LM25005

SNVS411C – JANUARY 2006 – REVISED MARCH 2013

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Electrical Characteristics

Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction

Temperature range. VIN = 24V, RT = 32.4kΩ unless otherwise stated.

(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

20

mA

VCC SUPPLY

Vcc UVLO Threshold

(Vcc increasing)

5.95

6.35

6.75

V

Vcc Undervoltage Hysteresis

1

V

Bias Current (Iin)

FB = 1.3V

3

4.5

mA

Shutdown Current (Iin)

SD = 0V

50

85

µA

SHUTDOWN THRESHOLDS

Shutdown Threshold

(SD Increasing)

0.5

0.7

0.9

V

Shutdown Hysteresis

0.1

V

Standby Threshold

(Standby Increasing)

1.18

1.225

1.27

V

Standby Hysteresis

0.1

V

SD Pull-up Current Source

5

µA

SWITCH CHARACTERSICS

Buck Switch Rds(on)

160

320

m

Ω

BOOST UVLO

3.8

V

BOOST UVLO Hysteresis

0.56

V

Pre-charge Switch Rds(on)

75

Ω

Pre-charge Switch on-time

275

ns

CURRENT LIMIT

Cycle by Cycle Current Limit

RAMP = 0V

3

3.5

4.25

A

Cycle by Cycle Current Limit Delay

RAMP = 2.5V

100

ns

SOFT-START

SS Current Source

7

10

14

µA

OSCILLATOR

Frequency1

180

200

220

KHz

Frequency2

RT = 11k

Ω

425

485

525

KHz

SYNC Source Impedance

10

k

Ω

SYNC Sink Impedance

160

Ω

SYNC Threshold (falling)

1.4

V

Upper SYNC Frequency

550

KHz

SYNC Pulse Width Minimum

15

ns

RAMP GENERATOR

Ramp Current 1

Vin = 36V, Vout=10V

136

160

184

µA

Ramp Current 2

Vin = 10V, Vout=10V

18

25

32

µA

PWM COMPARATOR

Forced Off-time

500

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 Average Outgoing Quality Level (AOQL).

4

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