Datasheet LT1073 (Analog Devices) - 3

LT1073
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 1.5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IREV Reverse Battery Current (Note 5) 750 mA ILIM Current Limit 220Ω Between ILIM and VIN 400 mA Current Limit Temperature Coefficient –0.3 %/°C ILEAK Switch OFF Leakage Current Measured at SW1 Pin 1 10 µA VSW2 Maximum Excursion Below GND ISW1 ≤ 10µA, Switch Off –400 –350 mV
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 4:
100k resistor connected between a 5V source and the AO pin. of a device may be impaired.
Note 5:
The LT1073 is guaranteed to withstand continuous application of
Note 2:
This specification guarantees that both the high and low trip point 1.6V applied to the GND and SW2 pins while VIN, ILIM and SW1 pins are of the comparator fall within the 202mV to 222mV range. grounded.
Note 3:
This specification guarantees that the output voltage of the fixed versions will always fall within the specified range. The waveform at the SENSE pin will exhibit a sawtooth shape due to the comparator hysteresis.
TYPICAL PERFORMANCE CHARACTERISTICS Saturation Voltage Step-Up Mode Switch ON Voltage Step-Down Mode (SW2 Pin Grounded) (SW1 Pin Connected to VIN) Maximum Switch Current vs RLIM
1.2 1.4 1200 VIN = 1.5V 1100 L = 82µH 1.0 1.3 1000 VIN = 3V VIN = 1.25V 1.2 900 0.8 800 (V) VIN = 1V 1.1 700 0.6 VIN = 5V 600 V CESAT 1.0 V 0.4 VIN = 3V 500 IN = 1.5V 0.9 400 V SWITCH CURRENT (mA) IN = 2V SWITCH ON VOLTAGE (V) 0.2 300 0.8 200 0 0.7 100 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 10 100 1000 ISWITCH (A) ISWITCH (A) RLIM (Ω) 1073 G01 1073 G02 1073 G03
FB Pin Bias Current vs SET Pin Bias Current vs Temperature Temperature “Gain Block” Gain
20 200 1800 VIN = 1.5V 18 175 1600 RL = 100k 16 150 1400 1200 14 125 1000 12 100 800 10 75 GB GAIN (V/V) 600 FB BIAS CURRENT (nA) 8 50 SET PIN BIAS CURRENT (nA) 400 6 25 200 4 0 0 –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) 1073 G04 1073 G05 1073 G06 Rev B 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagrams Operation Applications Information Typical Applications Package Description Typical Application Related Parts