MAX618EEE+-MAX618EEE+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX618EEE+ ,28V, PWM, Step-Up DC-DC ConverterElectrical Characteristics(V = +6V, PGND = GND, C = 4.7μF, T = 0°C to +85°C, unless otherwise noted ..
MAX618EEE+T ,28V, PWM, Step-Up DC-DC ConverterFeaturesThe MAX618 CMOS, PWM, step-up DC-DC converter ● Adjustable Output Voltage Up to +28Vgenerat ..
MAX619 ,Regulated 5V Charge Pump DC-DC ConverterApplications_______________Ordering InformationTwo Battery Cells to 5V Conversion PART TEMP. RANGE ..
MAX6190AESA ,Precision / Micropower / Low-Dropout Voltage ReferencesELECTRICAL CHARACTERISTICS—MAX6190(V = +5V, I = 0, T = T to T , unless otherwise noted. Typical val ..
MAX6190AESA ,Precision / Micropower / Low-Dropout Voltage Referencesapplications that require fast settling,Analog-to-Digital and Digital-to-Analog Convertersand are s ..
MAX6190AESA+ ,Precision, Micropower, Low-Dropout Voltage Referencesapplications that require fast settling,Analog-to-Digital and Digital-to-Analog Convertersand are s ..
MAZS1500L ,Silicon planar typeZener DiodesMAZS000 SeriesSilicon planar typeUnit : mmFor constant voltage, constant-current, wavef ..
MAZS160 ,Small-signal deviceelectrical characteristicsZK Zwithin part numbersZener operating resistance R I Specified value ΩZ ..
MAZS1600-M ,Silicon planar typeFeatures•SS-mini type 2-pin package•Low noise type•V rank classified (V = 2.4 V to 39 V)Z Z
MAZS220 ,Small-signal deviceElectrical Characteristics T = 25°C±3°C aParameter Symbol Conditions Min Typ Max UnitForward volta ..
MAZS2400L ,Silicon planar typeelectrical characteristicsZ Zwithin part numbersReverse current I V ··············· Specified value ..
MAZS3000-H ,Silicon planar typeelectrical characteristicsZ Zwithin part numbersReverse current I V ··············· Specified value ..

MAX618EEE+-MAX618EEE+T
28V, PWM, Step-Up DC-DC Converter
General Description
The MAX618 CMOS, PWM, step-up DC-DC converter
generates output voltages up to 28V and accepts inputs from +3V to +28V. An internal 2A, 0.3Ω switch eliminates the need for external power MOSFETs while supplying
output currents up to 500mA or more. A PWM control scheme combined with Idle Mode™ operation at light loads minimizes noise and ripple while maximizing effi-ciency over a wide load range. No-load operating current is 500μA, which allows efficiency up to 93%.fast 250kHz switching frequency allows the use of
small surface-mount inductors and capacitors. A shut-down mode extends battery life when the device is not in use. Adaptive slope compensation allows the MAX618 to accommodate a wide range of input and output voltages with a simple, single compensation capacitor.
The MAX618 is available in a thermally enhanced 16-pin QSOP package that is the same size as an industry-
standard 8-pin SO but dissipates up to 1W. An evaluation kit (MAX618EVKIT) is available to help speed designs.
Applications●Industrial +24V and +28V Systems●LCD Displays●Palmtop Computers
Features●Adjustable Output Voltage Up to +28V●Up to 93% Efficiency●Wide Input Voltage Range (+3V to +28V)●Up to 500mA Output Current at +12V●500μA Quiescent Supply Current●3μA Shutdown Current●250kHz Switching Frequency●Small 1W, 16-Pin QSOP Package
Idle Mode is a trademark of Maxim Integrated Products, Inc.
+Denotes a lead(Pb)-free/RoHS-compliant package.
