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參數資料
| 型號： | LM2599T-ADJ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features |
| 中文描述： | 7.5 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, PZFM7 |
| 封裝： | TO-220, 7 PIN |
| 文件頁數： | 4/31頁 |
| 文件大?。?/td> | 812K |
| 代理商： | LM2599T-ADJ |
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All Output Voltage Versions
Electrical Characteristics
(Continued)
Specifications with standard type face are for T
= 25C, and those with
boldface type
apply over
full Operating Tempera-
ture Range
. Unless otherwise specified, V
IN
= 12V for the 3.3V, 5V, and Adjustable version and V
IN
= 24V for the 12V ver-
sion. I
LOAD
= 500 mA
Symbol
Parameter
Conditions
LM2599-XX
Typ
(Note
4)
Units
(Limits)
Limit
(Note 5)
DEVICE PARAMETERS
I
STBY
Standby Quiescent
Current
θ
JC
Thermal Resistance
θ
JA
θ
JA
θ
JA
θ
JA
SHUTDOWN/SOFT-START CONTROL
Test Circuit of Figure 1
V
SD
Shutdown Threshold
Voltage
SD /SS pin = 0V
(Note 11)
80
μA
200/
250
μA(max)
C/W
C/W
C/W
C/W
C/W
TO220 or TO263 Package, Junction to Case
TO220 Package, Juncton to Ambient (Note 12)
TO263 Package, Juncton to Ambient (Note 13)
TO263 Package, Juncton to Ambient (Note 14)
TO263 Package, Juncton to Ambient (Note 15)
2
50
50
30
20
1.3
V
Low, (Shutdown Mode)
High, (Soft-start Mode)
V
OUT
= 20% of Nominal Output Voltage
V
OUT
= 100% of Nominal Output Voltage
V
SHUTDOWN
= 0.5V
0.6
2
V(max)
V(min)
V
V
SS
Soft-start Voltage
2
3
5
I
SD
Shutdown Current
μA
10
μA(max)
μA
μA(max)
I
SS
Soft-start Current
V
Soft-start
= 2.5V
1.6
5
FLAG/DELAY CONTROL
Test Circuit of Figure 1
Regulator Dropout Detector
Threshold Voltage
Low (Flag ON)
96
%
92
98
%(min)
%(max)
V
V(max)
μA
V
V(min)
V(max)
μA
μA(max)
mV
mV(max)
VF
SAT
Flag Output Saturation
Voltage
Flag Output Leakage Current
Delay Pin Threshold
Voltage
I
SINK
= 3 mA
V
DELAY
= 0.5V
V
FLAG
= 40V
0.3
0.7/
1.0
IF
L
0.3
1.25
Low (Flag ON)
High (Flag OFF) and V
OUT
Regulated
V
DELAY
= 0.5V
1.21
1.29
Delay Pin Source Current
3
6
Delay Pin Saturation
Low (Flag ON)
55
350/
400
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2:
Voltage internally clamped. If clamp voltage is exceeded, limit current to a maximum of 1 mA.
Note 3:
The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.
Note 4:
Typical numbers are at 25C and represent the most likely norm.
Note 5:
All limits guaranteed at room temperature (standard type face) and at
temperature extremes (bold type face)
. All room temperature limits are 100% pro-
duction tested. All limits at
temperature extremes
are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to cal-
culate Average Outgoing Quality Level (AOQL).
Note 6:
External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2599
is used as shown in the Figure 1 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics.
Note 7:
The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of current over-
load.
Note 8:
No diode, inductor or capacitor connected to output pin.
Note 9:
Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
L
www.national.com
4
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