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LM34922 데이터시트(PDF) 4 Page - Texas Instruments

부품명 LM34922
상세설명  28V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit
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홈페이지  http://www.ti.com
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LM34922 데이터시트(HTML) 4 Page - Texas Instruments

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LM34922
SNVS813A – JUNE 2012 – REVISED MARCH 2013
www.ti.com
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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Product Folder Links: LM34922


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