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2.3 Power Supply Setup
3 Shutdown
DVDD
SHUTDOWN
>50 sm >50 sm
4 Component Selection
4.1 Charge Pump
Shutdown
To power up the EVM, one power supply is needed. The power supply is connected to the EVM using a
2-pin, 2,54-mm pin header, J10.
Table 2. Recommended Supply Voltage
Description Voltage Limitations Current Requirement Cable
Power supply 1.8 V to 4.5 V 0.3 A
CAUTION
Applying voltages above the limitations given in Table 2 may cause permanent
damage to your hardware.
For minimum click and pop during power on and power off, the shutdown pin should be kept low. The
preferred power-up/down sequence is shown in Figure 4 .
Figure 4. Power-Up/Down Sequence
The charge pump flying capacitor, C13, serves to transfer charge during the generation of the negative
supply voltage. The PVSS capacitor must be at least equal to the charge pump capacitor in order to allow
maximum charge transfer. Low ESR capacitors are an ideal selection, and a value of 1 µ F is typical.
Capacitor values smaller than 1 µ F can be used, but the maximum output can be reduced. It is therefore
recommended to validate the design with thorough testing.
SLOU215 – January 2008 DRV601EVM 5
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