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LM1577 Arkusz danych(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części LM1577
Szczegółowy opis  SIMPLE SWITCHER Step-Up Voltage Regulator
PDF  27 Pages
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1577 Arkusz danych(HTML) 5 Page - National Semiconductor (TI)

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Electrical Characteristics — LM1577-ADJ, LM2577-ADJ
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, VFEEDBACK = VREF, and ISWITCH = 0.
LM1577-ADJ LM2577-ADJ
Units
Symbol
Parameter
Conditions
Typical
Limit
Limit
(Limits)
(Notes 3, 4)
(Note 5)
SYSTEM PARAMETERS Circuit of
Figure 3 (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)
∆V
OUT/
Line Regulation
V
IN = 3.5V to 10V
20
mV
∆V
IN
I
LOAD = 300 mA
50/100
50/100
mV(max)
∆V
OUT/
Load Regulation
V
IN = 5V
20
mV
∆I
LOAD
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 = 1.5V (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
Reference
Measured at Feedback Pin
V
Voltage
V
IN = 3.5V to 40V
1.230
1.214/1.206
1.214/1.206
V(min)
V
COMP = 1.0V
1.246/1.254
1.246/1.254
V(max)
∆V
REF/
Reference Voltage
V
IN = 3.5V to 40V
0.5
mV
∆V
IN
Line Regulation
I
B
Error Amp
V
COMP = 1.0V
100
nA
Input Bias Current
300/800
300/800
nA(max)
G
M
Error Amp
I
COMP = −30 µA to +30 µA
3700
µmho
Transconductance
V
COMP = 1.0V
2400/1600
2400/1600
µmho(min)
4800/5800
4800/5800
µmho(max)
A
VOL
Error Amp
V
COMP = 1.1V to 1.9V
800
V/V
Voltage Gain
R
COMP = 1.0 MΩ (Note 7)
500/250
500/250
V/V(min)
Error Amplifier
Upper Limit
2.4
V
Output Swing
V
FEEDBACK = 1.0V
2.2/2.0
2.2/2.0
V(min)
Lower Limit
0.3
V
V
FEEDBACK = 1.5V
0.40/0.55
0.40/0.55
V(max)
Error Amp
V
FEEDBACK = 1.0V to 1.5V
±200
µA
Output Current
V
COMP = 1.0V
±130/±90
±130/±90
µA(min)
±300/±400
±300/±400
µA(max)
I
SS
Soft Start Current
V
FEEDBACK = 1.0V
5.0
µA
V
COMP = 0V
2.5/1.5
2.5/1.5
µA(min)
7.5/9.5
7.5/9.5
µA(max)
D
Maximum Duty Cycle
V
COMP = 1.5V
95
%
I
SWITCH = 100 mA
93/90
93/90
%(min)
∆I
SWITCH/
Switch
12.5
A/V
∆V
COMP
Transconductance
www.national.com
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