Datasheet LTC3610 (Analog Devices) - 3

LTC3610 e

lectrical characteristics
The
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denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C (Note 4). VIN = 15V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ΔVFB(LOADREG) Feedback Voltage Load Regulation ITH = 0.5V to 1.9V (Note 3) –0.05 –0.3 % IFB Feedback Input Current VFB = 0.6V –5 ±50 nA gm(EA) Error Amplifier Transconductance ITH = 1.2V (Note 3) ● 1.4 1.7 2 mS VFCB Forced Continuous Threshold ● 0.54 0.6 0.66 V IFCB Forced Continuous Pin Current VFCB = 0.6V –1 –2 µA tON On-Time ION = 60µA, VON = 1.5V 170 250 310 ns ION = 60µA, VON = 0V 120 ns tON(MIN) Minimum On-Time ION = 180µA, VON = 0V 60 100 ns tOFF(MIN) Minimum Off-Time ION = 30µA, VON = 1.5V 290 500 ns IVALLEY(MAX) Maximum Valley Current VRNG = 0.5V, VFB = 0.56V, FCB = 0V ● 7 16 A VRNG = 0V, VFB = 0.56V, FCB = 0V ● 10 19 A IVALLEY(MIN) Maximum Reverse Valley Current VRNG = 0.5V, VFB = 0.64V, FCB = 0V –6 A VRNG = 0V, VFB = 0.64V, FCB = 0V –9 A ΔVFB(OV) Output Overvoltage Fault Threshold 7 10 13 % VRUN/SS(ON) RUN Pin Start Threshold ● 0.8 1.5 2 V VRUN/SS(LE) RUN Pin Latchoff Enable Threshold RUN/SS Pin Rising 4 4.5 V VRUN/SS(LT) RUN Pin Latchoff Threshold RUN/SS Pin Falling 3.5 4.2 V IRUN/SS(C) Soft-Start Charge Current VRUN/SS = 0V –0.5 –1.2 –3 µA IRUN/SS(D) Soft-Start Discharge Current VRUN/SS = 4.5V, VFB = 0V 0.8 1.8 3 µA VIN(UVLO) Undervoltage Lockout VIN Falling ● 3.4 3.9 V VIN(UVLOR) Undervoltage Lockout Release VIN Rising ● 3.5 4 V RDS(ON) Top Switch On-Resistance 12 16 mΩ Bottom Switch On-Resistance 6.5 10 mΩ
Internal VCC Regulator
VINTVCC Internal VCC Voltage 6V < VIN < 28V, VEXTVCC = 4V ● 4.7 5 5.5 V ΔVLDO(LOADREG) Internal VCC Load Regulation ICC = 0mA to 20mA, VEXTVCC = 4V –0.1 ±2 % VEXTVCC EXTVCC Switchover Voltage ICC = 20mA, VEXTVCC Rising ● 4.5 4.7 V ΔVEXTVCC EXTVCC Switch Drop Voltage ICC = 20mA, VEXTVCC = 5V 150 300 mV ΔVEXTVCC(HYS) EXTVCC Switchover Hysteresis 500 mV
PGOOD Output
ΔVFBH PGOOD Upper Threshold VFB Rising 7 10 13 % ΔVFBL PGOOD Lower Threshold VFB Falling –7 –10 –13 % ΔVFB(HYS) PGOOD Hysteresis VFB Returning 1 2.5 % VPGL PGOOD Low Voltage IPGOOD = 5mA 0.15 0.4 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
The LTC3610 is tested in a feedback loop that adjusts VFB to may cause permanent damage to the device. Exposure to any Absolute achieve a specified error amplifier output voltage (ITH). Maximum Rating condition for extended periods may affect device
Note 4:
The LTC3610 is tested under pulsed load conditions such that reliability and lifetime. TJ ≈ TA. The LTC3610E is guaranteed to meet performance specifications
Note 2:
TJ is calculated from the ambient temperature TA and power from 0°C to 125°C. Specifications over the –40°C to 125°C operating dissipation PD as follows: temperature range are assured by design, characterization and correlation TJ = TA + (PD • 28°C/W) (θJA is simulated per JESD51-7 high effective with statistical process controls. The LTC3610I is guaranteed over the thermal conductivity test board) full –40°C to 125°C operating junction temperature range. Note that θ the maximum ambient temperature is determined by specific operating JC = 0.24°C/W (θJC is simulated when heat sink is applied at the bottom of the package). conditions in conjunction with board layout, the rated package thermal resistance and other environmental factors. 3610ff Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts