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參數(shù)資料
| 型號(hào)： | LM1577K-883 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | SIMPLE SWITCHER-R Step-Up Voltage Regulator |
| 中文描述： | SIMPLE SWITCHER系列- R的升壓穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 5/27頁(yè) |
| 文件大小： | 870K |
| 代理商： | LM1577K-883 |
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Electrical Characteristics—LM1577-ADJ, LM2577-ADJ
Specifications with standard type face are for T
J
= 25C, and those in
bold type face
apply over full
Operating Temperature
Range
. Unless otherwise specified, V
IN
= 5V, V
FEEDBACK
= V
REF
, and I
SWITCH
= 0.
LM1577-ADJ LM2577-ADJ
Limit
(Notes 3, 4)
Units
(Limits)
Symbol
Parameter
Conditions
Typical
Limit
(Note 5)
SYSTEM PARAMETERS
Circuit of Figure 3 (Note 6)
V
OUT
Output Voltage
V
IN
= 5V to 10V
I
LOAD
= 100 mA to 800 mA
(Note 3)
V
IN
= 3.5V to 10V
I
LOAD
= 300 mA
V
IN
= 5V
I
LOAD
= 100 mA to 800 mA
V
IN
= 5V, I
LOAD
= 800 mA
12.0
V
11.60/
11.40
12.40/
12.60
11.60/
11.40
12.40/
12.60
V(min)
V(max)
mV
mV(max)
mV
mV(max)
%
V
OUT
/
V
IN
V
OUT
/
I
LOAD
η
DEVICE PARAMETERS
I
S
Line Regulation
20
50/
100
50/
100
Load Regulation
20
50/
100
50/
100
Efficiency
80
Input Supply Current
V
FEEDBACK
= 1.5V (Switch Off)
7.5
mA
10.0/
14.0
10.0/
14.0
mA(max)
mA
mA(max)
V
V(min)
V(max)
kHz
kHz(min)
kHz(max)
V
V(min)
V(max)
mV
I
SWITCH
= 2.0A
V
COMP
= 2.0V (Max Duty Cycle)
I
SWITCH
= 100 mA
25
50/
85
50/
85
V
UV
Input Supply
Undervoltage Lockout
2.90
2.70/
2.65
3.10/
3.15
2.70/
2.65
3.10/
3.15
f
O
Oscillator Frequency
Measured at Switch Pin
I
SWITCH
= 100 mA
52
48/
42
56/
62
48/
42
56/
62
V
REF
Reference
Voltage
Measured at Feedback Pin
V
IN
= 3.5V to 40V
V
COMP
= 1.0V
V
IN
= 3.5V to 40V
1.230
1.214/
1.206
1.246/
1.254
1.214/
1.206
1.246/
1.254
V
REF
/
V
IN
I
B
Reference Voltage
Line Regulation
Error Amp
Input Bias Current
Error Amp
Transconductance
0.5
V
COMP
= 1.0V
100
nA
300/
800
300/
800
nA(max)
μmho
μmho(min)
μmho(max)
V/V
V/V(min)
V
V(min)
V
V(max)
μA
μA(min)
μA(max)
μA
μA(min)
μA(max)
%
%(min)
A/V
G
M
I
COMP
= 30 μA to +30 μA
V
COMP
= 1.0V
3700
2400/
1600
4800/
5800
2400/
1600
4800/
5800
A
VOL
Error Amp
Voltage Gain
Error Amplifier
Output Swing
V
COMP
= 1.1V to 1.9V
R
COMP
= 1.0 M
(Note 7)
Upper Limit
V
FEEDBACK
= 1.0V
Lower Limit
V
FEEDBACK
= 1.5V
V
FEEDBACK
= 1.0V to 1.5V
V
COMP
= 1.0V
800
500/
250
500/
250
2.4
2.2/
2.0
2.2/
2.0
0.3
0.40/
0.55
0.40/
0.55
Error Amp
Output Current
±
200
±
130/
±
90
±
300/
±
400
±
130/
±
90
±
300/
±
400
I
SS
Soft Start Current
V
FEEDBACK
= 1.0V
V
COMP
= 0V
5.0
2.5/
1.5
7.5/
9.5
2.5/
1.5
7.5/
9.5
D
Maximum Duty Cycle
V
COMP
= 1.5V
I
SWITCH
= 100 mA
95
93/
90
93/
90
I
SWITCH
/
V
COMP
Switch
Transconductance
12.5
www.national.com
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