AN6540

AN6540 4-pin Voltage Regulator with Adjustable Rise Time s Overview The AN6540 is an integrated circuit designed for a 4pin voltage regulator with adjustable rise time. An external capacitor allows any setting of output voltage rise time and noise reduction at power on, and are best suited for power circuits with current capacitance up to 240mA. It can be used up to the minimum input/output voltage difference 0.3V(typ.). 9.6 – 0.1 ø 3.1 4.0 + 0.5 Unit:mm 12.5max. s Features • Low dropout voltage:0.3V(typ.) • Control of output voltage rise time • Internal short-circuit protection • Low temperature coefficient of output voltage 2.3 2.3 2.3 0.7±0.2 3.3max. 9.0min. 3–1.0 1.8 2.0 0.5±0.1 1.5 1.3 4-pin SIL Plastic Package with Fin (SSIP004-P-0000) s Block Diagram 1 Input Q1 Current Source Pass Tr 4 Output R2 Error Amp. Rise Time Control Current Limiter Voltage Reference R1 2 Common CR 3 s Absolute Maximum Ratings (Ta=25˚C) Parameter Supply voltage Supply surge voltage Power dissipation (Tc=25˚C) Operating ambient temperature Storage temperature * t=200ms Symbol VCC Vsurge * PD Topr Tstg Rating 20 40 6 –30 to +80 –40 to +150 Unit V V W ˚C ˚C s Electrical Characteristics (Ta=25˚C) Parameter Output voltage Bias current Load regulation Line regulation Output voltage temperature coefficient Minimum input/output voltage difference Ripple rejection ratio Maximum output current Output short current Rise time Symbol VO Ibias REGL REGIN ∆VO/Ta VDIF (min.) Regin IO (max.) IOS tr Condition VI=13.2V, IO=200mA VI=13.2V, IO=200mA VI=13.2V, IO=0 to 200mA VI=9.5 to 16V, IO=100mA VI=13.2V, IO=100mA, Topr=–30 to+80˚C input/output voltage difference with input voltage 8.0V, IO=100mA VI=13.2V, IO=100mA, f=100Hz, ein=1VP–P VI=13.2V VI=13.2V Cr=10µF±10% ±0.01 0.3 50 240 50 0.5 1 600 160 2 0.6 min 8.1 typ 8.5 25 max 8.9 50 ±50 ±50 Unit V mA mV mV %/˚C V dB mA mA s Note) After the load short, return with I0=230mA or over. s Characteristics Curve tr – Cr 100 50 8 7 PD –Ta 8.8 8.7 VO –VI Power Dissipation PD (W) Rise Time tr (s) 10 5 3 2 1 0.5 0.3 0.2 0.1 1 2 3 5 10 20 30 50 100 5 4 3 2 Output Voltage VO (V) 30 20 IO=0mA i fin In 6 C 5˚ 15 8.6 8.5 8.4 8.3 8.2 8.1 8.0 te He at Si Witho /W ˚C 1 0 ut Hea He /W 100mA 200mA at He nk Si nk Si nk at t Sink 0 20 40 60 80 100 120 140 160 6 8 10 12 14 16 18 Capacity Cr (µF) Ambient Temperature Ta (˚C) Input Voltage VI (V) VO –VDIF 8.7 8.6 8.8 VO –Ta 10 8.7 VO – IO VI=13.2V IO=100mA VI=13.2V 9 8 IO=0mA Output Voltage VO (V) Output Voltage VO (V) 8.4 8.3 8.2 8.1 8.0 7.9 100mA 200mA Output Voltage VO (V) 20 40 60 80 8.5 8.6 8.5 8.4 8.3 8.2 8.1 8.0 –40 7 6 5 4 3 2 1 0 0.1 0.2 0.3 0.4 0.5 0.6 –20 0 0 0 100 200 300 400 Input/Output Voltage Difference VDIF (V) Ambient Temperature Ta (˚C) Output Current IO (mA) s Basic Regulator Circuit VI 1 4 VO AN6540 + 1µF + – 2 3 – Cr + – 47µF Note) Choose the oscillation control capacitor 47µF which has a small capacitance reduction even at a low temperature. For example, use the tantalum capacitor.