DATASHEET
ISL97519A FN6683
Rev 3.00
February 16, 2012 600kHz/1.2MHz PWM Step-Up Regulator Features The ISL97519A is a high frequency, high efficiency step-up
voltage regulator operated at constant frequency PWM mode.
With an internal 2.0A, 200mпЃ— MOSFET, it can deliver up to 1A
output current at over 90% efficiency. Two selectable
frequencies, 600kHz and 1.2MHz, allow trade offs between
smaller components and faster transient response. An
external compensation pin gives the user greater flexibility in
setting frequency compensation allowing the use of low ESR
Ceramic output capacitors. >90% Efficiency 2.0A, 200mпЃ— Power MOSFET 2.3V to 5.5V Input 1.1*VIN up to 25V Output 600kHz/1.2MHz Switching Frequency Selection Adjustable Soft-Start When shut down, it draws 2.8V 2.0 A Shutdown Input Bias Current EN = 0V 0.01 rDS(ON) Switch ON-Resistance VDD = 2.7V, ILX = 1A 0.2 ILX-LEAK Switch Leakage Current VSW = 27V 0.01 пЃ„VOUT/пЃ„VIN Line Regulation 3V < VIN < 5.5V, VOUT = 12V 0.2 % пЃ„VOUT/пЃ„IOUT Load Regulation VIN = 3.3V, VOUT = 12V, IO = 30mA to 200mA 0.3 % FOSC1 Switching Frequency Accuracy FSEL = 0V 500 620 740 kHz FOSC2 Switching Frequency Accuracy FSEL = VDD 1000 1250 1500 kHz 0.5 V IEN VIL EN, FSEL Input Low Level VIH EN, FSEL Input High Level GM Error Amp Tranconductance VDD-ON 1.228 2.3 1.5 mA 0.5 пЃ—
3 1.5
пЃ„I = 5ВµA VDD UVLO On Threshold ВµA ВµA V 70 130 150 1Вµ/пЃ— 1.95 2.1 2.25 V HYS VDD UVLO Hysteresis ISS Soft-Start Charge Current 2 3 4 ВµA Minimum Soft-Start Enable Voltage 40 65 150 mV 300 350 400 mA VSS-en
ILIM-VSS-en
OTP Current Limit Around SS Enable V
Over-Temperature Protection 140 SS = 200mV 150 mV В°C NOTE:
4. Parameters with MIN and/or MAX limits are 100% tested at +25В°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested. FN6683 Rev 3.00
February 16, 2012 Page 3 of 9 ISL97519A Typical Performance Curves
95 92 90 90
88
EFFICIENCY (%) 85 …
