MAX17242 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – Eliminates External Components and Reduces Total Cost

MAX17242/MAX17243
EVALUATION KIT AVAILABLE
3.5V–36V, 2A/3A, Synchronous Buck Converter
with 15µA Quiescent Current and Reduced EMI
General Description
The MAX17242/MAX17243 high-efficiency, synchronous
step-down DC-DC converters with integrated MOSFETs
operates over a 3.5V to 36V input voltage range, and
can operate in drop-out condition by running at 99% duty
cycle. The converters deliver up to 2A (MAX17242) and
3A (MAX17243) output current and generate fixed output
voltages of 3.3V/5V, along with the ability to program the
output voltage between 1V to 10V.
The devices use a current-mode-control architecture and
can be operated in the pulse-width modulation (PWM)
or pulse-frequency modulation (PFM) 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 operation. The low-resistance, on-chip
MOSFETs ensure high efficiency at full load and simplify
the layout.
The devices are available in a compact 20-pin (5mm x 5mm)
TQFN package with exposed pad. These parts are rated for
-40°C to +85°C operation.
Applications
●● Distributed Supply Regulation
●● Wall Transformer Regulation
●● General-Purpose Point-of-Load
Ordering Information appears at end of data sheet.
Benefits and Features
●● Eliminates External Components and Reduces Total Cost
• No Schottky-Synchronous Operation for High
Efficiency and Reduced Cost
• Simple external RC Compensation for Stable
Operation at Any Output Voltage
• All-Ceramic Capacitor Solution: Ultra-Compact
Layout with as Few as Eight External Components
• PGOOD Output and High-Voltage EN Input
Simplify Power Sequencing
●● Reduces Number of DC-DC Converters to Stock
• Pin Compatibility for 2A/3A Options
• Fixed Output Voltage with ±2% Accuracy (5V/3.3V)
or Externally Resistor Adjustable (1V to 10V) with
±1% FB Accuracy
• 220kHz to 2.2MHz Adjustable Frequency with
External Synchronization
●● Reduces Power Dissipation
• 93% Peak Efficiency
• Shutdown Feature Blocks Current Flow from Input-
to-Output or Vice-Versa
• Less Than 5μA (typ) in Shutdown
• Low 15μA (typ) Quiescent Current in Standby
Mode
●● Operates Reliably
• 42V Input Voltage Transient Protection
• Fixed 8ms Internal Software Start Reduces Input
Inrush Current
• Cycle-by-Cycle Current Limit, Thermal Shutdown
with Automatic Recovery
• Reduced EMI Emission with Spread-Spectrum Control
19-7767; Rev 0; 10/15