Datasheet LT1946A (Linear Technology) - 2
| Hersteller | Linear Technology |
| Beschreibung | 2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start |
| Seiten / Seite | 12 / 2 — ABSOLUTE AXI U RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL … |
| Revision | S |
| Dateiformat / Größe | PDF / 326 Kb |
| Dokumentensprache | Englisch |
ABSOLUTE AXI U RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL CHARACTERISTICS The
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LT1946A
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
ORDER PART VIN Voltage .. 16V TOP VIEW NUMBER SW Voltage ..– 0.4V to 36V V 1 C 8 SS FB Voltage .. 2.5V FB 2 7 COMP LT1946AEMS8E SHDN 3 6 V Current into FB Pin ... ±1mA IN GND 4 5 SW SHDN Voltage .. 16V MS8E PACKAGE MS8E PART Maximum Junction Temperature .. 125°C 8-LEAD PLASTIC MSOP EXPOSED PAD IS GROUND MARKING Operating Temperature (MUST BE SOLDERED TO PCB) Range (Note 2) ... – 40°C to 85°C LTYZ TJMAX = 125°C, θJA = 40°C/W, Storage Temperature Range ... – 65°C to 150°C θJC = 10°C/W 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 = 3V, VSHDN = VIN unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage 2.45 2.6 V Maximum Operating Voltage 16 V Feedback Voltage 1.23 1.25 1.27 V ● 1.22 1.27 V FB Pin Bias Current VFB = 1.25V (Note 3) ● 20 120 nA Error Amp Transconductance ∆I = 2µA 40 µmhos Error Amp Voltage Gain 300 V/V Quiescent Current VSHDN = 2.5V, Not Switching 3.6 5 mA Quiescent Current in Shutdown VSHDN = 0V, VIN = 3V 0 1 µA Reference Line Regulation 2.6V ≤ VIN ≤ 16V 0.01 0.05 %/V Switching Frequency 2.4 2.7 3 MHz ● 2.3 3.1 MHz Switching Frequency in Foldback VFB = 0V 0.85 MHz Maximum Duty Cycle ● 73 80 % Switch Current Limit (Note 4) ● 1.5 2.1 3.1 A Switch VCESAT ISW = 1A 240 340 mV Switch Leakage Current VSW = 5V 0.01 1 µA Soft-Start Charging Current VSS = 0.5V 2.5 4 6 µA SHDN Input Voltage High 2.4 V SHDN Input Voltage Low 0.5 V SHDN Pin Bias Current VSHDN = 3V 16 32 µA VSHDN = 0V 0 0.1 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 LT1946AE is guaranteed to meet performance specifications
Note 3:
Current flows out of the FB pin. from 0°C to 70°C. Specifications over the –40°C to 85°C operating
Note 4:
Current limit guaranteed by design and/or correlation to static test. Current limit is independent of duty cycle and is guaranteed by design. sn1946a 1946afs 2
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
ORDER PART VIN Voltage .. 16V TOP VIEW NUMBER SW Voltage ..– 0.4V to 36V V 1 C 8 SS FB Voltage .. 2.5V FB 2 7 COMP LT1946AEMS8E SHDN 3 6 V Current into FB Pin ... ±1mA IN GND 4 5 SW SHDN Voltage .. 16V MS8E PACKAGE MS8E PART Maximum Junction Temperature .. 125°C 8-LEAD PLASTIC MSOP EXPOSED PAD IS GROUND MARKING Operating Temperature (MUST BE SOLDERED TO PCB) Range (Note 2) ... – 40°C to 85°C LTYZ TJMAX = 125°C, θJA = 40°C/W, Storage Temperature Range ... – 65°C to 150°C θJC = 10°C/W 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 = 3V, VSHDN = VIN unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage 2.45 2.6 V Maximum Operating Voltage 16 V Feedback Voltage 1.23 1.25 1.27 V ● 1.22 1.27 V FB Pin Bias Current VFB = 1.25V (Note 3) ● 20 120 nA Error Amp Transconductance ∆I = 2µA 40 µmhos Error Amp Voltage Gain 300 V/V Quiescent Current VSHDN = 2.5V, Not Switching 3.6 5 mA Quiescent Current in Shutdown VSHDN = 0V, VIN = 3V 0 1 µA Reference Line Regulation 2.6V ≤ VIN ≤ 16V 0.01 0.05 %/V Switching Frequency 2.4 2.7 3 MHz ● 2.3 3.1 MHz Switching Frequency in Foldback VFB = 0V 0.85 MHz Maximum Duty Cycle ● 73 80 % Switch Current Limit (Note 4) ● 1.5 2.1 3.1 A Switch VCESAT ISW = 1A 240 340 mV Switch Leakage Current VSW = 5V 0.01 1 µA Soft-Start Charging Current VSS = 0.5V 2.5 4 6 µA SHDN Input Voltage High 2.4 V SHDN Input Voltage Low 0.5 V SHDN Pin Bias Current VSHDN = 3V 16 32 µA VSHDN = 0V 0 0.1 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 LT1946AE is guaranteed to meet performance specifications
Note 3:
Current flows out of the FB pin. from 0°C to 70°C. Specifications over the –40°C to 85°C operating
Note 4:
Current limit guaranteed by design and/or correlation to static test. Current limit is independent of duty cycle and is guaranteed by design. sn1946a 1946afs 2