MAX15053EWL+T ,High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching RegulatorApplications• Cycle-by-Cycle Overcurrent Protection● Distributed Power Systems● Preregulators for L ..
MAX15054AUT+T ,High-Side MOSFET Driver for HB LED Drivers and DC-DC ApplicationsApplicationsABSOLUTE MAXIMUM RATINGSV to GND .......-0.3V to +6V Thermal Resistance (Note 1)DDLX to ..
MAX15054AUT+T ,High-Side MOSFET Driver for HB LED Drivers and DC-DC ApplicationsELECTRICAL CHARACTERISTICS(V = V = 5V, V = V = 0V, T = T = -40°C to +125°C, unless otherwise noted. ..
MAX15059BETE+T ,76V, 300mW Boost Converter and Current Monitor for APD Bias Applications
MAX15066EWE+T ,High-Efficiency, 4A, Step-Down DC-DC Regulator with Internal Power SwitchesApplicationsCOMPPGOOD● Distributed Power SystemsSS● Preregulators for Linear RegulatorsGND● Home En ..
MAX1507ETA+ ,Linear Li+ Battery Charger with Integrated Pass FET and Thermal Regulation in 3mm x 3mm Thin DFNApplications MAX1507ETA-T -40°C to +85°C 8 Thin DFN-EP* AGWMAX1507ETA+T -40°C to +85°C 8 Thin DFN-E ..
MAX4133ESD ,Single/Dual/Quad / Wide-Bandwidth / Low-Power / Single-Supply / Rail-to-Rail I/O Op AmpsFeaturesThe MAX4130–MAX4134 family of operational amplifiers' 5-Pin SOT23-5 Package (MAX4130)combin ..
MAX4134 ,Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op AmpsFeaturesThe MAX4130–MAX4134 family of operational amplifiers♦ 6-Bump UCSP (MAX4131)combines 10MHz g ..
MAX4134ESD ,Single/Dual/Quad / Wide-Bandwidth / Low-Power / Single-Supply / Rail-to-Rail I/O Op AmpsELECTRICAL CHARACTERISTICS (continued)(V = +2.7V to +6.5V, V = 0V, V = 0V, V = V / 2, R tied to V / ..
MAX4134ESD+ ,Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op AmpsELECTRICAL CHARACTERISTICS (continued)(V = +2.7V to +6.5V, V = 0V, V = 0V, V = V /2, R tied to V /2 ..
MAX4135EWG+ ,1-Input/6-Output Video Distribution AmplifiersApplicationsOUT23 22 SEL3Video Switching and DistributionAGND4 21AGNDHigh-Resolution RGB CRT Monito ..
MAX4137EWG+ ,1-Input/4-Output Video Distribution AmplifiersApplicationsAGND 4 21 AGNDVideo Switching and DistributionMAX41375OUT2 20 IN+High-Resolution RGB CR ..
MAX15053EWL+T
High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator
General DescriptionThe MAX15053 high-efficiency, current-mode, synchro-
nous step-down switching regulator with integrated power
switches delivers up to 2A of output current. The device
operates from 2.7V to 5.5V and provides an output volt-
age from 0.6V up to 94% of the input voltage, making
the device ideal for distributed power systems, portable
devices, and preregulation applications.
The MAX15053 utilizes a current-mode control archi-
tecture with a high gain transconductance error ampli-
fier. The current-mode control architecture facilitates
easy compensation design and ensures cycle-by-cycle
current limit with fast response to line and load transients.
The MAX15053 offers selectable skip-mode functional-
ity to reduce current consumption and achieve a higher
efficiency at light output load. The low RDS(ON) integrated
switches ensure high efficiency at heavy loads while
minimizing critical inductances, making the layout design
a much simpler task with respect to discrete solutions.
Utilizing a simple layout and footprint assures first-pass
success in new designs.
The MAX15053 features a 1MHz, factory-trimmed, fixed-
frequency PWM mode operation. The high switching fre-
quency, along with the PWM current-mode architecture,
allows for a compact, all-ceramic capacitor design.
