Datasheet LT8709 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Negative Input Synchronous Multi-Topology DC/DC Controller |
| Pages / Page | 48 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, all voltages relative to … |
| File Format / Size | PDF / 802 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, all voltages relative to –VIN. unless otherwise noted
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LT8709
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, all voltages relative to –VIN unless otherwise noted. DCM Comparator Threshold vs PG Threshold vs Temperature MODE Pin Threshold vs Temperature (Rising and Falling) Temperature (Rising and Falling)
6 –280 80 80 1.24 NEGA 1.23 5 –290 TIVE FBY CURRENT OUT OF PIN (µA) 78 78 1.22 POSITIVE RISING MODE = 0V, FCM RISING 1.21 4 –300 ISP-ISN (mV) 75 75 NEGATIVE RISING 1.20 3 –310 73 73 1.19 FALLING MODE = 2V, DCM MODE (V) ISP-ISN (mV) 1.18 2 –320 70 70 1.17 POSITIVE FALLING 1.16 1 –330 POSITIVE FBY CURRENT PIN (µA) 68 68 NEGATIVE FALLING 1.15 0 –340 65 65 1.14 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8709 G10 8709 G11 8709 G12
EN/FBIN Thresholds vs EN/FBIN Pin Current (0V to 2V) vs EN/FBIN Pin Current (0V to 80V) Temperature (1.7V and 1.3V) Temperature vs Temperature
1.40 1.75 35 600 –40°C –40°C 1.38 1.73 30 25°C 25°C 125°C 500 125°C 1.36 RISING ONLY 1.71 EN/FBIN ACTIVE MODE (V) 25 1.34 1.69 400 1.32 1.67 20 RISING 1.30 1.65 300 15 1.28 1.63 200 1.26 1.61 10 EN/FBIN CHIP ENABLE (V) FALLING EN/FBIN PIN CURRENT (µA) EN/FBIN PIN CURRENT (µA) 1.24 1.59 5 100 1.22 1.57 1.20 1.55 0 0 –50 –25 0 25 50 75 100 125 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 0 10 20 30 40 50 60 70 80 TEMPERATURE (°C) EN/FBIN VOLTAGE (V) EN/FBIN VOLTAGE (V) 8709 G13 8709 G14 8709 G15
Oscillator Frequency vs Oscillator Frequency During BG and TG Transition Time vs Cap Temperature (100kHz and 750kHz) Soft-Start Load
) 900 1 80 NOM BG RISING 800 /F 70 BG FALLING SW TG RISING 700 RT = 46.4kΩ 60 TG FALLING 600 50 500 (kHz) 1/2 40 f OSC 400 TOR FREQUENCY (F 30 300 1/3 TRANSITION TIME (ns) 1/4 20 200 R 1/5 T = 357kΩ 100 10 NONINVERTING INVERTING CONFIGURATIONS CONFIGURATIONS 0 0 0 –50 –25 0 25 50 75 100 125 –75 –50 –25 0 25 50 75 0 2 4 6 8 10 NORMALIZED OSCILLA TEMPERATURE (°C) FBY CURRENT (µA) CAP LOAD (nF) 8709 G16 8709 G18 8709 G17 8709fa For more information www.linear.com/LT8709 7
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, all voltages relative to –VIN unless otherwise noted. DCM Comparator Threshold vs PG Threshold vs Temperature MODE Pin Threshold vs Temperature (Rising and Falling) Temperature (Rising and Falling)
6 –280 80 80 1.24 NEGA 1.23 5 –290 TIVE FBY CURRENT OUT OF PIN (µA) 78 78 1.22 POSITIVE RISING MODE = 0V, FCM RISING 1.21 4 –300 ISP-ISN (mV) 75 75 NEGATIVE RISING 1.20 3 –310 73 73 1.19 FALLING MODE = 2V, DCM MODE (V) ISP-ISN (mV) 1.18 2 –320 70 70 1.17 POSITIVE FALLING 1.16 1 –330 POSITIVE FBY CURRENT PIN (µA) 68 68 NEGATIVE FALLING 1.15 0 –340 65 65 1.14 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8709 G10 8709 G11 8709 G12
EN/FBIN Thresholds vs EN/FBIN Pin Current (0V to 2V) vs EN/FBIN Pin Current (0V to 80V) Temperature (1.7V and 1.3V) Temperature vs Temperature
1.40 1.75 35 600 –40°C –40°C 1.38 1.73 30 25°C 25°C 125°C 500 125°C 1.36 RISING ONLY 1.71 EN/FBIN ACTIVE MODE (V) 25 1.34 1.69 400 1.32 1.67 20 RISING 1.30 1.65 300 15 1.28 1.63 200 1.26 1.61 10 EN/FBIN CHIP ENABLE (V) FALLING EN/FBIN PIN CURRENT (µA) EN/FBIN PIN CURRENT (µA) 1.24 1.59 5 100 1.22 1.57 1.20 1.55 0 0 –50 –25 0 25 50 75 100 125 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 0 10 20 30 40 50 60 70 80 TEMPERATURE (°C) EN/FBIN VOLTAGE (V) EN/FBIN VOLTAGE (V) 8709 G13 8709 G14 8709 G15
Oscillator Frequency vs Oscillator Frequency During BG and TG Transition Time vs Cap Temperature (100kHz and 750kHz) Soft-Start Load
) 900 1 80 NOM BG RISING 800 /F 70 BG FALLING SW TG RISING 700 RT = 46.4kΩ 60 TG FALLING 600 50 500 (kHz) 1/2 40 f OSC 400 TOR FREQUENCY (F 30 300 1/3 TRANSITION TIME (ns) 1/4 20 200 R 1/5 T = 357kΩ 100 10 NONINVERTING INVERTING CONFIGURATIONS CONFIGURATIONS 0 0 0 –50 –25 0 25 50 75 100 125 –75 –50 –25 0 25 50 75 0 2 4 6 8 10 NORMALIZED OSCILLA TEMPERATURE (°C) FBY CURRENT (µA) CAP LOAD (nF) 8709 G16 8709 G18 8709 G17 8709fa For more information www.linear.com/LT8709 7
