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TPS40222
SLUS642A – OCTOBER 2005 – REVISED JANUARY 2006
1.6-A, 1.25-MHz BUCK CONVERTER IN A 3 mm × 3 mm SON PACKAGE
FEATURES
• Input Voltage Range 4.5 VDC to 8 VDC • Output Voltage (0.8 V to 90% VIN) • 0 A to 1.6 A Current Capability • Fixed 1.25-MHz Switching Frequency • Reference 0.8 V ±1% • Internal 250 mΩ N-Channel MOSFET Switch • Current Mode Control with Internal Slope
Compensation
• Internal Soft-Start • Internal Loop Compensation • Short Circuit Protection • Thermal Shutdown • High Efficiency Up to 92% • Small 3 mm × 3 mm SON Package
η − Efficiency − %
100 VIN = 5 V
95
TYPICAL EFFICIENCY vs
LOAD CURRENT
90
85
VOUT = 3.3 V
80
75 70
VOUT = 1.
TPS40222 Datasheet
