lm2577sx-adj National Semiconductor Corporation, lm2577sx-adj Datasheet - Page 7

• Manufacturer Part Number: lm2577sx-adj
• Description: Simple Switcher Step-up Voltage Regulator
• Manufacturer: National Semiconductor Corporation

DEVICE PARAMETERS
SYSTEM PARAMETERS Circuit of Figure 3 (Note 6)
V
∆V
∆V
∆V
∆I
η
DEVICE PARAMETERS
I
V
f
V
∆V
∆V
I
G
A
S
O
B
OUT
UV
REF
VOL
M
Electrical Characteristics—LM1577-15, LM2577-15
LOAD
Specifications with standard type face are for T
Range. Unless otherwise specified, V
Electrical Characteristics—LM1577-ADJ, LM2577-ADJ
Specifications with standard type face are for T
Range. Unless otherwise specified, V
Symbol
OUT
IN
OUT
REF
IN
Symbol
/
/
/
Output Voltage
Line Regulation
Load Regulation
Efficiency
Input Supply Current
Input Supply
Undervoltage Lockout
Oscillator Frequency
Reference
Voltage
Reference Voltage
Line Regulation
Error Amp
Input Bias Current
Error Amp
Transconductance
Error Amp
Voltage Gain
NPN Switch
Current Limit
Parameter
Parameter
V
I
(Note 3)
V
I
V
I
V
V
I
V
I
Measured at Switch Pin
I
Measured at Feedback Pin
V
V
V
V
I
V
V
R
IN
IN
LOAD
LOAD
LOAD
SWITCH
SWITCH
SWITCH
COMP
IN
IN
IN
IN
FEEDBACK
COMP
IN
COMP
IN
COMP
COMP
COMP
COMP
= 5V, and I
= 5V, V
= 5V to 10V
= 3.5V to 10V
= 5V
= 5V, I
= 3.5V to 40V
= 3.5V to 40V
V
= 100 mA to 800 mA
= 300 mA
= 100 mA to 800 mA
COMP
= −30 µA to +30 µA
= 2.0V (Max Duty Cycle)
= 1.0V
= 1.0V
= 1.0V
= 1.1V to 1.9V
= 1.0 MΩ (Note 7)
= 2.0A
= 100 mA
= 100 mA
J
J
FEEDBACK
LOAD
= 25˚C, and those in bold type face apply over full Operating Temperature
= 25˚C, and those in bold type face apply over full Operating Temperature
= 1.5V (Switch Off)
Conditions
= 2.0V
SWITCH
Conditions
= 800 mA
= V
= 0.
REF
7
, and I
SWITCH
Typical
1.230
Typical
3700
12.0
2.90
100
800
7.5
0.5
20
20
80
25
52
4.3
= 0.
LM1577-ADJ LM2577-ADJ
(Continued)
(Notes 3, 4)
11.60/11.40
12.40/12.60
1.214/1.206
1.246/1.254
(Notes 3, 4)
LM1577-15
2400/1600
4800/5800
10.0/14.0
2.70/2.65
3.10/3.15
300/800
500/250
50/100
50/100
3.7/3.0
5.3/6.0
50/85
48/42
56/62
Limit
Limit
LM2577-15
11.60/11.40
12.40/12.60
1.214/1.206
1.246/1.254
2400/1600
4800/5800
10.0/14.0
2.70/2.65
3.10/3.15
(Note 5)
(Note 5)
300/800
500/250
3.7/3.0
5.3/6.0
50/100
50/100
Limit
50/85
48/42
56/62
Limit
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µmho(max)
µmho(min)
kHz(max)
mV(max)
mV(max)
mA(max)
mA(max)
kHz(min)
(Limits)
V/V(min)
nA(max)
(Limits)
A(max)
A(min)
V(max)
V(max)
V(max)
V(min)
V(min)
V(min)
Units
Units
µmho
kHz
V/V
mV
mV
mA
mA
mV
nA
A
%
V
V
V