The MAX15053 offers a capacitor-programmable soft-
start reducing inrush current, startup into PREBIAS
operations, and a PGOOD open-drain output that can be
used as an interrupt and for power sequencing.
The MAX15053 is available in a 9-bump (3 x 3 array),
1.5mm x 1.5mm WLP package and is specified over the
-40NC to +85NC temperature range.
Applications●Distributed Power Systems●Preregulators for Linear Regulators●Portable Devices●Notebook Power●Server Power●IP Phones
Beneits and Features●Simpler, Smaller Design than Discrete Solutions • Integrated 30mΩ (typ) RDS(ON) High-Side and 18mΩ (typ) Low-Side MOSFETs at 5V • Factory-Trimmed, 1MHz Switching Frequency Stable with Low-ESR Ceramic Output Capacitors • Supported by Free EE-Sim® Design and Simulation Tool●High Performance Suits Wide Range of Point-of-
Load Applications ±1% Output-Voltage Accuracy Over Load, Line, and Temperature Continuous 2A Output Current Over Temperature Operates from 2.7V to 5.5V Supply Adjustable Output from 0.6V to Up to 0.94 x VIN●High Efficiency Across Light and Heavy Loads
Reduces Power Consumption and Heat 96% Efficiency with 3.3V Output at 2A • Internal 30mΩ (typ) RDS(ON) High-Side and 18mI (typ) Low-Side MOSFETs at 5V • Skip-Mode Functionality for Light Loads●Control Power Startup and Sequencing for Glitch-Free Processor Operation Enable Input/Power-Good Output Enables
Sequencing Safe-Startup Into Prebiased Output Programmable Soft-Start External Reference Input Can be Used to Drive Soft-Start Directly●Integrated Protection Features for Improved Power-
Supply Reliability • Fully Protected Against Overcurrent and
Overtemperature Input Undervoltage Lockout Cycle-by-Cycle Overcurrent Protection
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit appears at end of data sheet.
Ordering Information
EVALUATION KIT AVAILABLEPARTTEMP RANGEPIN-PACKAGE
MAX15053EWL+-40°C to +85°C9 WLP
EE-Sim is a registered trademark of Maxim Integrated
Products, Inc.
MAX15053High-Eficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator
Electrical Characteristics(VIN = 5V, TA = -40NC to +85NC, unless otherwise noted, typical values are at TA = +25NC.) (Note 4)
Absolute Maximum RatingsNote 1: LX has internal clamp diodes to GND and IN. Applications that forward bias these diodes should not exceed the IC’s package
power dissipation limits.
Note 2: Limit the junction temperature to +105NC for continuous operation at maximum output current.
WLP
Junction-to-Case Thermal Resistance (BJC) ...................26NC/W
Junction-to-Ambient Thermal Resistance (BJA) ..............71NC/W
Note 3: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Package Thermal Characteristics (Note 3)IN, PGOOD to GND ................................................-0.3V to +6V
LX to GND ..................................................-0.3V to (VIN + 0.3V)
LX to GND .......................................-1V to (VIN + 0.3V) for 50ns
EN, COMP, FB, SS/REFIN, SKIP to GND ...-0.3V to (VIN + 0.3V)
LX Current (Note 1) ...................................................-5A to +5A
Output Short-Circuit Duration ....................................Continuous
Continuous Power Dissipation (TA = +70NC)9-Bump WLP Multilayer Board
(derate 14.1mW/NC above TA = +70NC) ....................1127mW
Operating Temperature Range ..........................-40NC to +85NC
Operating Junction Temperature (Note 2) ......................+105NC
Storage Temperature Range ............................-65NC to +150NC
