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UCC29422 Datasheet(PDF) 3 Page - Texas Instruments |
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UCC29422 Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 35 page  UCC29421, UCC29422, UCC39421, UCC39422 MULTIMODE HIGHFREQUENCY PWM CONTROLLER SLUS246C − OCTOBER 1999 − REVISED FEBRUARY 2005 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics over recommended operating free-air temperature range, TA = −40°C to 85 °C for the UCC2942x, 0°C to 70°C for the UCC3942x, RT = 100 kΩ, VVPUMP = 6 V, VVIN = 3 V. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS VIN Section Minimum start−up voltage 1.5 1.8 V Operating current Not in PFM mode, No load 35 60 µA Sleep mode current PFM mode, No load 35 60 µA Shutdown supply current SYNC/SD = high 1.5 4 µA Startup frequency VIN = 1.8 V 60 120 190 kHz Startup off time VIN = 1.8 V 2 5 µs Startup CS threshold VIN = 1.8 V 36 56 mV Minimum PUMP or VOUT voltage to exit startup 2.2 2.5 2.8 V VPUMP Section Regulation voltage VVOUT=3.3 V, See Note 1 5.0 6.6 V Operating current Outputs OFF 100 275 µA Sleep mode current 5 15 µA Shutdown supply current SYNC/SD = High, VOUT = 3 V, VVPUMP = 3 V 2 5 µA CP voltage to turn-on pump switch VVPUMP = 5 V 5.3 5.5 V Pump switch Rds(on) 4 Ω VOUT Section Operating current 300 500 650 µA Sleep mode current 50 100 150 µA Shutdown supply current SYNC/SD = High 1 2.2 µA VPUMP to VOUT threshold to enable N-channel rectifier VOUT = 3.3 V 1.4 1.7 2.0 V Error Amplifier Section Regulation voltage 2 V < VIN < 5 V 1.205 1.235 1.265 V FB input current VFB = 1.25 V 100 350 nA Max sinking current, IOL VCOMP = 1 V, VFB = regulation roltage +50 mV 6.5 13 20 µA Max sourcing current, IOH VCOMP = 0 V, VFB = regulation voltage –50 mV –20 –13 –6.5 µA Transconductance VFB = regulation voltage ±4 mV 150 270 370 µs Unity gain bandwidth CC = 330 pF, See Note 1 100 kHz Max output voltage VFB = 0 V 1.6 1.9 2.3 V Oscillator Section RT = 350 kΩ 100 150 190 kHz Frequency stability RT = 100 kΩ 375 475 575 kHz Frequency stability RT = 35 kΩ 0.9 1.2 1.4 MHz RT voltage 0.600 0.625 0.650 V SYNC/shutdown threshold 0.9 1.2 1.6 V SYNC input current SYNC/SD = 2.5 V 200 nA Minimum SYNC pulse width See Note 1 50 ns Maximum SYNC high time To avoid shutdown 11 20 29 µs SYNC range fo = measured frequency at RT = 100 kΩ 1.1 fo 1.7 fo kHz NOTE 1: Ensured by design. Not production tested. |
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