LM5574, LM5574-Q1

SNVS478F – JANUARY 2007 – REVISED APRIL 2013

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Electrical Characteristics

(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

STARTUP REGULATOR

VccReg

Vcc Regulator Output

6.85

7.15

7.45

V

Vcc LDO Mode turn-off

9

V

Vcc Current Limit

Vcc = 0V

25

mA

VCC SUPPLY

Vcc UVLO Threshold

(Vcc increasing)

5.03

5.35

5.67

V

Vcc Undervoltage Hysteresis

0.35

V

Bias Current (Iin)

FB = 1.3V

3.7

4.5

mA

Shutdown Current (Iin)

SD = 0V

57

85

µA

SHUTDOWN THRESHOLDS

Shutdown Threshold

(SD Increasing)

0.47

0.7

0.9

V

Shutdown Hysteresis

0.1

V

Standby Threshold

(Standby Increasing)

1.17

1.225

1.28

V

Standby Hysteresis

0.1

V

SD Pull-up Current Source

5

µA

SWITCH CHARACTERSICS

Buck Switch Rds(on)

750

1500

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 = 0V

0.6

0.7

0.8

A

Cycle by Cycle Current Limit Delay

RAMP = 2.5V

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

Vin = 60V, Vout=10V

467

550

633

µA

Ramp Current 2

Vin = 10V, Vout=10V

36

50

64

µA

PWM COMPARATOR

Forced Off-time

416

500

575

ns

Min On-time

80

ns

COMP to PWM Comparator Offset

0.7

V

(1)

Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation

using Statistical Quality Control (SQC) methods. Limits are used to calculate Texas Instruments' Average Outgoing Quality Level

(AOQL).

4

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