MAX1710 Evaluation MAX1710 evaluation kit) demonstrates data shee

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MAX1710 Evaluation MAX1710 evaluation kit) demonstrates data shee

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19-4781; 5/00
MAX1710 Evaluation
MAX1710 evaluation kit) demonstrates data sheet's standard notebook application circuit (see MAX1710/MAX1711 data sheet). This DC-DC converter steps down high-voltage batteries and/or adapters, generating precision, low-voltage core rail. circuit designed battery range, accommodates from 4.5V 24V. Some parameters, such load-transient response maximum thermal load capability, degraded going outside range. continuous output current rating, based worst-case MOSFET RDS(ON), heat sinking, other thermal stress issues, 5.5A +70°C. This fully assembled tested circuit board. also allows evaluation MAX1711.
Features
High Speed, Accuracy, Efficiency Fast-Response QUICK-PWMArchitecture Input Voltage Range 1.25V Output Voltage Range Peak Load-Current Capability (5.5A Continuous) Efficient (VOUT VBATT ILOAD 300kHz Switching Frequency Current-Sense Resistor Remote VOUT Sensing Power-Good Output 24-Pin QSOP Package Low-Profile Components Fully Assembled Tested
Evaluates: MAX1710/MAX1711
Ordering Information
PART MAX1710EVKIT TEMP. RANGE +70°C PACKAGE QSOP
NOTE: evaluate MAX1711, request MAX1711EEG free sample with MAX1710 Kit.
Component List
DESIGNATION C1-C4 DESCRIPTION 4.7µF, ceramic capacitors Taiyo Yuden TMK325BJ475K C1-C4 (ALTERNATE) 10µF, ceramic capacitors Tokin C34Y5U1E106Z United Chemi Con/Marcon THCR50E1E106ZT 470µF, 6.3V, low-ESR tantalum capacitors Kemet T510X477M006AS 10µF, 6.3V ceramic capacitor Taiyo Yuden JMK325BJ106MN C3225X5R1A106M 0.1µF ceramic capacitor 0.22µF ceramic capacitors 470pF ceramic capacitor ceramic capacitor installed Schottky diode SGS-Thomson STPS2L25U Nihon EC31QS03L 100mA Schottky diode Central Semiconductor CMPSH-3 Hitachi HRB0103A DESIGNATION DESCRIPTION Schottky diode Motorola MBRS130LT3, Nihon EC10QS03, International Rectifier 10BQ040 Hitachi HRF22 200mV switching diode Central Semiconductor CMPD2838 power inductor Panasonic ETQP6F2R0HFA, Coiltronics UP4B-2R2, Coilcraft DO5022P-222HC N-channel MOSFET International Rectifier IRF7807, Fairchild FDS6612A, Siliconix Si4416DY N-channel MOSFET International Rectifier IRF7805,or Fairchild FDS6670A, uPA1706, Hitachi HAT2040R resistor
C11, C16, C17,
QUICK-PWM trademark Maxim Integrated Products.
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800 small orders, phone 1-800-835-8769.
MAX1710 Evaluation Evaluates: MAX1710/MAX1711
Component List (continued)
DESIGNATION R10, JU1, None None None DESCRIPTION resistors 100k, resistor installed resistor resistor MAX1710EEG (24-QSOP) 2-pin headers Shunt (JU1) DIP-8 switch Digi-Key CT2084-ND Momentary switch, normally open Digi-Key P8006/7S Scope-probe connector Berg Electronics 33JR135-1 MAX1710 board MAX1710/MAX1711 data sheet
Equipment Needed
24V, >20W power supply, battery, notebook adapter bias power supply, 100mA Dummy load capable sinking Digital multimeter (DMM) 100MHz dual-trace oscilloscope
Quick Start
Ensure that circuit connected correctly supplies dummy load prior applying power. Ensure that shunt connected (SHDN VCC). Turn battery power prior bias power; otherwise, output UVLO timer will time fault latch will set, disabling regulator until power cycled shutdown toggled. Observe output with and/or oscilloscope. Look switching-node MOSFET gate-drive signals while varying load current. Don't change code without cycling bias power; otherwise, output voltage ramp will probably bump into over- undervoltage protection thresholds latch circuit off. this happens, just cycle power press RESET button. switch Table desired output voltage.
