參數(shù)資料
型號(hào)： LM5021NA-2/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 0.7 A SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDIP8
封裝： LEAD FREE, PLASTIC, DIP-8
文件頁(yè)數(shù)： 9/15頁(yè)
文件大小： 747K
代理商： LM5021NA-2/NOPB
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to GND
-0.3V to 30V
VIN Clamp Continuous Current
5mA
CS to GND
-0.3V to 1.25V
RT to GND
-0.3V to 5.5V
All other pins to GND
-0.3V to 7.0V
ESD Rating (Note 2)
Human Body Model
2kV
Storage Temperature
-65C to +150C
Operating Junction Temperature
+150C
Operating Ratings (Note 1)
VIN Voltage (Note 5)
8V to 30V
Junction Temperature
-40C to +125C
Electrical Characteristics Specifications in standard type face are for T
J= +25C and those in boldface
type apply over the full Operating Junction Temperature Range. Unless otherwise specified: V
IN = 15V, RT = 44.2K
.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
STARTUP CIRCUIT
Start Up Current
Before VCC Enable
18
25
A
VCC Regulator enable threshold
17
20
23
V
VCC Regulator disable
threshold
7.25
V
VIN ESD Clamp voltage
I = 5mA
30
36
40
V
I
VIN
Operating supply current
COMP = 0VDC
2.5
3.75
mA
VCC SUPPLY
Controller enable threshold
6.5
7
7.5
V
Controller disable threshold
5.3
5.8
6.3
V
VCC regulated output
No External Load
8
8.5
9
V
VCC dropout voltage (VIN -
VCC)
I=5mA
1.7
V
VCC regulator current limit
VCC = 7.5V (Note
15
22
mA
SKIP CYCLE MODE COMPARATOR
Skip Cycle mode enable
threshold
1
3 [COMP - 1.25V]
75
125
175
mV
Skip Cycle mode hysteresis
5
mV
CURRENT LIMIT
CS limit to OUT delay
CS stepped from 0
to 0.6V, time to OUT
transition low, C
load
=0.
35
ns
CS limit threshold
0.45
0.5
0.55
V
Leading Edge Blanking time
90
ns
CS blanking sinking impedance
35
55
SOFT-START
V
SS-OCV
SS pin open-circuit voltage
4.3
5.2
6.1
V
Soft-start Current Source
15
22
30
A
Soft-start to COMP Offset
0.35
0.55
0.75
V
COMP sinking impedance
During SS ramp
60
OSCILLATOR
Frequency1 (RT = 44.2K)
135
150
165
kHz
Frequency2 (RT = 13.3K)
440
500
560
kHz
Sync threshold
2.4
3.2
3.8
V
LM5021
www.national.com
3
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