LM5032

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SNVS344B – MARCH 2005 – REVISED DECEMBER 2014

6.4 Thermal Information

LM5032

THERMAL METRIC(1)

PW

UNIT

16 PINS

RθJA

Junction-to-ambient thermal resistance

96.8

RθJC(top)

Junction-to-case (top) thermal resistance

30.3

RθJB

Junction-to-board thermal resistance

42.4

°C/W

ψJT

Junction-to-top characterization parameter

1.7

ψJB

Junction-to-board characterization parameter

41.8

(1)

For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

MIN and MAX limits apply –40°C

≤ TJ ≤ 125°C. VIN = 48 V, VCC = 10 V externally applied, RT = RDCL = 42.2kΩ, UVLO = 1.5

V, TJ = 25°C, unless otherwise stated, see

(1)and see(2).

SYMBOL

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

STARTUP REGULATOR (VIN, VCC Pins)

VCCReg

VCC voltage

Ext. supply disconnected.

7.4

7.7

8

V

ICC(Lim)

VCC current limit

VCC = 0V.

19

22

mA

VCC UVT

VCC Under-voltage threshold

Ext. supply disconnected, VIN =11V.

VCC -

VCC -

V

(VCC increasing)

300 mV

100 mV

VCC decreasing

5.5

6.2

6.9

V

IIN

Startup regulator current

VIN = 90V, UVLO = 0V

500

600

µA

ICCIn

Supply current into VCC from

Output loads = open, VCC = 10V

4.3

7

mA

external source

UVLO

UVLO

Under-voltage threshold

1.22

1.25

1.28

V

IHYST

Hysteresis current

16

20

24

µA

CURRENT SENSE INPUT (CS1, CS2 Pins)

CS

Current Limit Threshold

0.45

0.5

0.55

V

CS delay to output

CS1 (CS2) taken from zero to 1.0V. Time for

40

ns

OUT1 (OUT2) to fall to 90% of VCC. Output

load = 0 pF.

Leading edge blanking time at

50

ns

CS1 (CS2)

CS1 (CS2) sink impedance

Internal pull-down FET on.

30

55

Ω

(clocked)

RCS

Equivalent input resistance at CS

CS taken from 0.2V to 0.5V, internal FET off.

42

k

Ω

CURRENT LIMIT RESTART (RES Pin)

ResTh

Threshold

2.4

2.55

2.7

V

Charge source current

15

20

25

µA

Discharge sink current

7.5

10

12.5

µA

SOFT-START (SS1, SS2 Pins)

ISS

Current source (normal

35

50

65

µA

operation)

Current source during a current

0.7

1

1.3

µA

limit restart

VSS

Open circuit voltage

5

V

OSCILLATOR (RT/SYNC Pin)

FS1

Frequency 1 (at OUT1, OUT2)

RT = 42.2 kΩ

183

200

217

kHz

FS2

Frequency 2 (at OUT1, OUT2)

RT = 13.7 kΩ

530

600

670

kHz

(1)

All electrical characteristics having room temperature limits are tested during production with TA = 25°C. All hot and cold limits are

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

(2)

Typical specifications represent the most likely parametric norm at 25°C operation

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