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16-Pin GN and SO Packages PGND (Pin 3): Power G round. The internal driver circuitry returns to this pin. PGND should be connected to a low impedance ground plane in close proximity to the NiCd batte ry cell. SHDN (Pin 6): Chip Shutdown. A TTL-compatible active low voltage at SHDN puts the LTC1559 into low power shutdown mode. In shutdown, all internal circuits power down and are held in a reset state. The SW, CTL and VBAK pins enterinto high impedance states. In shutdown mode, supply current drops to below 500d\ and current drawn from the backup cell drops to below 150dV