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MAX5035DASA+T ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterEVALUATION KIT AVAILABLEMAX50351A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter
MAX5035DUPA ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterFeaturesThe MAX5035 easy-to-use, high-efficiency, high-volt- Wide 7.5V to 76V Input Voltage Rangea ..
MAX5035DUSA+ ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterApplicationsMAX5035BUSA 0°C to +85°C 8 SOMAX5035BUPA 0°C to +85°C 8 PDIPAutomotive5.0MAX5035BASA -4 ..
MAX5035DUSA+ ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterApplicationsMAX5035BUSA 0°C to +85°C 8 SOMAX5035BUPA 0°C to +85°C 8 PDIPAutomotive5.0MAX5035BASA -4 ..
MAX5037EMH ,4.75 to 5.5 V or 8 to 28 V, VRM 9.0, dual-phase, parallelable, average current-mode controllerApplications♦ Internal PLL with Clock Output for ParallelingServers and WorkstationsMultiple DC-DC ..
MAX5039EUA ,Voltage-Tracking Controllers for PowerPC, DSPs, and ASICsELECTRICAL CHARACTERISTICS(V = 2.5V to 5.5V, V = 2V, V = 1.8V, V = 2.5V, V = 1V, V = 2V (MAX5040 on ..
MAX921ESA+ ,Ultra Low-Power, Single/Dual-Supply ComparatorsMAX921–MAX92419-0115; Rev 6; 4/09Ultra Low-Power, Single/Dual-Supply Comparators_______________
MAX921MJA ,Ultra Low-Power, Single/Dual-Supply ComparatorsApplications5 HYSTBattery-Powered SystemsThreshold DetectorsMAX9216 REFWindow ComparatorsGNDV-21Osc ..
MAX9222EUM ,Programmable DC-Balance 21-Bit DeserializersELECTRICAL CHARACTERISTICS(V = +3.0V to +3.6V, V = +3.0V to +5.5V, PWRDWN = high, DCB/NC = high or ..
MAX9224ETI+ ,22-Bit, Low-Power, 5MHz to 10MHz Serializer and Deserializer ChipsetsFeaturesThe MAX9223/MAX9224 serializer/deserializer chipsets ♦ Ideal for Serializing Cell Phone LCD ..
MAX9225ETE ,10-Bit, Low-Power, 10MHz-to-20MHz Serializer and Deserializer ChipsetFeaturesThe MAX9225/MAX9226 serializer/deserializer chipset♦ Ideal for Serializing Cell Phone Camer ..
MAX922CSA ,Ultra Low-Power, Single/Dual-Supply ComparatorsFeaturesThe MAX921–MAX924 single, dual, and quad micro-' µMAX Package—Smallest 8-Pin SOpower, low-v ..


MAX5035AASA-MAX5035AASA+-MAX5035AUSA+-MAX5035BASA-MAX5035BASA+-MAX5035BASA+T-MAX5035CUPA+-MAX5035CUSA+-MAX5035DASA-MAX5035DASA+-MAX5035DASA+T-MAX5035DUSA+
1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter
AVAILABLE
EVALUATION KIT AVAILABLE
General Description

The MAX5035 easy-to-use, high-efficiency, high-volt-
age, step-down DC-DC converter operates from an
input voltage up to 76V and consumes only 270µA qui-
escent current at no load. This pulse-width modulated
(PWM) converter operates at a fixed 125kHz switching
frequency at heavy loads, and automatically switches
to pulse-skipping mode to provide low quiescent cur-
rent and high efficiency at light loads. The MAX5035
includes internal frequency compensation simplifying
circuit implementation. The device uses an internal low-
on-resistance, high-voltage, DMOS transistor to obtain
high efficiency and reduce overall system cost. This
device includes undervoltage lockout, cycle-by-cycle
current limit, hiccup mode output short-circuit protec-
tion, and thermal shutdown.
The MAX5035 delivers up to 1A output current. The out-
put current may be limited by the maximum power dis-
sipation capability of the package. External shutdown is
included, featuring 10µA (typ) shutdown current. The
MAX5035A/B/C versions have fixed output voltages of
3.3V, 5V, and 12V, respectively, while the MAX5035D/E
versions have an adjustable output voltage from 1.25V
to 13.2V.
The MAX5035 is available in space-saving 8-pin SO
and 8-pin plastic DIP packages and operates over the
automotive (-40°C to +125°C) temperature range.
Applications

