LM34922

SNVS813A – JUNE 2012 – REVISED MARCH 2013

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Electrical Charateristics (continued)

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, RT = 50kΩ.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VILIM

Threshold voltage at CS

-146

-130

-115

mV

CS bias current

FB = 3V

-120

µA

CSG bias current

FB = 3V

-35

µA

On Timer, RT Pin

tON - 1

On-time

VIN = 12V, RT = 50kΩ

150

200

250

ns

tON - 2

On-time (current limit)

VIN = 12V, RT = 50kΩ

100

ns

tON - 3

On-time

VIN = 12V, RT = 301kΩ

1020

ns

tON - 4

On-time

VIN = 9V, RT = 30.9kΩ

130

171

215

ns

tON - 5

On-time

VIN = 12V, RT = 30.9kΩ

105

137

170

ns

tON - 6

On-time

VIN = 16V, RT = 30.9kΩ

79

109

142

ns

Off Timer

tOFF

Minimum Off-time (LM34922)

90

150

208

ns

Regulation Comparator (FB Pin)

VREF

FB regulation threshold

SS pin = steady state

2.46

2.51

2.56

V

FB bias current

FB = 3V

100

nA

Power Good (PGD pin)

Threshold at FB, with respect to VREF

FB increasing

91

95

%

Threshold hysteresis

3.3

%

PGDVOL

Low state voltage

IPGD = 1mA, FB = 0V

125

180

mV

PGDLKG

Off state leakage

VPGD = 7V, FB = 3V

0.1

µA

Thermal Shutdown

TSD

Thermal shutdown

Junction temperature increasing

155

°C

Thermal shutdown hysteresis

20

°C

Thermal Resistance

θJA

Junction to Ambient, 0 LFPM Air Flow (1)

48

°C/W

θJC

Junction to Case,(1)

10

°C/W

(1)

JEDEC test board description can be found in JESD 51-5 and JESD 51-7.

4

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