Datasheet LTC1923 (Analog Devices) - 3
| Fabricante | Analog Devices |
| Descripción | High Efficiency Thermoelectric Cooler Controller |
| Páginas / Página | 28 / 3 — ELECTRICAL CHARACTERISTICS The |
| Formato / tamaño de archivo | PDF / 458 Kb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS The
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LTC1923
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VDD = 5V, RSLEW = VDD, SDSYNC = VDD, RT = 10k, CT = 330pF unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Reference
VREF Reference Output Voltage No Load 2.462 2.5 2.538 V ● 2.450 2.550 V VREFGD VREF Good Threshold VREF Rising Threshold ● 2.25 2.45 V LDREG Load Regulation ILOAD = –1mA to –10mA 10 25 mV LINEREG Line Regulation VDD = 2.7V to 5.5V 5 20 mV VREFISC Short-Circuit Current VREF = 0V 10 20 mA
Oscillator and Phase-Locked Loop
fOSCI Initial Oscillator Frequency RT = 10k, CT = 330pF 190 225 260 kHz fOSC Frequency Variation VDD = 2.7V to 5V, CT = 330pF, RT = 10k ● 165 225 270 kHz OSCPK CT Ramp Peak 1.4 1.5 1.6 V OSCVLY CT Ramp Valley 0.4 0.5 0.6 V CTICH CT Charge Current CT = 0.3V, RT = 10k –150 µA CTIDIS CT Discharge Current CT = 1.8V, RT = 10k 150 µA PLLGAIN Gain from PLLLPF to RT – 1.1 – 0.9 – 0.7 V/V IPLLLPF Phase Detector Output Current Sinking fSYNC < fOSC 12 µA Sourcing fSYNC > fOSC –12 µA MSTTH Master Threshold On PLLLPF Pin Measured at SDSYNC Pin VDD – 0.7 VDD – 0.4 V SDDLY Shutdown Delay to Output 20 45 µs
Error Amplifier
VOS Input Offset Voltage EAOUT = 1V, VCM = 2.5V –18 18 mV AOL Open-Loop Gain EAOUT = 0.45V to 1.55V, CNTRL = 2.5V 80 dB VCM Common Mode Input Range EAOUT = 1V 0.2 VDD + 0.2 V IIB FB and CNTRL Input Bias Currents FB = CNTRL = 1.25 – 100 100 nA VOH Output High ILOAD = – 100µA 1.65 V VOL Output Low ILOAD = 100µA 0.3 0.45 V ISOURCE Sourcing Current EAOUT = 1V, FB = 2.4V, CNTRL = 2.5V –1.5 – 0.5 mA ISINK Sinking Current EAOUT = 1V, FB = 5V, CNTRL = 2.5V 1 2 mA GBW Gain-Bandwidth Product f = 100kHz (Note 3) 2 MHz
Current Sense Amplifier
ACS Amplifier Gain 10 V/V CSOFF Amplifier Offset Measured at ITEC – 15 – 2 10 mV ITECH Output Sourcing Load Regulation CS + - CS– = 100mV, ILOAD = 0 to – 50µA 0.1 0.2 V ITECL Output Sinking Load Regulation CS + - CS– = 100mV, ILOAD = 0 to 50µA 0.1 0.2 V f3dB –3dB Frequency (Note 3) 500 kHz ILIMTH Current Limit Threshold Measured at CS+, CS– ● 125 145 165 mV ILIMDLY Current Limit Delay to Output 300 450 ns SSICHG Soft-Start Charge Current SS = 0.75V – 2.5 – 1.5 – 0.5 µA SSILIM Soft-Start Current Limit Threshold SS = 0.5V, Measured at CS+, CS– 50 70 90 mV ILIM ILIM Current Limit Threshold ILIM = 0.5V, Measured at CS+, CS– 50 70 90 mV 1923f 3
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VDD = 5V, RSLEW = VDD, SDSYNC = VDD, RT = 10k, CT = 330pF unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Reference
VREF Reference Output Voltage No Load 2.462 2.5 2.538 V ● 2.450 2.550 V VREFGD VREF Good Threshold VREF Rising Threshold ● 2.25 2.45 V LDREG Load Regulation ILOAD = –1mA to –10mA 10 25 mV LINEREG Line Regulation VDD = 2.7V to 5.5V 5 20 mV VREFISC Short-Circuit Current VREF = 0V 10 20 mA
Oscillator and Phase-Locked Loop
fOSCI Initial Oscillator Frequency RT = 10k, CT = 330pF 190 225 260 kHz fOSC Frequency Variation VDD = 2.7V to 5V, CT = 330pF, RT = 10k ● 165 225 270 kHz OSCPK CT Ramp Peak 1.4 1.5 1.6 V OSCVLY CT Ramp Valley 0.4 0.5 0.6 V CTICH CT Charge Current CT = 0.3V, RT = 10k –150 µA CTIDIS CT Discharge Current CT = 1.8V, RT = 10k 150 µA PLLGAIN Gain from PLLLPF to RT – 1.1 – 0.9 – 0.7 V/V IPLLLPF Phase Detector Output Current Sinking fSYNC < fOSC 12 µA Sourcing fSYNC > fOSC –12 µA MSTTH Master Threshold On PLLLPF Pin Measured at SDSYNC Pin VDD – 0.7 VDD – 0.4 V SDDLY Shutdown Delay to Output 20 45 µs
Error Amplifier
VOS Input Offset Voltage EAOUT = 1V, VCM = 2.5V –18 18 mV AOL Open-Loop Gain EAOUT = 0.45V to 1.55V, CNTRL = 2.5V 80 dB VCM Common Mode Input Range EAOUT = 1V 0.2 VDD + 0.2 V IIB FB and CNTRL Input Bias Currents FB = CNTRL = 1.25 – 100 100 nA VOH Output High ILOAD = – 100µA 1.65 V VOL Output Low ILOAD = 100µA 0.3 0.45 V ISOURCE Sourcing Current EAOUT = 1V, FB = 2.4V, CNTRL = 2.5V –1.5 – 0.5 mA ISINK Sinking Current EAOUT = 1V, FB = 5V, CNTRL = 2.5V 1 2 mA GBW Gain-Bandwidth Product f = 100kHz (Note 3) 2 MHz
Current Sense Amplifier
ACS Amplifier Gain 10 V/V CSOFF Amplifier Offset Measured at ITEC – 15 – 2 10 mV ITECH Output Sourcing Load Regulation CS + - CS– = 100mV, ILOAD = 0 to – 50µA 0.1 0.2 V ITECL Output Sinking Load Regulation CS + - CS– = 100mV, ILOAD = 0 to 50µA 0.1 0.2 V f3dB –3dB Frequency (Note 3) 500 kHz ILIMTH Current Limit Threshold Measured at CS+, CS– ● 125 145 165 mV ILIMDLY Current Limit Delay to Output 300 450 ns SSICHG Soft-Start Charge Current SS = 0.75V – 2.5 – 1.5 – 0.5 µA SSILIM Soft-Start Current Limit Threshold SS = 0.5V, Measured at CS+, CS– 50 70 90 mV ILIM ILIM Current Limit Threshold ILIM = 0.5V, Measured at CS+, CS– 50 70 90 mV 1923f 3