Datasheet LT1943 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | High Current Quad Output Regulator for TFT LCD Panels |
| Pages / Page | 20 / 2 — ABSOLUTE AXI U. RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL … |
| File Format / Size | PDF / 278 Kb |
| Document Language | English |
ABSOLUTE AXI U. RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL CHARACTERISTICS The
Model Line for this Datasheet
Text Version of Document
LT1943
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
TOP VIEW ORDER PART VIN Voltage .. 25V GND 1 28 SW2 NUMBER BOOST Voltage .. 36V VC1 2 27 SW2 BOOST Voltage Above SW1 ... 25V VC2 3 26 V LT1943EFE ON BIAS Pin Voltage ... 18V FB1 4 25 CT SW2, SW4 Pin Voltages .. 40V FB2 5 24 E3 FB3 6 23 PGOOD SW3 Voltage .. 40V NFB4 7 22 BIAS 29 FB1, FB2, FB3, FB4 Voltages .. 4V FB4 8 21 SW3 NFB4 Voltage .. +6V, –0.6V VC3 9 20 GND VC4 10 19 SW4 VC1, VC2, VC3, VC4 Pin Voltages .. 6V SGND 11 18 RUN-SS FE PART MARKING RUN-SS, SS-234 Pin Voltages ... 6V BOOST 12 17 SS-234 PGOOD Pin Voltage ... 36V SW1 13 16 VIN 1943E SW1 14 15 V E3 Pin Voltage ... 38V IN V FE PACKAGE ON Voltage ... 38V 28-LEAD PLASTIC TSSOP C EXPOSED PAD (PIN 29) IS GROUND T Pin Voltage ... 6V (MUST BE SOLDERED TO PCB) Junction Temperature ... 125°C TJMAX = 125°C, θJA = 25°C/W, θJC = 7.5°C/W Operating Temperature Range (Note 2) ...–40°C to 85°C Storage Temperature Range ..–65°C to 150°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Lead Temperature (Soldering, 10 sec).. 300°C
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 12V, RUN-SS, SS-234 = 2.5V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage ● 4.5 V Maximum Input Voltage 22 V Quiescent Current Not Switching 10 14 mA RUN-SS = SS-234 = 0V 35 45 µA RUN-SS, SS-234 Pin Current RUN-SS, SS-234 = 0.4V 1.7 µA RUN-SS, SS-234 Threshold 0.8 V BIAS Pin Voltage to Begin SS-234 Charge ● 2.4 2.8 3.15 V BIAS Pin Current BIAS = 3.1V, All Switches Off 10.5 15 mA FB Threshold Offset to Begin CT Charge (Note 3) 90 125 160 mV CT Pin Current Source All FB Pins = 1.5V 16 20 25 µA CT Threshold to Power VON All FB Pins = 1.5V 1.0 1.1 1.2 V VON Switch Drop VON Current = 30mA 180 240 mV Maximum VON Current VE3 = 30V ● 30 60 mA PGOOD Threshold Offset 90 125 160 mV PGOOD Sink Current 200 µA PGOOD Pin Leakage VPGOOD = 36V 1 µA Master Oscillator Frequency 1.1 1.2 1.35 MHz ● 1.0 1.46 MHz Foldback Switching Frequency All FB Pins = 0V 250 kHz Frequency Shift Threshold on FB ∆200kHz 0.5 V 1943fa 2
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
TOP VIEW ORDER PART VIN Voltage .. 25V GND 1 28 SW2 NUMBER BOOST Voltage .. 36V VC1 2 27 SW2 BOOST Voltage Above SW1 ... 25V VC2 3 26 V LT1943EFE ON BIAS Pin Voltage ... 18V FB1 4 25 CT SW2, SW4 Pin Voltages .. 40V FB2 5 24 E3 FB3 6 23 PGOOD SW3 Voltage .. 40V NFB4 7 22 BIAS 29 FB1, FB2, FB3, FB4 Voltages .. 4V FB4 8 21 SW3 NFB4 Voltage .. +6V, –0.6V VC3 9 20 GND VC4 10 19 SW4 VC1, VC2, VC3, VC4 Pin Voltages .. 6V SGND 11 18 RUN-SS FE PART MARKING RUN-SS, SS-234 Pin Voltages ... 6V BOOST 12 17 SS-234 PGOOD Pin Voltage ... 36V SW1 13 16 VIN 1943E SW1 14 15 V E3 Pin Voltage ... 38V IN V FE PACKAGE ON Voltage ... 38V 28-LEAD PLASTIC TSSOP C EXPOSED PAD (PIN 29) IS GROUND T Pin Voltage ... 6V (MUST BE SOLDERED TO PCB) Junction Temperature ... 125°C TJMAX = 125°C, θJA = 25°C/W, θJC = 7.5°C/W Operating Temperature Range (Note 2) ...–40°C to 85°C Storage Temperature Range ..–65°C to 150°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Lead Temperature (Soldering, 10 sec).. 300°C
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 12V, RUN-SS, SS-234 = 2.5V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage ● 4.5 V Maximum Input Voltage 22 V Quiescent Current Not Switching 10 14 mA RUN-SS = SS-234 = 0V 35 45 µA RUN-SS, SS-234 Pin Current RUN-SS, SS-234 = 0.4V 1.7 µA RUN-SS, SS-234 Threshold 0.8 V BIAS Pin Voltage to Begin SS-234 Charge ● 2.4 2.8 3.15 V BIAS Pin Current BIAS = 3.1V, All Switches Off 10.5 15 mA FB Threshold Offset to Begin CT Charge (Note 3) 90 125 160 mV CT Pin Current Source All FB Pins = 1.5V 16 20 25 µA CT Threshold to Power VON All FB Pins = 1.5V 1.0 1.1 1.2 V VON Switch Drop VON Current = 30mA 180 240 mV Maximum VON Current VE3 = 30V ● 30 60 mA PGOOD Threshold Offset 90 125 160 mV PGOOD Sink Current 200 µA PGOOD Pin Leakage VPGOOD = 36V 1 µA Master Oscillator Frequency 1.1 1.2 1.35 MHz ● 1.0 1.46 MHz Foldback Switching Frequency All FB Pins = 0V 250 kHz Frequency Shift Threshold on FB ∆200kHz 0.5 V 1943fa 2
