參數(shù)資料
型號： LM2597-3.3MWA
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC
封裝： WAFER
文件頁數(shù)： 34/40頁
文件大?。?/td> 1019K
代理商： LM2597-3.3MWA
All Output Voltage Versions
Electrical Characteristics (Continued)
Specifications with standard type face are for T
J = 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 VIN = 24V for the 12V ver-
sion. I
LOAD = 100 mA.
Symbol
Parameter
Conditions
LM2597/LM2597HV-XX
Units
(Limits)
Typ
Limit
(Note 4)
(Note 5)
DEVICE PARAMETERS
Current
10
mA(max)
I
STBY
Standby Quiescent
SD /SS pin = 0V
(Note 10)LM2597
85
A
Current
200/250
A(max)
LM2597HV
140
250/300
A(max)
θ
JA
Thermal Resistance
N Package, Junction to Ambient (Note 12)
95
C/W
M Package, Junction to Ambient (Note 12)
150
SHUTDOWN/SOFT-START CONTROL Test Circuit of
Figure 12
V
SD
Shutdown Threshold
1.3
V
Voltage
Low, (Shutdown Mode)
0.6
V(max)
High, (Soft-start Mode)
2
V(min)
V
SS
Soft-start Voltage
V
OUT = 20% of Nominal Output Voltage
2
V
OUT = 100% of Nominal Output Voltage
3
I
SD
Shutdown Current
V
SHUTDOWN = 0.5V
5A
10
A(max)
I
SS
Soft-start Current
V
Soft-start = 2.5V
1.6
A
5
A(max)
FLAG/DELAY CONTROL Test Circuit of
Figure 12
Regulator Dropout
Low (Flag ON)
96
%
Detector
92
%(min)
Threshold Voltage
98
%(max)
VF
SAT
Flag Output Saturation
I
SINK = 3 mA
0.3
V
Voltage
V
DELAY = 0.5V
0.7/1.0
V(max)
IF
L
Flag Output Leakage
Current
V
FLAG = 40V
0.3
A
Delay Pin Threshold
1.25
V
Voltage
Low (Flag ON)
1.21
V(min)
High (Flag OFF) and V
OUT Regulated
1.29
V(max)
Delay Pin Source
V
DELAY = 0.5V
3
A
Current
6
A(max)
Delay Pin Saturation
Low (Flag ON)
55
mV
350/400
mV(max)
BIAS SUPPLY
I
BS
Bias Supply Pin Current
V
BS = 2V
(Note 10)
120
A
400
A(max)
V
BS = 4.4V (Note 10)
4
mA
10
mA(max)
I
Q
Operating Quiescent
Current
V
BS = 4.4V , Vin pin current(Note 10)
1
2
mA
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: 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.
LM2597/LM2597HV
www.national.com
4
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