Datasheet LTC1876 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator |
| Pages / Page | 36 / 7 — TYPICAL PERFOR A CE CHARACTERISTICS. EXTV. Undervoltage Lockout vs. CC … |
| File Format / Size | PDF / 372 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. EXTV. Undervoltage Lockout vs. CC and Switch Resistance vs. Oscillator Frequency vs
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LTC1876
W U TYPICAL PERFOR A CE CHARACTERISTICS EXTV Undervoltage Lockout vs CC and Switch Resistance vs Oscillator Frequency vs Temperature Temperature (Controller) Temperature (Controller)
10 350 3.50 VFREQSET = 5V ) Ω 300 3.45 8 250 V 3.40 FREQSET = OPEN 6 200 3.35 150 V 4 FREQSET = 0V SWITCH RESISTANCE ( FREQUENCY (kHz) 3.30 100 CC 2 UNDERVOLTAGE LOCKOUT (V) EXTV 50 3.25 0 0 3.20 –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) 1876 G19 1876 G20 1876 G21
Shutdown Latch Thresholds vs Quiescent Current for Auxillary Temperature Shutdown Pin Current (IAUXVFB) Regulator
4.5 40 4.6 VFB = 1.3V 4.0 LATCH ARMING NOT SWITCHING 35 4.5 3.5 µA) 4.4 30 3.0 4.3 LATCHOFF TA = 25°C THRESHOLD 25 4.2 2.5 TA = 100°C 20 4.1 2.0 V V IN = 3.3V IN = 5V 15 4.0 1.5 3.9 1.0 10 QUIESCENT CURRENT (mA) SHUTDOWN PIN CURRENT ( 3.8 SHUTDOWN LATCH THRESHOLDS (V) 0.5 5 3.7 0 0 3.6 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 –50 0 50 100 TEMPERATURE (°C) SHUTDOWN PIN VOLTAGE (V) TEMPERATURE (°C) 1876 G22 1876 G23 1876 G24
Current Limit for Auxillary Auxillary Regulator Switch Feedback Pin Voltage (AUXVFB) Regulator Oscillator Frequency
1.28 1.35 1.6 1.4 1.27 1.30 1.2 1.26 1.25 1.0 1.25 0.8 1.20 0.6 1.24 FREQUENCY (MHz) 1.15 CURRENT LI MIT (A) FEEDBACK VOLTAGE (V) 0.4 1.23 1.10 0.2 1.22 0 1.05 –50 –25 0 25 50 75 100 10 20 30 40 50 60 70 80 90 –50 –30 –10 10 30 50 70 90 110 TEMPERATURE (°C) TEMPERATURE ( DUTY CYCLE (%) °C) 1876 G25 1876 G28 1876 G26 1876fa 7
W U TYPICAL PERFOR A CE CHARACTERISTICS EXTV Undervoltage Lockout vs CC and Switch Resistance vs Oscillator Frequency vs Temperature Temperature (Controller) Temperature (Controller)
10 350 3.50 VFREQSET = 5V ) Ω 300 3.45 8 250 V 3.40 FREQSET = OPEN 6 200 3.35 150 V 4 FREQSET = 0V SWITCH RESISTANCE ( FREQUENCY (kHz) 3.30 100 CC 2 UNDERVOLTAGE LOCKOUT (V) EXTV 50 3.25 0 0 3.20 –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) 1876 G19 1876 G20 1876 G21
Shutdown Latch Thresholds vs Quiescent Current for Auxillary Temperature Shutdown Pin Current (IAUXVFB) Regulator
4.5 40 4.6 VFB = 1.3V 4.0 LATCH ARMING NOT SWITCHING 35 4.5 3.5 µA) 4.4 30 3.0 4.3 LATCHOFF TA = 25°C THRESHOLD 25 4.2 2.5 TA = 100°C 20 4.1 2.0 V V IN = 3.3V IN = 5V 15 4.0 1.5 3.9 1.0 10 QUIESCENT CURRENT (mA) SHUTDOWN PIN CURRENT ( 3.8 SHUTDOWN LATCH THRESHOLDS (V) 0.5 5 3.7 0 0 3.6 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 –50 0 50 100 TEMPERATURE (°C) SHUTDOWN PIN VOLTAGE (V) TEMPERATURE (°C) 1876 G22 1876 G23 1876 G24
Current Limit for Auxillary Auxillary Regulator Switch Feedback Pin Voltage (AUXVFB) Regulator Oscillator Frequency
1.28 1.35 1.6 1.4 1.27 1.30 1.2 1.26 1.25 1.0 1.25 0.8 1.20 0.6 1.24 FREQUENCY (MHz) 1.15 CURRENT LI MIT (A) FEEDBACK VOLTAGE (V) 0.4 1.23 1.10 0.2 1.22 0 1.05 –50 –25 0 25 50 75 100 10 20 30 40 50 60 70 80 90 –50 –30 –10 10 30 50 70 90 110 TEMPERATURE (°C) TEMPERATURE ( DUTY CYCLE (%) °C) 1876 G25 1876 G28 1876 G26 1876fa 7
