Datasheet LT3763 (Analog Devices) - 3

LT3763
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN/UVLO = 5V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
PWM Pin Threshold (Falling Edge) 1.4 1.5 1.6 V PWM Pin Hysteresis 675 mV CTRL1 Pin Current VCTRL1 = 1.5V 20 nA CTRL2 Pin Current VCTRL1 = 1.5V, VCTRL2 = 1.5V, VFBIN = 2V 100 nA
Reference
Reference Voltage (VREF pin) l 1.94 2 2.06 V
Inductor Current Sensing
Full Range SENSE+ to SENSE– VCTRL1 = 2V, VCTRL2 > 2V, VSS = VFBIN = 2V, VC = 1.2V l 48 51 54 mV SENSE+ Pin Current V + – SENSE = VSENSE = 4V –20 µA SENSE– Pin Current V + – SENSE = VSENSE = 4V, VCTRL1 = 1.5V –40 µA
Internal VCC Regulator (INTVCC Pin)
Regulation Voltage ILOAD = 10mA l 4.8 5 5.2 V Current Limit VINTVCC = 0V 60 mA
NMOS FET Driver
Non-Overlap Time TG to BG 42 ns Non-Overlap Time BG to TG 44 ns Minimum On-Time BG (Note 4) 50 ns Minimum On-Time TG (Note 4) 55 ns Minimum Off-Time BG (Note 4) 140 ns High Side Driver Switch On-Resistance VCBOOST – VSW = 5V Gate Pull-Up 2.2 Ω Gate Pull-Down 1.3 Ω Low Side Driver Switch On-Resistance VINTVCC = 5V Gate Pull-Up 2.2 Ω Gate Pull-Down 1 Ω Switching Frequency RT = 40kΩ l 930 1000 1070 kHz RT = 221kΩ 180 200 220 kHz
Soft-Start
Charging Current 11 µA
Voltage Regulation Amplifier
Input Bias Current VFB = 1.3V 750 nA gm 850 µA/V Feedback Regulation Voltage V + – SENSE = VSENSE = VCTRL1 = 2V l 1.188 1.206 1.224 V
FAULT Comparator
Upper FAULT Threshold (FB Rising) l 1.137 1.16 1.183 V Upper FAULT Threshold Hysteresis 40 mV Lower FAULT Threshold (FB Falling) l 0.24 0.25 0.265 V Lower FAULT Threshold Hysteresis 40 mV FAULT Pull-Down Current VFAULT = 2V, VFB = 0V 8 mA
Input Voltage Regulation
FBIN Pin Current VFBIN = 1.5V 150 nA Sense Voltage V – FBIN = 1.22V, VSENSE = 4V 10 mV (V + – – SENSE – VSENSE ) VFBIN = 1.26V, VSENSE = 4V 45 mV Rev. C For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts