LM3477MM National Semiconductor, LM3477MM Datasheet - Page 4

• Manufacturer Part Number: LM3477MM
• Description: Pulse Width Modulation (PWM) Controller IC
• Manufacturer: National Semiconductor

Specifications of LM3477MM

• Input Voltage Primary Min: 2.95V
• Mounting Type: Surface Mount
• Topology: Buck (Step Down)
• Control Mode: Current
• Duty Cycle Max: 93%
• Input Voltage Primary Max: 35V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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V
V
V
V
V
V
Gm
A
I
V
T
T
T
Electrical Characteristics
EAO
SS
r
f
Specifications in Standard type face are for T
Range. Unless otherwise specified, V
CL(O)
CL(100)
SC
SL
OVP
OVP(HYS)
VOL
EAO
Symbol
Current Limit Voltage at 0% Duty
Cycle
Current Limit Voltage at 100%
Duty Cycle
Short-Circuit Current Limit Sense
Voltage
Internal Compensation Ramp
Voltage Height
Output Over-voltage Protection
(with respect to feedback
voltage) (Note 7)
Output Over-Voltage Protection
Hysteresis(Note 7)
Error Amplifier
Transconductance
Error Amplifier Voltage Gain
Error Amplifier Output Current
(Source/ Sink)
Error Amplifier Output Voltage
Swing
Internal Soft-Start Delay
Drive Pin Rise Time
Drive Pin Fall Time
Parameter
IN
= 12V.
(Note 4) (Continued)
J
= 25˚C, and in bold type face apply over the full Operating Temperature
LM3477
LM3477A
LM3477
LM3477A
V
V
V
V
V
V
V
I
(Source/Sink)
V
I
(Source/Sink)
Source, V
V
Sink, V
Upper Limit
V
COMP Pin = Floating
Lower Limit
V
V
Floating
C
to 3V
C
to 3V
= 1.4V
EAO
EAO
IN
IN
IN
IN
COMP
COMP
COMP
COMP
FB
FB
FB
FB
GS
GS
= 5V, LM3477
= 5V, LM3477A
= 5V, LM3477
= 5V, LM3477A
= 0V
= 0V
= 1.4V
= 1.2V, V
= 3000pF, V
= 3000pF, V
= 100µA
= 100µA
COMP
Conditions
= 1.4V
= 1.4V
= 1.4V
= 1.4V
COMP
4
= 1.4V, V
COMP
= 1.4V,
DR
DR
=
= 0
= 0
FB
Typical
−140
0.75
155
165
350
310
103
750
100
2.2
74
65
83
50
60
38
25
25
5
−170/−180
1000/1265
−110/−95
130/125
185/190
140/135
195/200
600/365
130/160
50/43
98/98
41/25
89/98
32/25
78/85
75/50
Limit
2.35
0.95
270
420
260
380
110
2.0
0.5
20
30
42
µmho (max)
µmho (min)
V/V (max)
mV (max)
mV (max)
mV (max)
mV (max)
mV (max)
mV (max)
V/V (min)
mV (min)
mV (min)
mV (min)
mV (min)
mV (min)
mV (min)
mV(max)
mV(max)
µA (max)
µA (max)
mV(min)
mV(min)
µA (min)
µA (min)
V(max)
V(max)
V(min)
V(min)
Units
µmho
msec
V/V
mV
mV
mV
mV
mV
mV
mV
mV
mV
µA
µA
ns
ns
V
V