Datasheet LT1766, LT1766-5 (Analog Devices) - 7
| Fabricante | Analog Devices |
| Descripción | 5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator |
| Páginas / Página | 30 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Minimum Input Voltage with 5V. … |
| Formato / tamaño de archivo | PDF / 291 Kb |
| Idioma del documento | Inglés |
TYPICAL PERFORMANCE CHARACTERISTICS. Minimum Input Voltage with 5V. Switching Frequency. Output. BOOST Pin Current
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LT1766/LT1766-5
TYPICAL PERFORMANCE CHARACTERISTICS Minimum Input Voltage with 5V Switching Frequency Output BOOST Pin Current
230 7.5 45 TA = 25°C TA = 25°C 40 220 7.0 35 210 30 6.5 MINIMUM INPUT 25 200 VOLTAGE TO START 20 6.0 FREQUENCY (kHz) 190 INPUT VOLTAGE (V) 15 BOOST PIN CURRENT (mA) 5.5 MINIMUM INPUT 10 180 VOLTAGE TO RUN 5 170 5.0 0 –50 –25 0 25 50 75 100 125 150 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 0.5 1 1.5 JUNCTION TEMPERATURE (°C) LOAD CURRENT (A) SWITCH CURRENT (A) 1766 G10 1766 G11 1766 G12
Switch Minimum On-Time VC Pin Shutdown Threshold Switch Voltage Drop vs Temperature
2.1 450 600 1.9 400 TJ = 150°C 500 350 1.7 300 TJ = 125°C 400 TAGE (V) 1.5 TAGE (mV) 250 TJ = 25°C 300 1.3 200 150 200 1.1 T THRESHOLD VOL SWITCH VOL J = –40°C 100 0.9 SWITCH MINIMUM ON TIME (ns) 100 50 0.7 0 0 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 –50 –25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE (°C) SWITCH CURRENT (A) JUNCTION TEMPERATURE (°C) 1766 G13 1766 G14 1766 G15
PIN FUNCTIONS GND (Pins 1, 8, 9, 16, 17):
The GND pin connections act copper ground plane underneath the device. (See Applica- as the reference for the regulated output, so load regula- tions Information—Layout Considerations.) tion will suffer if the ground end of the load is not at the
SW (Pin 2):
The switch pin is the emitter of the on-chip same voltage as the GND pins of the IC. This condition will power NPN switch. This pin is driven up to the input pin occur when load current or other currents fl ow through voltage during switch on-time. Inductor current drives the metal paths between the GND pins and the load ground. switch pin negative during switch off-time. Negative volt- Keep the paths between the GND pins and the load ground age is clamped with the external catch diode. Maximum short and use a ground plane when possible. The GND negative switch voltage allowed is – 0.8V. pin also acts as a heat sink and should be soldered to a large copper plane to reduce thermal resistance. For the
NC (Pins 3, 5, 7, 13):
No Connection. FE package, the exposed pad should be soldered to the 1766fc 7
TYPICAL PERFORMANCE CHARACTERISTICS Minimum Input Voltage with 5V Switching Frequency Output BOOST Pin Current
230 7.5 45 TA = 25°C TA = 25°C 40 220 7.0 35 210 30 6.5 MINIMUM INPUT 25 200 VOLTAGE TO START 20 6.0 FREQUENCY (kHz) 190 INPUT VOLTAGE (V) 15 BOOST PIN CURRENT (mA) 5.5 MINIMUM INPUT 10 180 VOLTAGE TO RUN 5 170 5.0 0 –50 –25 0 25 50 75 100 125 150 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 0.5 1 1.5 JUNCTION TEMPERATURE (°C) LOAD CURRENT (A) SWITCH CURRENT (A) 1766 G10 1766 G11 1766 G12
Switch Minimum On-Time VC Pin Shutdown Threshold Switch Voltage Drop vs Temperature
2.1 450 600 1.9 400 TJ = 150°C 500 350 1.7 300 TJ = 125°C 400 TAGE (V) 1.5 TAGE (mV) 250 TJ = 25°C 300 1.3 200 150 200 1.1 T THRESHOLD VOL SWITCH VOL J = –40°C 100 0.9 SWITCH MINIMUM ON TIME (ns) 100 50 0.7 0 0 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 –50 –25 0 25 50 75 100 125 150 JUNCTION TEMPERATURE (°C) SWITCH CURRENT (A) JUNCTION TEMPERATURE (°C) 1766 G13 1766 G14 1766 G15
PIN FUNCTIONS GND (Pins 1, 8, 9, 16, 17):
The GND pin connections act copper ground plane underneath the device. (See Applica- as the reference for the regulated output, so load regula- tions Information—Layout Considerations.) tion will suffer if the ground end of the load is not at the
SW (Pin 2):
The switch pin is the emitter of the on-chip same voltage as the GND pins of the IC. This condition will power NPN switch. This pin is driven up to the input pin occur when load current or other currents fl ow through voltage during switch on-time. Inductor current drives the metal paths between the GND pins and the load ground. switch pin negative during switch off-time. Negative volt- Keep the paths between the GND pins and the load ground age is clamped with the external catch diode. Maximum short and use a ground plane when possible. The GND negative switch voltage allowed is – 0.8V. pin also acts as a heat sink and should be soldered to a large copper plane to reduce thermal resistance. For the
NC (Pins 3, 5, 7, 13):
No Connection. FE package, the exposed pad should be soldered to the 1766fc 7