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LM1577 데이터시트(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 LM1577
상세설명  SIMPLE SWITCHER짰 Step-Up Voltage Regulator
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
45V
Output Switch Voltage
65V
Output Switch Current (Note 2)
6.0A
Power Dissipation
Internally Limited
Storage Temperature Range
−65˚C to +150˚C
Lead Temperature
(Soldering, 10 sec.)
260˚C
Maximum Junction Temperature
150˚C
Minimum ESD Rating
(C = 100 pF, R = 1.5 k
Ω)2 kV
Operating Ratings
Supply Voltage
3.5V
≤ V
IN
≤ 40V
Output Switch Voltage
0V
≤ V
SWITCH
≤ 60V
Output Switch Current
I
SWITCH
≤ 3.0A
Junction Temperature Range
LM1577
−55˚C
≤ T
J
≤ +150˚C
LM2577
−40˚C
≤ T
J
≤ +125˚C
Electrical Characteristics—LM1577-12, LM2577-12
Specifications with standard type face are for T
J = 25˚C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, V
IN = 5V, and ISWITCH =0.
LM1577-12
LM2577-12
Units
Symbol
Parameter
Conditions
Typical
Limit
Limit
(Limits)
(Notes 3, 4)
(Note 5)
SYSTEM PARAMETERS Circuit of Figure 1 (Note 6)
V
OUT
Output Voltage
V
IN = 5V to 10V
12.0
V
I
LOAD = 100 mA to 800 mA
11.60/11.40
11.60/11.40
V(min)
(Note 3)
12.40/12.60
12.40/12.60
V(max)
Line Regulation
V
IN = 3.5V to 10V
20
mV
I
LOAD = 300 mA
50/100
50/100
mV(max)
Load Regulation
V
IN =5V
20
mV
I
LOAD = 100 mA to 800 mA
50/100
50/100
mV(max)
η
Efficiency
V
IN = 5V, ILOAD = 800 mA
80
%
DEVICE PARAMETERS
I
S
Input Supply Current
V
FEEDBACK = 14V (Switch Off)
7.5
mA
10.0/14.0
10.0/14.0
mA(max)
I
SWITCH = 2.0A
25
mA
V
COMP = 2.0V (Max Duty Cycle)
50/85
50/85
mA(max)
V
UV
Input Supply
I
SWITCH = 100 mA
2.90
V
Undervoltage Lockout
2.70/2.65
2.70/2.65
V(min)
3.10/3.15
3.10/3.15
V(max)
f
O
Oscillator Frequency
Measured at Switch Pin
52
kHz
I
SWITCH = 100 mA
48/42
48/42
kHz(min)
56/62
56/62
kHz(max)
V
REF
Output Reference
Measured at Feedback Pin
V
Voltage
V
IN = 3.5V to 40V
12
11.76/11.64
11.76/11.64
V(min)
V
COMP = 1.0V
12.24/12.36
12.24/12.36
V(max)
Output Reference
V
IN = 3.5V to 40V
7mV
Voltage Line Regulator
R
FB
Feedback Pin Input
9.7
k
Resistance
G
M
Error Amp
I
COMP = −30 µA to +30 µA
370
µmho
Transconductance
V
COMP = 1.0V
225/145
225/145
µmho(min)
515/615
515/615
µmho(max)
www.national.com
4


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