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LTC1756 - Smart Card Interface

An internal charge pump DC/DC converter delivers regulated 3V or 5V to the Smart Card, while on-chip level shifters allow connection to a low voltage controller. All Smart Card contacts are rated for 10kV ESD, eliminating the need for external ESD protection devices.

Input voltage may range from 2.7V to 6.0V, allowing direct connection to a battery. Internal soft-start mitigates start-up problems that may result when the input power is provided by another regulator. Multiple devices may be paralleled and connected to a single controller for multicard applications.

Battery life is maximized by 60µA operating current and 1µA shutdown current. The narrow SSOP packages minimize PCB area for compact portable systems.

Features Fully ISO 7816-3 and EMV Compliant (Including Auxiliary I/O Pins) Buck-Boost Charge Pump Generates 3V or 5V 2.7V to 6.0V Input Voltage Range (LTC1755) Very Low Operating Current: 60µA >10kV ESD on All Smart Card Pins Dynamic Pull-Ups Deliver Fast Signal Rise Times Soft-Start Limits Inrush Current at Turn On 3V - 5V Signal Level Translators Shutdown Current: <1µA Short-Circuit and Overtemperature Protected Alarm Output Indicates Fault Condition Multiple Devices May Be Paralleled for Multicard Applications (LTC1755) Available in 16- and 24-Pin SSOP Packages Typical Application

Applications Handheld Payment Terminals Pay Telephones Key Chain Readers Smart Card Readers