Datasheet LT3667 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | 40V 400mA Step-Down Switching Regulator with Dual Fault Protected LDOs |
| Pages / Page | 34 / 4 — ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply … |
| File Format / Size | PDF / 446 Kb |
| Document Language | English |
ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply over the full operating
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LT3667
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN1 = 12V unless otherwise noted. (Note 4) PARAMETER CONDITIONS MIN TYP MAX UNITS Switching Regulator
Switching Frequency RT = 37.4k l 1.8 2.0 2.1 MHz RT = 102k l 0.8 0.94 1.1 MHz RT = 487k l 220 243 275 kHz Minimum Switch Off-Time l 120 170 ns Switch Current Limit (Note 7) 5% Duty Cycle, VIN = 5V, VFB1 = 0V l 600 750 950 mA 90% Duty Cycle, VIN = 5V, VFB1 = 0V l 450 550 750 mA Switch VCESAT ISW = 200mA 300 mV DA Pin Current to Stop Switching l 420 500 650 mA Switch Leakage Current VSW = 0V 0.05 2 µA Boost Schottky Diode Forward Voltage IBOOSTDIODE = 50mA, VIN = NC, VBOOST = 0V 900 mV Boost Schottky Diode Reverse Leakage VREVERSE = 12V, VIN = NC 0.04 4 µA Minimum Boost Voltage (Note 8) l 1.7 2.5 V BOOST Pin Current ISW = 200mA, VBOOST = 15V 10 16 mA Feedback Voltage (FB1) 1.188 1.2 1.212 V l 1.176 1.2 1.224 mV FB1 Pin Bias Current Pin Voltage = 1.2V l 0.1 20 nA Reference Voltage Line Regulation 4.2V < VIN1 < 40V 0.001 0.005 %/V SYNC High Level Input Voltage l 1.2 V SYNC Low Level Input Voltage l 0.5 V SYNC Input Frequency 0.3 2.2 MHz
Each LDO Regulator
Minimum Input Voltage ILOAD = 200mA l 1.6 2.2 V Feedback Voltage (FB2/FB3) VIN = 2.2V, ILOAD = 1mA 792 800 808 mV 2.2V < VIN < 15V, 1mA < ILOAD < 200mA l 784 816 mV Load Regulation (Note 12) VIN = 2.2V, ILOAD = 1mA to 200mA l 0.2 5 mV Reference Voltage Line Regulation (Note 12) 2.2V < VIN2,3 < 45V 0.005 0.01 %/V Dropout Voltage (Notes 9, 10), VIN = VOUT(NOMINAL) ILOAD = 1mA 70 165 mV ILOAD = 1mA l 210 mV ILOAD = 50mA 230 300 mV ILOAD = 50mA l 400 mV ILOAD = 100mA 280 400 mV ILOAD = 100mA l 450 mV ILOAD = 200mA 340 650 mV ILOAD = 200mA l 750 mV GND Pin Current, VIN = VOUT(NOMINAL) + 0.6V ILOAD = 0mA l 40 90 µA (Notes 10, 11) ILOAD = 50mA l 1 2 mA ILOAD = 200mA l 5 10 mA Quiescent Current IIN2 with LDO2 Disabled VIN1 = 0V, VIN2 = 12V, VEN2/ILIM2 = 2V 13 20 µA Quiescent Current IIN3 with LDO3 Disabled (QFN) VIN1 = 16V, VIN3 = 12V, VEN3/ILIM3 = 2V 0.2 1 µA Quiescent Current IIN3/BD with LDO3 Disabled (MSOP) VIN1 = 16V, VIN3/BD = 12V, VEN3/ILIM3 = 2V 1.2 2 µA FB2 Pin Bias Current (Note 12) VIN2 = 12V l –3 ±40 nA FB3 Pin Bias Current (Note 12) VIN3 = 12V l –3 ±40 nA Ripple Rejection (Note 12) VIN – VOUT = 2V (Avg), VRIPPLE = 0.5VP-P, 60 85 dB fRIPPLE = 120Hz, ILOAD =200mA 3667fb 4 For more information www.linear.com/LT3667 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN1 = 12V unless otherwise noted. (Note 4) PARAMETER CONDITIONS MIN TYP MAX UNITS Switching Regulator
