Features

• Wide Input Range: 3.3V to 60V
• 3A Peak Switch Current
• Burst Mode® Operation: 100µA Quiescent Current**
• Low Shutdown Current: IQ < 1µA
• Power Good Flag with Programmable Threshold
• Load Dump Protection to 60V
• 200kHz Switching Frequency
• Saturating Switch Design: 0.1Ω
• Peak Switch Current Maintained Over Full Duty Cycle Range*
• 1.25V Feedback Reference Voltage
• Easily Synchronizable
• Soft-Start Capability
• Small 16-Pin Thermally Enhanced TSSOP Package

Typical Application

Description

Innovative design techniques integrated in a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by employing Burst Mode operation at low currents, utilizing the output to bias the internal circuitry, and by using a supply boost capacitor to fully saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range.* Shutdown reduces input supply current to less than 1µA. External synchronization can be implemented by driving the SYNC pin with logic-level inputs. A single capacitor from the CSS pin to the output provides a controlled output voltage ramp (soft-start). The device also has a power good flag with a programmable threshold and time-out, and thermal shutdown protection.

The LT3434 is available in a 16-pin TSSOP package with exposed pad leadframe for low thermal resistance.