Datasheet

MAX17504 4.5V–60V, 3.5A, High-Efficiency, Synchronous
Step-Down DC-DC Converter
with Internal Compensation
General Description
The MAX17504 high-efficiency, high-voltage,
synchronously rectified step-down converter with dual
integrated MOSFETs operates over a 4.5V to 60V
input. It delivers up to 3.5A and 0.9V to 90% V
IN
output
voltage. Built-in compensation across the output voltage
range eliminates the need for external components. The
feedback (FB) regulation accuracy over -40°C to +125°C
is ±1.1%. The device is available in a compact (5mm x
5mm) TQFN lead (Pb)-free package with an exposed pad.
Simulation models are available.
The device features a peak-current-mode control
architecture with a MODE feature that can be used to
operate the device in pulse-width modulation (PWM),
pulse-frequency modulation (PFM), or discontinuous
mode (DCM) control schemes. PWM operation provides
constant frequency operation at all loads, and is useful
in applications sensitive to switching frequency. PFM
operation disables negative inductor current and
additionally skips pulses at light loads for high efficiency.
DCM features constant frequency operation down to
lighter loads than PFM mode, by not skipping pulses,
but only disabling negative inductor current at light loads.
DCM operation offers efficiency performance that lies
between PWM and PFM modes. The low-resistance,
on-chip MOSFETs ensure high efficiency at full load and
simplify the layout.
A programmable soft-start feature allows users to reduce
input inrush current. The device also incorporates an
output enable/undervoltage lockout pin (EN/UVLO) that
allows the user to turn on the part at the desired input-
voltage level. An open-drain RESET pin provides a
delayed power-good signal to the sys tem upon achieving
successful regulation of the output voltage.
Applications
● IndustrialPowerSupplies
● DistributedSupplyRegulation
● BaseStationPowerSupplies
● WallTransformerRegulation
● High-VoltageSingle-BoardSystems
● General-PurposePoint-of-Load
Benets and Features
● EliminatesExternalComponentsandReducesTotalCost
• NoSchottky-SynchronousOperationforHigh
EfficiencyandReducedCost
• Internal compensation for Stable Operation at Any
Output Voltage
• All Ceramic Capacitor Solution: Ultra-Compact
Layout with as Few as Eight External Components
●
ReduceNumberofDC-DCRegulatorstoStock
• Wide4.5Vto60VInputVoltageRange
• 0.9V to 90% V
IN
Output Voltage
• Delivers Up to 3.5A Over Temperature
• 200kHzto2.2MHzAdjustableFrequencywith
ExternalSynchronization
• Available in a 20-Pin, 5mm x 5mm TQFN Package
●
ReducePowerDissipation
• Peak Efficiency > 90%
• PFMandDCMModesforHighLight-LoadEfficiency
• Shutdown Current = 2.8FA (typ)
●
OperateReliably
• Hiccup-ModeCurrentLimitandAutoretryStartup
• Built-In Output Voltage Monitoring—(Open-Drain
RESET Pin)
• ResistorProgrammableEN/UVLOThreshold
• AdjustableSoft-StartandPre-BiasedPower-Up
• -40NC to +125NC Operation
19-6844; Rev 1; 2/14
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX17504.related.
EVALUATION KIT AVAILABLE