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3.5V–36V, 2A/3A, Synchronous Buck Converter with 15µA Quiescent Current and Reduced EMI

Reliable Operation (42V Input Transient Protection), Long Battery Life (15µA IQ) and EN55022 EMI Performance

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 36
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 2
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 220
2200
Design Tools EE-Sim
Package/Pins TQFN-CU/20
Budgetary
Price (See Notes)
2.44
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 36
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 2
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 220
2200
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=4324', '')
Package/Pins TQFN-CU/20
Budgetary
Price (See Notes)
2.44

Key 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

Applications/Uses

  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • Wall Transformer Regulation

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.

Design Solution: Online Simulator Validates Buck Converter Output Error Budget Analysis ›

Simplified Block Diagram

MAX17242, MAX17243: Typical Application Circuit/Block Diagram MAX17242, MAX17243: Typical Application Circuit/Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .