Datasheet LT3688 (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | Dual 800mA Step-Down Switching Regulator with Power-On Reset and Watchdog Timer |
| 页数 / 页 | 28 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. TA = 25°C unless otherwise noted. … |
| 文件格式/大小 | PDF / 430 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. TA = 25°C unless otherwise noted. Switching Frequency. Switching Frequency vs RT
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LT3688
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Switching Frequency Switching Frequency vs RT vs Temperature Minimum Switch On-Time
2.5 1.2 200 R I T = 49.9k SW = 700mA 1.0 2.0 150 0.8 1.5 0.6 100 1.0 0.4 MINIMUM ON TIME (ns) 50 SWITCHING FREQUENCY (MHz) 0.5 SWITCHING FREQUENCY (MHz) 0.2 0 0.0 0 0 50 100 150 200 –50 –25 0 25 50 75 100 125 150 –50 –20 0 25 50 75 100 125 150 RT (kΩ) TEMPERATURE (°C) TEMPERATURE (°C) 3688 G13 3688 G14 3688 G16
EN/UVLO Pin Current EN/UVLO Pin Threshold Boost Diode Forward Voltage
25 1.50 900 THRESHOLD FALLING 800 20 1.40 700 600 15 1.30 TAGE (mV) 500 400 10 1.20 ARD VOL PIN CURRENT (μA) W 300 FOR 5 EN/UVLO PIN THRESHOLD (V) 1.10 200 100 0 1.00 0 0 5 10 15 20 25 30 35 40 –50 –25 0 25 50 75 100 125 150 0 10 20 30 40 50 PIN VOLTAGE (V) TEMPERATURE (°C) CURRENT (mA) 3688 G17 3688 G18 3688 G19
Switching Waveforms, Switching Waveforms, Transition from Burst Mode Switching Waveforms, Full Burst Mode Operation to Full Frequency Frequency Continuous Operation
I I L L IL 0.2A/DIV 0.2A/DIV 0.2A/DIV VSW VSW VSW 5V/DIV 5V/DIV 5V/DIV V V OUT OUT VOUT 10mV/DIV 10mV/DIV 10mV/DIV 5μs/DIV 3688 G20 5μs/DIV 3688 G21 5μs/DIV 3688 G22 V V IN = 12V; FRONT PAGE APPLICATION IN = 12V; FRONT PAGE APPLICATION VIN = 12V; FRONT PAGE APPLICATION I I LOAD = 7mA LOAD = 40mA ILOAD = 160mA 3688f 6
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Switching Frequency Switching Frequency vs RT vs Temperature Minimum Switch On-Time
2.5 1.2 200 R I T = 49.9k SW = 700mA 1.0 2.0 150 0.8 1.5 0.6 100 1.0 0.4 MINIMUM ON TIME (ns) 50 SWITCHING FREQUENCY (MHz) 0.5 SWITCHING FREQUENCY (MHz) 0.2 0 0.0 0 0 50 100 150 200 –50 –25 0 25 50 75 100 125 150 –50 –20 0 25 50 75 100 125 150 RT (kΩ) TEMPERATURE (°C) TEMPERATURE (°C) 3688 G13 3688 G14 3688 G16
EN/UVLO Pin Current EN/UVLO Pin Threshold Boost Diode Forward Voltage
25 1.50 900 THRESHOLD FALLING 800 20 1.40 700 600 15 1.30 TAGE (mV) 500 400 10 1.20 ARD VOL PIN CURRENT (μA) W 300 FOR 5 EN/UVLO PIN THRESHOLD (V) 1.10 200 100 0 1.00 0 0 5 10 15 20 25 30 35 40 –50 –25 0 25 50 75 100 125 150 0 10 20 30 40 50 PIN VOLTAGE (V) TEMPERATURE (°C) CURRENT (mA) 3688 G17 3688 G18 3688 G19
Switching Waveforms, Switching Waveforms, Transition from Burst Mode Switching Waveforms, Full Burst Mode Operation to Full Frequency Frequency Continuous Operation
I I L L IL 0.2A/DIV 0.2A/DIV 0.2A/DIV VSW VSW VSW 5V/DIV 5V/DIV 5V/DIV V V OUT OUT VOUT 10mV/DIV 10mV/DIV 10mV/DIV 5μs/DIV 3688 G20 5μs/DIV 3688 G21 5μs/DIV 3688 G22 V V IN = 12V; FRONT PAGE APPLICATION IN = 12V; FRONT PAGE APPLICATION VIN = 12V; FRONT PAGE APPLICATION I I LOAD = 7mA LOAD = 40mA ILOAD = 160mA 3688f 6