Datasheet LTM4642 (Analog Devices) - 4

LTM4642
elecTrical characTerisTics The
l
denotes the specifications which apply over the full internal operating temperature range (Note 2), otherwise specifications are at TA = 25°C, VIN = 12V. Per typical application in Figure 27. Specified as each channel. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ITRACK/SS1,2 Soft-Start Charge Current 0V < TRACK/SS1,2 < 0.6V 1.0 µA DFMAX Maximum Duty Factor In Dropout (Note 4) 97 % tON(MIN) Minimum On-Time (Note 4) 30 ns tOFF(MIN) Minimum Off-Time (Note 4) 90 ns fLOW Low Frequency RFREQ = 61.9k 600 650 700 kHz fNOM Nominal Frequency RFREQ = 49.9k 730 800 850 kHz fHIGH Highest Frequency RFREQ = 27.5k 1250 1400 1500 kHz RMODE/PLLIN MODE/PLLIN Input Resistance 600 kΩ VPLLIN(HIGH) MODE/PLLIN Clock In High 2 V VPLLIN(LOW) MODE/PLLIN Clock In Low 0.5 V VRUN1, 2 RUN Pin ON/OFF Threshold RUN Rising l 1.1 1.2 1.3 V VRUN1, 2(HYS) RUN1, 2, Threshold Hysteresis Delta RUN Rising to RUN Falling 200 mV IRUN1,2 RUN Pin Pull-Up Current When Off RUN1,2 at SGND 1.2 µA IRUN1,2(HYS) RUN1,2 Pull-Up Hysteresis IRUN1,2(HYST) = IRUN1,2(ON) – IRUN1,2(OFF) (Note 4) 5 µA RUN1,2 Res RUN1,2 Resistance to Ground 100 kΩ UVLO Undervoltage Lockout INTVCC Falling (Note 4) l 3.3 3.7 V INTVCC Rising l 4.2 4.5 V RFB1, RFB2 Resistor Between VOUT and VFB 60.1 60.4 60.7 kΩ Pins for Each Channel VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±2 µA ΔVPGOOD PGOOD Range VFB Ramping Negative –5 –7.5 –10 % VFB Ramping Positive 5 7.5 10 % Ch 2 Phase Channel 2 Phase (Relative to PHASMD = SGND 180 Deg Channel 1) PHASMD = Floating 180 Deg PHASMD = INTVCC 240 Deg CLKOUT Phase CLKOUT Phase (Relative to PHASMD = SGND 60 Deg Channel 1) PHASMD = Floating 90 Deg PHASMD = INTVCC 120 Deg
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings temperature consistent with these specifications is determined by specific may cause permanent damage to the device. Exposure to any Absolute operating conditions in conjunction with board layout, the rated package Maximum Rating condition for extended periods may affect device thermal resistance and other environmental factors. reliability and lifetime.
Note 3:
The two outputs are tested separately and the same testing
Note 2:
The LTM4642E is guaranteed to meet performance specifications condition is applied to each output. over the 0°C to 125°C internal operating temperature range. Specifications
Note 4:
100% tested at wafer level only. over the full –40°C to 125°C internal operating temperature range are
Note 5:
See Output Current Derating curves for different V assured by design, characterization and correlation with statistical process IN, VOUT and TA. controls. The LTM4642I is guaranteed to meet specifications over the full
Note 6:
Consult factory for operation down at 2.375V to 2.5V input. internal operating temperature range. Note that the maximum ambient Operating frequency nominal will be reduced. 4642fb 4 For more information www.linear.com/LTM4642 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photograph Design Resources Related Parts