Datasheet

LM3208
www.ti.com SNVS404B –APRIL 2006–REVISED MARCH 2013
SYSTEM CHARACTERISTICS
The following spec table entries are specified by design providing the component values in the typical application circuit are
used (L = 3.0µH, DCR = 0.12Ω, FDK MIPW3226D3R0M; C
IN
= 10µF, 6.3V, 0805, TDK C2012X5R0J106K; C
OUT
= 4.7µF,
6.3V, 0603, TDK C1608X5R0J475M). These parameters are not specified 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
= V
DD
= EN = 3.6V
and T
A
= 25°C unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
T
RESPONSE
Time for V
OUT
to rise from 0.8V V
IN
= 4.2V, R
LOAD
= 5.5Ω
25 40 µs
to 3.4V (to reach 3.35V)
Time for V
OUT
to fall from 3.4V V
IN
= 4.2V, R
LOAD
= 15Ω
35 45 µs
to 0.8V
C
CON
V
CON
input capacitance V
CON
= 1V, V
IN
= 2.7V to 5.5V,
5 10 pF
Test frequency = 100kHz
C
EN
EN input capacitance EN = 2V, V
IN
= 2.7V to 5.5V,
5 10 pF
Test frequency = 100kHz
V
CON
R
DSON(P)
management threshold Threshold for PFET R
DSON(P)
to change
0.39 0.42 0.45 V
(S>L) from 960mΩ to 140mΩ
V
CON
R
DSON(P)
management threshold Threshold for PFET R
DSON(P)
to change
0.37 0.40 0.43 V
(L>S) from 140mΩ to 960mΩ
I
OUT, MAX
Maximum Output Current V
IN
= 2.7V to 5.5V,
V
CON
= 0.45V to 1.44V, 650 mA
L = MIPW3226D3R0
V
IN
= 2.7V to 5.5V,
V
CON
= 0.32V to 0.45V, 400 mA
L = MIPW3226D3R0
Linearity Linearity in control range 0.32V V
IN
= 3.9V
(1)
–3 +3 %
to 1.44V Monotonic in nature
−50 +50 mV
T
ON
Turn on time EN = Low to High, V
IN
= 4.2V,
(time for output to reach 97% of V
OUT
= 3.4V,
40 60 µs
final value after Enable low to I
OUT
≤ 1mA
high transition)
η Efficiency V
IN
= 3.6V, V
OUT
= 0.8V, I
OUT
= 90mA 81 %
V
IN
= 3.6V, V
OUT
= 1.5V, I
OUT
= 150mA 89 %
V
IN
= 3.9V, V
OUT
= 3.4V, I
OUT
= 400mA 95 %
V
OUT
_ripple Ripple voltage at V
IN
= 2.7V to 4.5V, V
OUT
= 0.8V to 3.4V,
no pulse skip condition Differential voltage = V
IN
– V
OUT
> 1V, 10 mVp-p
I
OUT
= 0mA to 400mA
(2)
Ripple voltage at V
IN
= 5.5V to dropout, V
OUT
= 3.4V,
60 mVp-p
pulse skip condition I
OUT
= 650mA
(2)
Line_tr Line transient response V
IN
= 3.6V to 4.2V,
T
R
= T
F
= 10µs, 50 mVpk
V
OUT
= 0.8V, I
OUT
= 100mA
Load_tr Load transient response V
IN
= 3.1 / 3.6 / 4.5V, V
OUT
= 0.8V,
50 mVpk
I
OUT
= 50mA to 150mA
Max Duty Maximum duty cycle
100 %
cycle
(1) Linearity limits are ±3% or ±50mV whichever is larger.
(2) Ripple voltage should be measured at C
OUT
electrode on a well-designed PC board and using the suggested inductor and capacitors.
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