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MAX8566ETJ+-MAX8566ETJ+T
High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator
General DescriptionThe MAX8566 high-efficiency switching regulator deliv-
ers up to 10A load current at output voltages from 0.6V
to (0.87 x VIN). The IC operates from 2.3V to 3.6V input
supplies, making it ideal for point-of-load applications.
The total output-voltage set error is less than ±1% over
load, line, and temperature.
The MAX8566 operates in pulse-width-modulation
(PWM) mode with a 250kHz to 2.4MHz switching fre-
quency range that is programmable by an external
resistor. The IC can be synchronized to an external
clock in the same frequency range using the SYNC
input. The high operating frequency minimizes the size
of external components. Using low-RDS(ON)n-channel
MOSFETs for both high- and low-side switches main-
tains high efficiency at both heavy-load and high-
switching frequencies.
The MAX8566 employs a voltage-mode control archi-
tecture with a high-bandwidth (> 10MHz) error amplifi-
er. The voltage-mode control architecture makes
switching frequencies greater than 1MHz possible,
achieving all-ceramic-capacitor designs to minimize PC
board space. The error amplifier works with Type 3
compensation to fully utilize the bandwidth of the high-
frequency switching to obtain fast transient response.
Adjustable soft-start time provides flexibility to minimize
input startup inrush current. An open-drain, power-
good (PWRGD) signal goes high when the output
reaches 90% of its regulation point.
The MAX8566 provides a SYNCOUT output to synchro-
nize a second MAX8566 or a second regulator switch-
ing 180°out-of-phase with the first to reduce the input
ripple current, which consequently reduces the input-
capacitance requirements. The MAX8566 also pro-
vides an external reference input (REFIN) for
output-tracking applications.
The MAX8566 is available in a 32-pin, 5mm x 5mm TQFN
package. The MAX8566 and all the required external
components fit into a footprint of less than 0.80in2.
ApplicationsASIC/CPU/DSP Core Voltages
POL Power Supplies
DDR Power Supplies
Base-Station Power Supplies
Fiber Power Supplies
Telecom Power Supplies
Network Power Supplies
FeaturesInternal 8mΩOn-Resistance MOSFETs10A Output PWM Step-Down Regulator±1% Output Accuracy over Load, Line, and
TemperatureOperates from 2.3V to 3.6V Input SupplyAdjustable Output from 0.6V to (0.87 x VIN)250kHz to 2.4MHz Adjustable Frequency or SYNCInputAllows All-Ceramic-Capacitor DesignSYNCOUT Drives 2nd Regulator 180°Out-of-PhasePrebiased or Monotonic Soft-StartProgrammable Soft-Start TimeOutput Tracking or SequencingSourcing and Sinking Output CurrentPower-Good Output32-Lead TQFN PackageREFIN for DDR-Termination Application
High-Efficiency, 10A, PWM
Internal-Switch Step-Down RegulatorMAX8566ETJ+
STEP-DOWN REGULATOR
TQFN 5mm x 5mm
REFIN
SYNC
FREQ
SYNCOUT
GND
VDDLSSININININ
PGNDPGND
PGND
PGND
PGNDLXLXLXBSTPWRGDCOMPMODE
POWER-GOOD
OUTPUT
MONOTONIC SS
SELECTION
PROGRAMMABLE
FREQUENCY
SYNC INPUT
SYSTEM
ENABLE
SYNC OUTPUT 180°
REFIN FOR
TRACKING
INPUT
2.25V TO 3.6V
OUTPUT
UP TO 10A
330nH/10A
2 x 22μF
6.3V
COMPENSATION
Typical Operating Circuit
Ordering Information19-3690; Rev 3; 3/11
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-PACKAGEMAX8566ETJ+ -40°C to +85°C 32 TQFN-EP*
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
MAX8566
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= VDD= VEN= 3.3V, VFB= 0.5V, VSYNC= 0V, TA
= 0°C to +85°C, typical values are at TA= +25°C, unless otherwise noted.)
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.
