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參數(shù)資料
| 型號： | LM2591 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator |
| 中文描述： | SIMPLE SWITCHER系列電源轉(zhuǎn)換器150千赫1A步降穩(wěn)壓器 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 730K |
| 代理商： | LM2591 |
All Output Voltage Versions
Electrical Characteristics
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. I
LOAD
= 500 mA
Symbol
Parameter
Conditions
LM2591HV-XX
Typ
(Note 3)
Units
(Limits)
Limit
(Note 4)
DEVICE PARAMETERS
I
b
Feedback Bias Current
Adjustable Version Only, V
FB
= 1.3V
10
nA
50/
100
nA (max)
kHz
kHz(min)
kHz(max)
V
V(max)
%
f
O
Oscillator Frequency
(Note 6)
150
127/
110
173/
173
V
SAT
Saturation Voltage
I
OUT
= 1A (Note 7) (Note 8)
0.95
1.2/
1.3
DC
Max Duty Cycle (ON)
Min Duty Cycle (OFF)
Switch current Limit
(Note 8)
(Note 9)
Peak Current, (Note 7) (Note 8)
100
0
1.9
I
CLIM
A
1.3/
1.2
2.8/
3.0
50
A(min)
A(max)
μA(max)
mA
mA(max)
mA
mA(max)
μA
μA(max)
C/W
C/W
C/W
C/W
C/W
I
L
Output Leakage Current
(Note 7) (Note 9) (Note 10)
Output = 0V
Output = 1V
5
30
I
Q
Operating Quiescent
Current
Standby Quiescent
Current
Thermal Resistance
SD /SS Pin Open (Note 9)
5
10
I
STBY
SD /SS pin = 0V
(Note 10)
90
200/
250
θ
JC
θ
JA
θ
JA
θ
JA
θ
JA
ON/OFF CONTROL
Test Circuit
Figure 1
ON /OFF Pin Logic Input
V
IH
Threshold Voltage
V
IL
I
H
ON /OFF Pin Input Current
TO220 or TO263 Package, Junction to Case
TO220 Package, Juncton to Ambient (Note 11)
TO263 Package, Juncton to Ambient (Note 12)
TO263 Package, Juncton to Ambient (Note 13)
TO263 Package, Juncton to Ambient (Note 14)
2
50
50
30
20
1.3
V
Low (Regulator ON)
High (Regulator OFF)
V
LOGIC
= 2.5V (Regulator OFF)
0.6
2.0
V(max)
V(min)
μA
μA(max)
μA
μA(max)
5
15
I
L
V
LOGIC
= 0.5V (Regulator ON)
0.02
5
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2:
The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.
Note 3:
Typical numbers are at 25C and represent the most likely norm.
Note 4:
All limits guaranteed at room temperature (standard type face) and at
temperature extremes (bold type face)
. All room temperature limits are 100%
production tested. All limits at
temperature extremes
are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used
to calculate Average Outgoing Quality Level (AOQL).
Note 5:
External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the
LM2591HV is used as shown in the
Figure 1
test circuit, system performance will be as shown in system parameters section of Electrical Characteristics.
Note 6:
The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of current
overload.
Note 7:
No diode, inductor or capacitor connected to output pin.
Note 8:
Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 9:
Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version to force the output transistor switch OFF.
Note 10:
V
IN
= 60V.
L
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