Datasheet LTC1871-1 (Analog Devices) - 4

LTC1871-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 5V, VRUN = 1.5V, RFREQ = 80k, VMODE/SYNC = 0V, unless otherwise specifi ed. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Low Dropout Regulator
VINTVCC INTVCC Regulator Output Voltage VIN = 7.5V 5.0 5.2 5.4 V VIN = 7.5V, I-Grade (Note 2) ● 5.0 5.2 5.4 V ΔVINTVCC INTVCC Regulator Line Regulation 7.5V ≤ VIN ≤ 15V 8 25 mV ΔVIN1 ΔVINTVCC INTVCC Regulator Line Regulation 15V ≤ VIN ≤ 30V 70 200 mV ΔVIN2 VLDO(LOAD) INTVCC Load Regulation 0 ≤ IINTVCC ≤ 20mA, VIN = 7.5V – 2 –0.2 % VDROPOUT INTVCC Regulator Dropout Voltage INTVCC Load = 20mA 280 mV IINTVCC Bootstrap Mode INTVCC Supply RUN = 0V, SENSE = 5V 10 20 μA I-Grade (Note 2) ● 30 μA
GATE Driver
tr GATE Driver Output Rise Time CL = 3300pF (Note 7) 17 100 ns tf GATE Driver Output Fall Time CL = 3300pF (Note 7) 8 100 ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The dynamic input supply current is higher due to power MOSFET may cause permanent damage to the device. Exposure to any Absolute gate charging (QG • fOSC). See Applications Information. Maximum Rating condition for extended periods may affect device
Note 5:
The LTC1871-1 is tested in a feedback loop which servos VFB to reliability and lifetime. the reference voltage with the ITH pin forced to the midpoint of its voltage
Note 2:
The LTC1871E-1 is guaranteed to meet performance specifi cations range (0.3V ≤ VITH ≤ 1.2V, midpoint = 0.75V). from 0°C to 85°C junction temperature. Specifi cations over the – 40°C
Note 6:
In a synchronized application, the internal slope compensation to 85°C operating junction temperature range are assured by design, gain is increased by 25%. Synchronizing to a signifi cantly higher ratio will characterization and correlation with statistical process controls. The reduce the effective amount of slope compensation, which could result in LTC1871I-1 is guaranteed over the full –40°C to 125°C operating junction subharmonic oscillation for duty cycles greater than 50%. temperature range.
Note 7:
Rise and fall times are measured at 10% and 90% levels.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • 110°C/W)
TYPICAL PERFORMANCE CHARACTERISTICS FB Voltage vs Temp FB Voltage Line Regulation FB Pin Current vs Temperature
1.25 1.231 60 50 1.24 40 1.23 1.230 30 FB VOLTAGE (V) FB VOLTAGE (V) 20 FB PIN CURRENT (nA) 1.22 10 1.21 1.229 0 –50 –25 0 25 50 75 100 125 150 0 5 10 15 20 25 30 35 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) VIN (V) TEMPERATURE (°C) 18711 G01 18711 G02 18711 G03 18711fb 4