EN/SS, EN, IN, SYNC, VDD,
LSS, PWRGD to GND..........-0.3V to +4V (4.5V nonswitching)
SYNCOUT, SS, COMP, FB, REFIN,
FREQ to GND.........................................-0.3V to (VDD + 0.3V)
LX Current (Note 1).................................................-12A to +12A
BST to LX.................................-0.3V to +4V (4.5V nonswitching)
PGND to GND.......................................................-0.3V to +0.3V
Continuous Power Dissipation (TA= +85°C)
TQFN (derate 33.3mW/°C above +70°C)..................2666.7W
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
PARAMETERCONDITIONSMINTYPMAXUNITS
IN/VDDIN and VDD Voltage Range2.33.6V
LSS Voltage Range2.33.6V
Quiescent current, VFB = 0.7V0.72.2IN Supply CurrentfS = 1MHz, no load14mA
Quiescent current, VFB = 0.7V1.84VDD Supply CurrentfS = 1MHz, VLSS = VDD16mA
TA = +25°C50Total Shutdown Current into IN
and VDD
VIN = VDD = VLSS = (VBST - VLX) =
3.6V, VEN = 0VTA = 0°C to +85°C3µA
VDD rising2.02.2VDD Undervoltage-Lockout
Threshold
LX starts/stops switching, 2µs
deglitchVDD falling1.721.90V
BSTTA = +25°C10Shutdown Supply CurrentVIN = VDD = VBST = 3.6V, VLX =
3.6V or 0V, VEN = 0VTA = 0°C to +85°C0.05µA
PWM COMPARATORComparator Propagation Delay10mV overdrive20ns
COMPClamp Voltage, HighVIN = 2.3V to 3.6V, VFB = 0.7V1.802.02.15V
Slew Rate0.751.4V/µs
Shutdown ResistanceFrom COMP to GND, VEN = 0V30100Ω
ERROR AMPLIFIERFB Regulation VoltageVCOMP = 1V to 2V, VDD = 2.5V and 3.3V0.5940.60.606V
VDD = 2.3V to 2.6V0VDD -
1.65Error-Amplifier Common-Mode
Input Range
VDD = 2.6V to 3.6V0VDD -
Error-Amplifier Maximum Output0.8mA
Note 1:LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceed
the IC’s package power-dissipation limits.
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
ELECTRICAL CHARACTERISTICS (continued)(VIN= VDD= VEN= 3.3V, VFB= 0.5V, VSYNC= 0V, TA
= 0°C to +85°C, typical values are at TA= +25°C, unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITSFB Input Bias CurrentVFB = 0.7V, TA = +25°C40200nA
REFIN Input Bias CurrentVREFIN = 0.6V, TA = +25°C70250nA
VDD = 2.3V to 2.6V0VDD -
1.65REFIN Common-Mode Range
VDD = 2.6V to 3.6V0VDD -
LX (ALL PINS COMBINED)
VIN = VBST - VLX = 3.3V816On-Resistance, High SideILX = -2AVIN = VBST - VLX = 2.5V1220mΩ
VIN = VLSS = 3.3V816On-Resistance, Low SideILX = 2AVIN = VLSS = 2.5V1220mΩ
Current-Limit ThresholdVIN = 2.5V or 3.3V, high side121520A
VLX = 3.6V5200
Leakage CurrentVIN = 3.6V, VEN = 0V,
TA = +25°CVLX = 0V-200+5µA
RFREQ = 50kΩ0.811.2Switching FrequencyVIN = 2.5V or 3.3VRFREQ = 23.3kΩ1.722.3MHz
Minimum Off-TimeVIN = 2.5V or 3.3V5075ns
Maximum Duty CycleRFREQ = 50kΩ, VIN = 2.5V or 3.3V8795%
Minimum Duty CycleRFREQ = 50kΩ, VIN = 2.5V or 3.3V10%
RMS LX Output Current10A
ENABLE/SOFT-STARTEN Input Logic-Low Threshold0.40.7V
EN Input Logic-High Threshold1.651.90V
Monotonic start3045MODE Input ThresholdVDD = 2.3V to 3.6V
No monotonic start20
% of
VDD
EN, MODE Input CurrentVEN = VMODE = 0V or 3.6V, VDD = 3.6V, TA = +25°C0.011µA
Soft-Start Charging CurrentVSS = 0.3V5811µA
SS Discharge Resistance8kΩ
MAX8566
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
ELECTRICAL CHARACTERISTICS (continued)(VIN= VDD= VEN= 3.3V, VFB= 0.5V, VSYNC= 0V, TA
= 0°C to +85°C, typical values are at TA= +25°C, unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
SYNCCapture RangeVDD = 2.3V to 3.6V0.252.40MHz
tLO100Pulse WidthVDD = 2.3V to 3.6VtHI100ns
VIH0.40.95Input ThresholdVDD = 2.3V to 3.6VVIL11.6V
IIH-1+10Input CurrentVSYNC = 0V or 3.6V, VDD = 3.6VIIL, TA = +25°C-1+0.01+1µA
SYNCOUTFrequency RangeVDD = 2.3V to 3.6V0.252.40MHz
Phase Shift from SYNC or
Internal OscillatorFrequency = 1MHz160180230D eg r ees
VOHVDD -
VDD -
0.05Output VoltageISYNCOUT = ±1mA,
VDD = 2.3V to 3.6V
VOL0.050.4
THERMAL SHUTDOWNThermal-Shutdown ThresholdWhen LX stops switching+165°C
Thermal-Shutdown Hysteresis20°C
POWER GOODThreshold VoltageVFB falling, 3mV hysteresis869093
% of
VREFIN
or 0.6V
Falling-Edge Deglitch305080µs
Output Low VoltageIPWRGD = 4mA0.150.3V
Leakage CurrentVPWRGD = 3.6V, VFB = 0.9V, TA = +25°C0.011µA
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
ELECTRICAL CHARACTERISTICS(VIN= VDD= VEN= 3.3V, VFB= 0.5V, VSYNC= 0V, TA
= -40°C to +85°C, unless otherwise noted. Note 2)
PARAMETERCONDITIONSMINTYPMAXUNITS
IN/VDDIN and VDD Voltage Range2.3253.600V
LSS Voltage Range2.3253.600V
IN Supply CurrentQuiescent current, VFB = 0.7V2.2mA
VDD Supply CurrentQuiescent current, VFB = 0.7V4mA
VDD rising2.2VDD Undervoltage-Lockout
Threshold
LX starts/stops switching,
2µs rising/falling-edge delayVDD falling1.72V
COMPClamp Voltage, HighVIN = 2.3V to 3.6V, VFB = 0.7V1.802.18V
Slew Rate0.75V/µs
Shutdown ResistanceFrom COMP to GND, VEN = 0V100Ω
ERROR AMPLIFIERFB Regulation VoltageVCOMP = 1V to 2V, VIN = 2.3V or 3.6V0.5910.609V
VDD = 2.325V to 2.6V0VDD -
1.65Error-Amplifier Common-Mode
Input RangeVDD = 2.6V to 3.6V0VDD -
Error-Amplifier Maximum Output
Current0.8mA
VDD = 2.325V to 2.5V0VDD -
REFIN Common-Mode Range
VDD = 2.6V to 3.6V0VDD -
LX (ALL PINS COMBINED)
VIN = VBST - VLX = 3.3V16On-Resistance, High SideILX = -2AVIN = VBST - VLX = 2.5V20mΩ
VIN = VLSS = 3.3V15On-Resistance, Low SideILX = 2AVIN = VLSS = 2.5V20mΩ
Current-Limit ThresholdVIN = 2.5V or 3.3V1220A
MAX8566
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
ELECTRICAL CHARACTERISTICS (continued)(VIN= VDD= VEN= 3.3V, VFB= 0.5V, VSYNC= 0V, TA
= -40°C to +85°C, unless otherwise noted. Note 2)
PARAMETERCONDITIONSMINTYPMAXUNITSRFREQ = 50kΩ0.81.2Switching FrequencyVIN = 2.5V or 3.3VRFREQ = 23.3kΩ1.72.3MHz
Minimum Off-TimeVIN = 2.5V or 3.3V90ns
Maximum Duty CycleRFREQ = 50kΩ, VIN = 2.5V or 3.3V87%
RMS Output Current10A
ENABLE/SOFT-STARTEN Input Logic-Low Threshold0.7V
EN Input Logic-High Threshold1.65V
Monotonic start3045MODE Input ThresholdVIN = 2.3V to 3.6VNo monotonic start20
% of
VDD
EN, MODE Input CurrentVEN or VMODE = 0V or 3.6V, VDD = 3.6V1µA
Soft-Start Charging CurrentVSS = 0.3V512µA
SYNCCapture RangeVIN = 2.3V to 3.6V0.252.40MHz
tLO100Pulse WidthVIN = 2.3V to 3.6VtHI100ns
VIH0.4Input ThresholdVIN = 2.3V to 3.6VVIL1.6V
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
Note 2:Specifications to -40°C are guaranteed by design and not production tested.
ELECTRICAL CHARACTERISTICS (continued)(VIN= VDD= VEN= 3.3V, VFB= 0.5V, VSYNC= 0V, TA
= -40°C to +85°C, unless otherwise noted. Note 2)
PARAMETERCONDITIONSMINTYPMAXUNITS
SYNCOUTFrequency RangeVDD = 2.3V to 3.6V0.252.40MHz
Phase Shift from SYNC or
Internal OscillatorFrequency = 1MHz160230Degrees
VOHVDD -
0.4Output VoltageISYNCOUT = ±1mA,
VDD = 2.3V to 3.6V
VOL0.4
POWER-GOODThreshold VoltageVFB falling, 3mV hysteresis8593% of
VREF
Fal l i ng - E d g e D eg l i tch3080µs
PWRGD Output VoltageIPWRGD = 4mA0.3V
Typical Operating Characteristics(Typical values are at VIN= VDD= 3.3V, VOUT= 1.8V, RFREQ= 50kΩ, IOUT= 10A, and TA= +25°C.)
