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LTC1439CG 数据表(PDF) 3 Page - Linear Technology |
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LTC1439CG 数据表(HTML) 3 Page - Linear Technology |
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3 / 32 page  3 LTC1438/LTC1439 ELECTRICAL CHARACTERISTICS T A = 25°C, VIN = 15V, VRUN/SS1,2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops IIN VOSENSE1,2 Feedback Current VPROG1, VPROG2 Pins Open (Note 2) 10 50 nA VOUT1,2 Regulated Output Voltage (Note 2) 1.19V (Adjustable) Selected VPROG1, VPROG2 Pins Open q 1.178 1.19 1.202 V 3.3V Selected VPROG1, VPROG2 = 0V q 3.220 3.30 3.380 V 5V Selected VPROG1, VPROG2 = INT VCC q 4.900 5.00 5.100 V VLINEREG1,2 Reference Voltage Line Regulation VIN = 3.6V to 20V (Note 2), VPROG1,2 Pins Open 0.002 0.01 %/V VLOADREG1,2 Output Voltage Load Regulation ITH1,2 Sinking 5µA (Note 2) q 0.5 0.8 % ITH1,2 Sourcing 5µA q – 0.5 – 0.8 % VSFB1 Secondary Feedback Threshold VSFB1 Ramping Negative q 1.16 1.19 1.22 V ISFB1 Secondary Feedback Current VSFB1 = 1.5V – 1 – 2 µA VOVL Output Overvoltage Lockout VPROG1,2, SENSE – 1 and VOSENSE1,2 Pins Open 1.24 1.28 1.32 V IPROG1,2 VPROG1,2 Input Current 0.5V > VPROG1,2 –3 – 6 µA INTVCC – 0.5V < VPROG1,2 < INTVCC 3 6 µA IQ Input DC Supply Current EXTVCC = 5V (Note 3) Normal Mode 3.6V < VIN < 30V, VAUXON = 0V 320 µA Shutdown VRUN/SS1,2 = 0V, 3.6V < VIN < 15V 16 30 µA VRUN/SS1,2 Run Pin Threshold q 0.8 1.3 2 V IRUN/SS1,2 Soft Start Current Source VRUN/SS1,2 = 0V 1.5 3 4.5 µA ∆VSENSE(MAX) Maximum Current Sense Threshold VOSENSE1,2 = 0V, 5V VPROG1,2 = Pins Open 130 150 180 mV TGL1, 2 tr, tf TGL1, TGL2 Transition Time Rise Time CLOAD = 3000pF 50 150 ns Fall Time CLOAD = 3000pF 50 150 ns TGS1, 2 tr, tf TGS1, TGS2 Transition Time Rise Time CLOAD = 500pF 100 150 ns Fall Time CLOAD = 500pF 50 150 ns BG1, 2 tr, tf BG1, BG2 Transition Time Rise Time CLOAD = 3000pF 50 150 ns Fall Time CLOAD = 3000pF 50 150 ns Internal VCC Regulator VINTVCC Internal VCC Voltage 6V < VIN < 30V, VEXTVCC = 4V q 4.8 5.0 5.2 V VLDO INT INTVCC Load Regulation IINTVCC = 20mA, VEXTVCC = 4V – 0.2 – 1 % VLDO EXT EXTVCC Voltage Drop IINTVCC = 20mA, VEXTVCC = 5V 170 300 mV VEXTVCC EXTVCC Switchover Voltage IINTVCC = 20mA, EXTVCC Ramping Positive q 4.5 4.7 V Oscillator and Phase-Locked Loop fOSC Oscillator Frequency COSC = 100pF, LTC1439: PLL LPF = 0V (Note 4) 112 125 138 kHz VCO High LTC1439, VPLLLPF = 2.4V 200 240 kHz RPLLIN PLLIN Input Resistance 50 k Ω IPLLLPF Phase Detector Output Current LTC1439 Sinking Capability fPLLIN < fOSC 10 15 20 µA Sourcing Capability fPLLIN > fOSC 10 15 20 µA Power-On Reset VSATPOR2 POR2 Saturation Voltage IPOR2 = 1.6mA, VOSENSE2 = 1V, 0.6 1 V VPROG2 Pin Open ILPOR2 POR2 Leakage VPOR2 = 12V, VOSENSE2 = 1.2V, VPROG2 Pin Open 0.2 1 µA VTHPOR2 POR2 Trip Voltage VPROG2 Pin Open % of VREF VOSENSE2 Ramping Negative – 11 – 7.5 – 4 % tDPOR2 POR2 Delay VPROG2 Pin Open 65536 Cycles |
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