Component Suppliers
SUPPLIER Central Semiconductor Coilcraft Coiltronics Dale-Vishay Fairchild Hitachi International Rectifier Kemet Motorola Nihon Panasonic Sanyo SGS-Thomson Siliconix Sumida Taiyo Yuden Tokin PHONE 516-435-1110 708-639-6400 561-241-7876 402-564-3131 408-721-2181 888-777-0384 310-322-3331 512-992-7900 408-986-0424 602-303-5454 408-588-6000 847-843-7500 714-373-7939 619-661-6835 617-259-0300 408-988-8000 708-956-0666 408-573-4150 847-390-4373 408-432-8020 516-435-1824 708-639-1469 561-241-9339 402-563-6418 408-721-1635 650-244-7947 310-322-3332 512-992-3377 408-986-1442 602-994-6430 408-588-6130 847-843-2798 714-373-7183 619-661-1055 617-259-9442 408-970-3950 708-956-0702 408-573-4159 847-390-4428 408-434-0375
Detailed Description
This buck-regulator design optimized 300kHz frequency output voltage settings around 1.6V. lower output voltages, transient response degraded slightly efficiency worsens. higher output voltages (approaching 2V), output ripple reflected input ripple increase. board layout deliberately includes long output power ground buses order facilitate evaluation remote sense circuitry provide plenty experimentation space soldering different types output filter capacitors. These buses also useful introducing small amounts parasitic trace resistance necessary when using capacitors having highfrequency zeros (see All-Ceramic-Capacitor Application section MAX1710/MAX1711 data sheet). Position experimental ceramic capacitors different places along length buses effect different amounts ESR.
MAX1710 Evaluation
Table MAX1710/1711 Output Voltage Adjustment Settings
OUTPUT VOLTAGE 2.00 1.95 1.90 1.85 1.80 1.75 1.70 1.65 1.60 1.55 1.50 1.45 1.40 1.35 1.30 1.25
generator duty cycle (10%) minimize heat stress MOSFET. Vary high-level output voltage pulse generator vary load current. determine load current, might expect insert meter load path, this method prohibited here need resistance inductance path dummy-load MOSFET. There easy alternative methods determine much load current particular pulse-generator amplitude causing. first best observe inductor current with calibrated current probe, such Tektronix AM503. buck topology, load current equal average value inductor current. second method first static dummy load measure battery current. Then, connect MOSFET dummy load 100% duty momentarily, adjust gate-drive signal amplitude until battery current rises appropriate level (the MOSFET load must well heatsinked this work without causing smoke flames).
Evaluates: MAX1710/MAX1711
Efficiency Measurements
Testing power conversion efficiency POUT/PIN fairly accurately requires more careful instrumentation than might expected. common error inaccurate DMMs. Another only DMM, move from spot another measure various input/output voltages currents. This second error usually results changing exact conditions applied circuit series resistance ammeters. It's best four 3-1/2 digit better DMMs that have been recently calibrated, monitor VBATT, VOUT, IBATT, ILOAD simultaneously, using separate test leads directly connected input output board terminals. Note that it's inaccurate test efficiency remote VOUT ground terminals, this incorporates parasitic resistance board output ground buses measurement significant power loss). Remember include power consumed bias supply when making efficiency calculations: Efficiency VOUT LOAD (VBATT BATT BIAS
Setting Output Voltage
Select output voltage using D0-D3 pins. MAX1710/MAX1711 uses internal feedback resistor voltage-divider. output voltage digitally from 1.25V 50mV increments, using D0-D3 inputs. Switch sets desired output voltage (Table
Load-Transient Measurement
interesting experiment subject output large, fast load transients observe output with oscilloscope. This necessitates careful instrumentation output, using supplied scope-probe jack. Accurate measurement output ripple load-transient response invariably requires that ground clip leads completely avoided that probe removed expose shield, probe plugged directly into jack. Otherwise, noise pickup will corrupt waveforms. Most benchtop electronic loads intended power-supply testing lack ability subject DC-DC converter ultra-fast load transients. Emulating supply current VCORE pins requires least 10A/µs load transients. easy method generating such abusive load transient solder MOSFET, such MTD3055 12N05, directly across scope-probe jack then drive gate with strong pulse
choice MOSFET large impact efficiency performance. International Rectifier MOSFETs used were leading-edge performance application time this designed. However, pace MOSFET improvement rapid, latest offerings should evaluated.
MAX1710 Evaluation Evaluates: MAX1710/MAX1711
Jumper Switch Settings
Table Jumper Functions (Shutdown Mode)
SHUNT LOCATION SHDN Connected Connected MAX1710 OUTPUT MAX1710 enabled Shutdown mode, VOUT
Table Jumper Functions (Fixed/Adj. Current-Limit Selection)
SHUNT LOCATION ILIM Connected CURRENT-LIMIT THRESHOLD 100mV (default)
Connected external resistor Refer Adjustable ILIM line between 50mV Description (MAX1710/ 200mV MAX1711 data sheet) information selecting
Table Jumper Functions (Low-Noise Mode)
SHUNT LOCATION SKIP Connected OPERATIONAL MODE Low-noise mode, forced fixedfrequency operation. Normal operation, allows automatic PWM/PFM switchover pulse skipping light load, resulting highest efficiency.