EFFICIENCY vs. LOAD CURRENT
VIN = VLSS = 3.3VMAX8566 toc01
LOAD CURRENT (A)
EFFICIENCY (%)1
VOUT = 2.5V
VOUT = 1.8V
EFFICIENCY vs. LOAD CURRENT
VIN = VLSS = 2.5VMAX8566 toc02
LOAD CURRENT (A)
EFFICIENCY (%)1
VOUT = 1.8V
VOUT = 1.5V
EFFICIENCY vs. LOAD CURRENT
VIN = 2.5V, VLSS = 3.3VMAX8566 toc03
LOAD CURRENT (A)
EFFICIENCY (%)1
VOUT = 1.8V
VOUT = 1.5V
VOUT = 0.8V
MAX8566
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulatorypical Operating Characteristics (continued)(Typical values are at VIN= VDD= 3.3V, VOUT= 1.8V, RFREQ= 50kΩ, IOUT= 10A, and TA= +25°C.)
REFERENCE VOLTAGE vs. TEMPERATUREMAX8566 toc04
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)400
FREQUENCY vs. TEMPERATURE
MAX8566 toc05
TEMPERATURE (°C)
FREQUENCY (MHz)
RFREQ = 23.3kΩ
RFREQ = 50kΩ
RFREQ = 100kΩ
LOAD REGULATION
MAX8566 toc06
LOAD CURRENT (A)
OUTPUT VOLTAGE CHANGE (%)
VOUT = 2.5V
VOUT = 1.8V
VOUT = 0.8V1.01.50.52.02.53.03.54.0
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGEMAX8566 toc07
INPUT VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT (
VEN = 0V
MAXIMUM OUTPUT CURRENT
vs. OUTPUT VOLTAGE
MAX8566 toc08
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
EXPOSED PADDLE TEMPERATURE
vs. LOAD CURRENT
MAX8566 toc09
LOAD CURRENT (A)
EXPOSED PADDLE TEMPERATURE (
°C)
MAX8566 EV KIT PCB
200LFM
TA = +85°C
TA = +25°C
TA = -40°C
LINE REGULATION
MAX8566 toc10
OUTPUT VOLTAGE CHANGE (%)
ILOAD = 0A
ILOAD = 4.5A
ILOAD = 10A
OUTPUT SHORT-CIRCUIT CURRENT
vs. INPUT VOLTAGE
MAX8566 toc11
OUTPUT SHORT-CIRCUIT CURRENT (A)
High-Efficiency, 10A, PWM
Internal-Switch Step-Down RegulatorIOUT
(2A/div)
VOUT
AC-COUPLED
(50mV/div)
t = 10μs/div
LOAD TRANSIENT (0 TO 5A)MAX8566 toc13
(2A/div)
VOUT
(10mV/div)
VLX
(2V/div)
12A
10A
t = 400ns/div
FULL-LOAD SWITCHING WAVEFORMSMAX8566 toc14
IIN
(5A/div)
VEN
(2V/div)
VOUT
(1V/div)
VPWRGD
(2V/div)
(PEAK)
3.3V
1.8V
t = 400μs/div
STARTUP INTO 0.18Ω LOAD
(RLOAD = 0.18Ω)MAX8566 toc15
0dB
GAIN
(10dB/div)
PHASE
(45°/div)101001000
GAIN/PHASE OF THE VOLTAGE LOOPMAX8566 toc12
FREQUENCY (kHz)
56°
147 kHz
Typical Operating Characteristics (continued)(Typical values are at VIN= VDD= 3.3V, VOUT= 1.8V, RFREQ= 50kΩ, IOUT= 10A, and TA= +25°C.)
MAX8566
High-Efficiency, 10A, PWM
Internal-Switch Step-Down RegulatorIIN
(5A/div)
VREFIN
(500mV/div)
VOUT
(1V/div)
VPWRGD
(2V/div)
6.5A
0.6V
1.8V
t = 400μs/div
SOFT-START WITH REFINMAX8566 toc16
IIN
(AC-COUPLED)
(20mA/div)
IL1
(2A/div)
IL2
(2A/div)
VLX2
(5V/div)
VLX1
(5V/div)
3.3V
3.3V
t = 400ns/div
SYNCHRONIZED OPERATION (NO LOAD)MAX8566 toc17
SOFT-START TIME
vs. SOFT-START CAPACITANCE
MAX8566 toc18
CSS (μF)
SOFT-START TIME (ms)
t = 400μs/div
STARTUP INTO PREBIASED OUTPUT
(RLOAD = 0.18Ω)MAX8566 toc19
0.9V
IIN
(5A/div)
VEN
(12V/div)
VOUT
(1V/div)VPWRGD
(2V/div)
7.5A
(PEAK)
3.3V
1.8V
Typical Operating Characteristics (continued)(Typical values are at VIN= VDD= 3.3V, VOUT= 1.8V, RFREQ= 50kΩ, IOUT= 10A, and TA= +25°C.)
