SPECIFICATION NOTICE LT1512 September 1998 The LT®1512 is now available in the GN package (16-pin narrow SSOP). Functional changes are described below. All other specifications remain unchanged. For complete specifications, typical performance characteristics and applications information, please see the LT1512 data sheet. , LTC and LT are registered trademarks of Linear Technology Corporation. U W U PACKAGE/ORDER INFORMATION TOP VIEW *GND 1 16 GND* VC 2 15 NC NC 3 14 GND FB 4 13 VSW IFB 5 12 GND SHDN 6 11 GND S SYNC 7 10 VIN *GND 8 9 ORDER PART NUMBER * The four corner pins (1, 8, 9, 16) are fused to the internal leadframe to lower thermal resistance. These pins should be connected to copper plane areas on the board for proper heat sinking. The θJA value is preliminary. LT1512CGN LT1512IGN GN PART MARKING GND* GN PACKAGE (0.015 INCH) 16-LEAD NARROW PLASTIC SSOP TJMAX = 125°C, θJA = 75°C/W 1512 1512I U U U PIN FUNCTIONS The GN package has the Shutdown and Synchronization (S/S) functions brought out to separate pins. The functions remain the same. SHDN (Pin 6): The shutdown pin will default to a high ON state when floated. A logic state will shut down the charger to a micropower state. The shutdown pin is logic level compatible but can be tied to VIN if desired. SYNC (Pin 7): The SYNC pin can be used to synchronize the switching frequency of the device. Driving the SYNC pin with a continuous switching logic signal of 600kHz to 800kHz will synchronize switching frequency to the external signal. If the synchronization function is not used, the SYNC pin should be grounded. For further information regarding this specification notice contact: Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, California 95035-7417 Attn: Product Marketing Manager Phone: (408) 432-1900 sn1512 ©1998 LT/HP 0998 • PRINTED IN USA