Datasheet

LM5072
www.ti.com SNVS437D –MARCH 2006–REVISED APRIL 2013
Electrical Characteristics
(1)
(continued)
Specifications in standard type face are for T
J
= +25°C and those in boldface type apply over the full operating junction
temperature range. Unless otherwise specified: V
IN
= 48V, F
OSC
= 250kHz.
Symbol Parameter Conditions Min Typ Max Units
Power Good
VDS Required for Power Good Status 1.3 1.5 1.7 V
VDS Hysteresis of Power Good Status 0.8 1.0 1.2 V
VGS Required for Power Good Status 4.5 5.5 6.5 V
Default Delay Time of Loss-of Power Good 30 µs
Status
nPGOOD current Source 45 55 65 µA
nPGOOD Pull Down Resistance 130 250 Ω
nPGOOD Threshold 2.3 2.5 2.7 V
Hot Swap
RDS(ON) Hot Swap MOSFET Resistance 0.7 1.2 Ω
Hot Swap MOSFET Leakage 110 µA
Default Inrush Current Limit V
DS
= 4.0V 120 150 180 mA
Default DC Current Limit V
DS
= 4.0V 380 440 510 mA
Front Auxiliary DC Current Limit V
DS
= 4.0V 470 540 610 mA
Inrush Current Limit Programming Accuracy V
DS
= 4.0V -15 15 %
DC Current Limit Programming Accuracy V
DS
= 4.0V -12 12 %
Auxiliary Power Option
ICL_FAUX Threshold ICL_FAUX Pin Rising 8.1 8.7 9.3 V
ICL_FAUX Pull Down Current 50 µA
RAUX Lower Threshold (I = 22 µA) RAUX Pin Rising 2.3 2.5 3.0 V
RAUX Lower Threshold Hysteresis 0.8 V
RAUX Upper Threshold (I = 250 µA) RAUX Pin Rising 5.4 6.0 6.9 V
RAUX Lower Threshold Current 16 22 28 µA
RAUX Upper Threshold Current 187 250 313 µA
VCC Regulator
VccReg VCC Regulation (VccReg) 7.4 7.7 8 V
VCC Current Limit 15 mA
VCC UVLO (Rising) VccReg VccReg mV
– 210 – 100 mV
mV
VCC UVLO (Falling) 5.9 6.2 6.5 V
VIN Supply Current V
CC
= 10V 2.0 mA
Supply Current (Icc) V
CC
= 10V 3 mA
VCC Regulator Dropout V
IN
– V
CC
(2)
6.5 V
Error Amplifier
Gain Bandwidth 3 MHz
DC Gain 67 dB
Input Voltage 1.225 1.275 V
COMP Sink Capability 5 10 mA
Current Limit
ILIM Delay to Output 30 ns
Cycle by Cycle Current Limit Threshold 0.45 0.5 0.55 V
Voltage
Leading Edge Blanking Time 65 ns
CS Sink Impedance (clocked) 35 55 Ω
(2) The VCC regulator is intended for use solely as a bias supply for the LM5072, dropout assumes 3mA of external V
CC
current.
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