Datasheet

LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
4
3554123fd
POWER MANAGER ELECTRICAL CHARACTERISTICS
The l denotes specifications that
apply over the full operating junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2), V
BUS
= 5V, V
BAT
= 3.8V,
HPWR = SUSP = PWR_ON1 = PWR_ON2 = 0V, R
PROG
= 1.87k, STBY = High, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
DIS
NTC Disable Threshold Voltage Falling NTC Voltage
Hysteresis
l
1.2 1.7
50
2.2 %V
BUS
mV
I
NTC
NTC Leakage Current V
NTC
= V
BUS
= 5V –50 50 nA
Ideal Diode
V
FWD
Forward Voltage Detection (Note 12) 15 mV
R
DROPOUT
Diode On-Resistance, Dropout I
OUT
= 200mA, V
BUS
= 0V 240 mΩ
I
MAX
Diode Current Limit (Note 7) 1 A
Logic Inputs (HPWR, SUSP)
V
IL
Input Low Voltage 0.4 V
V
IH
Input High Voltage 1.2 V
R
PD
Internal Pull-Down Resistance 4 MΩ
Logic Output (CHRG)
V
OL
Output Low Voltage I
CHRG
= 5mA 65 250 mV
I
CHRG
Output Hi-Z Leakage Current V
BAT
= 4.5V, V
CHRG
= 5V 0 1 µA
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
BVIN Input Supply Voltage (Note 9)
l
2.7 5.5 V
V
OUT
UVLO V
OUT
Falling
V
OUT
Rising
BVIN Connected to V
OUT
Through Low
Impedance. V
OUT
UVLO Disables the Switching
Regulators.
2.5 2.6
2.8 2.9
V
V
f
OSC
Oscillator Frequency FSEL High
FSEL Low
1.91
0.955
2.25
1.125
2.59
1.295
MHz
MHz
I
FB1
I
FB2
FB1 Input Current (Note 8)
FB2 Input Current (Note 8)
–0.05
–0.05
0.05
0.05
µA
µA
R
SW1_PD
R
SW2_PD
SW1 Pull-Down in Shutdown
SW2 Pull-Down in Shutdown
PWR_ON1 = 0V
PWR_ON2 = 0V
10
10
kΩ
kΩ
Logic Input Pins (FSEL, STBY)
Input High Voltage 1.2 V
Input Low Voltage 0.4 V
Input Current –1 1 µA
Switching Regulator 1 in Normal Operation (STBY Low)
I
LIM1
Peak PMOS Current Limit PWR_ON1 = 3.8V (Note 7) 300 450 600 mA
V
FB1
Regulated Feedback Voltage PWR_ON1 = 3.8V
l
780 800 820 mV
D1 Max Duty Cycle 100 %
R
P1
R
DS(ON)
of PMOS I
SW1
= 100mA 1.1 Ω
R
N1
R
DS(ON)
of NMOS I
SW1
= –100mA 0.7 Ω
Switching Regulator 1 in Standby Mode (STBY High)
V
FB1_LOW
Feedback Voltage Threshold PWR_ON1 = 3.8V, V
FB1
Falling
l
770 800 820 mV
I
SHORT1_SB
Short-Circuit Current 10 21 50 mA
V
DROP1_SB
Standby Mode Dropout Voltage PWR_ON1 = 2.9V, I
SW1
= 5mA, V
FB1
= 0.77V,
V
OUT
= 2.9V, BVIN = 2.9V
25 60 mV
SWITCHING REGULATOR ELECTRICAL CHARACTERISTICS
The l denotes
specifications that apply over the full operating junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2).
V
OUT
= BVIN = 3.8V, PWR_ON1 = PWR_ON2 = 0V, unless otherwise noted.