Datasheet LT1950 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | Single Switch PWM Controller with Auxiliary Boost Converter |
| Pages / Page | 20 / 2 — ABSOLUTE AXI U. RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL … |
| File Format / Size | PDF / 223 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
LT1950
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
ORDER PART BOOST ... –0.3V to 35V TOP VIEW NUMBER COMP 1 16 V V SEC IN, VIN2, SHDN ... –0.3V to 25V FB 2 15 VIN FB, SYNC, VSEC ... –0.3V to 6V LT1950EGN R 3 14 OSC BOOST COMP, BLANK .. –0.3V to 3.5V SYNC 4 13 PGND LT1950IGN SLOPE .. –0.3V to 2.5V SLOPE 5 12 GATE V 6 11 I REF VIN2 SENSE ... –0.3V to 1V SHDN 7 10 ISENSE ROSC .. –50µA GN PART MARKING GND 8 9 BLANK VREF .. –10mA GN PACKAGE 1950E Operating Junction Temperature Range 16-LEAD NARROW PLASTIC SSOP T 1950I JMAX = 125°C, θJA = 110°C/W, LT1950EGN/LT1950IGN (Notes 2, 5) ... – 40°C to 125°C θJC (PIN 8) = 30°C/W Storage Temperature Range ..–65°C to 150°C Lead Temperature (Soldering, 10 sec).. 300°C Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. COMP = open, FB = 1.4V, ROSC = 249k, SYNC = 0V, SLOPE = open, VREF = 0.1
µ
F, SHDN = VIN, BLANK = 0V, ISENSE = 0V, VIN2 = 15V, GATE = 1nF, BOOST = open, VIN = 15V, VSEC = 0V, unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS PWM Controller
Operating Input Voltage IVREF = 0µA ● 3.0 25 V Minimum Start-Up Voltage IVREF = 0µA ● 2.6 3.0 V VIN Quiescent Current IVREF = 0µA, FB = 1V, ISENSE = 0.2V 2.3 3.0 mA VIN Shutdown Current SHDN = 0V 5 20 µA Shutdown Threshold 3V < VIN < 25V ● 1.261 1.32 1.379 V Shutdown Pin Current SHDN = 70mV Above Threshold –7 –10 –13 µA Shutdown Pin Current Hysteresis SHDN = 100mV Below Threshold 4 7 10 µA VIN2 Quiescent Current I(VREF) = 0µA, FB = 1V, ISENSE = 0.2V 1.7 2.5 mA VIN2 Shutdown Current SHDN = 0V, VIN2 = 2.7V (Boost Diode from VIN = 3V) 500 700 µA
VREF (External Output)
Output Voltage IVREF = 0µA ● 2.425 2.500 2.575 V Line Regulation IVREF = 0µA, 3V < VIN < 25V 1 5 mV Load Regulation 0µA < IVREF < 2.5mA 1 5 mV
Oscillator
Frequency: fOSC ROSC = 249k, FB = 1V ● 170 200 230 kHz Minimum Programmable fOSC ROSC = 499k 85 100 115 kHz Maximum Programmable fOSC ROSC = 90.9k 440 500 560 kHz SYNC Input Resistance 20 kΩ SYNC Switching Threshold 1.5 2.2 V SYNC Frequency/fOSC (ROSC = 249k, fOSC =200kHz), FB = 1V (Note 7) 1.25 1.5 fOSC Line Reg 3V < VIN < 25V 0.05 0.15 %/V 9.5V < VIN2 < 25V 0.05 0.25 %/V VROSC 1 V 1950fa 2
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
ORDER PART BOOST ... –0.3V to 35V TOP VIEW NUMBER COMP 1 16 V V SEC IN, VIN2, SHDN ... –0.3V to 25V FB 2 15 VIN FB, SYNC, VSEC ... –0.3V to 6V LT1950EGN R 3 14 OSC BOOST COMP, BLANK .. –0.3V to 3.5V SYNC 4 13 PGND LT1950IGN SLOPE .. –0.3V to 2.5V SLOPE 5 12 GATE V 6 11 I REF VIN2 SENSE ... –0.3V to 1V SHDN 7 10 ISENSE ROSC .. –50µA GN PART MARKING GND 8 9 BLANK VREF .. –10mA GN PACKAGE 1950E Operating Junction Temperature Range 16-LEAD NARROW PLASTIC SSOP T 1950I JMAX = 125°C, θJA = 110°C/W, LT1950EGN/LT1950IGN (Notes 2, 5) ... – 40°C to 125°C θJC (PIN 8) = 30°C/W Storage Temperature Range ..–65°C to 150°C Lead Temperature (Soldering, 10 sec).. 300°C Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. COMP = open, FB = 1.4V, ROSC = 249k, SYNC = 0V, SLOPE = open, VREF = 0.1
µ
F, SHDN = VIN, BLANK = 0V, ISENSE = 0V, VIN2 = 15V, GATE = 1nF, BOOST = open, VIN = 15V, VSEC = 0V, unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS PWM Controller
Operating Input Voltage IVREF = 0µA ● 3.0 25 V Minimum Start-Up Voltage IVREF = 0µA ● 2.6 3.0 V VIN Quiescent Current IVREF = 0µA, FB = 1V, ISENSE = 0.2V 2.3 3.0 mA VIN Shutdown Current SHDN = 0V 5 20 µA Shutdown Threshold 3V < VIN < 25V ● 1.261 1.32 1.379 V Shutdown Pin Current SHDN = 70mV Above Threshold –7 –10 –13 µA Shutdown Pin Current Hysteresis SHDN = 100mV Below Threshold 4 7 10 µA VIN2 Quiescent Current I(VREF) = 0µA, FB = 1V, ISENSE = 0.2V 1.7 2.5 mA VIN2 Shutdown Current SHDN = 0V, VIN2 = 2.7V (Boost Diode from VIN = 3V) 500 700 µA
VREF (External Output)
Output Voltage IVREF = 0µA ● 2.425 2.500 2.575 V Line Regulation IVREF = 0µA, 3V < VIN < 25V 1 5 mV Load Regulation 0µA < IVREF < 2.5mA 1 5 mV
Oscillator
Frequency: fOSC ROSC = 249k, FB = 1V ● 170 200 230 kHz Minimum Programmable fOSC ROSC = 499k 85 100 115 kHz Maximum Programmable fOSC ROSC = 90.9k 440 500 560 kHz SYNC Input Resistance 20 kΩ SYNC Switching Threshold 1.5 2.2 V SYNC Frequency/fOSC (ROSC = 249k, fOSC =200kHz), FB = 1V (Note 7) 1.25 1.5 fOSC Line Reg 3V < VIN < 25V 0.05 0.15 %/V 9.5V < VIN2 < 25V 0.05 0.25 %/V VROSC 1 V 1950fa 2
