MAXIM MAX710 MAX711 说明书

2024-07-28 作者:

19-1254; Rev 0; 7/97AL MANUTIK

NATIOETEVALUTA

SHEAD

SWFOLLO3.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

_______________General Description____________________________FeaturesThe MAX710/MAX711 integrate a step-up DC-DC con-verter with a linear regulator to provide step-up/downoStep-Up/Down Voltage Conversionvoltage conversion. They are optimized for batteryo+1.8V to +11V Input Rangeapplications where the input varies above and belowthe regulated output voltage. They have an input rangeoOutput:

from +1.8V to +11V. Typical efficiency when boosting5V/250mA at VIN= 1.8Vbattery inputs is 85%.

5V/500mA at VIN= 3.6VThe MAX710/MAX711 can be configured for minimumoNo External FETs Required

noise or optimum efficiency. Shutdown control turns offoLoad Disconnected from Input in Shutdownthe part completely, disconnecting the input from theoutput (ISHDN= 0.2µA). Standby control turns off onlyoBattery Drain:

the step-up converter and leaves the low-power linear200µA No-Load (VIN= 4V)regulator active (IQ= 7µA).

7µA in StandbyThe MAX710 has a preset 3.3V or 5V output voltage.0.2µA when Off

The MAX711 has an adjustable output that can be setoLow-Noise and High-Efficiency Modes

from +2.7V to +5.5V with two resistors. Both devicescome in 16-pin narrow SO packages.

________________________Applications______________Ordering InformationSingle-Cell, Lithium-Powered Portable DevicesDigital Cameras

PARTTEMP. RANGEPIN-PACKAGEMAX710C/D0°C to +70°CDice2- to 4-Cell AA Alkaline Hand-Held EquipmentMAX710ESE-40°C to +85°C16 Narrow SO3.3V and Other Low-Voltage Systems

MAX711C/D0°C to +70°CDice2-, 3-, and 4-Cell Battery-Powered EquipmentMAX711ESE-40°C to +85°C16 Narrow SOBattery-Powered Devices with AC Input Adapters

__________Typical Operating Circuit__________________Pin Configuration+1.8V TO +11VTOP VIEWINPUTC1N/ELBI+LBOL1LX116LXONOFFSHDNMAX710LXPGND215PGNDSTBYONSTBYC2ILIM314GND3.3VPSSHDN4MAX71013REF5V3/5STBY5MAX71112PSOUTOUTPUT3.3V/5V

3/5 (FB)611LBI+LBI-C4N/E710LBI-REFPGNDGNDILIMLBO89OUTC30.1µFSO( ) IS FOR THE MAX711.________________________________________________________________Maxim Integrated Products1

For free samples & the latest literature: , or phone small orders, phone 408-737-7600 ext. 710/MAX7113.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

MAX710/MAX711ABSOLUTE MAXIMUM RATINGS

PS, LX, OUT .-0.3V to +11.5VILIM, SHDN, STBY, FB, 3/5, N/E, LBO,

LBI-, LBI+, REF -0.3V to (VPS+ 0.3V)PGND -0.3V to +0.3VREF Short Circuit 700mA

Continuous Power Dissipation (TA= +70°C)

SO (derate 8.70mW/°C above +70°C)..........................696mWOperating -40°C to +85°CStorage -65°C to +160°+150°CLead Temperature (soldering, 10sec).............................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device ICAL CHARACTERISTICS

(VPS= 5.6V, STBY= PS, CREF= 0.1µF, COUT= 4.7µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at

TA= +25°C.) (Note 1)

