LTC3554 LINER [Linear Technology], LTC3554 Datasheet - Page 4

• Manufacturer Part Number: LTC3554
• Description: Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators
• Manufacturer: LINER [Linear Technology]

LTC3554
SWITCHING REGULATOR ELECTRICAL CHARACTERISTICS
The
V
SYMBOL
BVIN
V
f
I
I
R
R
Logic Input Pins (FSEL, STBY)
Switching Regulator 1 in Normal Operation (STBY Low)
I
V
D1
R
R
Switching Regulator 1 in Standby Mode (STBY High)
V
I
V
Switching Regulator 2 in Normal Operation (STBY Low)
I
V
D2
R
R
Switching Regulator 2 in Standby Mode (STBY High)
V
I
V
4
OSC
FB1
FB2
LIM1
SHORT1_SB
LIM2
SHORT2_SB
OUT
FB1
FB1_LOW
DROP1_SB
FB2
FB2_LOW
DROP2_SB
OUT
SW1_PD
SW2_PD
P1
N1
P2
N2
l
UVLO
= BVIN = 3.8V, PWR_ON1 = PWR_ON2 = 0V, unless otherwise noted.
denotes specifi cations that apply over the full operating temperature range, otherwise specifi cations are at T
PARAMETER
Input Supply Voltage
V
V
Oscillator Frequency
FB1 Input Current (Note 8)
FB2 Input Current (Note 8)
SW1 Pull-Down in Shutdown
SW2 Pull-Down in Shutdown
Input High Voltage
Input Low Voltage
Input Current
Peak PMOS Current Limit
Regulated Feedback Voltage
Max Duty Cycle
R
R
Feedback Voltage Threshold
Short-Circuit Current
Standby Mode Dropout Voltage
Peak PMOS Current Limit
Regulated Feedback Voltage
Max Duty Cycle
R
R
Feedback Voltage Threshold
Short-Circuit Current
Standby Mode Dropout Voltage
OUT
OUT
DS(ON)
DS(ON)
DS(ON)
DS(ON)
Falling
Rising
of PMOS
of NMOS
of PMOS
of NMOS
CONDITIONS
(Note 9)
BVIN Connected to V
Impedance. V
Switching Regulators.
FSEL High
FSEL Low
PWR_ON1 = 0V
PWR_ON2 = 0V
PWR_ON1 = 3.8V (Note 7)
PWR_ON1 = 3.8V
I
I
PWR_ON1 = 3.8V, V
PWR_ON1 = 2.9V, I
V
PWR_ON2 = 3.8V (Note 7)
PWR_ON2 = 3.8V
I
I
PWR_ON2 = 3.8V, V
PWR_ON2 = 2.9V, I
V
SW1
SW1
SW2
SW2
OUT
OUT
= 100mA
= –100mA
= 100mA
= –100mA
= 2.9V, BVIN = 2.9V
= 2.9V, BVIN = 2.9V
OUT
UVLO Disables the
SW2
SW1
FB1
FB2
OUT
= 5mA, V
= 5mA, V
Falling
Falling
Through Low
FB2
FB1
= 0.77V,
= 0.77V,
l
l
l
l
l
–0.05
–0.05
0.955
MIN
1.91
300
780
100
770
300
780
100
770
2.7
2.5
1.2
–1
10
10
1.125
TYP
2.25
450
800
800
450
800
800
2.6
2.8
1.1
0.7
1.1
0.7
10
10
21
25
21
25
A
1.295
MAX
2.59
0.05
0.05
600
600
= 25°C.
820
820
820
820
5.5
2.9
0.4
50
60
50
60
1
UNITS
MHz
MHz
3554f
mA
mV
mV
mA
mV
mA
mV
mV
mA
mV
kΩ
kΩ
μA
μA
μA
%
%
Ω
Ω
Ω
Ω
V
V
V
V
V