Features

• Ultrawide Input Voltage Range: 3V to 100V
• Boundary Mode Switching for Highest Efficiency
• Output Voltage Range: 0.8V to 60V
• Internal Synchronous Switches
• Burst Mode® Operation:
  16μA I_Q at 12V_IN to 5V_OUT
  7μA I_Q at 48V_IN to 5V_OUT
• Low Dropout: 99% Maximum Duty Cycle
• Peak Current Mode Control
• Programmable Undervoltage Lockout
• Power Good Flag
• Flexible Output Voltage Tracking
• Short-Circuit Protection
• Low Shutdown Current: 5μA
• Tolerates Pin Open/Short Faults
• Thermally Enhanced 20-Lead TSSOP with High Voltage Lead Spacing

Typical Application

Description

The LT®8630 is a current mode PWM step-down DC/DC converter with internal synchronous switches that provide current for output loads up to 0.6A. The wide input range of 3V to 100V makes the LT8630 suitable for regulating power from a wide variety of sources, including automotive and industrial systems and 36V to 72V telecom supplies. Variable frequency boundary mode switching maximizes efficiency across a wide range of input voltages. Low ripple Burst Mode operation enables high efficiency operation down to very low output currents while keeping the output ripple below 5mV. The soft-start feature controls the ramp rate of the output voltage, eliminating input current surge during start-up, while also providing output tracking. A power good flag signals when the output voltage is within ±7.5% of the regulated output. Undervoltage lockout can be programmed using the EN/UV pin. Shutdown mode reduces the total quiescent current to < 5μA. The LT8630 is available in a 20-lead TSSOP package with exposed pad for low thermal resistance and high voltage lead spacing.