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參數資料
| 型號： | LM3075 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | High Efficiency, Synchronous Current Mode Buck Controller |
| 中文描述： | 高效率，電流模式同步降壓控制器 |
| 文件頁數： | 3/18頁 |
| 文件大小： | 857K |
| 代理商： | LM3075 |
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Voltages from the indicated pins to GND:
VIN, ILIM, CSH
SW, CSL
PGOOD, FB, VDD, EXT, EN
COMP, SS, FPWM, FS
0.3V to 38V
0.3 to (V
IN
+ 0.3V)
0.3V to +7V
0.3V to (V
LIN5
+0.3)V
CBOOT
CBOOT to SW
LDRV
-0.3V to +43V
0.3V to 7V
0.3V to (V
DD
+0.3V)
HDRV to SW
HDRV to CBOOT
Storage Temperature Range
Junction Temperature
Lead Temperature (Soldering, 10
sec)
ESD Rating (Note 2)
0.3V
+0.3V
65C to +150C
150C
260C
1.5kV
Operating Ratings
(Note 1)
Junction Temperature
VIN to GND
EXT
40C to +125C
4.5V to 36V
6V Max
Electrical Characteristics
over the junction temperature T
J
range of -40C to +125C. Minimum and Maximum limits are guaranteed through test, de-
sign, or statistical correlation. Typical values represent the most likely parametric norm at T
J
= 25C, and are provided for ref-
erence purposes only. Unless otherwise specified V
IN
= 12V.
Limits in standard type are for T
J
= 25C only, and limits in
boldface type
apply
Symbol
V
FB
Parameter
Conditions
Min
1.213
Typ
1.238
0.04
Max
1.259
Unit
V
%
Feedback pin voltage
Load Regulation
V
IN
= 4.5V to 36V
V
COMP
= 0.5V to 1.5V
Line Regulation
V
IN
= 4.5V to 36V
0.04
%
I
Q
I
SD
V
LIN5
Operating Quiescent current V
IN
= 4.5V to 36V
Shutdown Quiescent current V
EN
= 0V
V
LIN5
Output Voltage
1.0
60
2
mA
μA
V
100
I
VLIN5
= 0 to 25mA
V
IN
= 5.5V to 36V
4.7
3.7
5
5.3
4.1
V
UVLO
V
LIN5
Under Voltage
Lockout
V
LIN5
Under Voltage
Lockout Hysteresis
Current Limit Comparator
Offset
(V
ILIM
– V
CSL
)
I
LIM
sink current
Soft-Start Pin Source
Current
Soft-Start Pin Sink Current
Soft-Start Timeout
Threshold
Over Voltage Protection
Rising Threshold
Over Voltage Protection
Hysteresis
3.9
V
V
UVLO_HYS
0.2
V
V
CL_OS
±
0.2
mV
I
ILIM
I
SS_SRC
8.3
1
10
2
11.3
3
μA
μA
V
SS
= 1.2V
I
SS_SNK
V
SS_TO
V
SS
= 2V
4
2
μA
V
V
OVP
With respect to V
FB
105
111
117
%
V
OVP_HYS
With respect to V
FB
2.8
%
POWERGOOD
V
PWR_GOOD
V
PWR_BAD
T
PGOOD
PGOOD Rising Threshold
PGOOD Falling Threshold
PGOOD delay
PGOOD Low Sink Current
PGOOD High Leakage
Current
92.5
87
95.5
90.5
10
1
5
98.5
95
%
%
μs
mA
nA
PGOOD pin de-asserting
V
PGOOD
= 0.4V
V
PGOOD
= 5V
I
OL
I
OH
0.6
200
GATE DRIVE
L
www.national.com
3
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