PARTTEMP. RANGEPIN-PACKAGE
MAX618EEE+-40°C to +85°C16 QSOP
PGNDVL
VOUT
UP TO
28V
COMP
SHDN
GND
VIN
3V TO
28VMAX618
GNDGND
PGND
PGND
PGND
GND
GND
TOP VIEW
MAX618
QSOP
COMP
SHDN
GND
MAX61828V Internal Switch, Step-Up DC-DC Converter
Typical Application Circuit
Pin Coniguration
Ordering Information
EVALUATION KIT AVAILABLE
IN to GND ...............................................................-0.3V to +30VLX to GND ..............................................................-0.3V to +30VVL to GND ................................................................-0.3V to +6V
SHDN, COMP, FB to GND ............................-0.3V to (VL + 0.3V)PGND to GND.....................................................................±0.3V
Continuous Power Dissipation (TA = +70°C) (Note 1) 16-Pin QSOP (derate 15mW/°C above +70°C)...................1WOperating Temperature Range ...........................-40°C to +85°CJunction Temperature......................................................+150°CStorage Temperature Range .............................-65°C to +150°CSoldering Temperature (reflow) .......................................+260°C
(VIN = +6V, PGND = GND, CVL = 4.7μF, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Input VoltageVIN328V
Supply Current, No LoadIINVIN = 3V to 28V, VFB = 1.6V, SHDN = VL500700µA
Supply Current, Full Load, VL Connected to INIINV IN = 3V to 5.5V, VFB = 1.4V,
SHDN = VL = IN56.5mA
Supply Current, Full LoadIINVIN = 3.4V to 28V, VFB = 1.4V,
SHDN = VL, VVL < VIN2.53.5mA
Shutdown Supply CurrentIINVIN = 28V, VFB = 1.6V, SHDN = GND38µA
VL Output VoltageVVLVIN = 3.5V or 28V, no load2.93.053.2V
VL Load RegulationDVVLILOAD = 0 to 2mA, VFB = 1.6V2540mV
VL Undervoltage LockoutRising edge, 1% hysteresis2.582.72.8V
FB Set VoltageVFB1.471.51.53V
FB Input Bias CurrentIFBVFB = 1.6V150nA
Line RegulationDVOUTVIN = 3V to 6V,VOUT = 12V0.010.08%/V
Load RegulationDVOUTVOUT = 12V, ILOAD = 10mA to 500mA0.2%
LX VoltageVLX28V
LX Switch Current LimitILXONPWM mode1.72.22.7A
Idle Mode Current Limit
Threshold0.250.350.45A
LX On-ResistanceRLXON0.30.6Ω
LX Leakage CurrentILXOFFVLX = 28V0.0210µA
COMP Maximum Output CurrentICOMPFB = GND100200µA
COMP Voltage to Switch Current
TransconductanceDFB = 0.1V0.81mmho
SHDN Input Logic LowVIL0.8V
SHDN Input Logic HighVIH2.0V
Shutdown Input CurrentSHDN = GND or VL1µA
Switching Frequencyf200250300kHz
MAX61828V Internal Switch, Step-Up DC-DC Converter
Note 1: With part mounted on 0.9 in.2 of copper.
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.