PARAMETERInput VoltageFull Load Start-Up Voltage3/5= low,

IOUT= 0 to 250mA3/5= high, IOUT= 0 to250mA, VPS= 4.7VMAX7110 < IOUT< 250mA, STBY= PSSTBY= PS, 1.8V to 5VVSTBY= VSHDN= logic high, current measuredinto PS pin; ILOAD= 0VSTBY= 0VVSHDN= 0VTA= 0°C to +85°C, IREF= 0TA= -40°C to +85°C, IREF= 0VSTBY= 0V, linear regulatorMAX711, OUT = FBMAX711, OUT = FBFB = 1.25VVPS= 5.6VLX On-ResistanceLX Leakage CurrentLX Current LimitMAX710, VPS= 3.7VMAX711, VPS= 2.7VVLX= 5.6VILIM = PSILIM = GND0.51.1TA= 0°C to +85°CTA= -40°C to +85°C0mA ≤ILOAD≤250mA1.201.181.251.250.110.20.30.60.10.81.51.241.23TA= 0°C to +85°CTA= -40°C to +85°CTA= 0°C to +85°CTA= -40°C to +85°C4.84.63.173.05FB0.50.310070.11.1.311.320.60.91.211.31.95µAAΩN/E =PSN/E= GND (Note 2)CONDITIONSMIN1.81.80.95.05.03.33.35.25.33.433.555.5V%%/VµAµAµAVmAmV%nAVTYPMAX11.07.0UNITSVVOutput Voltage (MAX710)Output Voltage-Adjustment RangeOutput Voltage Load RegulationOutput Voltage Line RegulationQuiescent CurrentStandby Quiescent CurrentShutdown Quiescent CurrentReference VoltageStandby Output CurrentFB VoltageLoad RegulationFB Input Current2_______________________________________________________________________________________

3.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters ELECTRICAL CHARACTERISTICS (continued)

(VPS= 5.6V, STBY= PS, CREF= 0.1µF, COUT= 4.7µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at

TA= +25°C.) (Note 1)

PARAMETERVOUT= 5.0VOutput PFET ResistanceOutput PFET LeakageThermal ShutdownThermal Shutdown HysteresisLOGICInput Low VoltageInput High VoltageSTBY, SHDN, N/E, 3/5, ILIMSTBY, SHDN, N/E, 3/5, ILIM1.60.4VVMAX710, VOUT= 3.0VMAX711, VOUT= 2.7VVPS

= 3V, VOUT= 0VSTBY= PSSTBY= PSCONDITIONSMINTYP0.71.31.60.415020MAX1.32.43.03µA°C°CΩUNITSMAX710/MAX711Input Bias CurrentSTBY, SHDN, N/E, 3/5, ILIM150nALBI/LBO COMPARATORInput Range LBI-, LBI+(Note 3)1.210VInput Bias Current LBI-, LBI+VLBI-, VLBI+= 1.25V150nAHysteresis640100mVLBI/LBO Offset VoltageVLBI-= 1.25V-25+25mVLBO Output VoltageILBO= 2mA, VLBI-= 1.25V, VLBI+= 1V0.4IVLBO= -300µA, VLBI-= 1.25V, VLBI+= 2VVPS- 0.2VNote 1:Specifications at -40°C are guaranteed by design, not production 2:Guaranteed by design (see Table 1).

Note 3:The LBO comparator provides the correct result as long as one input is within the specified input range.

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3.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

MAX710/MAX711__________________________________________Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)

EFFICIENCY vs. OUTPUT CURRENT—

HIGH-EFFICIENCY MODE

(VOUT = 5V)

VIN = 5.6V80EFFICIENCY

(%)VIN = 3.6V70

VIN = 2.5VVIN = 1.8VVIN = 1VVOUT = 5VN/E = GND50

0.1

1

10

100

1000

OUTPUT CURRENT (mA)

50

0.1

1

10

100

1000

OUTPUT CURRENT (mA)

MAX710/711

TOC01EFFICIENCY vs. OUTPUT CURRENT—

HIGH-EFFICIENCY MODE

(VOUT = 3.3V)

MAX710/711

TOC02MINIMUM START-UP INPUT VOLTAGE

vs. LOAD CURRENT

1.81.6INPUT

VOLTAGE

(V)1.41.21.00.80.60.40.20

0

50

100

150

200

250

LOAD CURRENT (mA)

VOUT = 5VN/E = PSMAX710/711

TOC039090

VIN = 2.5V80EFFICIENCY

(%)VIN = 1.8VVIN = 1V60

VOUT = 3.3VN/E = GND2.0

70

60

EFFICIENCY vs. LOAD CURRENT—HIGH-EFFICIENCY AND LOW-NOISE MODES

(VOUT = 5V)

MAX710/711

TOC04EFFICIENCY vs. LOAD CURRENT—HIGH-EFFICIENCY AND LOW-NOISE MODES

(VOUT = 3.3V)

