LM5008A

SNVS583F – MARCH 2009 – REVISED MARCH 2013

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Electrical Characteristics

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

Ω

Vin = 10V

8.8

Ω

Vin = 48V

0.8

Ω

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

Ω

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

350

ns

OFF time generator

35

µs

OFF time generator

2.56

µs

On Time Generator

Vin = 10V, Ron = 200K

2.15

2.77

3.5

µs

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

Junction to Ambient

VSSOP Package

200

°C/W

WSON Package

40

°C/W

(1)

specified by correlating the electrical characteristics to process and temperature variations and applying statistical process control.

4

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