Automotive
Consumer Electronics
Industrial
Distributed Power
Features
Wide 7.5V to 76V Input Voltage RangeFixed (3.3V, 5V, 12V) and Adjustable
(1.25V to 13.2V) Versions
1A Output CurrentEfficiency Up to 94%Internal 0.4ΩHigh-Side DMOS FET270µA Quiescent Current at No Load, 10µA
Shutdown Current
Internal Frequency CompensationFixed 125kHz Switching FrequencyThermal Shutdown and Short-Circuit Current
Limit
8-Pin SO and PDIP Packages
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
PARTTEMP RANGEPIN-
PACKAGE
OU TPU T
VO LTA GEV)

MAX5035AUSA0°C to +85°C8 SO
MAX5035AUPA0°C to +85°C8 PDIP
MAX5035AASA-40°C to +125°C8 SOAX 5035AAS A/V + -40°C to +125°C8 SO
MAX5035BUSA0°C to +85°C8 SO
MAX5035BUPA0°C to +85°C8 PDIP
MAX5035BASA-40°C to +125°C8 SOAX 5035BAS A/V + -40°C to +125°C8 SO
BST
SGND
TOP VIEW
VIN
GND
ON/OFF
MAX5035
SO/PDIP
Pin Configuration

MAX5035
GND
BST
VIN
SGND
50SQ100
100µHVOUT
VIN
7.5V TO 76V
68µF
0.1µF
0.1µF
68µF
OFF
ON/OFF
Typical Operating Circuit

/V denotes an automotive qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information continued at end of data sheet.

MAX5035
Ordering Information
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
ABSOLUTE MAXIMUM RATINGS

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.
(Voltages referenced to GND, unless otherwise specified.)
VIN.........................................................................-0.3V to +80V
SGND....................................................................-0.3V to +0.3V
LX.................................................................-0.8V to (VIN+ 0.3V)
BST...............................................................-0.3V to (VIN+ 10V)
BST (transient < 100ns)................................-0.3V to (VIN+ 15V)
BST to LX................................................................-0.3V to +10V
BST to LX (transient < 100ns)................................-0.3V to +15V
ON/OFF..................................................................-0.3V to +80V
VD...........................................................................-0.3V to +12V
MAX5035A/MAX5035B/MAX5035C...................-0.3V to +15V
MAX5035D/E......................................................-0.3V to +12V
VOUTShort-Circuit Duration (VIN≤40V)........................Indefinite
VD Short-Circuit Duration..............................................Indefinite
Continuous Power Dissipation (TA= +70°C)
8-Pin PDIP (derate 9.1mW/°C above +70°C)...............727mW
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
Operating Temperature Range
MAX5035_U_ _...................................................0°C to +85°C
MAX5035_A_ _..............................................-40°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow)
Lead(Pb)-free...............................................................+260°C
Containing lead(Pb).....................................................+240°C
ELECTRICAL CHARACTERISTICS (MAX5035_U_ _)

(VIN= +12V, VON/OFF= +12V, IOUT= 0, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C. See the
Typical Application Circuit.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

MAX5035A7.576.0
MAX5035B7.576.0
MAX5035C1576Input Voltage RangeVIN
MAX5035D/E7.576.0
Undervoltage LockoutUVLO5.2V
MAX5035AVIN = 7.5V to 76V,
IOUT = 20mA to 1A3.1853.33.415
MAX5035BVIN = 7.5V to 76V,
IOUT = 20mA to 1A4.855.05.15Output VoltageVOUT
MAX5035CVIN = 15V to 76V,
IOUT = 20mA to 1A11.641212.36
VIN = 7.5V to 76V, MAX5035D/E1.1921.2211.250Feedback VoltageVFBVIN = 7.5V to 76V, MAX5035E1.1851.2211.250V
VIN = 12V, ILOAD = 0.5A, MAX5035A86
VIN = 12V, ILOAD = 0.5A, MAX5035B90
VIN = 24V, ILOAD = 0.5A, MAX5035C94Efficiencyη
VIN = 12V, VOUT = 5V, ILOAD = 0.5A,
MAX5035D/E90
VFB = 3.5V, VIN = 7.5V to 76V, MAX5035A270440
VFB = 5.5V, VIN = 7.5V to 76V, MAX5035B270440
VFB = 13V, VIN = 15V to 76V, MAX5035C270440
VFB = 1.3V, MAX5035D270440
Quiescent Supply CurrentIQ
VFB = 1.3V, MAX5035E340460
Shutdown CurrentISHDNVON/OFF = 0V, VIN = 7.5V to 76V1045µA
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued) (MAX5035_U_ _)

