LT1766

Input Voltage (V_IN)................................................. 60V
BOOST Pin Above SW..............................................35V
BOOST Pin Voltage................................................. 68V
SYNC, SENSE Voltage (LT1766-5).............................7V
SHDN Voltage...........................................................6V
BIAS Pin Voltage.................................................... 30V
FB Pin Voltage/Current (LT1766)...................3.5V/2mA
Operating Junction Temperature Range
LT1766EFE/LT1766EFE-5/LT1766EGN/
LT1766EGN-5 (Note 8,10)...................40°C to 125°C
LT1766IFE/LT1766IFE-5/
LT1766IGN/LT1766IGN-5 (Note 8,10) 40°C to 125°C
Storage Temperature Range..............65°C to 150°C
Lead Temperature (Soldering, 10 sec)..............300°C

The LT® 1766/LT1766-5 are 200kHz monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 1.5A, 0.2Ω switch is included on the die along with all the necessary oscillator, control and logic cir-cuitry. A current mode control architecture delivers fast transient response and excellent loop stability.

Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry*maintains peak switch current over the full duty cycle range.A shutdown pin reduces supply current to 25µA and the device can be externally synchronized from 228kHz to 700kHz with logic level inputs.

The LT1766/LT1766-5 are available in a 16-pin fused-lead SSOP package or a TSSOP package with exposed backside