Datasheet LTC7852 (Analog Devices) - 5

link to page 15 LTC7852/LTC7852-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating temperature range, otherwise specifications are at TA = 25°C (Note 2). VCC = VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Power Good
VPGOOD(ON) PGOOD Pull Down Resistance 200 Ω IPGOOD(OFF) PGOOD Leakage Current VPGOOD = 5V 2 µA tPGOOD VPGOOD High to Low Delay 45 µs VPGD PGOOD Trip Level VFB with Respect to Set Output Voltage VFB Ramping Up 5 7.5 10 % VFB Ramping Down –5 –7.5 –10 % VPG1(HYST) PGOOD Trip Level Hysteresis 15 mV
Oscillator and Phase-Locked Loop
fOSC Oscillator Frequency RFREQ = 30.1kΩ 215 250 285 kHz RFREQ = 47.5kΩ 550 600 650 kHz RFREQ = 54.9kΩ 675 750 825 kHz RFREQ = 75.0kΩ 0.875 1.05 1.225 MHz Sync. Freq. Range l 0.25 1.2 MHz IFREQ FREQ Pin Output Current VFREQ = 0.8V –18.5 20 –21.5 µA RPLLIN PLLIN Input Resistance 200 kΩ VPLLIN PLLIN Input Threshold VPLLIN Rising 2 V VPLLIN Falling 1.2 V VCLKOUT Low Output Voltage ILOAD = 500µA 0.2 V High Output Voltage ILOAD = –500µA 5 V
VDD Output
VDD Internal VDD Voltage 3.3 V
PWM Outputs
PWM PWM Output High Voltage ILOAD = –500µA l 3.1 3.3 3.5 V PWM Output Low Voltage ILOAD = 500µA l 0.5 V PWM Output Current in Hi-Z PWM = 0V –1 µA State PWM = 3.3V 1 µA
IMON Outputs (LTC7852 Only)
V1P5 1.5V Regulator Output Voltage VSNS = 0, –3mA < IV1P5 < 3mA l 1.4 1.5 1.6 V IMON IMON Output Voltage VSNS = VSNSMAX, ILIM = Float l V1P5 +142.5 V1P5 +150 V1P5 +157.5 mV
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings operating conditions in conjunction with board layout, the package thermal may cause permanent damage to the device. Exposure to any Absolute impedance and other environmental factors. Maximum Rating condition for extended periods may affect device TJ is calculated from the ambient temperature, TA, and power dissipation, reliability and lifetime. PD, according to the following formula:
Note 2:
The LTC7852/LTC7852-1 is tested under pulsed load conditions LTC7852RHE: TJ = TA + (PD • 30°C/W) such that TJ ≈ TA. The LTC7852E/LTC7852-1E is guaranteed to meet LTC7852UFD-1: TJ = TA + (PD • 43°C/W) performance specifications from 0°C to 85°C operating junction
Note 3:
Output voltage range of LTC7852-1 is determined by the DrMOS. temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and
Note 4:
The LTC7852/LTC7852-1 is tested in a feedback loop that servos correlation with statistical process controls. The LTC7852I/LTC7852-1I VITH to a specified voltage and measures the resultant VFB. is guaranteed to meet performance specifications over the full –40°C
Note 5:
Guaranteed by design. to 125°C operating junction temperature range. The maximum ambient
Note 6:
The minimum on-time condition is specified for an inductor temperature consistent with these specifications is determined by specific peak-to-peak ripple current >40% of IMAX (See Minimum On-Time Considerations in the Applications Information section). Rev A For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagrams Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts