MAX17230

2V–36V, Synchronous Dual Buck Controller with Integrated Boost and 20μA Quiescent Current

Synchronous Dual Buck Controller with the Wide V_IN (2V to 42V) and Low I_Q (20µA)

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Overview

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
- 180° Out-of-Phase Operation Reduces Output Ripple and Enables Cascaded Power Supplies
Reduces Number of DC-DC Controllers to Stock
- Fixed Output Voltage with ±1% Accuracy (5V/3.3V) or Externally Resistor Adjustable (1V to 10V)
- 220kHz to 2.2MHz Adjustable Frequency with External Synchronization
- Frequency Synchronization Input
Reduces Power Dissipation
- 92% Peak Efficiency
- 8µA (typ) in Shutdown
- 20µA (typ) Quiescent Current in PFM Mode
Operates Reliably
- 42V Input Voltage Transient Protection
- Cycle-by-Cycle Current Limit, Thermal Shutdown
- Supply Overvoltage and Undervoltage Lockout
- Power-OK Monitor
- Reduced EMI Emission with Spread-Spectrum Control
- 50ns Minimum On-Time Guarantees PWM Operation at Low Duty Cycle at 2.2MHz

The MAX17230/MAX17231 offers dual synchronous stepdown DC-DC controllers with integrated MOSFETs and a step-up/boost controller. They operate over a 3.5V to 36V input voltage range, and down to 2V with the boost controller active. The devices can operate in dropout condition by running at 95% duty cycle. The controllers can generate fixed output voltages of 3.3V/5V, along with the capability to program the output voltage between 1V to 10V.

These devices use 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. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.

The MAX17230/MAX17231 include a boost controller. This boost circuitry turns on during low input voltage conditions. It is designed to power step-down controller channels with input voltages as low as 2V.

These devices are available in a 40-pin TQFN package with exposed pad, and are specified for operation over -40°C to +85°C.

Applications

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

Documentation

Data Sheet 1

MAX17230-MAX17231: 2V–36V, Synchronous Dual Buck Controller with Integrated Boost and 20μA Quiescent Current Data Sheet (Rev.0) 07/12/2017

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

EE-Sim Power® Tools 1

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.

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SIMPLIS Models 1

MAX17230 SIMPLIS Schematic

Evaluation Kits

Evaluation Kit for the MAX17230/MAX17231

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Features and Benefits

Dual, Synchronous Step-Down Controllers Operate at 180° Out-of-Phase to Reduce Switching Noise
Preboost Controller to Maintain Operation with Low Supply Voltage
3.5V to 36V Wide Input Supply Range
Buck Output Voltage: 5V and 3.3V Fixed or Adjustable Between 1V and 10V
Current-Mode Controllers with Forced-PWM and Skip Modes
Resistor-Configurable Frequency Between 1MHz and 2.2MHz
Independent Enable Inputs
85% Peak Efficiency at 12V Input in Skip-Mode
FSYNC Input and Power-Good Output
Proven 4-Layer 2oz Copper PCB Layout
Demonstrates 1937mil x 1702mil Solution Size
Fully Assembled and Tested

Product Details

The MAX17231 evaluation kit (EV kit) is a fully assembled and tested application circuit board for the MAX17231 high-voltage, dual synchronous step-down controller with preboost. The EV kit is set up to provide 5V and 3.3V from an input voltage ranging from 3.5V to 36V. The preboost circuit maintains the 10V supply rail for input voltages below 10V. Each buck rail can deliver up to 5A load current. Various jumpers are provided to help evaluate features of the MAX17231 IC.