Datasheet LTM4618 (Analog Devices) - 4

LTM4618
elecTrical characTerisTics The
l
denotes the specifications which apply over the full internal operating temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, per typical application in Figure 21. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Control Section
VFB Error Amplifier Feedback Voltage IOUT = 0A, VOUT = 2.5V 0.792 0.8 0.808 V l 0.788 0.8 0.808 V IFB Error Amplifier Feedback Current (Note 3) –10 –50 nA VOVL Feedback Voltage Lockout Measured at VFB 0.84 0.86 0.88 V ITK/SS Soft-Start Charge Current VTK/SS = 0V 0.9 1.3 1.7 µA DFMAX Maximum Duty Factor In Dropout (Note 3) 97 % tON(MIN) Minimum On-Time (Note 3) 90 ns fNOM Nominal Frequency VFREQ = 1.2V 450 500 550 kHz fLOW Lowest Frequency VFREQ = 0V 210 250 290 kHz fHIGH Highest Frequency 2.4V ≤ VFREQ ≤ INTVCC 700 780 860 kHz VIH(MODE/PLLIN) Synchronous Clock High Level 2.0 V VIL(MODE/PLLIN) Synchronous Clock Low Level 0.8 V RMODE/PLLIN MODE/PLLIN Input Resistance 250 kΩ IFREQ FREQ Pin Sinking Current fMODE/PLLIN > fOSC –13 µA Sourcing Current fMODE/PLLIN < fOSC 13 µA VRUN RUN Pin On Threshold RUN Rising 1.1 1.22 1.35 V VRUN Hysteresis RUN Pin Hysteresis 120 mV RFBHI Resistor Between VOUT and VFB Pins 60.1 60.4 60.7 kΩ
PGOOD Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±2 µA VPG PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Negative –5 –7.5 –10 % VFB Ramping Positive 5 7.5 10 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings internal operating temperature range. Note that the maximum ambient may cause permanent damage to the device. Exposure to any Absolute temperature consistent with these specifications is determined by specific Maximum Rating condition for extended periods may affect device operating conditions in conjunction with board layout, the rated package reliability and lifetime. thermal resistance and other environmental factors.
Note 2:
The LTM4618 is tested under pulsed load conditions such that
Note 3:
100% tested at wafer level only. TJ ≈ TA. The LTM4618E is guaranteed to meet performance specifications
Note 4:
See Output Current Derating curves for different VIN, VOUT and TA. over the 0°C to 125°C internal operating temperature range. Specifications
Note 5:
For input voltages less than 6V, tie the V over the full –40°C to 125°C internal operating temperature range are IN, INTVCC and EXTVCC together. The LTM4618 will operate from 5V inputs, but V assured by design, characterization and correlation with statistical process IN, INTVCC and EXTV controls. The LTM4618I is guaranteed to meet specifications over the full CC need to be tied together. 4618fb 4 For more information www.linear.com/LTM4618 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Photograph Package Description Revision History Typical Application Related Parts