LM34919B datasheet(4/20 Pages) NSC

4 / 20 page

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

VIN to RTN

44V

BST to RTN

52V

SW to RTN (Steady State)

-1.5V to 44V

ESD Rating (Note 2)

Human Body Model

2kV

BST to VCC

44V

BST to SW

14V

VCC to RTN

14V

SGND to RTN

-0.3V to +0.3V

SS, RON/SD to RTN

-0.3V to 4V

FB to RTN

-0.3 to 7V

Storage Temperature Range

-65°C to +150°C

For soldering specs see:

www.national.com/ms/MS/MS-SOLDERING.pdf

JunctionTemperature

150°C

Operating Ratings (Note 1)

VIN

6.0V to 40V

Junction Temperature

−40°C to + 125°C

Electrical Characteristics Specifications with standard type are for T

J = 25°C only; limits in boldface type apply

over the full Operating Junction Temperature (T

J) range. Minimum and Maximum limits are guaranteed through test, design, or

statistical correlation. Typical values represent the most likely parametric norm at T

J = 25°C, and are provided for reference

purposes only. Unless otherwise stated the following conditions apply: V

IN = 12V, RON = 20kΩ. See (Note 4).

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Start-Up Regulator, V

CCReg

CC regulated output

IN = 12V

6.6

7.4

IN =6V, ICC = 3 mA,

5.3

5.91

IN-VCC dropout voltage

CC = 0 mA, non-switching

CC = UVLOVCC + 250 mV

CC Output Impedance

0 mA

≤ I

CC ≤ 5 mA, VIN = 6V

Ω

0 mA

≤ I

CC ≤ 5 mA, VIN = 8V

CC current limit (Note 3)

CC = 0V

UVLO

VCC

CC under-voltage lockout threshold

measured at V

CC increasing

5.25

CC decreasing

5.1

5.25

UVLO

VCC hysteresis, at VCC

150

CC under-voltage lock-out threshold

measured at V

IN increasing, ICC = 3 mA

5.25

5.6

IN decreasing, ICC = 3 mA

5.1

5.4

UVLO

VCC filter delay

100 mV overdrive

µs

IN operating current

Non-switching, FB = 3V, SW = Open

0.78

1.0

IN shutdown current

RON/SD = 0V, SW = Open

215

330

µA

Switch Characteristics

Rds(on)

Buck Switch Rds(on)

TEST = 200 mA

0.5

1.0

Ω

UVLO

Gate Drive UVLO

BST - VSW Increasing

2.65

3.6

4.40

BST - VSW Decreasing

3.2

UVLO

GD hysteresis

400

Softstart Pin

Pull-up voltage

2.5

Internal current source

SS = 1V

10.5

µA

Current Limit

LIM

Threshold

Current out of ISEN

0.52

0.64

0.76

Resistance from ISEN to SGND

135

Ω

Response time

On Timer

ON - 1

On-time

IN = 12V, RON = 20kΩ

127

170

213

ON - 2

On-time

IN = 24V, RON = 20 kΩ

110

ON - 3

On-time

IN = 6V, RON = 20 kΩ

335

Shutdown threshold

Voltage at RON/SD rising

0.4

0.74

1.2

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