Soldering Temperature (reflow) ......................................+260NC
PARAMETERSYMBOLCONDITIONS MINTYPMAXUNITS
IN Voltage RangeVIN2.75.5V
IN Shutdown Supply CurrentVEN = 0V0.22FA
IN Supply CurrentIINVEN = 5V, VFB = 0.65V, no switching1.562.3mA
VIN Undervoltage Lockout
ThresholdLX starts switching, VIN rising2.62.7V
VIN Undervoltage Lockout
HysteresisLX stops switching, VIN falling200mV
ERROR AMPLIFIER
TransconductancegMV1.5mS
Voltage GainAVEA90dB
FB Set-Point AccuracyVFBOver line, load, and temperature594600606mV
FB Input Bias CurrentIFBVFB = 0.6V-500+500nA
COMP to Current-Sense
TransconductancegMC18A/V
COMP Clamp LowVFB = 0.65V, VSS = 0.6V0.94V
POWER SWITCHES
LX On-Resistance, High-Side
pMOS30mI
LX On-Resistance, Low-Side
nMOS18mI
High-Side Switch Current-Limit
ThresholdIHSCL4A
Low-Side Switch Sink Current-
Limit Threshold4A
MAX15053High-Eficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator
Electrical Characteristics (continued)(VIN = 5V, TA = -40NC to +85NC, unless otherwise noted, typical values are at TA = +25NC.) (Note 4)
Note 4: Specifications are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
PARAMETERSYMBOLCONDITIONS MINTYPMAXUNITS
Low-Side Switch Source Current-
Limit Threshold4A
LX Leakage CurrentVEN = 0V10FA
RMS LX Output Current2A
OSCILLATOR
Switching FrequencyfSW85010001150kHz
Maximum Duty CycleDMAX9495.8%
Minimum Controllable On-Time70ns
Slope Compensation Ramp
Valley1.15V
Slope Compensation Ramp
AmplitudeVSLOPEExtrapolated to 100% duty cycle320mV
ENABLE
EN Input High Threshold VoltageVEN rising 1.45V
EN Input Low Threshold VoltageVEN falling0.4V
EN Input Leakage CurrentVEN = 5V0.025FA
SKIP Input Leakage CurrentVSKIP = VEN = 5V25FA
SOFT-START, PREBIAS, REFIN
Soft-Start CurrentISSVSS/REFIN = 0.45V, sourcing10FA
SS/REFIN Discharge ResistanceRSSISS/REFIN = 10mA, sinking8.3I
SS/REFIN Prebias Mode Stop
VoltageVSS/REFIN rising0.58V
External Reference Input Range0VIN -
1.8V
HICCUP
Number of Consecutive Current-
Limit Events to Hiccup8Events
Timeout1024Clock
Cycles
POWER-GOOD OUTPUT
PGOOD ThresholdVFB rising0.5350.5550.575V
PGOOD Threshold HysteresisVFB falling28mV
PGOOD VOLIPGOOD = 5mA, VFB = 0.5V2060mV
PGOOD LeakageVPGOOD = 5V, VFB = 0.65V0.013FA
THERMAL SHUTDOWN
Thermal Shutdown Threshold150NC
Thermal Shutdown HysteresisTemperature falling20NC
MAX15053High-Eficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX15053 toc07
OUTPUT VOLTAGE (V)
VOUT = 5V
VOUT = 3.3V
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX15053 toc06
OUTPUT VOLTAGE (V)
IOUT = 0.5A
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX15053 toc05
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
EFFICIENCY vs. OUTPUT CURRENT
(SKIP MODE)
MAX15053 toc04
OUTPUT CURRENT (mA)
EFFICIENCY (%)
VIN = 3.3V
VOUT = 2.5VVOUT = 1.5V
VOUT = 1.8VVOUT = 1.2V
EFFICIENCY vs. OUTPUT CURRENT
(SKIP MODE)
MAX15053 toc03
OUTPUT CURRENT (mA)
EFFICIENCY (%)
VIN = 5V
VOUT = 3.3V
VOUT = 2.5VVOUT = 1.5V
VOUT = 1.8VVOUT = 1.2V
EFFICIENCY vs. OUTPUT CURRENT
(PWM MODE)
MAX15053 toc02
OUTPUT CURRENT (mA)
EFFICIENCY (%)
VOUT = 2.5VVOUT = 1.8VVOUT = 1.2V
VIN = 3.3V
VOUT = 1.5V
EFFICIENCY vs. OUTPUT CURRENT
(PWM MODE)
MAX15053 toc01
OUTPUT CURRENT (mA)
EFFICIENCY (%)
VOUT = 3.3VVOUT = 1.8VVOUT = 1.2V
VIN = 5V
VOUT = 2.5VVOUT = 1.5V
MAX15053High-Eficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator
Typical Operating Characteristics(VIN = 5V, VOUT = 1.8V, ILOAD = 2A, Circuit of Figure 5, TA = +25NC, unless otherwise noted.)
