LM3478MM National Semiconductor, LM3478MM Datasheet - Page 4

• Manufacturer Part Number: LM3478MM
• Description: Pulse Width Modulation (PWM) Controller IC
• Manufacturer: National Semiconductor

Specifications of LM3478MM

• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Mounting Type: Surface Mount
• Features: High Efficiency
• Package / Case: 8-MSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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Electrical Characteristics
V
V
V
V
Gm
A
I
V
T
T
T
VSD
I
TSD
T
θ
EAO
SD
Symbol
JA
Specifications in Standard type face are for T
Range. Unless otherwise specified, V
SS
r
f
sh
SC
SL
OVP
OVP(HYS)
VOL
EAO
Short-Circuit Current
Limit Sense Voltage
Internal Compensation
Ramp Voltage
Output Over-voltage
Protection (with
respect to feedback
voltage) (Note 8)
Output Over-Voltage
Protection
Hysteresis(Note 8)
Error Ampifier
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
Shutdown threshold
(Note 5)
Shutdown Pin Current
Thermal Shutdown
Thermal Shutdown
Hysteresis
Thermal Resistance
Parameter
IN
= 12V, R
(Continued)
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
Cgs = 3000pf, V
3V
Cgs = 3000pf, V
3V
Output = High
Output = Low
V
V
MM Package
= 1.4V
EAO
EAO
IN
IN
COMP
COMP
COMP
COMP
FB
FB
FB
FB
SD
SD
J
= 25˚C, and in bold type face apply over the full Operating Temperature
= 5V
= 5V
= 0V
= 0V
= 1.4V
= 1.2V, V
= 5V
= 0V
= 100µA
= 100µA
FA
COMP
Conditions
= 1.4V
= 1.4V
= 1.4V
= 1.4V
= 40kΩ
COMP
= 1.4V, V
COMP
= 1.4V,
DR
DR
4
= 0 to
= 0 to
=
FB
Typical
−140
0.56
1.27
0.65
325
800
110
165
200
2.2
92
50
60
38
25
25
−1
+1
10
4
1000/ 1265
−180/ −185
−100/ −85
600/ 365
140/ 180
32/ 25
78/ 85
80/ 50
Limit
1.35
0.35
235
395
132
110
1.8
2.4
0.2
1.0
52
20
26
44
µmho (max)
µmho (min)
V/V (max)
mV (max)
V/V (min)
mV (min)
mV(max)
mV(max)
mV(max)
µA (max)
µA (max)
mV(min)
mV(min)
mV(min)
µA (min)
µA (min)
V (max)
V(max)
V(max)
V (min)
V(min)
V(min)
Units
µmho
msec
˚C/W
V/V
mV
mV
mV
mV
µA
µA
µA
ns
ns
˚C
˚C
V
V
V
V