MAX17504 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – Step-Down DC-DC Converter with Internal Compensation

MAX17504
EVALUATION KIT AVAILABLE
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 sys­tem 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
Benefits 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
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.
19-6844; Rev 1; 2/14