Datasheet

LM5008A
SNVS583F MARCH 2009REVISED MARCH 2013
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Electrical Characteristics
Specifications with standard typeface are for T
J
= 25°C, and those with boldface type apply over full Operating Junction
Temperature range. V
IN
= 48V, unless otherwise stated
(1)
.
Symbol Parameter Conditions Min Typ Max Unit
VCC Supply
Vcc Reg Vcc Regulator Output Vin = 48V 6.6 7 7.4 V
Vin – Vcc 6V < Vin < 8.5V 100 mV
Vcc Bypass Threshold Vin Increasing 8.5 V
Vcc Bypass Hysteresis 300 mV
Vcc Output Impedance Vin =6V 100
Vin = 10V 8.8
Vin = 48V 0.8
Vcc Current Limit Vin = 48V 9.2 mA
Vcc UVLO Vcc Increasing 5.3 V
Vcc UVLO hysteresis 190 mV
Vcc UVLO filter delay 3 µs
Iin Operating current FB = 3V, Vin = 48V 550 750 µA
Iin Shutdown Current RT/SD = 0V 110 176 µA
Switch Characteristics
Buck switch Rds(on) Itest = 200 mA 1.25 2.57
Gate Drive UVLO Vbst – Vsw Rising 2.8 3.8 4.8 V
Gate Drive UVLO hysteresis 490 mV
Pre-charge switch voltage At 1 mA 0.8 V
Pre-charge switch on-time 150 ns
Current Limit
Current Limit Threshold 0.41 0.51 0.61 A
Current Limit Response Time I
switch
Overdrive = 0.1A, Time to Switch Off 350 ns
T
OFF-1
OFF time generator FB=0V, R
CL
= 100K 35 µs
T
OFF-2
OFF time generator FB=2.3V, R
CL
= 100K 2.56 µs
On Time Generator
T
ON
- 1 Vin = 10V, Ron = 200K 2.15 2.77 3.5 µs
T
ON
- 2 Vin = 95V, Ron = 200K 200 300 420 ns
Remote Shutdown Threshold Rising 0.40 0.70 1.05 V
Remote Shutdown Hysteresis 35 mV
Minimum Off Time
Minimum Off Timer FB = 0V 300 ns
Regulation and OV Comparators
FB Reference Threshold Internal reference, Trip point for switch ON 2.445 2.5 2.550 V
FB Over-Voltage Threshold Trip point for switch OFF 2.875 V
FB Bias Current 100 nA
Thermal Shutdown
Tsd Thermal Shutdown Temperature 165 °C
Thermal Shutdown Hysteresis 25 °C
Thermal Resistance
θ
JA
Junction to Ambient VSSOP Package 200 °C/W
WSON Package 40 °C/W
(1) All electrical characteristics having room temperature limits are tested during production with T
A
= T
J
= 25°C. All hot and cold limits are
specified by correlating the electrical characteristics to process and temperature variations and applying statistical process control.
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