Datasheet

LTC3577/LTC3577-1
7
3577fa
ELECTRICAL CHARACTERISTICS
Step-Down Switching Regulators. The l denotes the specifi cations
which apply over the full operating temperature range, otherwise specifi cations are at T
A
= 25°C. V
OUT
= V
IN12
= V
IN3
= 3.8V,
all regulators enabled unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LDO Regulator 1 (LDO1 – Enabled via I
2
C)
V
INLDO1
Input Voltage Range V
INLDO1
≤ V
OUT
+ 0.3V
l
1.65 5.5 V
V
OUT_UVLO
V
OUT
Falling
V
OUT
Rising
LDO1 is Disabled Below V
OUT
UVLO 2.5 2.7
2.8 2.9
V
V
I
QLDO1_VO
I
QLDO1_VI
LD01 V
OUT
Quiescent Current
LD01 V
INLDO1
Quiescent Current
LDO1 Enabled, PON State, I
LDO1
= 0mA
LDO1 Enabled, PON State, I
LDO1
= 0mA
18
0.1
30
2
µA
µA
I
VINLDO1
Shutdown Current LDO1 Disabled, PON or POFF State 0.01 1 µA
V
LDO1_FB
LDO1_FB Regulated Feedback Voltage I
LDO1
= 1mA
l
0.78 0.8 0.82 V
LDO1_FB Line Regulation (Note 11) I
LDO1
= 1mA, V
IN
= 1.65V to 5.5V 0.4 mV/V
LDO1_FB Load Regulation (Note 11) I
LDO1
= 1mA to 150mA 5 µV/mA
I
LDO1_FB
LDO1_FB Input Current LDO1_FB = 0.8V –50 50 nA
I
LDO1_OC
Available Output Current
l
150 mA
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
R
SW3_PD
SW3 Pull-Down in Shutdown POFF State 10 kΩ
500mA Step-Down Switching Regulator 2 (Buck2 – Pushbutton Enabled, Second in Sequence)
I
VIN12Q
Pulse-Skipping Mode Input Current (Note 10) 100 µA
Burst Mode Operation Input Current (Note 10) 17 µA
Shutdown Input Current 0.01 µA
I
LIM2
Peak PMOS Current Limit (Note 7) 650 900 1200 mA
V
FB2
Feedback Voltage Pulse-Skipping Mode
Burst Mode Operation
l
l
0.78
0.78
0.8
0.8
0.82
0.824
V
V
I
FB2
FB2 Input Current (Note 10) –0.05 0.05 µA
D2 Max Duty Cycle FB2 = 0V 100 %
R
P2
R
DS(ON)
of PMOS I
SW2
= 100mA 0.6 Ω
R
N2
R
DS(ON)
of NMOS I
SW2
= –100mA 0.6 Ω
R
SW2_PD
SW2 Pull-Down in Shutdown POFF State 10 kΩ
500mA Step-Down Switching Regulator 1 (Buck1 – Pushbutton Enabled, First in Sequence)
I
VIN12Q
Pulse-Skipping Mode Input Current (Note 10) 100 µA
Burst Mode Operation Input Current (Note 10) 17 µA
Shutdown Input Current 0.01 µA
I
LIM1
Peak PMOS Current Limit (Note 7) 650 900 1200 mA
V
FB1
Feedback Voltage Pulse-Skipping Mode
Burst Mode Operation
l
l
0.78
0.78
0.8
0.8
0.82
0.824
V
V
I
FB1
FB1 Input Current (Note 10) –0.05 0.05 µA
D1 Max Duty Cycle FB1 = 0V 100 %
R
P1
R
DS(ON)
of PMOS I
SW1
= 100mA 0.6 Ω
R
N1
R
DS(ON)
of NMOS I
SW1
= –100mA 0.6 Ω
R
SW1_PD
SW1 Pull-Down in Shutdown POFF State 10 kΩ
LDO Regulators. The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations
are at T
A
= 25°C. V
INLDO1
= V
INLDO2
= V
OUT
= V
BAT
= 3.8V, LDO1 and LDO2 enabled unless otherwise noted.