Datasheet LT8604 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | High Efficiency 42V/120mA Synchronous Buck |
| Pages / Page | 20 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Frequency Foldback. Soft-Start … |
| File Format / Size | PDF / 2.8 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Frequency Foldback. Soft-Start Tracking. Soft-Start Current vs Temperature. VIN UVLO
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LT8604
TYPICAL PERFORMANCE CHARACTERISTICS Frequency Foldback Soft-Start Tracking Soft-Start Current vs Temperature
2500 1.0 2.8 RT = 18.2kΩ 2250 0.9 2.6 2000 0.8 2.4 1750 0.7 2.2 1500 0.6 1250 TAGE (V) 0.5 2.0 T CURRENT (µA) 1000 0.4 AR 1.8 FB VOL 750 0.3 T-ST 1.6 SOF SWITCHING FREQUENCY (kHz) 500 0.2 1.4 250 0.1 0 0 1.2 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 –50 –25 0 25 50 75 100 125 150 FB VOLTAGE (V) TR/SS VOLTAGE (V) TEMPERATURE (°C) 8604 G18 8604 G19 8604 G20
VIN UVLO PG Thresholds Bias Pin Current
3.00 10.0 1.8 VIN = 12V V 7.5 OUT = 5V (%) RISING 1.6 2.80 ILOAD = 100mA REF 5.0 1.4 2.60 2.5 0 1.2 UVLO (V) 2.40 V IN –2.5 1.0 –5.0 BIAS PIN CURRENT (mA) 2.20 FALLING 0.8 –7.5 VBIAS = 3.3V PG THRESHOLD OFFSET FROM V VBIAS = 5V 2.00 –10.0 0.6 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2.0 2.2 TEMPERATURE (°C) TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) 8604 G21 8604 G22 8604 G23
Start-Up Dropout Start-Up Dropout
7 7 7 7 RLOAD = 400Ω RLOAD = 40Ω 6 6 6 6 OUTPUT VOL OUTPUT VOL 5 5 5 5 4 4 4 4 TAGE (V) TAGE (V) VIN T VIN T 3 3 AGE (V) 3 3 AGE (V) INPUT VOL 2 2 INPUT VOL 2 2 VOUT VOUT 1 1 1 1 0 0 0 0 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) INPUT VOLTAGE (V) 8604 G24 8604 G25 Rev. 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Frequency Foldback Soft-Start Tracking Soft-Start Current vs Temperature
2500 1.0 2.8 RT = 18.2kΩ 2250 0.9 2.6 2000 0.8 2.4 1750 0.7 2.2 1500 0.6 1250 TAGE (V) 0.5 2.0 T CURRENT (µA) 1000 0.4 AR 1.8 FB VOL 750 0.3 T-ST 1.6 SOF SWITCHING FREQUENCY (kHz) 500 0.2 1.4 250 0.1 0 0 1.2 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 –50 –25 0 25 50 75 100 125 150 FB VOLTAGE (V) TR/SS VOLTAGE (V) TEMPERATURE (°C) 8604 G18 8604 G19 8604 G20
VIN UVLO PG Thresholds Bias Pin Current
3.00 10.0 1.8 VIN = 12V V 7.5 OUT = 5V (%) RISING 1.6 2.80 ILOAD = 100mA REF 5.0 1.4 2.60 2.5 0 1.2 UVLO (V) 2.40 V IN –2.5 1.0 –5.0 BIAS PIN CURRENT (mA) 2.20 FALLING 0.8 –7.5 VBIAS = 3.3V PG THRESHOLD OFFSET FROM V VBIAS = 5V 2.00 –10.0 0.6 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2.0 2.2 TEMPERATURE (°C) TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) 8604 G21 8604 G22 8604 G23
Start-Up Dropout Start-Up Dropout
7 7 7 7 RLOAD = 400Ω RLOAD = 40Ω 6 6 6 6 OUTPUT VOL OUTPUT VOL 5 5 5 5 4 4 4 4 TAGE (V) TAGE (V) VIN T VIN T 3 3 AGE (V) 3 3 AGE (V) INPUT VOL 2 2 INPUT VOL 2 2 VOUT VOUT 1 1 1 1 0 0 0 0 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) INPUT VOLTAGE (V) 8604 G24 8604 G25 Rev. 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
