General Description
The MIC23350 is a high-efficiency, low-voltage, 3A
synchronous step-down regulator. The
Constant-ON-Time (COT) control architecture with
HyperLight Load® provides very high efficiency at light
loads, while still having ultra-fast transient response.
The MIC23350 output voltage is set by two VSEL
(Voltage Selection) pins, between nine different values.
This method eliminates the need for an external
feedback resistor divider and improves the output
voltage setting accuracy.
The 2.4V to 5.5V input voltage range, low shutdown
and quiescent currents make the MIC23350 ideal for
single-cell Li-Ion battery-powered applications. The
100% duty cycle capability provides low dropout
operation, extending operating range in portable
systems.
The MIC23350 pinout is compatible with the MIC23356
I2C-based programmable regulator version, such that
applications can be easily converted. An open-drain
Power Good output is provided to indicate when the
output voltage is within 9% of regulation and facilitates
the interface with an MCU, or power sequencing. If set
in shutdown (EN=GND), the MIC23350 typically draws
1.5 μA, while the output is discharged through 10
pull-down.
The MIC23350 is available in a thermally efficient, 16
Lead 2.5 mm x 2.5 mm x 0.55 mm thin FTQFN
package, with an operating junction temperature range
from –40°C to +125°C.

Features
• 2.4V to 5.5V Input Voltage Range
• 3A Continuous Output Current
• Pin Strapping Voltage Selection:
- Three-State pins (nine voltage options)
- 0.6V, 0.8V, 0.9V, 1.0V, 1.2V, 1.5V, 1.8V, 2.5V
or 3.3V output voltage
• Reduced Component Count (No Feedback
Resistors)
• High Efficiency (up to 95%)
• Output Discharge when Disabled
• Constant-ON-Time Control with High Switching
Frequency:
- 1.2 MHz typical at 1.0V output voltage
• ±1.5% Output Voltage Accuracy Over
Line/Load/Temperature Range
• 0.8 ms/V Soft Start Speed
• Supports Safe Start-Up with Pre-Biased Output
• Typical 1.5 μA Shutdown Supply Current
• Low Dropout Operation (100% Duty Cycle)
• Ultra-Fast Transient Response
• Latch-Off Thermal Shutdown Protection
• Latch-Off Current Limit Protection
• Power Good (PG) Open-Drain Output

Applications
• Solid State Drives (SSD)
• FPGAs, DSP and Low-Voltage ASIC Power