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LM34917A 데이터시트(PDF) 4 Page - Texas Instruments

부품명 LM34917A
상세설명  Ultra Small 33V, 1.25A Constant On-Time Buck Switching Regulator with Intelligent Current Limit
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홈페이지  http://www.ti.com
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LM34917A 데이터시트(HTML) 4 Page - Texas Instruments

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LM34917A
SNOSAX7D – DECEMBER 2007 – REVISED MARCH 2013
www.ti.com
Electrical Characteristics (continued)
Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the 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, RON = 200kΩ. See
(1) and (2).
Symbol
Parameter
Conditions
Min
Typ
Max
Units
UVLOGD hysteresis
450
mV
Softstart Pin
VSS
Pull-up voltage
2.5
V
ISS
Internal current source
11.6
µA
VRES
Restart threshold after OVP
0.18
V
shutdown
Current Limit
ILIM
Threshold
VIN = 8V, VFB = 2.4V
1.15
1.35
1.55
A
VIN = 30V, VFB = 2.4V
1.05
1.2
1.45
VIN = 30V, VFB = 1.0V
0.95
1.15
1.35
Response time
150
ns
On Timer
tON - 1
On-time (normal operation)
VIN = 10V, RON = 200 kΩ
2.1
2.8
3.5
µs
tON - 2
On-time (normal operation)
VIN = 32V, RON = 200 kΩ
860
ns
tON - 3
On-time (current limit)
VIN = 10V, RON = 200 kΩ
1.13
µs
Shutdown threshold at RON/SD
Voltage at RON/SD rising
0.3
0.65
1.0
V
Shutdown Threshold hysteresis
Voltage at RON/SD falling
40
mV
Off Timer
tOFF
Minimum Off-time
90
ns
Regulation and Over-Voltage Comparators (FB Pin)
VREF
FB regulation threshold
SS pin = steady state
2.445
2.50
2.550
V
FB over-voltage threshold
2.9
V
FB bias current
FB = 3V
10
nA
Input Over-Voltage Shutdown
VIN(OV)
Shutdown voltage threshold at
VIN increasing
33.0
34.8
36.9
V
VIN
Thermal Shutdown
TSD
Thermal shutdown temperature
Junction temperature rising
175
°C
Thermal shutdown hysteresis
20
°C
Thermal Resistance
θJA
Junction to Ambient
58
°C/W
0 LFPM Air Flow
4
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유사한 부품 번호 - LM34917A_15

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