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ISSUED DATE :2004/02/10

REVISED DATE :2004/11/23C

Application Information

Step-Up Converter

Test

Conditions

Results

Line Regulation

Vin= 8V to 16V, Io = 175mA

30mV = ± 0.05%

Load Regulation

Vin = 12V, Io = 75mA to 175 mA

10mV = ± 0.017%

Output Ripple

Vin = 12V,Io = 175mA

400mVp-p

Efficiency

Vin = 12V, Io = 175mA

87.7%

Output Ripple With Optional Filter Vin = 12V, Io = 175mA

40mVp-p

External Current Boost Connections for Ic Peak Greater than 1.5A

External NPN Switch

External NPN Saturated Switch (NOTE)

NOTE

If the switch is driven into hard saturation (non-Darlington configuration) at low switch currents ( 300mA) and high driver currents ( 30mA) it may

take up to 2.0 us to come out of saturation. This condition will shorten the off time at frequencies 30kHz, and is magnified at high temperatures. This

condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non-Darlington configuration is used, the

following output drive condition is recommended.