Datasheet LTC3833 (Analog Devices) - 3

FabricanteAnalog Devices
DescripciónFast Accurate Step-Down DC/DC Controller with Differential Output Sensing
Páginas / Página36 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply …
Formato / tamaño de archivoPDF / 530 Kb
Idioma del documentoInglés

ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating junction

ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating junction

Línea de modelo para esta hoja de datos

Versión de texto del documento

LTC3833
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at T + A = 25°C. VIN = 15V, VFB = VOSNS – VOSNS , unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS General
VIN Input Voltage Operating Range 4.5 38 V VOUT Output Voltage Operating Range 0.6 5.5 V IQ Input DC Supply Current Normal MODE/PLLIN = INTVCC 2 4 mA Shutdown Supply Current RUN = 0V 15 25 µA tON(MIN) Minimum On-Time VIN = 38V, VOUT = 0.6V 20 ns tOFF(MIN) Minimum Off-Time 90 ns
Output Sensing
VREG Regulated Differential Feedback Voltage ITH = 1.2V (Note 5) (V + – OSNS – VOSNS ) TA = 25°C 0.5985 0.6 0.6015 V TA = 0°C to 85°C l 0.596 0.6 0.604 V TA = –40°C to 125°C l 0.594 0.6 0.606 V Regulated Differential Feedback Voltage VIN = 4.5V to 38V, ITH = 0.5V to 1.9V, Over Line, Load and Common Mode V – OSNS = ±500mV (Note 5) (V + – OSNS – VOSNS ) TA = 0°C to 85°C l 0.594 0.6 0.606 V TA = –40°C to 125°C l 0.591 0.6 0.609 V gm(EA) Error Amplifier Transconductance ITH = 1.2V (Note 5) l 1.4 1.7 2 mS I + + VOSNS VOSNS Input Bias Current VFB = 0.6V ±5 ±25 nA I – – VOSNS VOSNS Input Bias Current VFB = 0.6V –35 –50 µA
Current Sensing
VSENSE(MAX) Valley Current Sense Threshold, VRNG = 2V, VFB = 0.57V l 80 100 120 mV V + – SENSE – VSENSE , VRNG = 0V, VFB = 0.57V l 22 30 38 mV Peak Current = Valley + Ripple VRNG = INTVCC, VFB = 0.57V l 39 50 61 mV VSENSE(MIN) Minimum Current Sense Threshold, VRNG = 2V, VFB = 0.63V –50 mV V + – SENSE – VSENSE , Forced Continuous VRNG = 0V, VFB = 0.63V –15 mV Mode VRNG = INTVCC, VFB = 0.63V –25 mV VSENSE(CM) SENSE+, SENSE– Voltage Range Referenced to Signal Ground (SGND) l –0.5 5.5 V (Common Mode) ISENSE SENSE+, SENSE– Input Bias Current VSENSE(CM) = 0.6V ±5 ±50 nA VSENSE(CM) = 5V 1 4 µA
Start-Up and Shutdown
VRUN(TH) RUN Pin On Threshold VRUN Rising l 1.1 1.2 1.3 V VRUN(HYS) RUN Pin Hysteresis 70 mV ISS Soft-Start Charging Current VTRACK/SS = 0V 1.0 µA UVLOLOCK INTVCC Undervoltage Lockout INTVCC Falling l 3.4 3.65 4.0 V UVLORELEASE INTVCC Undervoltage Lockout Release INTVCC Rising l 4.2 4.5 V
Switching Frequency and Clock Synchronization
f Free Running Switching Frequency RT = 205k 175 200 225 kHz RT = 80.6k 450 500 550 kHz RT = 18.2k 1800 2000 2200 kHz VCLK(IH) Clock Input High Level into MODE/PLLIN 2 V VCLK(IL) Clock Input Low Level into MODE/PLLIN 0.5 V 3833f 3