HIGH-EFFICIENCY MODEILIM = 0.8A80EFFICIENCY

(%)ILIM = 1.5AILIM = 0.8A70

ILIM = 1.5A60

LOW-NOISE MODEVOUT = 3.3VVIN = 2.5V50

MAX710/711

TOC05NO-LOAD BATTERY CURRENT

vs. INPUT VOLTAGE

1400SUPPLY

CURRENT

(µA)

ILIM = GND (1.5A)6004002000

0

ILIM = PS (0.8A)2

4

6

8

10

12

N/E = GNDMAX710/711

TOC06MAX710/711

TOC0990

N/E = GND80EFFICIENCY

(%)ILIM = 1.5AILIM = 0.8A901600

70

N/E = PS60

VOUT = 5VVIN = 2.5V50

0.1

1

10

100

1000

LOAD CURRENT (mA)

0.

LOAD CURRENT (mA)INPUT VOLTAGE (V)

MAXIMUM OUTPUT CURRENT

vs. INPUT VOLTAGE

MAX710/711

TOC07LINEAR-REGULATOR POWER-SUPPLY REJECTION RATIO vs. FREQUENCY

555045PSRR

(dB)40353025

MAX710/711

TOC08SHUTDOWN CURRENTvs. INPUT VOLTAGE

1.0

1000

ILIM = GNDMAXIMUM

OUTPUT

CURRENT

(mA)60

ILIM = PS100

SHUTDOWN

CURRENT

(µA)0.8

0.6

0.4

N/E = GNDN/E = PS10

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

2.6

INPUT VOLTAGE (V)

201510

0.01

0.1

1

10

100

1000

FREQUENCY (kHz)

0.2

0

1

2

3

4

5

6

7

8

9

1011

INPUT VOLTAGE (V)

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3.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

____________________________Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)

LINE-TRANSIENT RESPONSE

LOAD-TRANSIENT RESPONSE

MAX710/711 TOC10MAX710/711 TOC11A

A

B

B

2ms/div

1ms/div

A: VOUT = 3.3V (100mV/div, AC COUPLED), N/E = GNDA: VOUT = 3.3V (50mV/div, AC COUPLED), N/E = PSB: VIN = 2V TO 4V, IOUT = 100mA

B: IOUT = 10mA TO 100mA

OUTPUT RIPPLE (HIGH-EFFICIENCY MODE)

OUTPUT RIPPLE (LOW-NOISE MODE)

MAX710/711 TOC12MAX710/711 TOC13200µs/div

200µs/div

VIN = 2.5V, IOUT = 20mA, N/E = GNDVIN = 2.5V, IOUT = 20mA, N/E = PSVOUT = 5V (20mV/div, AC COUPLED), IOUT = 20mA

VOUT = 5V (20mV/div, AC COUPLED), IOUT = 20mA

START-UP DELAY

TURN-OFF DELAY

MAX710/711 TOC14MAX710/711 TOC15AA

BB

20µs/div

200µs/div

A: VOUT (2V/div), IOUT = 100mAA: VOUT (2V/div), IOUT

= 100mA

B: VSHDN

(2V/div)B: VSHDN (2V/div)

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MAX710/MAX7113.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

MAX710/MAX711______________________________________________________________Pin DescriptionPINMAX710123456—141516MAX71112345—3141516NAMELXPGNDILIMSHDNSTBY3/5FBN/ELBOOUTLBI-LBI+PSREFGNDPGNDLXFUNCTIONDrain Connection for internal N-channel power MOSFETPower GroundInductor Current-Limit-Select Input. Connect to GND for 1.5A limit and to PS for 0.8A wn Input. When low, the entire circuit is off and OUT is actively pulled to y Input. Connect to GND to disable boost circuit. Connect to PS for normal s the output voltage. Connect to GND for 5V output and to OUT for 3.3V ck InputSelects low-noise or high-efficiency mode. Connect to GND for high efficiency and to PS forlowest noise. See

Operating Configurations

-Battery Comparator OutputLinear-Regulator Output. Bypass with a 4.7µF capacitor to ve Input to Low-Battery ComparatorPositive Input to Low-Battery ComparatorSource of internal PFET regulator. The IC is powered from PS.1.28V Reference Voltage Output. Bypass with a 0.1µF capacitor to Ground. Must be low impedance. Solder directly to ground GroundDrain Connection for internal N-channel power MOSFET_______________Detailed DescriptionThe MAX710/MAX711 integrate a step-up DC-DC con-verter with a linear regulator to provide step-up/downvoltage conversion. The step-up switch-mode regulatorcontains an N-channel power MOSFET switch. It alsoshares a precision voltage reference with a linear regu-lator that contains a P-channel MOSFET pass element(Figure 1).

input. The error amplifier compares this reference withthe selected feedback voltage and amplifies the differ-ence. The difference is conditioned and applied to theP-channel pass transistor’s gate.

Operating ConfigurationsThe MAX710/MAX711 have several operating configu-rations to minimize noise and optimize efficiency for dif-ferent input voltage ranges. These configurations areaccomplished via the N/Einput, which controls opera-tion of the on-chip linear regulator.

With N/Elow, the linear regulator behaves as a 0.7Ω(at5V output) PFET switch when the IC is boosting, and asa conventional linear regulator when VIN> VOUT. Thisprovides optimum boost efficiency, but the PFET doeslittle to reject boost-converter output ripple. With N/Ehigh, boost ripple rejection is optimized by maintainingheadroom (VFV, typically 0.5V at 5V output) across thelinear regulator. Boost mode efficiency is then about10% lower than with N/Ehigh.

Step-Up OperationA pulse-frequency-modulation (PFM) control schemewith a constant 1µs off-time and variable on-time con-trols the N-channel MOSFET switch. The N-channelswitch turns off when the part reaches the peak currentlimit or the 4µs maximum on-time. The ripple frequencyis a function of load current and input voltage.

Step-Down OperationThe low-dropout linear regulator consists of a refer-ence, an error amplifier, and a P-channel MOSFET. Thereference is connected to the error amplifier’s inverting

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_______________________________________________________________________________________

3.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

N/EVINVOUTERRORPSREF1AMP2LX∆tONVFIXED tOFFFVGENERATORDRVNOFFPSILIMMAX710100mVPGNDCURRENT-LIMIT COMPARATORPGNDERRORREF1AMP1PSREF2OUT(FB)SHDNREFAREF2REF3.3/5STBYREFBREF1LBI+GNDLBI-LBO( ) IS FOR 1. Functional Diagram_______________________________________________________________________________________

7

MAX710/MAX7113.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

MAX710/MAX711In high-efficiency mode (N/E= low), the maximuminput voltage is limited to voltage limitation iseasily overcome, however, by configuring the LBO out-put to change modes based on input voltage, allowingan 11V maximum input with high-efficiency configura-tions. Four operating configurations are described inTable 1 and in the following subsections.

Configuration 1: High Efficiency, 7V Max VINWith N/Econnected to GND, when the IC boosts, thelinear regulator operates only as a switch, with mini-mum forward drop, until VIN> VOUT(where linear regu-lation begins). This configuration is limited to no morethan 7V input, but provides best efficiency for battery-only operation or low-voltage AC adapter uration 2: High Efficiency, VBATT< VOUTIn this configuration, N/Eis driven high by LBO whenVIN> VOUT(Figure 2a). When VIN< VOUT, the ICboosts, and the linear regulator operates as a switch,with minimum forward drop. When VIN> VOUT, the lin-ear regulator operates with VFVforward drop, while VPSincreases by VFVso that OUT maintains regulation. VFVis set inside the IC to approximately 0.5V (at 5V VOUT).When VINis only slightly higher than VOUT, conversionefficiency is poorer than in configuration 1, so configu-ration 2 is most suitable when the battery voltage is lessthan VOUT, but the AC adapter output is greater thanVOUT.

