Datasheet LT3668 (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | 40V 400mA Step-Down Switching Regulator with Dual Fault Protected Tracking LDOs |
| Pages / Page | 28 / 9 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 386 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. LDOs:. Minimum Input Voltage. Load Regulation
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LT3668
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. LDOs: LDOs: LDOs: Minimum Input Voltage Load Regulation Output Noise Spectral Density
2.2 0 1µ ) 2.0 –1 Hz 1.8 –2 1.6 –3 1.4 100n –4 1.2 –5 1.0 0.8 –6 10n 0.6 –7 LOAD REGULATION (mV) ∆IOUT2/3 = 1mA TO 200mA COUT2/3 = 10µF MINIMUM INPUT VOLTAGE (V) 0.4 I –8 L = 200mA VOUT2/3 = 1.1V VIN2/3 = 6V 0.2 VOUT2/3 = 1.1V –9 VIN2/3 = 2.2V VADJ2/3 = 5V VIN1 = 5V VIN1 = 12V OUTPUT NOISE SPECTRAL DENSITY (V/√ IOUT2/3 = 200mA 0 –10 1n –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 10 100 1k 10k 100k 1M TEMPERATURE (°C) TEMPERATURE (°C) FREQUENCY (Hz) 3667 G37 3668 G38 3668 G39
LDOs: LDOs: LDOs: RMS Output Noise Small Signal Transfer Function Transient Response
80 20 45 COUT = 10µF IOUT2/3 = 200mA ) 70 fOUT2/3 = 10Hz TO 100kHz PHASE VIN2/3 = 6V 10 0 RMS V 60 VADJ2/3 = 5V OUT2/3 GAIN 50mV/DIV 0 –45 50 PHASE (°) I 40 –10 OUT2/3 = 20mA –90 GAIN (dB) I 30 OUT2/3 –20 –135 100mA/DIV 20 COUT = 10µF OUTPUT NOISE VOLTAGE (µV –30 fOUT2/3 = 10Hz TO 100kHz –180 10 V V IN2/3 = 6V OUT3/2 V 1mV/DIV ADJ2/3 = 5V 0 –40 –225 0.01 0.1 1 10 100 10 100 1k 10k 100k 1M 3668 G42 100µs/DIV LOAD CURRENT (mA) FREQUENCY (Hz) 3668 G40 3668 G41 VIN2/3 = 6V, VOUT2/3 = 5V IOUT3/2 = 20mA COUT2/3 = 10µF IOUT2/3 = 20mA TO 200mA
LDOs: External Current Limit, LDOs: External Current Limit, LDOs: External Current Limit, REN/ILIM = 1.54k REN/ILIM = 6.19k REN/ILIM = 31.6k
210 52.0 10.2 VOUT2/3 = 5V VOUT2/3 = 5V VOUT2/3 = 5V 205 51.5 VIN2/3 = 5.6V VIN2/3 = 5.6V 200 51.0 10.1 VIN2/3 = 10V VIN2/3 = 10V 195 50.5 VIN2/3 = 5.6V V 190 50.0 IN2/3 = 15V 10.0 VIN2/3 = 10V VIN2/3 = 15V 185 49.5 VIN2/3 = 15V CURRENT LIMIT (mA) CURRENT LIMIT (mA) CURRENT LIMIT (mA) 180 49.0 9.9 175 48.5 170 48.0 9.8 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3668 G43 3668 G44 3668 G45 3668fa For more information www.linear.com/LT3668 9 Document Outline Features Applications Description Typical Application Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. LDOs: LDOs: LDOs: Minimum Input Voltage Load Regulation Output Noise Spectral Density
2.2 0 1µ ) 2.0 –1 Hz 1.8 –2 1.6 –3 1.4 100n –4 1.2 –5 1.0 0.8 –6 10n 0.6 –7 LOAD REGULATION (mV) ∆IOUT2/3 = 1mA TO 200mA COUT2/3 = 10µF MINIMUM INPUT VOLTAGE (V) 0.4 I –8 L = 200mA VOUT2/3 = 1.1V VIN2/3 = 6V 0.2 VOUT2/3 = 1.1V –9 VIN2/3 = 2.2V VADJ2/3 = 5V VIN1 = 5V VIN1 = 12V OUTPUT NOISE SPECTRAL DENSITY (V/√ IOUT2/3 = 200mA 0 –10 1n –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 10 100 1k 10k 100k 1M TEMPERATURE (°C) TEMPERATURE (°C) FREQUENCY (Hz) 3667 G37 3668 G38 3668 G39
LDOs: LDOs: LDOs: RMS Output Noise Small Signal Transfer Function Transient Response
80 20 45 COUT = 10µF IOUT2/3 = 200mA ) 70 fOUT2/3 = 10Hz TO 100kHz PHASE VIN2/3 = 6V 10 0 RMS V 60 VADJ2/3 = 5V OUT2/3 GAIN 50mV/DIV 0 –45 50 PHASE (°) I 40 –10 OUT2/3 = 20mA –90 GAIN (dB) I 30 OUT2/3 –20 –135 100mA/DIV 20 COUT = 10µF OUTPUT NOISE VOLTAGE (µV –30 fOUT2/3 = 10Hz TO 100kHz –180 10 V V IN2/3 = 6V OUT3/2 V 1mV/DIV ADJ2/3 = 5V 0 –40 –225 0.01 0.1 1 10 100 10 100 1k 10k 100k 1M 3668 G42 100µs/DIV LOAD CURRENT (mA) FREQUENCY (Hz) 3668 G40 3668 G41 VIN2/3 = 6V, VOUT2/3 = 5V IOUT3/2 = 20mA COUT2/3 = 10µF IOUT2/3 = 20mA TO 200mA
LDOs: External Current Limit, LDOs: External Current Limit, LDOs: External Current Limit, REN/ILIM = 1.54k REN/ILIM = 6.19k REN/ILIM = 31.6k
210 52.0 10.2 VOUT2/3 = 5V VOUT2/3 = 5V VOUT2/3 = 5V 205 51.5 VIN2/3 = 5.6V VIN2/3 = 5.6V 200 51.0 10.1 VIN2/3 = 10V VIN2/3 = 10V 195 50.5 VIN2/3 = 5.6V V 190 50.0 IN2/3 = 15V 10.0 VIN2/3 = 10V VIN2/3 = 15V 185 49.5 VIN2/3 = 15V CURRENT LIMIT (mA) CURRENT LIMIT (mA) CURRENT LIMIT (mA) 180 49.0 9.9 175 48.5 170 48.0 9.8 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3668 G43 3668 G44 3668 G45 3668fa For more information www.linear.com/LT3668 9 Document Outline Features Applications Description Typical Application Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Related Parts
