Datasheet LTC3638 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | High Efficiency, 140V 250mA Step-Down Regulator |
| Pages / Page | 26 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Quiescent Supply Current. Switch Pin … |
| File Format / Size | PDF / 624 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Quiescent Supply Current. Switch Pin Current. vs Input Voltage. vs Temperature
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LTC3638
TYPICAL PERFORMANCE CHARACTERISTICS Quiescent Supply Current Quiescent Supply Current Switch Pin Current vs Input Voltage vs Temperature vs Temperature
15 35 15 VIN = 140V VIN = 140V SLEEP MODE SLEEP 30 10 SW = 0.8V 25 CURRENT INTO SW 10 5 20 SLEEP 0 15 SW = 0V CURRENT OUT OF SW 5 –5 SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 10 V IN V IN SWITCH PIN CURRENT (µA) SHUTDOWN 5 –10 SHUTDOWN 0 0 –15 0 30 60 90 120 150 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 VIN VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3638 G10 3638 G12 3638 G11
Switch On-Resistance Switch On-Resistance vs Input Voltage vs Temperature Load Step Transient Response
3.0 4 ISW = 250mA OUTPUT VOLTAGE 50mV/DIV 2.5 3 LOAD CURRENT 100mA/DIV 2.0 2 V 3638 G15 IN = 48V 200µs/DIV VOUT = 3.3V 1.5 1mA TO 250mA LOAD STEP 1 SWITCH ON-RESISTANCE (Ω) SWITCH ON-RESISTANCE (Ω) FIGURE 15 CIRCUIT 1.0 0 30 60 90 120 150 0–55 –25 5 35 65 95 125 155 VIN VOLTAGE (V) TEMPERATURE (°C) 3638 G13 3638 G14
Operating Waveforms, VIN = 48V Operating Waveforms, VIN = 140V Short-Circuit and Recovery
OUTPUT OUTPUT VOLTAGE VOLTAGE 50mV/DIV 50mV/DIV OUTPUT VOLTAGE SWITCH SWITCH 1V/DIV VOLTAGE VOLTAGE 20V/DIV 50V/DIV INDUCTOR INDUCTOR INDUCTOR CURRENT CURRENT CURRENT 500mA/DIV 500mA/DIV 500mA/DIV V 3638 G16 3638 G17 3638 G18 IN = 48V 10µs/DIV VIN = 140V 10µs/DIV 500µs/DIV VOUT = 3.3V VOUT = 3.3V FIGURE 15 CIRCUIT IOUT = 250mA IOUT = 250mA FIGURE 15 CIRCUIT FIGURE 15 CIRCUIT 3638fa For more information www.linear.com/LTC3638 5 Document Outline Features Applications Description 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
TYPICAL PERFORMANCE CHARACTERISTICS Quiescent Supply Current Quiescent Supply Current Switch Pin Current vs Input Voltage vs Temperature vs Temperature
15 35 15 VIN = 140V VIN = 140V SLEEP MODE SLEEP 30 10 SW = 0.8V 25 CURRENT INTO SW 10 5 20 SLEEP 0 15 SW = 0V CURRENT OUT OF SW 5 –5 SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 10 V IN V IN SWITCH PIN CURRENT (µA) SHUTDOWN 5 –10 SHUTDOWN 0 0 –15 0 30 60 90 120 150 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 VIN VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3638 G10 3638 G12 3638 G11
Switch On-Resistance Switch On-Resistance vs Input Voltage vs Temperature Load Step Transient Response
3.0 4 ISW = 250mA OUTPUT VOLTAGE 50mV/DIV 2.5 3 LOAD CURRENT 100mA/DIV 2.0 2 V 3638 G15 IN = 48V 200µs/DIV VOUT = 3.3V 1.5 1mA TO 250mA LOAD STEP 1 SWITCH ON-RESISTANCE (Ω) SWITCH ON-RESISTANCE (Ω) FIGURE 15 CIRCUIT 1.0 0 30 60 90 120 150 0–55 –25 5 35 65 95 125 155 VIN VOLTAGE (V) TEMPERATURE (°C) 3638 G13 3638 G14
Operating Waveforms, VIN = 48V Operating Waveforms, VIN = 140V Short-Circuit and Recovery
OUTPUT OUTPUT VOLTAGE VOLTAGE 50mV/DIV 50mV/DIV OUTPUT VOLTAGE SWITCH SWITCH 1V/DIV VOLTAGE VOLTAGE 20V/DIV 50V/DIV INDUCTOR INDUCTOR INDUCTOR CURRENT CURRENT CURRENT 500mA/DIV 500mA/DIV 500mA/DIV V 3638 G16 3638 G17 3638 G18 IN = 48V 10µs/DIV VIN = 140V 10µs/DIV 500µs/DIV VOUT = 3.3V VOUT = 3.3V FIGURE 15 CIRCUIT IOUT = 250mA IOUT = 250mA FIGURE 15 CIRCUIT FIGURE 15 CIRCUIT 3638fa For more information www.linear.com/LTC3638 5 Document Outline Features Applications Description 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
