Datasheet

TEMPERATURE (°C)
RESISTANCE (mÖ)
150
125
100
75
50
25
0
-40 -20 0 20 40 60 80 100
NFET = 2.5V
NFET = 2.7V
NFET = 3.6V
NFET = 5.5V
TEMPERATURE (°C)
RESISTANCE (mÖ)
200
175
150
125
100
75
50
25
0
-40 -20 0 20 40 60 80 100
PFET_RDS = 2.5V
PFET_RDS = 2.7V
PFET_RDS = 3.6V
PFET_RDS = 5.5V
TEMPERATURE (°C)
IQ_PWM (éA)
900
800
700
600
500
400
300
200
-40 -20 0 20 40 60 80 100
IQ_2.5V
IQ_3.6V
IQ_5.5V
TEMPERATURE (°C)
FREQUENCY (MHz)
2.4
2.3
2.2
2.1
2.0
1.9
-40 -20 0 20 40 60 80 100
V
IN
= 2.5V
V
I
N
= 3.6V
V
I
N
= 5.5V
LM3668
SNVS449M –JUNE 2007–REVISED MAY 2013 www.ti.com
TYPICAL PERFORMANCE CHARACTERISTICS
Typical Application Circuit (Figure 1): V
IN
= 3.6V, L = 2.2 µH, C
IN
= 10 µF, C
OUT
= 22 µF
(1)
, T
A
= 25°C , unless otherwise
stated.
Supply Current Switching Frequency
vs vs.
Temperature (Not switching) Temperature
(V
OUT
= 3.4V) (V
OUT
= 3.4V)
Figure 6. Figure 7.
NFET_RDS (on) PFET_RDS (on)
vs. vs.
Temperature Temperature
(V
OUT
= 3.4V) (V
OUT
= 3.4V)
Figure 8. Figure 9.
(1) C
IN
and C
OUT
: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics. C
OUT_MIN
should not
exceed −40% of suggested value. The preferable choice would be a type and make MLCC that issues −30% over the operating
temperature and voltage range.
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