SHUTDOWN WAVEFORM
MAX15053 toc12
VOUT
1V/div
VENABLE
5V/div
VPGOOD
5V/div
ILX
1A/div
INPUT AND OUTPUT RIPPLE VOLTAGE
WAVEFORM (IOUT = 2A)
MAX15053 toc11
INPUT
20mV/div
AC-COUPLED
OUTPUT
100mV/div
AC-COUPLED
SWITCHING WAVEFORM IN SKIP MODE
(IOUT = 10mA)
MAX15053 toc10
VOUT
50mV/div
AC-COUPLED
VLX
5V/div
ILX
1A/div
10µs/div
SWITCHING WAVEFORMS
MAX15053 toc09b
VOUT
50mV/div
AC-COUPLED
VLX
5V/div
ILX
1A/div
400ns/div
VIN = 3.3V
SWITCHING WAVEFORMS
(IOUT = 2A)
MAX15053 toc9a
VOUT
50mV/div
AC-COUPLED
VLX
5V/div
ILX
1A/div
400ns/div
VIN = 5V
LOAD-TRANSIENT RESPONSE
MAX15053 toc08
VOUT
100mV/div
AC-COUPLED
IOUT
1A/div
40µs/div
PWM MODE
MAX15053High-Eficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator
Typical Operating Characteristics (continued)(VIN = 5V, VOUT = 1.8V, ILOAD = 2A, Circuit of Figure 5, TA = +25NC, unless otherwise noted.)
Typical Operating Characteristics (continued)(VIN = 5V, VOUT = 1.8V, ILOAD = 2A, Circuit of Figure 5, TA = +25NC, unless otherwise noted.)
FB VOLTAGE vs. TEMPERATURE
MAX15053 toc17
FEEDBACK VOLTAGE (V)6040200-20
NO LOAD
RMS INPUT CURRENT
vs. INPUT VOLTAGE
MAX15053 toc16
RMS INPUT CURRENT (mA)
SHORT CIRCUIT ON OUTPUT
SHORT-CIRCUIT HICCUP MODE
MAX15053 toc15
IIN
500mA/div
VOUT
1V/div
IOUT
5A/div
200µs/div
QUIESCENT CURRENT
vs. INPUT VOLTAGE
MAX15053 toc14
INPUT VOLTAGE (V)
QUIESCENT CURRENT (nA)
VEN = 0V
SOFT-START WAVEFORMS (SKIP MODE)
(IOUT = 2A)
MAX15053 toc13b
VOUT
1V/div
VENABLE
5V/div
VPGOOD
5V/div
ILX
1A/div
200µs/div
SOFT-START WAVEFORMS (PWM)
(IOUT = 2A)
MAX15053 toc13a
VOUT
1V/div
VENABLE
5V/div
VPGOOD
5V/div
ILX
1A/div
200µs/div
MAX15053High-Eficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator
Typical Operating Characteristics (continued)(VIN = 5V, VOUT = 1.8V, ILOAD = 2A, Circuit of Figure 5, TA = +25NC, unless otherwise noted.)
STARTING INTO A PREBIASED OUTPUT
(IOUT = 2A)
MAX15053 toc19
VENABLE
5V/div
VOUT
1V/div
VPGOOD
5V/div
ILX
1A/div
200µs/div
PWM MODE
STARTING INTO A PREBIASED OUTPUT
HIGHER THAN SET OUTPUT
MAX15053 toc21
VOUT
500mV/div
VSS/REFIN
500mV/div
1A/div
1.8V
10I LOAD AT OUT
STARTING INTO A PREBIASED OUTPUT
MAX15053 toc20b
VENABLE
5V/div
VOUT
1V/div
VPGOOD
5V/div
ILX
1A/div
200µs/div
STARTING INTO A PREBIASED OUTPUT
(NO LOAD)
MAX15053 toc20a
VENABLE
5V/div
VOUT
1V/div
VPGOOD
5V/div
ILX
1A/div
200µs/div
PWM MODE
SOFT-START WAVEFORMS
(EXTERNAL REFIN) (SKIP MODE)
MAX15053 toc18b
VSS/REFIN
500mV/div
VOUT
1V/div
VPGOOD
5V/div
ILX
1A/div
200µs/div
NO LOAD
SOFT-START WAVEFORMS
(EXTERNAL REFIN) (PWM MODE)
MAX15053 toc18a
VSS/REFIN
500mV/div
VOUT
1V/div
VPGOOD
5V/div
ILX
1A/div
200µs/div
NO LOAD
MAX15053High-Eficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator
Typical Operating Characteristics (continued)(VIN = 5V, VOUT = 1.8V, ILOAD = 2A, Circuit of Figure 5, TA = +25NC, unless otherwise noted.)
INPUT CURRENT (mA)
INPUT CURRENT IN SKIP MODE
vs. OUTPUT VOLTAGE
MAX15053 toc23
OUTPUT VOLTAGE (V)
NO LOAD
VCC = 3.3V
VCC = 5.0V
CASE TEMPERATURE
vs. AMBIENT TEMPERATURE
MAX15053 toc22
AMBIENT TEMPERATURE (°C)
CASE TEMPERATURE (°C)6040200-20
MAX15053High-Eficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator
Pin Description
Pin ConigurationBUMPNAMEFUNCTIONGNDAnalog Ground/Low-Side Switch Source Terminal. Connect to the PCB copper plane at one point near
the input bypass capacitor return terminal.LXInductor Connection. Connect LX to the switched side of the inductor. LX is high impedance when the
IC is in shutdown mode.INInput Power Supply. Input supply range is from 2.7V to 5.5V. Bypass with a minimum 10FF ceramic
capacitor to GND. See Figures 5 and 6.COMPVoltage Error-Amplifier Output. Connect the necessary compensation network from COMP to GND. See
the Closing the Loop: Designing the Compensation Circuitry section.SKIPSkip-Mode Input. Connect to EN to select skip mode or leave unconnected for normal operation.ENEnable Input. EN is a digital input that turns the regulator on and off. Drive EN high to turn on the regulator.
Connect to IN for always-on operation.FBFeedback Input. Connect FB to the center tap of an external resistor-divider from the output to GND to
set the output voltage from 0.6V up to 94% of VIN. SS/REFIN
Soft-Start/External Voltage Reference Input. Connect a capacitor from SS/REFIN to GND to set the startup
time. See the Setting the Soft-Start Time section for details on setting the soft-start time. Apply a voltage
reference from 0V to VIN - 1.5V to drive soft-start externally.PGOODOpen-Drain Power-Good Output. PGOOD goes high when FB is above 555mV and pulls low if FB is
below 527mV.
WLP
TOP VIEW
(BUMPS ON BOTTOM)
SS/REFINFB PGOOD
SKIPCOMPENGNDIN
MAX15053C2C3B3A2
MAX15053High-Eficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator
Block DiagramBIAS
GENERATOR
EN LOGIC, IN UVLO
THERMAL SHDN
SKIP-MODE
LOGIC
CONTROL
LOGIC
SKPM
0.58V
GND
PGOOD
SS/REFIN
RAMP
COMP
SKIP
SHDN
VOLTAGE
REFERENCE
OSCILLATOR
RAMP GEN
SKPM
SKPM
SINK
SOURCE
LOW-SIDE SOURCE-SINK
CURRENT LIMIT AND ZERO-
CROSSING COMPARATOR
0.6V
HIGH-SIDE
CURRENT LIMIT
STRONG PREBIASED
FORCED START
SS/REFIN BUFFER
ERROR AMPLIFIER
10µA
PWM
COMPARATOR
POWER-GOOD
COMPARATOR
CURRENT-SENSE
AMPLIFIER
0.555V RISING,
0.527V FALLING
MAX15053
MAX15053High-Eficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator
Detailed DescriptionThe MAX15053 high-efficiency, current-mode switch-
ing regulator can deliver up to 2A of output current. The
MAX15053 provides output voltages from 0.6V to 0.94 x
VIN from 2.7V to 5.5V input supplies, making the device
ideal for on-board point-of-load applications.