(VIN= +12V, VON/OFF= +12V, IOUT= 0, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C. See the
Typical Application Circuit.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Switch Leakage CurrentIOLVIN = 76V, VON/OFF = 0V, VLX = 0V0.011µA
Switch On-ResistanceRDS(ON)ISWITCH = 1A0.400.80Ω
PFM ThresholdIPFMMinimum switch current in any cycle5585130mA
FB Input Bias CurrentIBMAX5035D/E-150+0.01+150nA
ON/OFF CONTROL INPUT

Rising trip point for MAX5035A/B/C/D1.531.691.85ON/OFF Input-Voltage ThresholdVON/OFFRising trip point for MAX5035E1.401.651.90V
ON/OFF Input-Voltage HysteresisVHYST100mV
ON/OFF Input CurrentION/OFFVON/OFF = 0V to VIN10150nA
ON/OFF Operating Voltage
RangeVON/OFF76V
OSCILLATOR

Oscillator FrequencyfOSC109125135kHz
Maximum Duty CycleDMAXMAX5035D/E95%
VOLTAGE REGULATOR

Regulator Output VoltageVDVIN = 8.5V to 76V, IL = 06.97.88.8V
Dropout Voltage7.5V ≤ VIN ≤ 8.5V, IL = 1mA2.0V
Load Regulation∆VD/∆IVD0 to 5mA150Ω
PACKAGE THERMAL CHARACTERISTICS

SO package (JEDEC 51)170Thermal Resistance
(Junction to Ambient)θJADIP package (JEDEC 51)110°C/W
THERMAL SHUTDOWN

Thermal-Shutdown Junction
TemperatureTSH+160°C
Thermal-Shutdown HysteresisTHYST20°C
ELECTRICAL CHARACTERISTICS (MAX5035_A_ _)

(VIN= +12V, VON/OFF= +12V, IOUT= 0, TA= TJ= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See
the Typical Application Circuit.) (Note 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

MAX5035A7.576.0
MAX5035B7.576.0
MAX5035C1576Input Voltage RangeVIN
MAX5035D/E7.576.0
Undervoltage LockoutUVLO5.2V
MAX5035AVIN = 7.5V to 76V,
IOUT = 20mA to 1A3.1853.33.415
MAX5035BVIN = 7.5V to 76V,
IOUT = 20mA to 1A4.8255.05.175Output VoltageVOUT
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
ELECTRICAL CHARACTERISTICS (MAX5035_A_ _) (continued)

(VIN= +12V, VON/OFF= +12V, IOUT= 0, TA= TJ= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See
the Typical Application Circuit.) (Note 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

VIN = 7.5V to 76V, MAX5035D1.1921.2211.250Feedback VoltageVFBVIN = 7.5V to 76V, MAX5035E1.1851.2211.250V
VIN = 12V, ILOAD = 0.5A, MAX5035A86
VIN = 12V, ILOAD = 0.5A, MAX5035B90
VIN = 24V, ILOAD = 0.5A, MAX5035C94Efficiencyη
VIN = 12V, VOUT = 5V, ILOAD = 0.5A,
MAX5035D/E90
VFB = 3.5V, VIN = 7.5V to 76V, MAX5035A270440
VFB = 5.5V, VIN = 7.5V to 76V, MAX5035B270440
VFB = 13V, VIN = 15V to 76V, MAX5035C270440
VFB = 1.3V, MAX5035D270440
Quiescent Supply CurrentIQ
VFB = 1.3V, MAX5035E340460
Shutdown CurrentISHDNVON/OFF = 0V, VIN = 7.5V to 76V1045µA
Peak Switch Current LimitILIM(Note 1)1.301.92.50A
VIN = 76V, VON/OFF = 0V, VLX = 0V1
Switch Leakage CurrentIOLVIN = 76V, VON/OFF = 0V, VLX = 0V,
MAX5035E5µA
Switch On-ResistanceRDS(ON)ISWITCH = 1A0.400.80Ω
PFM ThresholdIPFMMinimum switch current in any cycle5585130mA
FB Input Bias CurrentIBMAX5035D/E-150+0.01+150nA
ON/OFF CONTROL INPUT