Switching Frequency RT = 37.4k l 1.8 2.0 2.1 MHz RT = 102k l 0.8 0.94 1.1 MHz RT = 487k l 220 243 275 kHz Minimum Switch Off-Time l 120 170 ns Switch Current Limit (Note 7) 5% Duty Cycle, VIN = 5V, VFB1 = 0V l 600 750 950 mA 90% Duty Cycle, VIN = 5V, VFB1 = 0V l 450 550 750 mA Switch VCESAT ISW = 200mA 300 mV DA Pin Current to Stop Switching l 420 500 650 mA Switch Leakage Current VSW = 0V 0.05 2 µA Boost Schottky Diode Forward Voltage IBOOSTDIODE = 50mA, VIN = NC, VBOOST = 0V 900 mV Boost Schottky Diode Reverse Leakage VREVERSE = 12V, VIN = NC 0.04 4 µA Minimum Boost Voltage (Note 8) l 1.7 2.5 V BOOST Pin Current ISW = 200mA, VBOOST = 15V 10 16 mA Feedback Voltage (FB1) 1.188 1.2 1.212 V l 1.176 1.2 1.224 mV FB1 Pin Bias Current Pin Voltage = 1.2V l 0.1 20 nA Reference Voltage Line Regulation 4.2V < VIN1 < 40V 0.001 0.005 %/V SYNC High Level Input Voltage l 1.2 V SYNC Low Level Input Voltage l 0.5 V SYNC Input Frequency 0.3 2.2 MHz
Each LDO Regulator
Minimum Input Voltage ILOAD = 200mA l 1.6 2.2 V Feedback Voltage (FB2/FB3) VIN = 2.2V, ILOAD = 1mA 792 800 808 mV 2.2V < VIN < 15V, 1mA < ILOAD < 200mA l 784 816 mV Load Regulation (Note 12) VIN = 2.2V, ILOAD = 1mA to 200mA l 0.2 5 mV Reference Voltage Line Regulation (Note 12) 2.2V < VIN2,3 < 45V 0.005 0.01 %/V Dropout Voltage (Notes 9, 10), VIN = VOUT(NOMINAL) ILOAD = 1mA 70 165 mV ILOAD = 1mA l 210 mV ILOAD = 50mA 230 300 mV ILOAD = 50mA l 400 mV ILOAD = 100mA 280 400 mV ILOAD = 100mA l 450 mV ILOAD = 200mA 340 650 mV ILOAD = 200mA l 750 mV GND Pin Current, VIN = VOUT(NOMINAL) + 0.6V ILOAD = 0mA l 40 90 µA (Notes 10, 11) ILOAD = 50mA l 1 2 mA ILOAD = 200mA l 5 10 mA Quiescent Current IIN2 with LDO2 Disabled VIN1 = 0V, VIN2 = 12V, VEN2/ILIM2 = 2V 13 20 µA Quiescent Current IIN3 with LDO3 Disabled (QFN) VIN1 = 16V, VIN3 = 12V, VEN3/ILIM3 = 2V 0.2 1 µA Quiescent Current IIN3/BD with LDO3 Disabled (MSOP) VIN1 = 16V, VIN3/BD = 12V, VEN3/ILIM3 = 2V 1.2 2 µA FB2 Pin Bias Current (Note 12) VIN2 = 12V l –3 ±40 nA FB3 Pin Bias Current (Note 12) VIN3 = 12V l –3 ±40 nA Ripple Rejection (Note 12) VIN – VOUT = 2V (Avg), VRIPPLE = 0.5VP-P, 60 85 dB fRIPPLE = 120Hz, ILOAD =200mA 3667fb 4 For more information www.linear.com/LT3667 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application Related Parts