The MAX15053 delivers current-mode control architec-
ture using a high gain transconductance error amplifier.
The current-mode control architecture facilitates easy
compensation design and ensures cycle-by-cycle current
limit with fast response to line and load transients.
The MAX15053 features a 1MHz fixed switching frequen-
cy, allowing for all-ceramic capacitor designs and fast
transient responses. The high operating frequency mini-
mizes the size of external components. The MAX15053 is
available in a 1.5mm x 1.5mm (3 x 3 array) x 0.5mm pitch
WLP package.
The MAX15053 offers a selectable skip-mode functional-
ity to reduce current consumption and achieve a higher
efficiency at light output loads. The low RDS(ON) inte-
grated switches (30mI high-side and 18mI low-side,
typ) ensure high efficiency at heavy loads while minimiz-
ing critical inductances, making the layout design a much
simpler task with respect to discrete solutions. Utilizing a
simple layout and footprint assures first-pass success in
new designs.
The MAX15053 features 1MHz Q15%, factory-trimmed,
fixed-frequency PWM mode operation. The MAX15053 also
offers capacitor-programmable, soft-start reducing inrush
current, startup into PREBIAS operation, and a PGOOD
open-drain output for sequencing with other devices.
Controller Function–PWM LogicThe controller logic block is the central processor that determines the duty cycle of the high-side MOSFET
under different line, load, and temperature conditions.
Under normal operation, where the current-limit and
temperature protection are not triggered, the controller
logic block takes the output from the PWM comparator
and generates the driver signals for both high-side and low-side MOSFETs. The control logic block controls the
break-before-make logic and all the necessary timing.
The high-side MOSFET turns on at the beginning of the
oscillator cycle and turns off when the COMP voltage
crosses the internal current-mode ramp waveform, which
is the sum of the slope compensation ramp and the
current-mode ramp derived from inductor current (current-sense block). The high-side MOSFET also turns off if the
reached. The low-side MOSFET turns on for the remain-
der of the oscillation cycle.
Starting into a Prebiased OutputThe MAX15053 can soft-start into a prebiased output
without discharging the output capacitor. In safe pre-biased startup, both low-side and high-side MOSFETs
remain off to avoid discharging the prebiased output. PWM operation starts when the voltage on SS/REFIN crosses the voltage on FB.
The MAX15053 can start into a prebiased voltage higher
than the nominal set point without abruptly discharg-ing the output. Forced PWM operation starts when the SS/REFIN voltage reaches 0.58V (typ), forcing the con-
verter to start. In case of prebiased output, below or above
the output nominal set point, if low-side sink current-limit
threshold (set to the reduced value of -0.4A (typ) for the
first 32 clock cycles and then set to -4A typ) is reached,
the low-side switch turns off before the end of the clock
period, and the high-side switch turns on until one of the
following conditions is satisfied:High-side source current hits the reduced high-side
current limit (0.4A, typ); in this case, the high-side
switch is turned off for the remaining time of the clock
period.The clock period ends. Reduced high-side current
limit is activated to recirculate the current into the
high-side power switch rather than into the internal
high-side body diode, which could be damaged.
Low-side sink current limit is provided to protect the
low-side switch from excessive reverse current during
prebiased operation.
In skip mode operation, the prebias output needs to be
lower than the set point.
Enable InputThe MAX15053 features independent device enable con-
trol and power-good signal that allow for flexible power
sequencing. Drive the enable input (EN) high to enable
the regulator, or connect EN to IN for always-on opera-
tion. Power-good (PGOOD) is an open-drain output that
asserts when VFB is above 555mV (typ), and deasserts
low if VFB is below 527mV (typ).
Programmable Soft-Start (SS/REFIN)The MAX15053 utilizes a soft-start feature to slowly
ramp up the regulated output voltage to reduce input
inrush current during startup. Connect a capacitor from SS/REFIN to GND to set the startup time (see the Setting
MAX15053High-Eficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator
