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| A6902D_08 |
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 STMICROELECTRONICS
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6 page 
A6902D 4 Electrical characteristics Table 4. Electrical characteristics (TJ = -40 to 125 °C, VCC = 12 V, unless otherwise specified) Symbol Parameter Test conditions Min Typ Max Unit VCC Operating input voltage range V0 = 1.235 V; I0 = 2 A 8 36 V RDS(on) Mosfet on resistance 0.250 0.5 Ω IL Maximum limiting current VCC = 8.5 V 1.8 2.5 3.2 A fSW Switching frequency 212 250 280 kHz Duty cycle 0 100 % Dynamic characteristics (see test circuit). V5 Voltage feedback 8 V < VCC < 36 V, 20 mA < I0 < 1 A 1.198 1.235 1.272 V η Efficiency V0 = 5 V, VCC = 12 V 90 % DC characteristics Iqop Total operating quiescent current 35 mA Iq Quiescent current Duty cycle=0; VFB=1.5 V 2.7 mA Error amplifier VOH High level output voltage VFB=1 V 3.6 V VOL Low level output voltage VFB=1.5 V 0.4 V Io source Source output current VCOMP = 1.9 V; VFB = 1 V 160 300 µA Io sink Sink output current VCOMP = 1.9 V; VFB = 1.5 V 11.5 mA Ib Source bias current 2.5 4 µA DC open loop gain RL= 50 58 dB gm Transconductance ICOMP = -0.1 mA to 0.1 mA; VCOMP = 1.9 V 2.3 mS VOFFS Input offset voltage VCS- = 1.8 V; VCS+ = Vcomp 90 100 110 mV ICS+ CS+ output current I0 =1 A; RSENSE =100 mΩ; VOUT < VCC-2 V 1.5 3 µA ICS- CS- output current I0 =1A; RSENSE =100 mΩ; VOUT < VCC-2 V 1.5 3 µA |