Table Jumpers JU7/JU10 Functions (GNDS Integrator Disable Selection)
JUMPER JU10 SHUNT LOCATION Connected Connected directly load GROUND REMOTE-SENSE Disables GNDS integrator GNDS internally connects integrator that fine-tunes ground offset voltage.
Connected
JU10
Table Jumpers JU8/JU9 Functions (FBS Integrator Disable Selection) Table Jumpers JU3/JU4/JU5 Functions (Switching-Frequency Selection)
JUMPER JU3, JU4, SHUNT LOCATION Connected Connected Connected Floating FREQUENCY (kHz) JUMPER SHUNT LOCATION Connected Connected VOUT directly load GROUND REMOTE-SENSE Disables main FBREF integrators internally connects integrator that fine-tunes output voltage.
IMPORTANT: Don't change operating frequency without first re-calculating component values, because frequency significant effect peak current-limit level, MOSFET heating, PFM/PWM switchover point, output noise, efficiency, other critical parameters.
Table Jumper JU11 Functions (Overvoltage Protection Disable)
SHUNT LOCATION Connected Connected OVERVOLTAGE PROTECTION disabled Normal operation, enabled.
MAX1710 Evaluation Evaluates: MAX1710/MAX1711
Table Troubleshooting Guide
SYMPTOM Circuit won't start when power applied. POSSIBLE PROBLEM Power-supply sequencing: bias supply applied first. Output overvoltage shorted high-side MOSFET. Output overvoltage load recovery overshoot Overload condition Circuit won't start when RESET pressed, bias supply cycled. Transient overload condition SOLUTION Press RESET button. Replace MOSFET. Reduce inductor value, raise switching frequency, more output capacitance. Remove excessive load raise ILIM threshold changing RLIM (R6). more low-ESR output capacitors.
Troubleshoot power stage. gate-drive signals present? VREF preBroken connection, MOSFET, sent? Exercising mode then SKIP other catastrophic problem. no-fault mode help decipher nature problem (see MAX1710/MAX1711 data sheet Description). VBATT power source poor impedance characteristic. On-time pulses erratic have unexpected changes period. Noise being injected into crossing +12.5% threshold -70% UVLO threshold fast response. bulk electrolytic bypass capacitor across benchtop power supply, substitute real battery. filter 100pF suggested) C18. This normal operating condition. desired, disable fault circuit input (JU11) raise threshold substituting MAX1711 MAX1710.
Circuit latches when code changed.
parasitic board trace resistance between Load-transient waveform shows excess Instability low-ESR ceramic LX-FB connection ceramic capacitor. ringing switching waveform exhibits placed across fast double-pulsing (pulses separated only feedback path (FB-GND). Substitute different capacitor type (OS-CON, tanby 500ns off-time). talum, aluminum electrolytic work well). Observe gate-source voltage during low-to-high node transition (this requires careful instrumentation). gate voltage being pulled above 1.5V, causing turn smaller low-side MOSFET higher-value resistor (R7). smaller high-side MOSFET more heatsinking.
Excessive EMI, poor efficiency high input voltages.
Gate-drain capacitance causing shoot-through crossconduction.
Poor efficiency high input voltages, gets hot.
excessive gate capacitance.
Evaluates: MAX1710/MAX1711
MAX1710 Evaluation
Figure MAX1710 Schematic
10µF 10µF CMPSH-3 470µF 6.3V 470µF 6.3V 0.1µF 470µF 6.3V CMPD2838 SCOPE JACK VBIAS SHDN SKIP 0.22µF 10µF 10µF VOUT OPEN 10µF 6.3V MBRS130LT3 OPEN GNDS JU10 GNDS PGOOD 100k SHORT OPEN
MAX1710
PGND SHORT 0.22µF FLOAT 300kHz 550kHz ILIM PGOOD
VBATT
RESET
SHDN
SKIP
SW1A
SW1B
SW1C
SW1D
470pF
400kHz
200kHz
OPEN
MAX1710 Evaluation Evaluates: MAX1710/MAX1711
1.0"
1.0"
1.0"
Figure Component Placement Guide -Component Side
Figure Board Layout-Internal Plane Layer
1.0"
1.0"
Figure Component Placement Guide-Solder Side
Figure Board Layout-Component Side
MAX1710 Evaluation Evaluates: MAX1710/MAX1711
1.0"
1.0"
Figure Board Layout-Internal Plane Layer
Figure Board Layout-Solder Side
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2000 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

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