LM5574-Q1

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SNOSB22C – OCTOBER 2008 – REVISED OCTOBER 2014

6.4 Thermal Information

LM5574-Q1

PW

UNIT

16 PINS

Junction-to-ambient thermal resistance

90

°C/W

Junction-to-case (top) thermal resistance

30

(1)

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

6.5 Electrical Characteristics

junction temperature range unless otherwise stated.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

STARTUP REGULATOR

6.85

7.15

7.5

V

9

V

25

mA

VCC SUPPLY

5.01

5.35

5.69

V

0.35

V

Bias Current (Iin)

FB = 1.3 V

3.7

4.5

mA

Shutdown Current (Iin)

SD = 0 V

57

85

µA

SHUTDOWN THRESHOLDS

Shutdown Threshold

(SD Increasing)

0.43

0.7

0.9

V

Shutdown Hysteresis

0.1

V

Standby Threshold

(Standby Increasing)

1.15

1.225

1.3

V

Standby Hysteresis

0.1

V

SD Pull-up Current Source

5

µA

SWITCH CHARACTERISTICS

Buck Switch Rds(on)

750

1650

m

Ω

BOOST UVLO

4

V

BOOST UVLO Hysteresis

0.56

V

Pre-charge Switch Rds(on)

70

Ω

Pre-charge Switch on-time

250

ns

CURRENT LIMIT

Cycle by Cycle Current Limit

RAMP = 0 V

0.58

0.7

0.9

A

Cycle by Cycle Current Limit Delay

RAMP = 2.5 V

75

ns

SOFT-START

SS Current Source

7

10

14

µA

OSCILLATOR

Frequency1

180

200

220

kHz

Frequency2

425

485

545

kHz

SYNC Source Impedance

11

k

Ω

SYNC Sink Impedance

110

Ω

SYNC Threshold (falling)

1.3

V

SYNC Frequency

550

kHz

SYNC Pulse Width Minimum

15

ns

RAMP GENERATOR

Ramp Current 1

467

550

633

µA

Ramp Current 2

36

50

64

µA

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