LTC3446
3
3446ff
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25癈. V
IN
= 3.6V unless otherwise specified. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V
PG(THRESH)
PGOOD Threshold (Note 8)
?/DIV>
8 10
%
R
PGOOD
PGOOD Output Resistance
PGOOD Low, Sinking 1mA
?/DIV>
87 180
?/DIV>
I
PGOOD
PGOOD Hi-Z Leakage Current
V
PGOOD
= 6V
?/DIV>
1
礎
Synchronous Buck Converter
I
BUCKFB
Feedback Current
(Note 5)
?/DIV>
?0
nA
V
BUCKFB
Regulated Feedback Voltage
(Note 5)
?SPAN class="pst LTC3446IDE-PBF_2464228_7"> 0.788 0.800 0.812
V
V
BUCKFB
Feedback Voltage Line Regulation
V
IN
= 2.7V to 5.5V (Note 5)
?/DIV>
0.3 0.5 mV/V
I
MAXP
Maximum Peak Inductor Current
V
BUCKFB
= 0V, Duty Cycle < 35%
1.2 1.55 2.0
A
I
MAXN
NMOS Overcurrent Limit
1.8
A
Feedback Voltage Load Regulation
(with Respect to V
ITH
)
V
ITH
= 0.5V to 1V, V
MODESEL
= V
IN
(Note 5)
0.5
mV/V
f
OSC
Oscillator Frequency
?SPAN class="pst LTC3446IDE-PBF_2464228_7"> 1.8 2.25 2.7 MHz
R
PFET
R
DS(ON)
of P-Channel FET
I
SW
= 500mA
0.13
?/DIV>
R
NFET
R
DS(ON)
of N-Channel FET
I
SW
= 500mA
0.14
?/DIV>
I
LSW
SW Leakage
V
ENBUCK
= 0V, V
SW
= 0V or 5.5V, V
IN
= 5.5V
?
礎
V
ENBUCK
Buck Enable Pin Threshold
?SPAN class="pst LTC3446IDE-PBF_2464228_7"> 0.3 0.65 1
V
I
ENBUCK
Buck Enable Pin Leakage Current
V
ENBUCK
= 5.5V, All Other Pins Grounded
?/DIV>
1
礎
V
MODESEL
Mode Select Pin Threshold
?/DIV>
0.3 0.65 1
V
I
MODESEL
Mode Select Pin Leakage Current
V
MODESEL
= 5.5V, All Other Pins Grounded ?/SPAN>
1
礎
g
m
Error Amplifier Transconductance
V
ITH
= 0.6V
450 700 950 礎/V
Each VLDO: V
IN
= 3.6V, V
LVIN
= 1.5V, V
LVOUT
= 1.2V, Unless Otherwise Specified
V
LVIN
LV
IN
Pin Operating Voltage
(Note 6)
?/DIV>
0.9
5.5
V
I
LVIN
LV
IN
Pin Operating Current
I
OUT
= 10礎
?/DIV>
3 20
礎
LV
IN
Shutdown Current
V
ENLDO
= 0V
1.5 2
礎
V
LVFB
Feedback Pin Regulation Voltage (Note 7) 1mA d I
OUT
d 300mA, 1.5V d V
LVIN
d 5.5V
?/DIV>
0.395
0.392
0.400
0.400
0.405
0.408
V
V
I
LVFB
Feedback Pin Input Current
V
LVFB
at Regulation
?/DIV>
2 ?0
nA
I
LVOUT(MAX)
Continuous Output Current
?SPAN class="pst LTC3446IDE-PBF_2464228_7"> 300
mA
Short-Circuit Output Current
760
mA
V
ENLDOx
LDO Enable Pin Threshold
?SPAN class="pst LTC3446IDE-PBF_2464228_7"> 0.3 0.65 1
V
I
ENLDOx
LDO Enable Pin Leakage Current
V
ENLDOx
= 5.5V, All Other Pins Grounded
?/DIV>
1
礎
Output Voltage Load Regulation
(Referred to the LV
FB
Pin)
I
OUT
= 1mA to 300mA
1
mV/A
L
VFB
Line Regulation (with Respect to
the L
VIN
Pin)
V
LVIN
= 1.5V to 5.5V, V
IN
= 3.6V, V
LVOUT
= 1.2V,
I
OUT
= 1mA
7.5
礦/V
L
VFB
Line Regulation (with Respect to
the V
IN
Pin)
V
LVIN
= 1.5V, V
IN
= 2.7V to 5.5V, V
LVOUT
= 1.2V,
I
OUT
= 1mA
0.44
mV/V
V
DO
LV
IN
LV
OUT
Dropout Voltage
V
IN
= 2.8V, V
LVIN
= 1.5V, V
LVFB
= 0.37V,
I
OUT
= 300mA (Note 9)
68 175 mV
V
IN
to LV
OUT
Headroom Required for
Regulation (Note 3)
I
LVOUT
= 300mA
l
1.4
V
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