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參數(shù)資料
| 型號(hào)： | LM2696 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 3A, Constant On Time Buck Regulator |
| 中文描述： | 第3A，恒定時(shí)間降壓穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 3/19頁(yè) |
| 文件大小： | 833K |
| 代理商： | LM2696 |
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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
AVIN
PVIN
CBOOT
CBOOT to SW
FB, SD, SS, PGOOD
Storage Temperature Range
0.3V to +26V
0.3V to (AV
IN
+0.3V)
0.3V to +33V
0.3V to +7V
0.3V to +7V
65C to +150C
Junction Temperature
Lead Temperature
(Soldering, 10 sec.)
Minimum ESD Rating
+150C
260C
1.5 kV
Operating Range
Junction
Temperature
AVIN to GND
PVIN
40C to +125C
4.5V to 24V
4.5V to 24V
Electrical Characteristics
type apply over the full
Operating Temperature Range
(T
J
= 40C to +125C). Minimum and Maximum limits are guaran-
teed 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.
Specifications with standard typeface are for T
J
= 25C, and those in
boldface
Symbol
V
FB
Parameter
Condition
Min
Typ
Max
Units
Feedback Pin Voltage
V
IN
= 4.5V to 24V
I
SW
= 0A to 3A
V
CBOOT
= V
SW
+ 5V
I
SW
= 3A
V
FB
= 1.5V
Rising V
IN
1.225
1.254
1.282
V
I
CL
R
DS_ON
I
Q
V
UVLO
V
UVLO HYS
I
SD
k
ON
V
D ON
T
OFF_MIN
Switch Current Limit
Switch On Resistance
Operating Quiescent Current
AVIN Under Voltage Lockout
AVIN Under Voltage Lockout Hysteresis
Shutdown Quiescent Current
Switch On-Time Constant
R
ON
Voltage
Minimum Off Time
3.6
4.9
0.13
1.3
4.125
60
12
66
0.65
165
12
6.4
0.22
2
4.3
120
25
82
0.95
250
30
A
mA
V
mV
μA
μA μs
V
ns
μs
ns
V
%
3.9
V
SD
= 0V
I
ON
= 50 μA to 100 μA
50
0.35
FB = 1.24V
FB = 0V
T
ON MIN
V
EXTV
CC
V
EXTV
CC
V
PWRGD
Minimum On-time
EXTV
CC
Voltage
EXTV
CC
Load Regulation
PGOOD Threshold (PGOOD Transition
from Low to High)
PGOOD Hysteresis
PGOOD Low Sink Current
PGOOD High Leakage Current
Feedback Pin Bias Current
Soft-Start Pin Source Current
Soft-Start Pin Sink Current
400
3.30
3.65
0.03
4.00
0.5
I
EXTV
CC
= 0 μA to 50 μA
With respect to V
FB
91.5
93.5
95.5
%
V
PG_HYS
I
OL
I
OH
I
FB
I
SS_SOURCE
I
SS SINK
1
2
50
0
1
2.1
%
mA
nA
nA
μA
V
PGOOD
= 0.4V
0.5
V
FB
= 1.2V
V
SS
= 0V
V
SS
= 1.2V
V
SD
= 0V
V
SD
= 0V
0.7
1.4
15
mA
I
SD
V
IH
V
IL
θ
J-A
Shutdown Pull-Up Current
SD Pin Minimum High Input Level
SD Pin Maximum Low Input Level
Thermal Resistance
1
3
μA
V
V
C/W
1.8
0.6
35.1
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage may occur to the device. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see Electrical Characteristics.
Note 2:
Without PCB copper enhancements. The maximum power dissipation must be derated at elevated temperatures and is limited by T
(maximum junction
temperature),
θ
(junction to ambient thermal resistance) and T
(ambient temperature). The maximum power dissipation at any temperature is: P
DissMAX
= (T
JMAX
- T
A
) /
θ
J-A
up to the value listed in the Absolute Maximum Ratings.
θ
J-A
for TSSOP-16 package is 38.1C/W, T
JMAX
= 125C.
L
www.national.com
3
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