Electrical Characteristics
(VIN = +6V, PGND = GND, CVL = 4.7μF, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
(Circuit of Figure 1, TA = +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Input VoltageVIN328V
Supply Current, No LoadIINVIN = 3V to 28V, VFB = 1.6V, SHDN = VL800µA
Supply Current, Full Load, VL Connected to INIINVIN = 3V to 5.5, VFB = 1.4V,
SHDN = VL = IN7.5mA
Supply Current, Full LoadIINVIN = 3.4V to 28V, VFB = 1.4V,
SHDN = VL, VVL < VIN4mA
Supply Current ShutdownIINVIN = 28V, VFB = 1.6V, SHDN = GND10µA
VL Output VoltageVVLVIN = 3.5V or 28V, no load2.853.3V
VL Undervoltage LockoutVVLRising edge, 1% hysteresis2.552.85V
FB Set VoltageVFB1.4551.545V
LX Voltage RangeVLXON28V
LX Switch Current LimitILXONPWM mode1.43A
LX On-ResistanceRLXON0.6Ω
Switching Frequencyf188312kHz
EFFICIENCY vs. OUTPUT CURRENT
(VOUT = 12V)
MAX618 toc01
OUTPUT CURRENT (mA)
EFFICIENCY (%)40
VIN = 8V
VIN = 5VVIN = 3V
EFFICIENCY vs. OUTPUT CURRENT
(VOUT = 28V)
MAX618 toc02
OUTPUT CURRENT (mA)
EFFICIENCY (%)40
VIN = 12V
VIN = 5V
VIN = 3V
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX618 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
VOUT = 12V
MAX61828V Internal Switch, Step-Up DC-DC Converter
Electrical Characteristics (continued)
Typical Operating Characteristics
(Circuit of Figure 1, TA = +25°C.)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX618 toc04
INPUT VOLTAGE (V)
SUPPLY CIRRENT (µA)
SUPPLY CURRENT vs. TEMPERATURE
MAX618 toc05
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
VIN = 8V
VIN = 5V
VIN = 3V
INCLUDES CAPACITOR LEAKAGE CURRENT
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX618 toc06
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (µA)
VOUT
(100mV/div)
VLX
(10V/div)
(1A/div)
MEDIUM-LOAD SWITCHING
WAVEFORMS
MAX618 toc07
VIN = 5V, VOUT = 12V, IOUT = 200mA
2µs/div
VOUT
(100mV/
div)
VLX
(10V/div)
(1A/div)
HEAVY-LOAD SWITCHING
WAVEFORMS
MAX618 toc08
VIN = 5V, VOUT = 12V, IOUT = 500mA
2µs/div
VOUT
(50mV/div)
VIN
(5V/div)
LINE-TRANSIENT RESPONSE
MAX618 toc09
IOUT = 200mA, VOUT = 12V
2ms/div
VOUT
(200mV/div)
IOUT
(100mA/div)
LOAD-TRANSIENT RESPONSE
MAX618 toc10
5ms/div
12V
SHDN
(2V/div)
VOUT
(2V/div)
SHUTDOWN RESPONSE
MAX618 toc11
500µs/div
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX618 toc12
MAXIMUM OUTPUT CURRENT (A)
VOUT = 12V
MAX61828V Internal Switch, Step-Up DC-DC Converter
Typical Operating Characteristics (continued)
Figure 1. Single-Supply Operation
PINNAMEFUNCTION
1, 8, 9,
12, 16GNDGround
2, 3, 4LXDrain of Internal n-channel Switch. Connect the inductor between IN and LX.SHDNShutdown Input. A logic low puts the MAX618 in shutdown mode and reduces supply current to 3µA.
SHDN must not exceed VL. In shutdown, the output falls to VIN less one diode drop.COMPCompensation Input. Bypass to GND with the value of capacitance shown in Table 2.FBFeedback Input. Connect a resistor-divider network to set VOUT. FB threshold is 1.5V.INLDO Regulator Supply Input. IN accepts inputs up to +28V. Bypass to GND with a 1µF ceramic capacitor
as close to pins 10 and 12 as possible.VLInternal 3.1V LDO Regulator Output. Bypass to GND with a 4.7µF capacitor.
13, 14, 15PGNDPower Ground. Source of internal N-channel switch.
COMP 2
+5V INPUT
169kΩ
100kΩ
LOW BATTERY INPUT
1.31V
OSC
RON
AT 3Ω
40kHzCOMP 1
1.31V
BANDGAP
REFERENCE
AND
BIAS GENERATORLBRCXLXGND
1N4148
+VS56
VFB7
LBD8LOW-BATTERY OUTPUT
(LOW IF INPUT < 3V)
499kΩ
47.5kΩ
SHUTDOWN
OPERATE
+15V OUTPUT
20mAC1
470mF
25V
MAX618
COMP 2
MAX61828V Internal Switch, Step-Up DC-DC Converter
Pin Description
Detailed Description
The MAX618 pulse-width modulation (PWM) DC-DC converter with an internal 28V switch operates in a wide
range of DC-DC conversion applications including boost, SEPIC, and flyback configurations. The MAX618 uses fixed-frequency PWM operation and Maxim’s proprietary Idle Mode control to optimize efficiency over a wide range of loads. It also features a shutdown mode to minimize quiescent current when not in operation.
