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参数资料
| 型号： | LM3431SDX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, QCC28 |
| 封装： | LLP-28 |
| 文件页数： | 19/24页 |
| 文件大小： | 549K |
| 代理商： | LM3431SDX |
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 SGND:
VIN
-0.3V to 37V
EN
-0.3V to 10V
DIM
-0.3V to 7V
MODE/F
-0.3V to 7V
REFIN
-0.3V to 7V
THM
-0.3V to 7V
DLY
-0.3V to 7V
SNSx
-0.3V to 7V
NDRVx
-0.3V to 7V
CFB
-0.3V to 7V
SC
-0.3V to 40V
AFB
-0.3V to 7V
CS
-0.3V to 7V
VCC
-0.3V to 7V
Storage Temperature
-65°C to +150°C
Soldering Dwell Time, Temp.
Infrared
20sec, 240°C
Vapor Phase
75sec, 219°C
ESD Rating (Note 2)
Human Body Model
2 kV
Operating Ratings (Note 1)
VIN
4.5V to 36V
Junction Temp. Range
-40°C to +125°C
Thermal Resistance (
θ
JA)
(Note 3)
TSSOP-28 (0.5W)
32°C/W
LLP-28 (0.5W)
31°C/W
Power Dissipation (Note 4)
TSSOP-28
3.1W
LLP-28
3.2W
Electrical Characteristics Specifications in standard type are for TJ = 25°C only, and limits in boldface type
apply over the junction temperature (TJ) range of -40°C to +125°C. Unless otherwise stated, V
IN = 12V. Minimum and Maximum
limits are guaranteed 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. (Note 5)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
System
I
Q
Operating VIN Current (Note 6)
DIM = 5V
4.0
4.85
mA
I
Q_SB
Standby mode VIN current
EN = 1V
3.7
mA
I
Q_SD
Shutdown mode VIN Current
EN = 0V, Vin = 36V
15
23
uA
V
CC
VCC voltage
Iload = 25 mA, Vin = 5.5 to 36V
4.80
5
5.24
V
VCC
ILIM
VCC current limit
72
mA
UVLO
UVLO threshold
VIN rising, measured at VCC
4.36
4.50
V
hysteresis
0.28
V
EN_ST
Enable pin Standby threshold
EN rising
0.75
V
EN
Enable pin On threshold
EN rising
1.185
1.230
1.275
V
hysteresis
115
165
mV
Linear Current Controller
V
REF
Reference Voltage
IREF < 300 A
2.45
2.5
2.55
V
I
REFIN
REFIN input bias current
REFIN = 300 mV
14
80
nA
ΔV
REF / ΔVIN
Line regulation
5.5V < VIN < 36V
0.0001
%/V
V
NDRV
NDRVx drive voltage capability
INDRVx = 5 mA
3.7
V
I
NDRV_SK
NDRVx drive sink current
NDRV
X = 0.9V
4
6
8
mA
I
NDRV_SC
NDRVx drive source current
NDRV
X = 0.9V
10
15
20
mA
I
SNS
SNSx input bias current
SNSx = 300 mV
20
30
A
V
OS
SNSx amp offset voltage
REFIN = 300 mV
-5
+5
mV
V
OS_DELTA
Ch. To Ch. offset voltage mismatch
(Note 7)
REFIN = 300 mV, 25°C
5.5
mV
V
OS_DELTA
Ch. To Ch. offset voltage mismatch
(Note 7)
REFIN = 300 mV, -40°C to +125°C
6
mV
bw
SNSx amp bandwidth
At unity gain
2
MHz
V
LEDOFF
LEDOFF voltage
DIM low
5
V
www.national.com
4
LM3431
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