MAX17242

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


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.

MAX17242, MAX17243: Typical Application Circuit/Block Diagram MAX17242, MAX17243: Typical Application Circuit/Block Diagram Enlarge+

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
Part Number VIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. Method IOUT1
(A)
Switch Type Synchronous Switching Power Good Signal DC-DC Outputs Oper. Freq.
(kHz)
Package/Pins Budgetary
Price
min max min max max See Notes
MAX17242 NEW! 3.5 36 1 10
3.3
5
Resistor 2 Internal Yes Yes 1
220
2200
THIN QFN/20
$2.19 @1k
MAX17243 NEW! 3
THIN QFN/20
$2.59 @1k
See All Step-Down Switching Regulators (321)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX17243EVKIT: Evaluation Kit for the MAX17243
MAX17242EVKIT: Evaluation Kit for the MAX17242

Quality and Environmental Data

Request Reliability Report for: MAX17242 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

Design & Simulate MAX17242

Related Resources


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