MAX17230/MAX17231 2V36V, Synchronous Dual Buck Controller with Integrated Boost and 20A Quiescent Current General Description Benefits and Features The MAX17230/MAX17231 offers dual synchronous step- Eliminates External Components and Reduces Total Cost down DC-DC controllers with integrated MOSFETs and a No Schottky-Synchronous Operation for High step-up/boost controller. They operate over a 3.5V to 36V Efficiency and Reduced Cost Simple External RC compensation for Stable input voltage range, and down to 2V with the boost controller active. The devices can operate in dropout condition by Operation at Any Output Voltage All-Ceramic Capacitor Solution: Ultra-Compact running at 95% duty cycle. The controllers can generate fixed output voltages of 3.3V/5V, along with the capability Layout 180 Out-of-Phase Operation Reduces Output to program the output voltage between 1V to 10V. Ripple and Enables Cascaded Power Supplies These devices use current-mode-control architecture and can be operated in the pulse-width modulation Reduces Number of DC-DC Controllers to Stock Fixed Output Voltage with 1% Accuracy (5V/3.3V) (PWM) or pulse-frequency modulation (PFM) control or Externally Resistor Adjustable (1V to 10V) schemes. PWM operation provides constant frequency 220kHz to 2.2MHz Adjustable Frequency with operation at all loads and is useful in applications External Synchronization sensitive to switching frequency. PFM operation disables Frequency Synchronization Input negative inductor current and additionally skips pulses at light loads for high-efficiency. The low-resistance, on-chip Reduces Power Dissipation MOSFETs ensure high efficiency at full load and simplify 92% Peak Efficiency the layout. 8A (typ) in Shutdown 20A (typ) Quiescent Current in PFM Mode The MAX17230/MAX17231 include a boost controller. This boost circuitry turns on during low input voltage Operates Reliably conditions. It is designed to power step-down controller 42V Input Voltage Transient Protection channels with input voltages as low as 2V. Cycle-by-Cycle Current Limit, Thermal Shutdown Supply Overvoltage and Undervoltage Lockout These devices are available in a 40-pin TQFN package Power-OK Monitor with exposed pad, and are specified for operation over Reduced EMI Emission with Spread-Spectrum Control -40C to +85C. 50ns Minimum On-Time Guarantees PWM Operation at Low Duty Cycle at 2.2MHz Applications Distributed Supply Regulation Ordering Information and Selector Guide appear at end of Wall Transformer Regulation data sheet. General-Purpose Point-of-Load 19-8313 Rev 0 2/16MAX17230/MAX17231 2V36V, Synchronous Dual Buck Controller with Integrated Boost and 20A Quiescent Current Typical Application Circuit BIAS OUT1 BIAS BIAS IN EN2 OUT1 CS1 DH2 OUT2 FB1 LX2 PGOOD1 COMP1 BST2 RPGOOD1 MAX17230/ IN DL2 MAX17231 PGND2 DH1 OUT1 LX1 N.C. BST1 BSTON DL1 FSELBST EN1 DL3 IN V IN BAT TERM TERM Maxim Integrated 2 www.maximintegrated.com BIAS AGND PGND1 FOSC IN FSYNC INS N.C. COMP2 TERM CS3P OUT2 CS2 CS3N FB3 FB2 PGND3 EXTVCC EN3 PGOOD2