PWM Control Scheme and
Idle Mode Operation
The MAX618 combines continuous-conduction PWM operation at medium to high loads and Idle Mode opera-tion at light loads to provide high efficiency over a wide
range of load conditions. The MAX618 control scheme actively monitors the output current and automatically switches between PWM and Idle Mode to optimize efficiency and load regulation. Figure 2 shows a functional diagram of the MAX618’s control scheme.
The MAX618 normally operates in low-noise, continuous- conduction PWM mode, switching at 250kHz. In PWM mode, the internal MOSFET switch turns on with each clock pulse. It remains on until either the error comparator trips or the inductor current reaches the 2A switch-current
limit. The error comparator compares the feedback-error
signal, current-sense signal, and slope-compensation signal in one circuit block. When the switch turns off, energy transfers from the inductor to the output capacitor. Output current is limited by the 2A MOSFET current limit
Figure 2. Functional Diagram
SHDN
MAX618
IDLE MODE
CURRENT LIMIT
PWM
CURRENT LIMIT
ERROR
COMPARATOR
250kHz
OSCILLATOR
SLOPE
COMPENSATION
LINEAR
REGULATOR
CURRENT-
SENSE
CIRCUIT
PGNDINOUTR
14R
COMP
VL
NMOS
REFERENCE
INTEGRATOR
GND
SHUTDOWN
PWM
LOGIC
THERMAL
SHUTDOWN
MAX61828V Internal Switch, Step-Up DC-DC Converter
and the MAX618’s package power-dissipation limit. See
the Maximum Output Current section for details.
In Idle Mode, the MAX618 improves light-load efficiency by reducing inductor current and skipping cycles to reduce the losses in the internal switch, diode, and inductor. In this mode, a switching cycle initiates only when the error comparator senses that the output voltage
is about to drop out of regulation. When this occurs, the NMOS switch turns on and remains on until the inductor current exceeds the nominal 350mA Idle Mode current
limit.
Refer to Table 1 for an estimate of load currents at which the MAX618 transitions between PWM and Idle Mode.
Compensation Scheme
Although the higher loop gain of voltage-controlled
architectures tends to provide tighter load regulation, current-controlled architectures are generally easier to compensate over wide input and output voltage ranges.
The MAX618 uses both control schemes in parallel: the dominant, low-frequency components of the error signal are tightly regulated with a voltage-control loop, while a current-control loop improves stability at higher
frequencies. Compensation is achieved through the
selection of the output capacitor (COUT), the integrator
capacitor (CCOMP), and the pole capacitor (CP) from FB to GND. CP cancels the zero formed by COUT and its ESR. Refer to the Capacitor Selection section for
guidance on selecting these capacitors.
VL Low-Dropout Regulator
The MAX618 contains a 3.1V low-dropout linear regulator to power internal circuitry. The regulator’s input is IN and its output is VL. The IN to VL dropout voltage is 100mV, so that when IN is less than 3.2V, VL is typically 100mV below IN. The MAX618 still operates when the LDO is in
dropout, as long as VL remains above the 2.7V undervolt-age lockout. Bypass VL with a 4.7μF ceramic capacitor placed as close to the VL and GND pins as possible.
VL can be overdriven by an external supply between 2.7V and 5.5V. In systems with +3.3V or +5V logic power supplies available, improve efficiency by powering VL and
VIN directly from the logic supply as shown in Figure 3.
MAX61828V Internal Switch, Step-Up DC-DC Converter
ransition
Load
Current (I
OUT
in
Amps)
vs.
Input
and
Output
oltage
OUT
MAX61828V Internal Switch, Step-Up DC-DC Converter

Partno	Mfg	Dc	Qty	Available	Descript
MAX618EEE+ \|MAX618EEE	MAX	N/a	759	avai	28V, PWM, Step-Up DC-DC Converter
MAX618EEE+T \|MAX618EEET	MAXIM	N/a	13	avai	28V, PWM, Step-Up DC-DC Converter