Datasheet

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°C. V
IN
= 3.6V unless otherwise specified. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
PG(THRESH)
PGOOD Threshold (Note 8)
●
8 10 %
R
PGOOD
PGOOD Output Resistance PGOOD Low, Sinking 1mA
●
87 180 Ω
I
PGOOD
PGOOD Hi-Z Leakage Current V
PGOOD
= 6V
●
1 µA
Synchronous Buck Converter
I
BUCKFB
Feedback Current (Note 5)
●
±30 nA
V
BUCKFB
Regulated Feedback Voltage (Note 5)
●
0.788 0.800 0.812 V
∆V
BUCKFB
Feedback Voltage Line Regulation V
IN
= 2.7V to 5.5V (Note 5)
●
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
●
1.8 2.25 2.7 MHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 500mA 0.13 Ω
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –500mA 0.14 Ω
I
LSW
SW Leakage V
ENBUCK
= 0V, V
SW
= 0V or 5.5V, V
IN
= 5.5V ±1 µA
V
ENBUCK
Buck Enable Pin Threshold
●
0.3 0.65 1 V
I
ENBUCK
Buck Enable Pin Leakage Current V
ENBUCK
= 5.5V, All Other Pins Grounded
●
1 µA
V
MODESEL
Mode Select Pin Threshold
●
0.3 0.65 1 V
I
MODESEL
Mode Select Pin Leakage Current V
MODESEL
= 5.5V, All Other Pins Grounded
●
1 µA
g
m
Error Amplifier Transconductance V
ITH
= 0.6V 450 700 950 µA/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)
●
0.9 5.5 V
I
LVIN
LV
IN
Pin Operating Current I
OUT
= 10µA
●
3 20 µA
LV
IN
Shutdown Current V
ENLDO
= 0V 1.5 2 µA
V
LVFB
Feedback Pin Regulation Voltage (Note 7) 1mA ≤ I
OUT
≤ 300mA, 1.5V ≤ V
LVIN
≤ 5.5V
●
0.395
0.392
0.400
0.400
0.405
0.408
V
V
I
LVFB
Feedback Pin Input Current V
LVFB
at Regulation
●
2 ±10 nA
I
LVOUT(MAX)
Continuous Output Current
●
300 mA
Short-Circuit Output Current 760 mA
V
ENLDOx
LDO Enable Pin Threshold
●
0.3 0.65 1 V
I
ENLDOx
LDO Enable Pin Leakage Current V
ENLDOx
= 5.5V, All Other Pins Grounded
●
1 µA
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 µV/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