Datasheet LT1944-1 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | Dual Micropower Step-Up DC/DC Converter |
| Pages / Page | 8 / 2 — ABSOLUTE AXI U. RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL … |
| File Format / Size | PDF / 151 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
LT1944-1
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
ORDER PART V TOP VIEW IN, SHDN1, SHDN2 Voltage ... 15V NUMBER FB1 1 10 SW1 SW1, SW2 Voltage .. 36V SHDN1 2 9 PGND GND 3 8 VIN LT1944-1EMS FB1, FB2 Voltage ...VIN SHDN2 4 7 PGND Current into FB1, FB2 Pins ... 1mA FB2 5 6 SW2 Junction Temperature ... 125°C MS10 PACKAGE MS10 PART 10-LEAD PLASTIC MSOP Operating Temperature Range (Note 2) .. – 40°C to 85°C MARKING Storage Temperature Range ... – 65°C to 150°C TJMAX = 125°C, θJA = 160°C/W LTTU 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. VIN = 1.2V, VSHDN = 1.2V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage 1.2 V Quiescent Current, Each Switcher Not Switching 20 30 µA VSHDN = 0V 1 µA FB Comparator Trip Point ● 1.205 1.23 1.255 V FB Comparator Hysteresis 8 mV FB Voltage Line Regulation 1.2V < VIN < 12V 0.05 0.1 %/V FB Pin Bias Current (Note 3) VFB = 1.23V ● 30 80 nA Switch Off Time, Switcher 1 (Note 4) VFB > 1V 400 ns VFB < 0.6V 1.5 µs Switch Off Time, Switcher 2 (Note 4) VFB > 1V 1.5 µs VFB < 0.6V 1.5 µs Switch VCESAT ISW = 70mA 85 120 mV Switch Current Limit, Switcher 1 65 100 125 mA Switch Current Limit, Switcher 2 130 175 225 mA SHDN Pin Current VSHDN = 1.2V 2 3 µA VSHDN = 5V 8 12 µA SHDN Input Voltage High 0.9 V SHDN Input Voltage Low 0.25 V Switch Leakage Current Switch Off, VSW = 5V 0.01 5 µA
Note 1:
Absolute Maximum Ratings are those values beyond which the life temperature range are assured by design, characterization and correlation of a device may be impaired. with statistical process controls.
Note 2:
The LT1944-1E is guaranteed to meet performance specifications
Note 3:
Bias current flows into the FB pin. from 0°C to 70°C. Specifications over the – 40°C to 85°C operating
Note 4:
See Figure 1 for Switcher 1 and Switcher 2 locations. 2
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
ORDER PART V TOP VIEW IN, SHDN1, SHDN2 Voltage ... 15V NUMBER FB1 1 10 SW1 SW1, SW2 Voltage .. 36V SHDN1 2 9 PGND GND 3 8 VIN LT1944-1EMS FB1, FB2 Voltage ...VIN SHDN2 4 7 PGND Current into FB1, FB2 Pins ... 1mA FB2 5 6 SW2 Junction Temperature ... 125°C MS10 PACKAGE MS10 PART 10-LEAD PLASTIC MSOP Operating Temperature Range (Note 2) .. – 40°C to 85°C MARKING Storage Temperature Range ... – 65°C to 150°C TJMAX = 125°C, θJA = 160°C/W LTTU 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. VIN = 1.2V, VSHDN = 1.2V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage 1.2 V Quiescent Current, Each Switcher Not Switching 20 30 µA VSHDN = 0V 1 µA FB Comparator Trip Point ● 1.205 1.23 1.255 V FB Comparator Hysteresis 8 mV FB Voltage Line Regulation 1.2V < VIN < 12V 0.05 0.1 %/V FB Pin Bias Current (Note 3) VFB = 1.23V ● 30 80 nA Switch Off Time, Switcher 1 (Note 4) VFB > 1V 400 ns VFB < 0.6V 1.5 µs Switch Off Time, Switcher 2 (Note 4) VFB > 1V 1.5 µs VFB < 0.6V 1.5 µs Switch VCESAT ISW = 70mA 85 120 mV Switch Current Limit, Switcher 1 65 100 125 mA Switch Current Limit, Switcher 2 130 175 225 mA SHDN Pin Current VSHDN = 1.2V 2 3 µA VSHDN = 5V 8 12 µA SHDN Input Voltage High 0.9 V SHDN Input Voltage Low 0.25 V Switch Leakage Current Switch Off, VSW = 5V 0.01 5 µA
Note 1:
Absolute Maximum Ratings are those values beyond which the life temperature range are assured by design, characterization and correlation of a device may be impaired. with statistical process controls.
Note 2:
The LT1944-1E is guaranteed to meet performance specifications
Note 3:
Bias current flows into the FB pin. from 0°C to 70°C. Specifications over the – 40°C to 85°C operating
Note 4:
See Figure 1 for Switcher 1 and Switcher 2 locations. 2
