Datasheet LT1977 (Analog Devices) - 2
| 制造商 | Analog Devices |
| 描述 | High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100µA Quiescent Current |
| 页数 / 页 | 24 / 2 — ABSOLUTE AXI U. RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). Order … |
| 文件格式/大小 | PDF / 334 Kb |
| 文件语言 | 英语 |
ABSOLUTE AXI U. RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). Order Options. ELECTRICAL CHARACTERISTICS The
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LT1977
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
V TOP VIEW IN, SHDN, BIAS, SW, PG ... 60V ORDER PART BOOST Pin Above SW .. 35V NC 1 16 PG NUMBER BOOST Pin Voltage ... 68V SW 2 15 SHDN NC 3 14 SYNC LT1977EFE SYNC, CSS, PGFB, FB .. 6V V 4 13 PGFB LT1977IFE Operating JunctionTemperature Range IN 17 LT1977EFE (Note 2) .. – 40°C to 125°C NC 5 12 FB BOOST 6 11 V LT1977IFE (Note 2) ... – 40°C to 125°C C C 7 10 BIAS FE PART Storage Temperature Range ... – 65°C to 150°C T GND 8 9 CSS MARKING Lead Temperature (Soldering, 10 sec).. 300°C FE PACKAGE 16-LEAD PLASTIC TSSOP 1977EFE TJMAX = 125°C, θJA = 45°C/W, θJC(PAD) = 10°C/W 1977IFE EXPOSED PAD IS GND (PIN 17) MUST BE SOLDERED TO GND (PIN 8)
Order Options
Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ 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 TJ = 25
°
C. VIN = 12V, SHDN = 12V, BIAS = 5V, FB/PGFB = 1.25V, CSS/SYNC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VSHDN SHDN Threshold 1.15 1.3 1.45 V ISHDN SHDN Input Current SHDN = 12V ● 5 20 µA Minimum Input Voltage (Note 3) ● 2.4 3 V IVINS Supply Shutdown Current SHDN = 0V, BOOST = 0V, FB/PGFB = 0V 0.1 2 µA Supply Sleep Current (Note 4) BIAS = 0V, FB = 1.35V ● 170 250 µA FB = 1.35V ● 45 75 µA IVIN Supply Quiescent Current BIAS = 0V, FB = 1.15V 4.10 mA BIAS = 5V, FB = 1.15V 3.25 mA Minimum BIAS Voltage (Note 5) FB = 1.15V ● 2.7 3 V IBIASS BIAS Sleep Current (Note 4) ● 110 180 µA IBIAS BIAS Quiescent Current SYNC = 3.3V 700 900 µA Minimum Boost Voltage (Note 6) ISW = 1.5A 1.8 V Input Boost Current (Note 7) ISW = 1.5A 40 mA VREF Reference Voltage (VREF) 3.3V < VVIN < 60V ● 1.225 1.25 1.275 V IFB FB Input Bias Current 75 200 nA EA Voltage Gain (Note 8) 900 V/V EA Voltage gm dI(VC)= ±10µA 450 650 900 µMho EA Source Current FB = 1.15V 20 40 55 µA EA Sink Current FB = 1.35V 15 30 40 µA VC to SW gm 3 A/V VC High Clamp 2.1 2.2 2.4 V IPK SW Current Limit ● 1.5 2.4 3.5 A 1977fa 2
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
V TOP VIEW IN, SHDN, BIAS, SW, PG ... 60V ORDER PART BOOST Pin Above SW .. 35V NC 1 16 PG NUMBER BOOST Pin Voltage ... 68V SW 2 15 SHDN NC 3 14 SYNC LT1977EFE SYNC, CSS, PGFB, FB .. 6V V 4 13 PGFB LT1977IFE Operating JunctionTemperature Range IN 17 LT1977EFE (Note 2) .. – 40°C to 125°C NC 5 12 FB BOOST 6 11 V LT1977IFE (Note 2) ... – 40°C to 125°C C C 7 10 BIAS FE PART Storage Temperature Range ... – 65°C to 150°C T GND 8 9 CSS MARKING Lead Temperature (Soldering, 10 sec).. 300°C FE PACKAGE 16-LEAD PLASTIC TSSOP 1977EFE TJMAX = 125°C, θJA = 45°C/W, θJC(PAD) = 10°C/W 1977IFE EXPOSED PAD IS GND (PIN 17) MUST BE SOLDERED TO GND (PIN 8)
Order Options
Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ 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 TJ = 25
°
C. VIN = 12V, SHDN = 12V, BIAS = 5V, FB/PGFB = 1.25V, CSS/SYNC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VSHDN SHDN Threshold 1.15 1.3 1.45 V ISHDN SHDN Input Current SHDN = 12V ● 5 20 µA Minimum Input Voltage (Note 3) ● 2.4 3 V IVINS Supply Shutdown Current SHDN = 0V, BOOST = 0V, FB/PGFB = 0V 0.1 2 µA Supply Sleep Current (Note 4) BIAS = 0V, FB = 1.35V ● 170 250 µA FB = 1.35V ● 45 75 µA IVIN Supply Quiescent Current BIAS = 0V, FB = 1.15V 4.10 mA BIAS = 5V, FB = 1.15V 3.25 mA Minimum BIAS Voltage (Note 5) FB = 1.15V ● 2.7 3 V IBIASS BIAS Sleep Current (Note 4) ● 110 180 µA IBIAS BIAS Quiescent Current SYNC = 3.3V 700 900 µA Minimum Boost Voltage (Note 6) ISW = 1.5A 1.8 V Input Boost Current (Note 7) ISW = 1.5A 40 mA VREF Reference Voltage (VREF) 3.3V < VVIN < 60V ● 1.225 1.25 1.275 V IFB FB Input Bias Current 75 200 nA EA Voltage Gain (Note 8) 900 V/V EA Voltage gm dI(VC)= ±10µA 450 650 900 µMho EA Source Current FB = 1.15V 20 40 55 µA EA Sink Current FB = 1.35V 15 30 40 µA VC to SW gm 3 A/V VC High Clamp 2.1 2.2 2.4 V IPK SW Current Limit ● 1.5 2.4 3.5 A 1977fa 2