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LM34930 Datasheet(PDF) 4 Page - Texas Instruments

Part # LM34930
Description  1A Constant On-Time Buck Switching Regulator with Intelligent Current
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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LM34930
SNVS571B – MAY 2008 – REVISED APRIL 2013
www.ti.com
Electrical Characteristics (continued)
Specifications with standard type are for TJ = 25°C only; limits in boldface type apply over the Operating Junction
Temperature (TJ) range of −40°C to + 125°C. 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 = 50 kΩ.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Current Limit
ILIM
Threshold
VIN = 8V
0.95
1.15
1.35
A
VIN = 30V
0.90
1.1
1.30
Resistance from ISEN to SGND
98
m
Over-Voltage Indicator
nOVTH
Threshold voltage at VIN
VIN increasing
17.5
19
20.0
V
nOVHYS
Threshold hysteresis
1.95
V
nOVVOL
Output low voltage
InoV = 1 mA, VIN = 22V
100
200
mV
nOVLKG
Off state leakage
VnoV = 7V
0.1
µA
On Timer
tON - 1
On-time
VIN = 10V, RT = 50 kΩ
190
292
430
ns
tON - 2
On-time
VIN = 33V, RT = 50 kΩ
127
ns
tON - 3
On-time (current limit)
VIN = 10V, RT = 50 kΩ
150
ns
Off Timer
tOFF
Minimum Off-time
90
ns
Regulation Comparator (FB Pin)
VREF
FB regulation threshold
SS Pin = steady state
2.470
2.52
2.575
V
FB bias current
1
nA
Input Over-voltage Shutdown
VIN(OV)
Threshold voltage at VIN
VIN increasing
34.0
36
38.3
V
VIN(OV)-HYS
Hysteresis
0.4
V
Thermal Shutdown
TSD
Thermal shutdown
TJ increasing
155
°C
Thermal shutdown hysteresis
20
°C
Thermal Resistance
θJA
Junction to Ambient
JEDEC 4 layer board(2)
65
°C/W
0 LFPM Air Flow
(2)
JEDEC test board description can be found in JESD 51-7.
4
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Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM34930


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