Table 1. Operating Configurations

NO.1DESCRIPTIONHigh efficiency,7V max VINHigh efficiency,VBATT< VOUT(Figure 2a)High efficiency,11V, VBATT< 6.5V(Figure 2b)Low noiseINPUTVOLTAGEUp to 7VCONNECTIONSN/E= GNDLBO = N/ELBI- = VOUTLBI+ = VINLBO = N/ELBI- = REFLBI+ = R5, R6N/E= PS2Up to 11V34Up to 11VUp to 11VVIN = +1.8V TO +11VVIN = +1.8V TO +11V100µF100µFL1SHDNSTBYN/ELBOLBI+LBI-REFPGND0.1µFGND3/5ILIMLXPSOUT100µFL1SHDNSTBYR5N/ELBOLBI+R6LBI-REF0.1µFPGNDGND3/5ILIM (VIN - VREF)R5 = R6 VREFR5 = R6 (4.08)WHEN VREF = 1.28VAND VIN = 6.5VLXPSOUT100µFMAX7104.7µFMAX7104.7µFFigure 2a. High-Efficiency Operating Configuration for

VBATT< VOUT8

Figure 2b. High-Efficiency Operating Configuration for

VBATT< 6.5V_______________________________________________________________________________________

3.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

Configuration 3: High Efficiency, 11V, VBATT< 6.5VIn this configuration, N/Eis driven high by LBO whenVIN> 6.5V (Figure 2b). When VIN< VOUT, the ICINboosts, and the linear regulator operates as a switch,with minimum forward drop. When VC1L1> 6.5V (set by R5 and R6),IN> VOUT, linearregulation begins. When VONthe linear regulator forces a minimum forward drop ofINOFFVSHDNLXFV(typically 0.5V at 5V VOUT) as LBO drives N/E transition is not seen at the output, since the linearSTBYPSC2regulator already has an input-output voltage differenceof 6.5V - 5V. Efficiency with VINslightly higher thanR3N/EOUTVOUTis equal to that of configuration 1, so configura-tion 3 is most suitable when the battery voltage may beLBOMAX711R1C4near VOUT. This hookup has no functional shortcomingsLBI+compared with configuration 2, except that two addi-FBtional resistors (R5 and R6) are needed.

R4LBI-R2Configuration 4: Low NoiseREFWith N/Econnected to PS, when the IC is boosting, thelinear regulator operates with VFVforward voltage (typi-PGNDGNDILIMcally 0.5V at 5V VLinear regulation occurs when VOUT) for optimum noise e differential results in boost efficiency typi-IN> VOUT+ VFV. TheVcally 10% lower than with the high-efficiency configura-FVtions.

Figure 3. MAX711 Adjustable Output VoltageILIMThe current-limit-select input, ILIM, selects between thetwo peak current limits: 1.5A (ILIM = GND) and 0.8AMAX710/MAX711 typically start up with a 1V input. If(ILIM = PS). If the application requires 200mA or lessthe battery voltage exceeds the programmed outputfrom the MAX710/MAX711, select 0.8A. The lower peakvoltage, the output will linear regulate down to thecurrent limit permits the use of smaller, low-cost induc-selected output voltage.

tors. The ILIM input is internally diode clamped to GNDThe MAX711’s adjustable output voltage is set by twoand PS, and should not be connected to signals out-resistors, R1 and R2 (Figure 3), which form a voltageside this range.

divider between the output and FB. Use the followingequation to determine the resistor values:

Shutdown and Standby ModesGrounding SHDNturns off the MAX710/MAX711 com-R1 = R2 [(VOUT/VREF) - 1]

pletely, disconnecting the input from the output. Tiewhere VREF= 1.25V.

SHDN to PS for normal operation.

Since the input bias current at FB has a maximum valueThe MAX710/MAX711 have a standby mode that shutsof 50nA, R1 and R2 can be large with no significantdown the step-up converter. The linear regulatoraccuracy loss. Choose R2 in the 100kΩto 1MΩrangeremains on with a 7µA (typ) LDO quiescent calculate R1 using the formula above. For 1%Connect STBYto ground to enter standby mode; other-error, the current through R1 should be at least 100wise, connect STBYto PS.

times FB’s bias current.

