LM34919B

LM34919B-Q1

SNVS623B – MAY 2010 – REVISED JULY 2013

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Electrical Characteristics

Specifications with standard type are for TJ = 25°C only; limits in boldface type apply over the full Operating Junction

Temperature (TJ) range. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical

values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless

otherwise stated the following conditions apply: VIN = 12V, RON = 20 kΩ. See

(1).

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Startup Regulator, VCC

VCCReg

VCC regulated output

VIN = 12V

6.6

7

7.4

V

VIN =6V, ICC = 3 mA,

5.3

5.91

VIN-VCC dropout voltage

ICC = 0 mA, non-switching

20

mV

VCC = UVLOVCC + 250 mV

VCC Output Impedance

0 mA

≤ ICC ≤ 5 mA, VIN = 6V

24

Ω

0 mA

≤ ICC ≤ 5 mA, VIN = 8V

12

VCC current limit

(2)

VCC = 0V

15

mA

UVLOVCC

VCC under-voltage lockout threshold

VCC increasing

5.25

V

measured at VCC

VCC decreasing

5.1

5.25

V

UVLOVCC hysteresis, at VCC

150

mV

VCC under-voltage lock-out threshold

VIN increasing, ICC = 3 mA

5.25

5.6

V

measured at VIN

VIN decreasing, ICC = 3 mA

5.1

5.4

V

UVLOVCC filter delay

100 mV overdrive

3

µs

IQ

IIN operating current

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

0.78

1.0

mA

ISD

IIN shutdown current

RON/SD = 0V, SW = Open

215

330

µA

Switch Characteristics

Rds(on)

Buck Switch Rds(on)

ITEST = 200 mA

0.5

1.0

Ω

UVLOGD

Gate Drive UVLO

VBST - VSW Increasing

2.65

3.6

4.40

V

VBST - VSW Decreasing

3.2

UVLOGD hysteresis

400

mV

Softstart Pin

VSS

Pull-up voltage

2.5

V

Internal current source

VSS = 1V

10.5

µA

Current Limit

ILIM

Threshold

Current out of ISEN

0.52

0.64

0.76

A

Resistance from ISEN to SGND

135

m

Ω

Response time

50

ns

On Timer

tON - 1

On-time

VIN = 12V, RON = 20kΩ

127

170

213

ns

tON - 2

On-time

VIN = 24V, RON = 20 kΩ

110

ns

tON - 3

On-time

VIN = 6V, RON = 20 kΩ

335

ns

Shutdown threshold

Voltage at RON/SD rising

0.4

0.74

1.2

V

Threshold hysteresis

Voltage at RON/SD

40

mV

Off Timer

tOFF

Minimum Off-time

VIN = 6V, ICC = 3mA

60

88

120

ns

VIN = 8V, ICC = 3mA

58

82

118

Regulation and Over-Voltage Comparators (FB Pin)

VREF

FB regulation threshold

SS pin = steady state

2.440

2.5

2.550

V

FB over-voltage threshold

2.9

V

FB bias current

FB = 3V

1

nA

(1)

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

(2)

VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading

4

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