Datasheet

LTC3556
4
3556f
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
BUS
= 5V, V
IN1
= V
IN2
= V
IN3
= V
OUT3
= 3.8V, BAT = 3.8V, DV
CC
= 3.3V,
R
PROG
= 1k, R
CLPROG
= 3.01k, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
NTC
V
COLD
Cold Temperature Fault Threshold
Voltage
Rising Threshold
Hysteresis
75.0 76.5
1.5
78.0 %V
BUS
%V
BUS
V
HOT
Hot Temperature Fault Threshold
Voltage
Falling Threshold
Hysteresis
33.4 34.9
1.5
36.4 %V
BUS
%V
BUS
V
DIS
NTC Disable Threshold Voltage Falling Threshold
Hysteresis
0.7 1.7
50
2.7 %V
BUS
mV
I
NTC
NTC Leakage Current V
NTC
= V
BUS
= 5V –50 50 nA
Ideal Diode
V
FWD
Forward Voltage V
BUS
= 0V, I
OUT
= 10mA
I
OUT
= 10mA
2
15
mV
mV
R
DROPOUT
Internal Diode On-Resistance, Dropout V
BUS
= 0V 0.18 
I
MAX_DIODE
Internal Diode Current Limit 1.6 A
Always On 3.3V Supply
V
LDO3V3
Regulated Output Voltage 0mA < I
LDO3V3
< 25mA 3.1 3.3 3.5 V
R
CL_LDO3V3
Closed-Loop Output Resistance 4 
R
OL_LDO3V3
Dropout Output Resistance 23 
Logic (ENALL, PGOODALL)
V
IL
Logic Low Input Voltage ENALL Pin 0.4 V
V
IH
Logic High Input Voltage ENALL Pin 1.2 V
R
PD
Pull-Down Resistance ENALL Pin 4.5 M
V
OL
Logic Low Output Voltage PGOODALL Pin, I
PULL-UP
= 5mA 0.07 0.2 V
I
OH
Logic High Leakage Current PGOODALL Pin, V
PGOODALL
= 5V 1 µA
t
PGOODALL
PGOODALL Assertion Delay 230 ms
I
2
C Port (Note 9)
DV
CC
Input Supply Voltage 1.6 5.5 V
I
DVCC
DV
CC
Current SCL/SDA = 0kHz 0.3 1 µA
V
DVCC_UVLO
DV
CC
UVLO 1.0 V
ADDRESS I
2
C Address 0001 001[0]
V
IH
SDA, SCL
V
IL
SDA, SCL
Input High Voltage
Input Low Voltage
70
30
%DV
CC
%DV
CC
I
IH
, I
IL
SDA, SCL Input High/Low Current –1 0 1 µA
V
OL
SDA SDA Output Low Voltage I
SDA
= 3mA 0.4 V
f
SCL
Clock Operating Frequency 400 kHz
t
BUF
Bus Free Time Between Stop and Start
Condition
1.3 µs
t
HD_STA
Hold Time After (Repeated) Start
Condition
0.6 µs
t
SU_STA
Repeated Start Condition Setup Time 0.6 µs
t
SU_STO
Stop Condition Setup Time 0.6 µs
t
HD_DAT(O)
Data Hold Time Output 0 900 ns