Datasheet LTC1704, LTC1704B (Analog Devices) - 3

LTC1704/LTC1704B
ELECTRICAL CHARACTERISTICS The
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denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC = PVCC = BOOST = 5V, unless otherwise specified. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Switcher Switching Characteristics
fOSC Oscillator Frequency Test Circuit ● 460 550 650 kHz DCMAX Maximum Duty Cycle ● 87 90 93 % tNOV Driver Nonoverlap Test Circuit (Note 8) ● 10 25 120 ns tr, tf Driver Rise/Fall Time Test Circuit (Note 8) ● 15 100 ns
Linear Regulator Controller
VREGFB Feedback Voltage Test Circuit, RREGILM = 680k 0.784 0.800 0.816 V ● 0.780 0.800 0.820 V IREGFB REGFB Input Current ● ±1 µA dVREGFB Feedback Voltage Line Regulation Test Circuit, VCC = 4.5V to 5.5V ● ±0.05 ±0.2 %/V Feedback Voltage Load Regulation Test Circuit, IREGDR = 0mA to 30mA ● –0.2 –0.05 % IREGDR Driver Output Current Test Circuit ● 30 mA RREGILM = 680k, VREGFB = 0.76V, VREGDR = 3.3V 20 mA RREGILM = 680k, VREGFB = 0V, VREGDR = 1V 6 mA VDROPOUT Driver Dropout Voltage Test Circuit, IREGDR = 30mA, VREGDR = 3.3V, ● 0.65 1.1 V dVREGFB = –1% (Note 9) VREGILM REGILM Threshold Test Circuit, RREGILM = 680k 0.8 V IREGILMINT REGILM Internal Pull-Up Current VREGILM = 0V –1.9 µA VPGOOD Negative REGFB Power Good Threshold ● –15 –10 –6 % Positive REGFB Power Good Threshold ● 6 10 15 %
PGOOD
IPGOOD VPGOOD Sink Current Power Good ● 10 µA Power Bad ● 10 mA VOLPG VPGOOD Output Low Voltage IPGOOD = 1mA ● 0.03 0.1 V tPGOOD VPGOOD Falling Edge Delay (Note 8) ● 0.5 1 4 µs VPGOOD Rising Edge Delay (Note 8) ● 10 20 40 µs
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 5:
Supply current in normal operation is dominated by the current of a device may be impaired. needed to charge and discharge the external MOSFET gates. This current
Note 2:
The LTC1704E is guaranteed to meet performance specifications will vary with supply voltage and the external MOSFETs used. from 0°C to 70°C. Specifications over the – 40°C to 85°C operating
Note 6:
Supply current in shutdown is dominated by external MOSFET temperature range are assured by design, characterization and correlation leakage and may be significantly higher than the quiescent current drawn with statistical process controls. by the LTC1704, especially at elevated temperature.
Note 3:
All currents into device pins are positive; all currents out of device
Note 7:
Guaranteed by design, not subject to test. pins are negative. All voltages are referenced to ground unless otherwise
Note 8:
Rise and fall times are measured using 10% and 90% levels. Delay specified. and nonoverlap times are measured using 50% levels.
Note 4:
PVCC and BVCC (VBOOST – VSW) must be greater than VGS(ON) of
Note 9:
Dropout voltage is the minimum VCC to VREGDR voltage differential the external MOSFETs to ensure proper operation. required to maintain regulation at the specified driver output current. 1704bfa 3