The LT8610AC/LT8610AC-1 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current. Compared to the LT8610AB, the LT8610AC/LT8610AC-1 has a lower feedback voltage of 800mV and a lower minimum VIN of 3V. The LT8610AC/LT8610AC-1 has the same additional features of the LT8610AB as compared to the LT8610: higher maximum output current of 3.5A, faster minimum on time of 30ns, and higher light load efficiency.
The LT8610AC/LT8610AC-1 has a SYNC pin for synchronization to an external clock. A capacitor on the TR/SS pin programs the output voltage ramp rate during startup. The PG flag signals when VOUT is within ±8% of the programmed output voltage as well as fault conditions. The LT8610AC-1 has internal compensation optimized for high switching frequencies resulting in improved transient response compared to the LT8610AC. The LT8610AC-1 also has a feature which will soft-start the part when exiting dropout or brownout conditions reducing output voltage overshoot.
Feedback VoltageMin VINOutput CurrentNotesLT8610AC-10.80V3.0V3.5AFSW = 1.5MHz to 2.2MHz, Optimized Transient ResponseLT8610AC0.80V3.0V3.5AFSW = 200kHz to 2.2MHzLT8610AB0.97V3.4V3.5AImproved Burst Mode EfficiencyLT8610AX0.97V3.4V3.5A175°C Max Junction TempLT8610A0.97V3.4V3.5AHigher IOUT, 30ns Min On TimeLT86100.97V3.4V2.5A-Feature
- LT8610 Feature Set, Plus:
- 3V Minimum Input Voltage
- 800mV Feedback Voltage
- 3.5A Maximum Output Current
- Fast 30ns Minimum Switch-On Time
- Improved Burst Mode Efficiency
- Improved EMI
- Wide Input Voltage Range: 3V to 42V
- Ultralow Quiescent Current Burst Mode® Operation:
- 2.5μA IQ Regulating 12VIN to 3.3VOUT
- High Efficiency Synchronous Operation:
- 95% Efficiency at 1A, 5VOUT from 12VIN
- 93% Efficiency at 1A, 3.3VOUT from 12VIN
- Low Dropout Under All Conditions: 200mV at 1A
- Safely Tolerates Inductor Saturation in Overload
- Adjustable and Synchronizable Frequency:
- LT8610AC: 200kHz to 2.2MHz
- LT8610AC-1: 1.5MHz to 2.2MHz
- Accurate 1.015V Enable Pin Threshold
- Output Soft-Start and Tracking
- Small Thermally Enhanced 16-Lead MSOP Package
Applications
- Automotive and Industrial Supplies
- GSM Power Supplies
