Datasheet LT1938 (Analog Devices) - 2
| 制造商 | Analog Devices |
| 描述 | 25V, 2.2A, 2.8MHz Step-Down Switching Regulator |
| 页数 / 页 | 24 / 2 — AbSOLUTE MAxIMUM RATINgS. PIN CONFIgURATION. (Note 1). ORDER INFORMATION. … |
| 文件格式/大小 | PDF / 271 Kb |
| 文件语言 | 英语 |
AbSOLUTE MAxIMUM RATINgS. PIN CONFIgURATION. (Note 1). ORDER INFORMATION. LEAD FREE FINISH. TAPE AND REEL. PART MARKING*
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LT1938
AbSOLUTE MAxIMUM RATINgS PIN CONFIgURATION (Note 1)
VIN, RUN/SS Voltage ...25V TOP VIEW BOOST Pin Voltage ...50V BOOST Pin Above SW Pin ...25V BD 1 10 RT BOOST 2 9 V FB, RT, V C C Voltage ...5V SW 3 11 8 FB BIAS, PG, BD Voltage ..25V VIN 4 7 BIAS Operating Junction Temperature Range (Note 2) RUN/SS 5 6 PG LT1938E ... –40°C to 125°C DD PACKAGE LT1938I .. –40°C to 125°C 10-LEAD (3mm × 3mm) PLASTIC DFN Storage Temperature Range ... –65°C to 150°C TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1938EDD#PBF LT1938EDD#TRPBF LDFT 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C LT1938IDD#PBF LT1938IDD#TRPBF LDFT 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL ChARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUN/SS = 10V, VBOOST = 15V, VBIAS = 3.3V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage ● 3 3.6 V Quiescent Current from VIN VRUN/SS = 0.2V 0.01 0.5 µA VBIAS = 3V, Not Switching ● 0.4 0.8 mA VBIAS = 0, Not Switching 1.2 2.0 mA Quiescent Current from BIAS VRUN/SS = 0.2V 0.01 0.5 µA VBIAS = 3V, Not Switching ● 0.85 1.5 mA VBIAS = 0, Not Switching 0 0.1 mA Minimum Bias Voltage 2.7 3 V Feedback Voltage 1.25 1.265 1.28 V ● 1.24 1.265 1.29 V FB Pin Bias Current (Note 3) ● 30 100 nA FB Voltage Line Regulation 4V < VIN < 25V 0.002 0.02 %/V 1938fa 2 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL ChARACTERISTICS TYPICAL PERFORMANCE ChARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS
AbSOLUTE MAxIMUM RATINgS PIN CONFIgURATION (Note 1)
VIN, RUN/SS Voltage ...25V TOP VIEW BOOST Pin Voltage ...50V BOOST Pin Above SW Pin ...25V BD 1 10 RT BOOST 2 9 V FB, RT, V C C Voltage ...5V SW 3 11 8 FB BIAS, PG, BD Voltage ..25V VIN 4 7 BIAS Operating Junction Temperature Range (Note 2) RUN/SS 5 6 PG LT1938E ... –40°C to 125°C DD PACKAGE LT1938I .. –40°C to 125°C 10-LEAD (3mm × 3mm) PLASTIC DFN Storage Temperature Range ... –65°C to 150°C TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1938EDD#PBF LT1938EDD#TRPBF LDFT 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C LT1938IDD#PBF LT1938IDD#TRPBF LDFT 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL ChARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUN/SS = 10V, VBOOST = 15V, VBIAS = 3.3V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage ● 3 3.6 V Quiescent Current from VIN VRUN/SS = 0.2V 0.01 0.5 µA VBIAS = 3V, Not Switching ● 0.4 0.8 mA VBIAS = 0, Not Switching 1.2 2.0 mA Quiescent Current from BIAS VRUN/SS = 0.2V 0.01 0.5 µA VBIAS = 3V, Not Switching ● 0.85 1.5 mA VBIAS = 0, Not Switching 0 0.1 mA Minimum Bias Voltage 2.7 3 V Feedback Voltage 1.25 1.265 1.28 V ● 1.24 1.265 1.29 V FB Pin Bias Current (Note 3) ● 30 100 nA FB Voltage Line Regulation 4V < VIN < 25V 0.002 0.02 %/V 1938fa 2 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL ChARACTERISTICS TYPICAL PERFORMANCE ChARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS