Simplified Block Diagram
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- Quick-PWM Architecture
- ±1% VOUT Accuracy Over Line and Load
- 5-Bit On-Board DAC with Input Muxes
- Precision-Adjustable VOUT Slew Control
- 0.6V to 1.75V Output Adjust Range
- Precision Offset Control
- Supports Voltage-Positioned Applications
- 2V to 28V Battery Input Range
- Requires a Separate 5V Bias Supply
- 200kHz/300kHz/550kHz/1000kHz Switching Frequency
- Overvoltage/Undervoltage Protection
- Drives Large Synchronous-Rectifier FETs
- 700µA (typ) ICC Supply Current
- 2µA (typ) Shutdown Supply Current
- 2V ±1% Reference Output
- VGATE Blanking During Transition
- Small 28-Pin QSOP Package
- 2-Cell to 4-Cell Li+ Battery to CPU Core Supply Converters
- 5V to CPU Core Supply Converters
The output voltage can be dynamically adjusted through the 5-bit digital-to-analog converter (DAC) over a 0.6V to 1.75V range. The MAX1718T has an internal multiplexer that accepts three unique 5-bit VID DAC codes corresponding to performance, battery, and suspend modes. Precision slew-rate control provides "just-in- time" arrival at the new DAC setting, minimizing surge currents to and from the battery.
A pair of complementary offset control inputs allows easy compensation for IR drops in PCB traces or creation of a voltage-positioned power supply. Voltage positioning modifies the load-transient response to reduce output capacitor requirements and total system power dissipation.
Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the 5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size.
The MAX1718T is available in a 28-pin QSOP package.