING
VOUT = 3.3V, VIN INCREASING31456
NO LOAD INPUT CURRENT
vs. INPUT VOLTAGE
MAX1708 toc05b
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
VOUT = 3.3V, VIN DECREASING
VOUT = 5V, VIN DECREASING
LINE REGULATION
(VOUT = 5V)
MAX1708 toc04a
INPUT VOLTAGE (V)
OUT
REGULATION (%)
PLOT NORMALIZED TO VIN = 3.3V
IOUT = 500mA
IOUT = 1A
0.11100010,000
EFFICIENCY vs. OUTPUT CURRENT
MAX1708 toc01b
OUTPUT CURRENT (mA)
EFFICIENCY (%)100
VIN = 1.2V
VIN = 2.5V
VOUT = 3.3V
EFFICIENCY vs. SWITCHING FREQUENCY
MAX1708 toc02
SWITCHING FREQUENCY (kHz)
EFFICIENCY (%)
VIN = 3.3V, VOUT = 5V, IOUT =1A
MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
100010,000
STARTUP VOLTAGE vs. LOAD CURRENT
(VOUT = 5V)
MAX1708 toc06a
LOAD CURRENT (mA)
STARTUP VOLTAGE (V)
TA = -40°C
TA = +25°C
TA = +85°C
0.510010001010,000
STARTUP VOLTAGE vs. LOAD CURRENT
(VOUT = 3.3V)
MAX1708 toc06b
LOAD CURRENT (mA)
STARTUP VOLTAGE (V)
TA = -40°C
TA = +25°C
TA = +85°C
SWITCHING FREQUENCY
vs. TEMPERATURE
MAX1708 toc07
TEMPERATURE (°C)
FREQUENCY CHANGE (%)
VOUT = 3.3V
PLOT NORMALIZED TO 25°C
NOISE vs. FREQUENCY
MAX1708 toc08
FREQUENCY (MHz)
NOISE (
RESOLUTION = 1kHz0250200150100300
SWITCH CURRENT LIMIT
vs. SS/LIM RESISTANCE
MAX1708 toc09
SS/LIM RESISTANCE (kΩ)
SWITCH CURRENT LIMIT (A)1
SWITCH CURRENT LIMIT
vs. TEMPERATURE
MAX1708 toc10
TEMPERATURE (°C)
SWITCH CURRENT LIMIT (A)
VIN = 3.3V, VOUT = 5V
1μs/div
HEAVY SWITCHING WAVEFORM
VOUT
AC-COUPLED
50mV/div
VLX
5V/div
2A/div
MAX1708 toc11
100μs/div
LINE TRANSIENT RESPONSE
VOUT
AC-COUPLED
50mV/div
3.5V
VIN
500mV/div
MAX1708 toc12
Typical Operating Characteristics (continued)
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
Typical Operating Characteristics (continued)
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
40μs/div
LOAD TRANSIENT RESPONSE
IOUT
1A/div
VOUT
AC-COUPLED
50mV/div
ISW
2A/div
MAX1708 toc13
2ms/div
STARTUP WITHOUT SOFT-START
(CSS = 0)
VOUT
2V/div
IIN
1A/div
VONA
5V/div
MAX1708 toc14
RL = 5Ω
2ms/div
STARTUP WITH SOFT-START
(CSS = 0.01μF)
VOUT
2V/div
IIN
1A/div
VONA
5V/div
MAX1708 toc15
RL = 5Ω
2ms/div
STARTUP WITH SOFT-START
(CSS = 0.1μF)
VOUT
2V/div
IIN
1A/div
VONA
5V/div
MAX1708 toc16
RL = 5Ω

Partno	Mfg	Dc	Qty	Available	Descript
MAX1708EEE+ \|MAX1708EEE	MAX	N/a	350	avai	High-Frequency, High-Power, Low-Noise, Step-Up DC-DC Converter
MAX1708EEE+T	MAXIM	N/a	5000	avai	High-Frequency, High-Power, Low-Noise, Step-Up DC-DC Converter