Datasheet

LTC3553
5
3553fb
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
INLDO
Input Voltage Range (Note 9)
l
1.65 5.5 V
V
OUT
UVLO V
OUT
Undervoltage Lockout V
OUT
Falling
V
OUT
Rising
2.5 2.6
2.8 2.9
V
V
V
LDO_FB
Regulated Feedback Voltage I
LDO
= 1mA, STBY High or Low (Note 10)
l
780 800 820 mV
V
LDO_FB
Line Regulation I
LDO
= 1mA, V
INLDO
= 1.65V to 5.5V (Note 10) 0.7 mV/V
V
LDO_FB
Load Regulation I
LDO
= 1mA to 150mA (Note 10) 0.025 mV/mA
I
LDO_FB
Feedback Pin Input Current –50 50 nA
I
LDO_OC
Available Output Current
l
150 mA
I
LDO_SC
Short-Circuit Output Current (Note 7) 300 mA
V
DROP
Dropout Voltage (Note 13) I
LDO
= 150mA, V
INLDO
= 3.8V
I
LDO
= 150mA, V
INLDO
= 2.5V
I
LDO
= 75mA, V
INLDO
= 1.8V
160
220
180
260
350
280
mV
mV
mV
t
LDO_SS
Soft-Start Time 0.2 ms
R
LDO_PD
Output Pull-Down Resistance in Shutdown LDO_ON = 0V 10 k
PUSHBUTTON INTERFACE ELECTRICAL CHARACTERISTICS
The l denotes specifi cations that apply over the full operating temperature range, otherwise specifi cations are at T
A
= 25°C (Note 2).
V
BAT
= 3.8V, unless otherwise noted.
LDO REGULATOR ELECTRICAL CHARACTERISTICS
The l denotes specifi cations that apply over the full operating temperature range, otherwise specifi cations are at T
A
= 25°C (Note 2).
LDO_ON = V
OUT
= V
INLDO
= 3.8V, STBY = 0V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Pushbutton Pin (ON)
V
CC_PB
Pushbutton Operating Supply Range (Notes 4 , 9)
l
2.7 5.5 V
V
ON_TH
ON Threshold Rising
ON Threshold Falling 0.4
1.2 V
V
I
ON
ON Input Current V
ON
= V
CC
(Note 4) –1 1 µA
R
PB_PU
Pushbutton Pull-Up Resistance Pull-Up to V
CC
(Note 4) 200 400 650 k
Logic Input Pins (BUCK_ON, LDO_ON, SEQ)
Input High Voltage
Input Low Voltage
1.2
0.4
V
V
Input Current –1 1 µA
Status Output Pin (PBSTAT)
I
PBSTAT
PBSTAT Output High Leakage Current V
PBSTAT
= 3V –1 1 µA
V
PBSTAT
PBSTAT Output Low Voltage I
PBSTAT
= 3mA 0.1 0.4 V