Datasheet LTC3850, LTC3850-1 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Dual, 2-Phase Synchronous Step-Down Switching Controller |
| Pages / Page | 38 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Tracking Up and Down. Quiescent … |
| Revision | D |
| File Format / Size | PDF / 1.2 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Tracking Up and Down. Quiescent Current. with External Ramp
Model Line for this Datasheet
- LTC3850EGN#PBF LTC3850EGN#TRPBF LTC3850EGN#WPBF LTC3850EGN#WTRPBF LTC3850EGN-1#PBF LTC3850EGN-1#TRPBF LTC3850EGN-1#WPBF LTC3850EGN-1#WTRPBF LTC3850EUF#PBF LTC3850EUF#TRPBF LTC3850EUFD#PBF LTC3850EUFD#TRPBF LTC3850IGN#PBF LTC3850IGN#TRPBF LTC3850IGN#WPBF LTC3850IGN#WTRPBF LTC3850IGN-1#PBF LTC3850IGN-1#TRPBF LTC3850IGN-1#WPBF LTC3850IGN-1#WTRPBF LTC3850IUF#PBF LTC3850IUF#TRPBF LTC3850IUFD#PBF LTC3850IUFD#TRPBF
Text Version of Document
LTC3850/LTC3850-1
TYPICAL PERFORMANCE CHARACTERISTICS Tracking Up and Down Quiescent Current with External Ramp vs Input Voltage without EXTVCC INTVCC Line Regulation
5 5.25 TK/SS1 5.00 TK/SS2 4 2V/DIV 4.75 VOUT1 3.3V 3 3Ω LOAD TAGE (V) 4.50 1V/DIV VOL 4.25 VOUT2 Y CURRENT (mA) 2 V CC 1.8V 1.5Ω LOAD INT SUPPL 4.00 1V/DIV 38501 G10 1 10ms/DIV 3.75 0 3.50 5 10 15 20 25 0 5 10 15 20 25 INPUT VOLTAGE (V) INPUT VOLTAGE (V) 38501 G11 38501 G12
Current Sense Threshold Maximum Current Sense Threshold Maximum Current Sense vs ITH Voltage vs Common Mode Voltage Threshold vs Duty Cycle
80 80 100 ILIM = INTVCC 70 ILIM = INTVCC 90 60 80 ILIM = INTVCC I 60 LIM = FLOAT 40 ILIM = FLOAT 70 50 60 (mV) ILIM = FLOAT 20 40 50 I V SENSE I LIM = GND LIM = GND 30 40 0 ILIM = GND 30 20 –20 20 CURRENT SENSE THRESHOLD (mV) 10 CURRENT SENSE THRESHOLD (mV) 10 –40 0 0 0 0.5 1 1.5 2 0 1 2 3 4 5 0 20 40 60 80 100 VITH (V) VSENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) 38501 G13 38501 G14 38501 G15
Maximum Current Sense Voltage vs TK/SS Pull-Up Current Feedback Voltage (Current Foldback) vs Temperature
80 2.00 ILIM = INTVCC 70 60 1.75 ILIM = FLOAT 50 40 1.50 ILIM = GND 30 TK/SS CURRENT (µA) 20 1.25 10 MAXIMUM CURRENT SENSE VOLTAGE (mV) 0 1.00 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 –50 –25 0 25 50 75 100 FEEDBACK VOLTAGE (V) TEMPERATURE (°C) 38501 G16 38501 G17 Rev. D For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Tracking Up and Down Quiescent Current with External Ramp vs Input Voltage without EXTVCC INTVCC Line Regulation
5 5.25 TK/SS1 5.00 TK/SS2 4 2V/DIV 4.75 VOUT1 3.3V 3 3Ω LOAD TAGE (V) 4.50 1V/DIV VOL 4.25 VOUT2 Y CURRENT (mA) 2 V CC 1.8V 1.5Ω LOAD INT SUPPL 4.00 1V/DIV 38501 G10 1 10ms/DIV 3.75 0 3.50 5 10 15 20 25 0 5 10 15 20 25 INPUT VOLTAGE (V) INPUT VOLTAGE (V) 38501 G11 38501 G12
Current Sense Threshold Maximum Current Sense Threshold Maximum Current Sense vs ITH Voltage vs Common Mode Voltage Threshold vs Duty Cycle
80 80 100 ILIM = INTVCC 70 ILIM = INTVCC 90 60 80 ILIM = INTVCC I 60 LIM = FLOAT 40 ILIM = FLOAT 70 50 60 (mV) ILIM = FLOAT 20 40 50 I V SENSE I LIM = GND LIM = GND 30 40 0 ILIM = GND 30 20 –20 20 CURRENT SENSE THRESHOLD (mV) 10 CURRENT SENSE THRESHOLD (mV) 10 –40 0 0 0 0.5 1 1.5 2 0 1 2 3 4 5 0 20 40 60 80 100 VITH (V) VSENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) 38501 G13 38501 G14 38501 G15
Maximum Current Sense Voltage vs TK/SS Pull-Up Current Feedback Voltage (Current Foldback) vs Temperature
80 2.00 ILIM = INTVCC 70 60 1.75 ILIM = FLOAT 50 40 1.50 ILIM = GND 30 TK/SS CURRENT (µA) 20 1.25 10 MAXIMUM CURRENT SENSE VOLTAGE (mV) 0 1.00 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 –50 –25 0 25 50 75 100 FEEDBACK VOLTAGE (V) TEMPERATURE (°C) 38501 G16 38501 G17 Rev. D For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
