LTC3554-3_15 Datasheet, PDF (5/36 Pages) Linear Technology – Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators

LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
S witching Regulator Ele ctrical 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.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Switching Regulator 2 in Normal Operation (STBY Low)
I_LIM2
Peak PMOS Current Limit
V_FB2
Regulated Feedback Voltage
D2
Max Duty Cycle
PWR_ON2 = 3.8V (Note 7)
PWR_ON2 = 3.8V
300 450
600
mA
l 780
800
820
mV
100
%
R_P2
R_DS(ON) of PMOS
R_N2
R_DS(ON) of NMOS
Switching Regulator 2 in Standby Mode (STBY High)
I_SW2 = 100mA
I_SW2 = –100mA
1.1
Ω
0.7
Ω
V_{FB2_LOW}
I_{SHORT2_SB}
V_{DROP2_SB}
Feedback Voltage Threshold
Short-Circuit Current
Standby Mode Dropout Voltage
PWR_ON2 = 3.8V, V_FB2 Falling
l 770
800
820
mV
10
21
50
mA
PWR_ON2 = 2.9V, I_SW2 = 5mA, V_FB2 = 0.77V, V_OUT
= 2.9V, BVIN = 2.9V
25
60
mV
P USHBUTTON INTERFACE Ele ctrical 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_BAT = 3.8V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Pushbutton Pin (ON)
V_{CC_PB}
V_{ON_TH}
Pushbutton Operating Supply Range
ON Threshold Rising
ON Threshold Falling
(Notes 4 , 9)
l 2.7
0.4
5.5
V
1.2
V
V
I_ON
ON Input Current
R_{PB_PU} Pushbutton Pull-Up Resistance
Logic Input Pins (PWR_ON1, PWR_ON2)
V_ON = V_CC (Note 4)
Pull-Up to V_CC (Note 4)
–1
1
µA
200 400
650
kΩ
V_{PWR_ONx} PWR_ONx Threshold Rising
PWR_ONx Threshold Falling
1.2
V
0.4
V
I_{PWR_ONx} PWR_ONx Input Current
Status Output Pins (PBSTAT, PGOOD)
–1
1
µA
I_PBSTAT PBSTAT Output High Leakage Current
V_PBSTAT PBSTAT Output Low Voltage
I_PGOOD
PGOOD Output High Leakage Current
V_PGOOD PGOOD Output Low Voltage
V_THPGOOD PGOOD Threshold Voltage
Pushbutton Timing Parameters (Note 11)
V_PBSTAT = 3V
I_PBSTAT = 3mA
V_PGOOD = 3V
I_PGOOD = 3mA
(Note 10)
–1
1
µA
0.1
0.4
V
–1
1
µA
0.1
0.4
V
–8
%
t_{ON_PBSTATL} Minimum ON Low Time to Cause PBSTAT ON Brought Low During Power-On (PON) or
Low
Power-Up (PUP1, PUP2) States
50
ms
t_{ON_}
Delay from ON High to PBSTAT High
Power-On (PON) State, After PBSTAT Has Been
900
µs
PBSTATH
Low for at Least t_{PBSTAT_PW}
t_{ON_PUP}
Minimum ON Low Time to Enter
Power-Up (PUP1 or PUP2) State
Starting in the Hard Reset (HR) or Power-Off
(POFF) States
400
ms
t_{ON_HR}
Minimum ON Low Time to Hard Reset
ON Brought Low During the Power-On (PON)or
Power-Up (PUP1, PUP2) States
LTC3554/LTC3554-1
4
5
6
s
LTC3554-2/LTC3554-3
11
14
17
s
t_{PBSTAT_PW} PBSTAT Minimum Pulse Width
Power-On (PON) or Power-Up (PUP1, PUP2)
40
50
ms
States
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