Datasheet LTC1627 (Analog Devices) - 3

LTC1627
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Input Voltage Efficiency vs Load Current Efficiency vs Load Current
100 100 100 VIN = 3.6V V Burst Mode OUT = 2.5V 95 95 L = 15µH OPERATION 95 I V V DR = 0V DR = 0V LOAD = 100mA 90 90 I 90 LOAD = 300mA VDR = –VIN 85 85 ILOAD = 10mA SYNCHRONIZED 85 AT 525kHz EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 80 80 FORCED V VIN = 3.6V CONTINUOUS 80 OUT = 2.5V L = 15µH 75 VOUT = 2.5V 75 V L = 15µH DR = 0V Burst Mode OPERATION Burst Mode OPERATION 75 70 70 0 2 4 6 8 10 1 10 100 1000 1 10 100 1000 INPUT VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 1627 G01 1627 G02 1627 G03
Undervoltage Lockout Threshold DC Supply Current* Efficiency vs Load Current vs Temperature vs Input Voltage
100 2.75 550 TJ = 25°C VIN = 2.8V 2.70 500 VOUT = 1.8V 95 2.65 450 V SYNCHRONIZED AT 525kHz 90 IN = 3.6V 2.60 VIN 400 RAMPING UP 2.55 350 85 2.50 300 VIN = 7.2V EFFICIENCY (%) 80 2.45 250 VIN V BATTERY VOLTAGE (V) OUT = 2.5V 2.40 RAMPING DOWN 200 75 L = 15µH Burst Mode OPERATION VDR = 0V 2.35 150 Burst Mode OPERATION UNDERVOLTAGE LOCKOUT THRESHOLD (V) 70 2.30 100 1 10 100 1000 – 50 – 25 0 25 50 75 100 125 2.5 3.5 4.5 5.5 6.5 7.5 8.5 OUTPUT CURRENT (mA) TEMPERATURE (°C) INPUT VOLTAGE (V) 1627 G04 1627 G05 1627 G06 *DOES NOT INCLUDE GATE CHARGE CURRENT
Supply Current in Shutdown Reference Voltage Forced Continuous Threshold vs Input Voltage vs Temperature Voltage vs Temperature
22 0.808 0.808 V V RUN/SS = 0V IN = 5V VIN = 5V 20 0.806 0.806 µA) TJ = 85°C 18 0.804 0.804 TJ = 25°C 16 0.802 0.802 14 0.800 0.800 12 0.798 0.798 TJ = –40°C 10 0.796 0.796 REFERENCE VOLTAGE (V) 8 0.794 0.794 6 0.792 0.792 SUPPLY CURRENT IN SHUTDOWN ( 4 0.790 0.790 FORCED CONTINUOUS THRESHOLD VOLTAGE (V) 2.5 3.5 4.5 5.5 6.5 7.5 8.5 – 50 – 25 0 25 50 75 100 125 – 50 – 25 0 25 50 75 100 125 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 1627 G07 1627 G08 1627 G09 3