Rising trip point for MAX5035A/B/C/D1.501.691.85ON/OFF Input-Voltage ThresholdVON/OFFRising trip point for MAX5035E1.401.651.90V
ON/OFF Input-Voltage HysteresisVHYST100mV
ON/OFF Input CurrentION/OFFVON/OFF = 0V to VIN10150nA
ON/OFF Operating Voltage
RangeVON/OFF76V
OSCILLATOR

Oscillator FrequencyfOSC105125137kHz
Maximum Duty CycleDMAXMAX5035D/E95%
VOLTAGE REGULATOR

Regulator Output VoltageVDVIN = 8.5V to 76V, IL = 06.57.89.0V
Dropout Voltage7.5V ≤ VIN ≤ 8.5V, IL = 1mA2.0V
Load RegulationΔVD/ΔIVD0 to 5mA150Ω
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
Typical Operating Characteristics

(VIN= 12V, VON/OFF= 12V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical
Application Circuit, if applicable.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
PACKAGE THERMAL CHARACTERISTICS

SO package (JEDEC 51)170Thermal Resistance
(Junction to Ambient)θJADIP package (JEDEC 51)110°C/W
THERMAL SHUTDOWN

Thermal-Shutdown Junction
TemperatureTSH+160°C
Thermal-Shutdown HysteresisTHYST20°C
Note 1:
Switch current at which current limit is activated.
Note 2:
All limits at -40°C are guaranteed by design, not production tested.
VOUT vs. TEMPERATURE
(MAX5035AASA, VOUT = 3.3V)

MAX5035 toc01
TEMPERATURE (°C)
OUT
(V)
IOUT = 0.1A
IOUT = 1A
VOUT vs. TEMPERATURE
(MAX5035DASA, VOUT = 5V)
MAX5035 toc02
TEMPERATURE (°C)
OUT
(V)
IOUT = 0.1A
IOUT = 1A
LINE REGULATION
(MAX5035AASA, VOUT = 3.3V)

MAX5035 toc03
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)503520
IOUT = 1A
IOUT = 0.1A
LINE REGULATION
(MAX5035DASA, VOUT = 5V)

MAX5035 toc04
OUTPUT VOLTAGE (V)502035
IOUT = 1A
IOUT = 0.1A
LOAD REGULATION
(MAX5035AASA, VOUT = 3.3V)

MAX5035 toc05
OUT
(V)
VIN = 7.5V, 24V
VIN = 76V
LOAD REGULATION
(MAX5035DASA, VOUT = 5V)

MAX5035 toc06
OUT
(V)
VIN = 76V
VIN = 24V
VIN = 7.5V
ELECTRICAL CHARACTERISTICS (MAX5035_A_ _) (continued)

(VIN= +12V, VON/OFF= +12V, IOUT= 0, TA= TJ= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See
the Typical Application Circuit.) (Note 2)
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
Typical Operating Characteristics (continued)

(VIN= 12V, VON/OFF= 12V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical
Application Circuit, if applicable.)
OUTPUT CURRENT LIMIT
vs. TEMPERATURE

MAX5035 toc10
TEMPERATURE (°C)
OUTPUT CURRENT LIMIT (A)
MAX5035DASA
VOUT = 5V
5% DROP IN VOUT
OUTPUT CURRENT LIMIT
vs. INPUT VOLTAGE

MAX5035 toc11
INPUT VOLTAGE (V)
OUTPUT CURRENT LIMIT (A)503520
MAX5035DASA
VOUT = 5V
5% DROP IN VOUT
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE

MAX5035 toc12
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT (
QUIESCENT SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX5035 toc13
QUIESCENT SUPPLY CURRENT (5646362616
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX5035 toc14
SHUTDOWN CURRENT (
SHUTDOWN CURRENT vs. INPUT VOLTAGE
MAX5035 toc15
SHUTDOWN CURRENT (5646362616
EFFICIENCY vs. LOAD CURRENT
(MAX5035AASA, VOUT = 3.3V)
MAX5035 toc07
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 76V
VIN = 48V
VIN = 24V
VIN = 12V
VIN = 7.5V
EFFICIENCY vs. LOAD CURRENT
(MAX5035DASA, VOUT = 5V)

MAX5035 toc08
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 76V
VIN = 48V
VIN = 24V
VIN = 12V
VIN = 7.5V
EFFICIENCY vs. LOAD CURRENT
(MAX5035DASA, VOUT = 12V)

LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 76V
VIN = 48V
VIN = 24V
VIN = 15V
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
Typical Operating Characteristics (continued)

(VIN= 12V, VON/OFF= 12V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical
Application Circuit, if applicable.)
OUTPUT VOLTAGE
vs. INPUT VOLTAGE

MAX5035 toc16
VIN (V)
OUT
(V)963
IOUT = 0
IOUT = 0.3A
IOUT = 1A
MAX5035DASA
VOUT = 12V
VON/OFF = VIN
MAX5035DASA
LOAD-TRANSIENT RESPONSE

MAX5035 toc17
400μs/div
A: VOUT, 200mV/div, AC-COUPLED
B: IOUT, 500mA/div, 0.1A TO 1A
VOUT = 5V
MAX5035DASA
LOAD-TRANSIENT RESPONSE

MAX5035 toc18
400μs/div
A: VOUT, 200mV/div, AC-COUPLED
B: IOUT, 500mA/div, 0.5A TO 1A
VOUT = 5V
MAX5035DASA
LOAD-TRANSIENT RESPONSE

MAX5035 toc19
400μs/div
A: VOUT, 200mV/div, AC-COUPLED
B: IOUT, 500mA/div, 0.1A TO 0.5A
VOUT = 5V
MAX5035DASA LX WAVEFORMS

MAX5035 toc20
4μs/div
A: SWITCH VOLTAGE (LX PIN), 20V/div (VIN = 48V)
B: INDUCTOR CURRENT, 500mA/div (IOUT = 1A)
MAX5035DASA LX WAVEFORMS

MAX5035 toc21
4μs/div
A: SWITCH VOLTAGE (LX PIN), 20V/div (VIN = 48V)
B: INDUCTOR CURRENT, 200mA/div (IOUT = 100mA)
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
Typical Operating Characteristics (continued)

(VIN= 12V, VON/OFF= 12V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical
Application Circuit, if applicable.)
MAX5035DASA LX WAVEFORMS

MAX5035 toc22
4μs/div
A: SWITCH VOLTAGE (LX PIN), 20V/div (VIN = 48V)
B: INDUCTOR CURRENT, 200mA/div (IOUT = 0)
MAX5035DASA STARTUP WAVEFORM
(IO = 0)

MAX5035 toc23
1ms/div
A: VON/OFF, 2V/div
B: VOUT, 2V/div
MAX5035DASA STARTUP WAVEFORM
(IO = 1A)

MAX5035 toc24
1ms/div
A: VON/OFF, 2V/div
B: VOUT, 2V/div
PEAK SWITCH CURRENT LIMIT
vs. INPUT VOLTAGE

MAX5035 toc25
INPUT VOLTAGE (V)
PEAK SWITCH CURRENT LIMIT (A)6646362616
MAX5035DASA
VOUT = 5V
5% DROP IN VOUT
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
Pin Description
PINNAMEFUNCTION
BSTBoost Capacitor Connection. Connect a 0.1µF ceramic capacitor from BST to LX.VDInternal Regulator Output. Bypass VD to GND with a 0.1µF ceramic capacitor.SGNDInternal Connection. SGND must be connected to GND.
4FB
Output Sense Feedback Connection. For fixed output voltage (MAX5035A, MAX5035B, MAX5035C),
connect FB to VOUT. For adjustable output voltage (MAX5035D, MAX5035E), use an external resistive
voltage-divider to set VOUT. VFB regulating set point is 1.22V.ON/OFFShutdown Control Input. Pull ON/OFF low to put the device in shutdown mode. Drive ON/OFF high for
normal operation.GNDGround
7VINInput Voltage. Bypass VIN to GND with a low ESR capacitor as close to the device as possible.LXSource Connection of Internal High-Side Switch
ENABLE
BST
VINON/OFF
VREF
REGULATOR
(FOR DRIVER)
REGULATOR
(FOR ANALOG)
OSC
RAMP
HIGH-SIDE
CURRENT
SENSE
IREF-PFM
IREF-LIM
CPFM1.69V
CILIM
VREFEAMP
CONTROL
LOGIC
CPWM
GND
CLK
SGND
MAX5035
TYPE 3
COMPENSATIONTHERMAL
SHUTDOWN
RAMP
Block Diagram

MAX5035
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