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參數資料
| 型號： | LM3075MTCX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | High Efficiency, Synchronous Current Mode Buck Controller |
| 中文描述： | SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數： | 4/18頁 |
| 文件大小： | 857K |
| 代理商： | LM3075MTCX |
Electrical Characteristics
Limits in standard type are for T
J
= 25C only, and limits in
boldface type
apply
over the junction temperature T
range of -40C to +125C. Minimum and Maximum limits are guaranteed through test, design,
or statistical correlation. Typical values represent the most likely parametric norm at T
J
= 25C, and are provided for reference
purposes only. Unless otherwise specified V
IN
= 12V. (Continued)
Symbol
I
CBOOT
R
ds_on 1
Parameter
Conditions
Min
Typ
10
2.9
Max
Unit
nA
C
BOOT
Leakage Current
HDRV FET driver pull-up
On resistance
HDRV FET driver pull-down
On resistance
LDRV FET driver pull-up On
resistance
LDRV FET driver pull-down
On resistance
V
CBOOT
= 7V
R
ds_on 2
1.7
R
ds_on 3
2.4
R
ds_on 4
0.8
OSCILLATOR
f
OSC
Oscillator Frequency
V
FS
= 5V
V
FS
= 0V
V
FB
= 1V
255
165
95.5
300
200
98
180
330
215
kHz
D
MAX
T
ON_MIN
Maximum Dutycycle
Minimum On Time
%
ns
260
ERROR AMPLIFIER
I
FB
I
COMP_SRC
Feedback pin bias current
COMP Output Source
Current
COMP Output Sink Current
V
FB
= 1.5V
V
FB
= 1V
V
COMP
= 1V
V
FB
= 1.5V
V
COMP
= 0.5V
50
120
nA
μA
I
COMP_SNK
110
μA
Gm
Error Amplifier
Transconductance
Error Amplifier Voltage Gain
Slope Compensation
(referred to the internal
summing node)
Current Sense Amplifier
Gain
620
μmho
A
VOL
V
SL
1250
0.051
V/V
V/μs
V
FS
= 0V
V
FS
= 5V
0.076
A
CS
V
COMP
= 1.25V
4
5
6
V/V
LOGIC
V
IL
FS, /FPWM Pin Maximum
Low Level Input Level
FS, /FPWM Pin Minimum
High Level Input Level
0.8
V
V
IH
2
V
THERMAL SHUTDOWN
T
SD
T
SD_HYS
Thermal Shutdown
Thermal Shutdown
Hysteresis
160
10
C
C
EXT
R
EXT
EXT pin on resistance
V
EXT
= 5V
I
VLIN5
= 50 mA
4
TH
EXT
VLIN5 to EXT Switch Over
Rising Threshold
4.6
V
L
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