Analog Devices MAX17007A Product Info

• Dual Quick-PWM with Fast Transient Response
• Automatic Dynamic REFIN1 Detection and PGOOD1/Fault Blanking
• Fixed and Adjustable Output Voltages
  • ±0.7% Output Accuracy Over Line and Load
  • OUT1: 0 to 2V Dynamic Output or Preset 1.05V
  • OUT2: 0.7V to 2V Range or Preset 1.5V
• Resistor-Programmable Switching Frequency
• Integrated BST Switches
• Differential Current-Sense Inputs
  • Low-Cost DCR Sensing or Accurate Current-Sense Resistors
  • Internally Coupled Current-Sense Compensation
• Combinable Mode Supports High-Current Dynamic Output Voltages
• Selectable Forced-PWM, Pulse Skip, or Ultrasonic Mode Operation
• 26V Maximum Input Voltage Rating
• Independent Enable Inputs
• Independent Power-Good Outputs
• Overvoltage Protection (MAX17007A/MAX17007B Only)
• Undervoltage/Thermal Protection
• Voltage Soft-Start and Soft-Shutdown

The MAX17007A/MAX17007B/MAX17008 are dual Quick-PWM™ step-down controllers intended for general power generation in battery-powered systems. The two switched-mode power supplies (SMPSs) can also be combined to operate in a two-phase single-output mode. Constant on-time Quick-PWM operation provides fast response to load transients and handles wide input/output (I/O) voltage ratios with ease, while maintaining a relatively constant switching frequency. The switching frequency can be individually adjusted between 200kHz and 600kHz with external resistors. Differential output current sensing allows output sense-resistor sensing for an accurate current limit, or lossless inductor direct-current resistance (DCR) current sensing for lower power dissipation while maintaining 0.7% output accuracy. Overvoltage (MAX17007A/MAX17007B only), undervoltage protection, and accurate user-selectable current limits (15mV, 30mV, 45mV, and 60mV) ensure robust operations.

The SMPS outputs can operate in skip mode or in ultrasonic mode for improved light-load efficiency. The ultrasonic mode eliminates audible noises by maintaining a minimum switching frequency of 25kHz in pulse-skipping mode.

The output voltage of SMPS1 can be dynamically adjusted by changing the voltage at the REFIN1 pin. The device includes a 0.5% accurate reference output that can be used to set the REFIN1 voltage. An external 5V bias supply is required to power the internal circuitry and its gate drivers.

Independent on/off controls with well-defined logic thresholds and independent open-drain power-good outputs provide flexible system configurations. To prevent current surges at startup, the internal voltage target is slowly ramped up from zero to the final target with a slew rate of 1.3mV/µs for SMPS1 at CSL1 and 0.65mV/µs for SMPS2 at FB2. To prevent the output from ringing off below ground in shutdown, the internal