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LM3218 Folha de dados(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM3218
Descrição Electrónicos  650 mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3218 Folha de dados(HTML) 4 Page - National Semiconductor (TI)

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System Characteristics
The following spec table entries are guaranteed by design providing the component
values in the typical application circuit are used (L = LTCC Inductor, 2.6 µH; DCR = 150 m
Ω; C
IN = 10 µF, 6.3V, 0603, TDK
C1608X5R0J106K; C
OUT = 4.7 µF, 6.3V, 0603, C1608X5R0J475M). These parameters are not guaranteed by production
testing. Min and Max values are specified over the ambient temperature range T
A = −30°C to 85°C. Typical values are specified
at PV
IN = VDD = EN = 3.6V and TA = 25°C unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
T
RESPONSE
(Rise Time)
Time for V
OUT to rise from 0.8V
to 3.4V (to reach 3.35V)
V
IN = 4.2V
R
LOAD = 5.5Ω
25
40
µs
T
RESPONSE
(Fall Time)
Time for V
OUT to fall from 3.4V to
0.8V
V
IN = 4.2V
R
LOAD = 15Ω
35
45
µs
C
CON
V
CON input capacitance
V
CON = 1V, VIN=2.7V to 5.5V
Test frequency = 100 KHz
5
10
pF
C
EN
EN input capacitance
EN = 2V, V
IN= 2.7V to 5.5V
Test frequency = 100 KHz
5
10
pF
V
CON
(S>L)
R
DSON(P) management threshold Threshold for PFET RDSON(P) to change
from 960 m
Ω to 140 mΩ
0.39
0.42
0.45
V
V
CON
(L>S)
R
DSON(P) management threshold Threshold for PFET RDSON(P) to change
from 140 m
Ω to 960 mΩ
0.37
0.40
0.43
V
I
OUT, MAX
Maximum Output Current
V
IN = 2.7V to 5.5V
V
CON = 0.45V to 1.44V
650
mA
V
IN = 2.7V to 5.5V
V
CON = 0.32V to 0.45V
400
mA
Linearity
Linearity in control range 0.32V
to 1.44V
V
IN = 3.9V (Note 14)
Monotonic in nature
−3
+3
%
−50
+50
mV
T
ON
Turn on time
(time for output to reach 97% of
final value after Enable low-to-
high transition)
EN = Low to High
V
IN = 4.2V, VOUT = 3.4V,
I
OUT 1mA
40
60
µs
η
Efficiency
V
IN = 3.6V, VOUT = 0.8V
I
OUT = 90mA
81
%
V
IN = 3.6V, VOUT = 1.5V
I
OUT = 150mA
89
%
V
IN = 3.9V, VOUT = 3.4V
I
OUT = 400 mA
95
%
V
O_ripple
Ripple voltage at
no pulse skip condition
V
IN = 2.7V to 4.5V, VOUT = 0.8V to 3.4V,
Differential voltage = V
IN - VOUT > 1V,
I
OUT = 0 mA to 400 mA (Note 12)
10
mVp-p
Ripple voltage at
pulse skip condition
V
IN = 5.5V to dropout, VOUT = 3.4V,
I
OUT = 650 mA (Note 12)
60
mVp-p
Line_tr
Line transient response
V
IN = 3.6V to 4.2V,
T
R = TF = 10 µs,
V
OUT = 0.8V, IOUT = 100 mA
50
mVpk
Load_tr
Load transient response
V
IN = 3.1/3.6/4.5V, VOUT = 0.8V,
I
OUT = 50 mA to 150 mA
50
mVpk
Max Duty
cycle
Maximum duty cycle
100
%
www.national.com
4


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