Datasheet LTC1707 (Analog Devices) - 3

LTC1707
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Input Voltage Efficiency vs Load Current Efficiency vs Load Current
100 100 100 95 VIN = 2.8V Burst Mode 95 95 90 OPERATION ILOAD = 100mA 85 V 90 IN = 3.6V I 90 LOAD = 300mA 80 PULSE SKIPPING MODE 75 85 ILOAD = 10mA 85 70 VIN = 7.2V EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 80 65 80 60 VOUT = 2.5V VIN = 3.6V 75 VOUT = 2.5V L = 15µH 55 V L = 15µH OUT = 2.5V Burst Mode OPERATION L = 15µH Burst Mode OPERATION 75 50 70 0 2 4 6 8 10 1 10 100 1000 1 10 100 1000 INPUT VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 1707 G01 1707 G02 1707 G03
Undervoltage Lockout Threshold DC Supply Current Supply Current in Shutdown vs Temperature vs Input Voltage vs Input Voltage
3.00 350 22 VRUN/SS = 0V 2.95 20 300 µA) T 2.90 PULSE SKIPPING J = 85°C VIN 18 µA) MODE T 2.85 RAMPING UP 250 J = 25°C 16 2.80 200 14 Burst Mode 2.75 OPERATION 150 12 2.70 VIN TJ = –40°C RAMPING DOWN 10 2.65 100 DC SUPPLY CURRENT ( 8 2.60 T 50 J = 25°C 2.55 VOUT = 1.8V SUPPLY CURRENT IN SHUTDOWN ( 6 UNDERVOLTAGE LOCKOUT THRESHOLD (V) LOAD CURRENT = 0A 2.50 0 4 – 50 – 25 0 25 50 75 100 125 2.5 3.5 4.5 5.5 6.5 7.5 8.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 TEMPERATURE (°C) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1707 G04 1707 G05 1707 G06
Reference Voltage Oscillator Frequency Oscillator Frequency vs Temperature vs Temperature vs Input Voltage
1.200 390 390 VIN = 5V VIN = 5V 380 380 1.195 370 370 360 360 350 350 1.190 340 340 330 330 REFERENCE VOLTAGE (V) 1.185 320 320 OSCILLATOR FREQUENCY (kHz) OSCILLATOR FREQUENCY (kHz) 310 310 1.180 300 300 – 50 – 25 0 25 50 75 100 125 – 50 – 25 0 25 50 75 100 125 2.5 3.5 4.5 5.5 6.5 7.5 8.5 TEMPERATURE (°C) TEMPERATURE (°C) INPUT VOLTAGE (V) 1707 G07 1707 G08 1627 G09 3