__________________Design ProcedureLow-Battery Comparator

The MAX710/MAX711 contain a comparator for low-Output Voltage Selectionbattery detection. If the voltage at LBI+ falls below thatFor the MAX710, you can obtain a 3.3V or 5V outputat LBI- (typically connected to REF), LBO goes e by tying 3/5to GND or PS. Efficiency is typicallyHysteresis is typically 50mV. Set the low-battery moni-85% over a 2mA to 250mA load range. The device istor’s threshold with two resistors, R3 and R4 (Figure 2),bootstrapped, with power derived from the step-upusing the following equation:

voltage output (at PS). Under all load conditions, the

R3 = R4 [(VLBT/ VLBI-) - 1]

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MAX710/MAX7113.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

MAX710/MAX711Table 2. Component Selection

INDUCTORS (L1)Sumida CD75-220 (1.5A),CDRH-74-220 (1.23A), orCD54-220Coilcraft DO33-08P-223CAPACITORS100µF, 16V low-ESR tantalum capacitorAVX TPSE107M016R0100 orSprague 593D107X0016E2W4.7µF, 16V tantalum capacitorSprague 595D475X0016A2TRECTIFIERS (D1)Schottky diodeMotorola MBRS130T3where VLBTis the desired threshold of the low-batterydetector and VLBI-is the voltage applied to the invert-ing input of the low-battery comparator. Since LBI cur-rent is less than 50nA, R3 and R4 can be large(typically 100kΩto 1MΩ), minimizing input supply load-ing. If the low-battery comparator is not used, connectLBI+ to PS and LBI- to REF, leaving LBO unconnected.

useful for operation at cold temperatures. The outputcapacitor, C3, needs to be only 4.7µF to maintain linearregulator stability. See Tables 2 and 3 for a list of sug-gested capacitors and suppliers.

Rectifier Diode

For optimum performance, use a switching Schottkydiode. Refer to Tables 2 and 3 for the suggested diodeand supplier.

Inductor SelectionA 22µH inductor value performs well in mostMAX710/MAX711 applications. The inductance value isnot critical, however, since the MAX710/MAX711 workwith inductors in the 18µH to 100µH range. Smallerinductance values typically offer a smaller size for agiven series resistance, allowing the smallest overallcircuit dimensions. Circuits using larger inductance val-ues exhibit higher output current capability and largerphysical dimensions for a given series resistance. Theinductor’s incremental saturation current rating shouldbe greater than the peak switch-current limit, which is1.5A for ILIM = GND and 0.8A for ILIM = PS. However,it is generally acceptable to bias most inductors intosaturation by as much as 20%, although this slightlyreduces efficiency. The inductor’s DC resistance signif-icantly affects efficiency. See Tables 2 and 3 for a list ofsuggested inductors and suppliers.

__________Applications InformationThe MAX710/MAX711 high-frequency operation makesPC layout important for minimizing ground bounce andnoise. Keep the IC’s GND pin and the ground leads ofC1 and C2 (Figure 1) less than 0.2in. (5mm) apart. Alsokeep all connections to the FB and LX pins as short aspossible. To maximize output power and efficiency andminimize output ripple voltage, use a ground plane andsolder the IC’s GND pin directly to the ground plane.

Table 3. Component SuppliersSUPPLIERAVXCoilcraftMotorolaSanyoSpragueSumidaPHONE(803) 946-0690(847) 639-6400(602) 303-5454(619) 661-6835(603) 224-1961(847) 956-0666FAX(803) 626-3123(847) 639-1469(602) 994-6430(619) 661-1055(603) 224-1430(847) 956-0702Capacitor SelectionA 100µF, 16V, 0.1Ωequivalent series resistance (ESR),surface-mount tantalum (SMT) output filter capacitor,C2, typically exhibits 50mV output ripple when steppingup from 2V to 5V at 100mA. Smaller capacitors (downto 10µF with higher ESRs) are acceptable for light loadsor in applications that can tolerate higher output ESR of both bypass and filter capacitors affectsefficiency and output ripple. Output voltage ripple is theproduct of the peak inductor current and the outputcapacitor’s ESR. Use low-ESR capacitors for best per-formance, or connect two or more filter capacitors inparallel. Low-ESR, SMT capacitors are currently avail-able from Sprague (595D series) and AVX (TPS series).Sanyo OS-CON organic-semiconductor through-holecapacitors also exhibit very low ESR and are especially

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___________________Chip InformationTRANSISTOR COUNT: 661SUBSTRATE CONNECTED TO GND

______________________________________________________________________________________

3.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

________________________________________________________Package Information______________________________________________________________________________________11

MAX710/MAX7113.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

MAX710/MAX711NOTES

12______________________________________________________________________________________