參數(shù)資料
型號： LM2597M-12
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator, with Features
中文描述： 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, PDSO8
封裝： PLASTIC, SOIC-8
文件頁數(shù)： 4/34頁
文件大小： 900K
代理商： LM2597M-12
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 V
IN
= 24V for the 12V ver-
sion. I
LOAD
= 100 mA.
Symbol
Parameter
Conditions
LM2597/LM2597HV-XX
Typ
(Note 4)
Units
(Limits)
Limit
(Note 5)
DEVICE PARAMETERS
Current
I
STBY
Standby Quiescent
Current
10
mA(max)
μA
μA(max)
μA(max)
C/W
SD /SS pin = 0V
(Note 10)LM2597
85
200/
250
250/
300
LM2597HV
140
95
150
θ
JA
Thermal Resistance
N Package, Junction to Ambient (Note 12)
M Package, Junction to Ambient (Note 12)
SHUTDOWN/SOFT-START CONTROL
Test Circuit of Figure 12
V
SD
Shutdown Threshold
Voltage
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 12
Regulator Dropout
Detector
Threshold Voltage
VF
SAT
Flag Output Saturation
Voltage
IF
L
Flag Output Leakage
Current
Delay Pin Threshold
Voltage
Low (Flag ON)
96
%
92
98
%(min)
%(max)
V
V(max)
μA
I
SINK
= 3 mA
V
DELAY
= 0.5V
V
FLAG
= 40V
0.3
0.7/
1.0
0.3
1.25
V
Low (Flag ON)
High (Flag OFF) and V
OUT
Regulated
V
DELAY
= 0.5V
1.21
1.29
V(min)
V(max)
μA
μA(max)
mV
mV(max)
Delay Pin Source
Current
Delay Pin Saturation
3
6
Low (Flag ON)
55
350/
400
BIAS SUPPLY
I
BS
Bias Supply Pin Current
V
BS
= 2V
(Note 10)
120
μA
400
μA(max)
mA
mA(max)
mA
V
BS
= 4.4V (Note 10)
4
10
2
I
Q
Operating Quiescent
Current
V
BS
= 4.4V , V
in
pin current(Note 10)
1
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.
L
www.national.com
4
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參數(shù)描述
LM2597M-12/NOPB 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2597M-3.3 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2597M-3.3/NOPB 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2597M33 制造商:Texas Instruments 功能描述:SWITCHING REG 0.5A 3.3V SMD 2597
LM2597M-5.0 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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