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LM3224 Arkusz danych(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Numer części LM3224
Szczegółowy opis  615kHz/1.25MHz Step-up PWM DC/DC Converter
Download  18 Pages
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3224 Arkusz danych(HTML) 4 Page - National Semiconductor (TI)

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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
IN
7.5V
SW Voltage
21V
FB Voltage (Note 2)
7V
V
C Voltage (Note 3)
1.26V ± 0.3V
SHDN Voltage
7.5V
FSLCT
7.5V
Maximum Junction
Temperature
150˚C
Power Dissipation(Note 4)
Internally Limited
Lead Temperature
300˚C
Vapor Phase (60 sec.)
215˚C
Infrared (15 sec.)
220˚C
ESD Susceptibility
(Note 5)
Human Body Model
2kV
Machine Model
200V
Operating Conditions
Operating Junction
Temperature Range (Note 6)
−40˚C to +125˚C
Storage Temperature
−65˚C to +150˚C
Supply Voltage
2.7V to 7V
Maximum Output Voltage
20V
Electrical Characteristics
Specifications in standard type face are for T
J = 25˚C and those with boldface type apply over the full Operating Tempera-
ture Range (T
J = −40˚C to +125˚C). VIN = 2.7V, FSLCT = SHDN = VIN, and IL = 0A, unless otherwise specified.
Symbol
Parameter
Conditions
Min
(Note 6)
Typ
(Note 7)
Max
(Note 6)
Units
I
Q
Quiescent Current
FB = 2V (Not Switching)
1.3
2.0
mA
V
SHDN = 0V
0.1
2.0
µA
V
FB
Feedback Voltage
1.2285
1.26
1.2915
V
I
CL(Note 8)
Switch Current Limit
V
IN = 2.7V (Note 9)
1.9
2.45
2.8
A
V
IN = 3V, VOUT = 8V
2.1
V
IN = 3V, VOUT = 5V
2.2
%V
FB/
∆V
IN
Feedback Voltage Line
Regulation
2.7V
≤ V
IN
≤ 7V
0.085
0.15
%/V
I
B
FB Pin Bias Current (Note
10)
35
250
nA
I
SS
SS Pin Current
7.5
11
13
µA
V
SS
SS Pin Voltage
1.2090
1.2430
1.2622
V
IN
Input Voltage Range
2.7
7
V
g
m
Error Amp Transconductance
∆I = 5µA
40
87
135
µmho
A
V
Error Amp Voltage Gain
78
V/V
D
MAX
Maximum Duty Cycle
85
92.5
%
f
S
Switching Frequency
FSLCT = Ground
450
615
750
kHz
FSLCT = V
IN
0.9
1.25
1.5
MHz
I
SHDN
Shutdown Pin Current
V
SHDN = 2.7V
2.4
5.0
µA
V
SHDN = 0.3V
0.3
1.2
I
L
Switch Leakage Current
V
SW = 20V
0.2
8.0
µA
R
DSON
Switch R
DSON
V
IN = 2.7V, ISW = 1A
0.15
0.4
Th
SHDN
Shutdown Threshold
Output High
1.2
0.8
V
Output Low
0.8
0.3
V
UVP
On Threshold
2.3
2.5
V
Off Threshold
2.6
2.7
V
Note 1: Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to
be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The FB pin should never exceed VIN.
Note 3: Under normal operation the VC pin may go to voltages above this value. This maximum rating is for the possibility of a voltage being applied to the pin,
however the VC pin should never have a voltage directly applied to it.
Note 4: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJA,
and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PD (MAX) = (TJ(MAX) −TA)/θJA.
Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown.
www.national.com
4


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