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LTC1623CMS8 Datasheet(PDF) 8 Page - Linear Technology |
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LTC1623CMS8 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LTC1623 Address The LTC1623 has an address of 1011XXX; the four MSBs are hard-wired, but the 3 LSBs are programmed by the user with the help of two three-state address pins. Refer to Table 1 for the pin configurations and their corresponding addresses. To conserve standby current, it is preferable to tie the address pins to either VCC or GND. If more than four addresses are needed, then either one of the address pins can be tied to the third state of VCC/2 by using two equal value resistors ( ≤1M) shown in Figure 2. Do not connect both address pins to the VCC/2 state simultaneously because this is not a valid address. Charge Pump To fully enhance the external N-channel switches, an internal charge pump is used to boost the output gate drive to a minimum of 2.7V and a maximum of 6V above VCC, depending on VCC itself. The reason for the maximum output voltage limit is to avoid switch gate source break- down due to excessive gate overdrive. A feedback network is used to limit the charge pump output to 6V above VCC. Because the output will only need to drive the gate of the external switch by charging and discharging the parasitic gate capacitances, the internal charge pump, clocked by an approximately 300KHz oscillator, is appropriately sized to source less than 100 µA. Power-On Reset and Undervoltage Lockout The LTC1623 starts up with both gate drives low. An internal power-on reset (POR) signal inhibits operation until about 300 µs after VCC crosses the undervoltage lockout threshold (typically 2V). The circuit includes some hysteresis and delay to avoid nuisance resets. Once opera- tion begins, VCC must drop below the threshold for at least 100 µs to trigger another POR sequence. During standby, when both gate drive outputs are dis- abled, quiescent current is kept to a minimum (13 µA typical) because only the UVLO block is active. Input Threshold Anticipating the trend toward lower supply voltages, the SMBus is specified with a VIH of 1.4V and a VIL of 0.6V. While some SMBus parts may violate this stringent SMBus specification by allowing a higher VIH value for a corre- spondingly higher input supply voltage, the LTC1623 meets and maintains the constant SMBus input threshold specification across the entire supply voltage range of 2.7V to 5.5V. Figure 2. LTC1623 Programmed with Address 1011001 1 2 3 4 8 7 6 5 VCC GA GB AD1 DATA CLK AD0 GND DATA CLOCK LTC1623 LOAD1 1M 1M LOAD2 1623 F02 Table 1. Address Pin Truth Table AD0 AD1 ADDRESS GND GND 1011000 GND VCC/2 1011001 GND VCC 1011010 VCC/2 GND 1011011 VCC/2 VCC/2 UNUSED VCC/2 VCC 1011100 VCC GND 1011101 VCC VCC/2 1011110 VCC VCC 1011111 OPERATIO |
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