ltc3445euf-pbf Linear Technology Corporation, ltc3445euf-pbf Datasheet - Page 3

• Manufacturer Part Number: ltc3445euf-pbf
• Description: I2c Controllable Buck Regulator With Two Ldos In A 4mm ? 4mm Qfn
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL
I
f
R
R
I
LDO1
I
V
V
LDO2
I
V
V
PowerPath Controller
V
V
V
V
I
V
I
BATTFAULT V
I
f
t
t
S
OSC
LSW
S
S
BACKUP
VCCBATT
2
I2C(MAX)
BUF
HD(RSTA)
PFET
NFET
OUT
FB
OUT
FB
TRACK
TRACK
CC
BACKUP
CC
C Interface
BATT
BATT
–
Additional Input DC Bias Current For Buck (Note 4)
Nominal Oscillator Frequency
R
R
SW Leakage
Additional DC Bias for LDO1
Regulated Output Voltage
Line Regulation
Load Regulation
Dropout Voltage
LDO Feedback Voltage
Additional DC Bias for LDO2
Regulated Output Voltage
Line Regulation
Load Regulation
Dropout Voltage
LDO Feedback Voltage
Tracked Input Voltage
Backup Battery Voltage
Backup Battery Bias Current
V
Max V
V
Hysteresis
Maximum I
Bus Free Time Between Stop and Start
Condition
Hold Time After (Repeated)
Start Condition
PARAMETER
Tracked Output Voltage at V
CC
CC1
CC1
DS(ON)
DS(ON)
Active Mode
Sleep Mode
BATT Output
High Level (Good)
Low Level (Bad)
CC
of P-Channel FET
of N-Channel FET
BATT Output Current
2
C Operating Frequency
CC
BATT
CONDITIONS
V
V
V
V
I
I
V
2.5V < V
∆V
V
I
I
2.5V < V
∆V
V
I
I
3V < V
V
V
V
V
(Note 5)
(Note 5)
(Note 5)
Where BATTFAULT Goes High
Where BATTFAULT Goes Low
SW
SW
LOAD
LOAD
LOAD
LOAD
OUT
OUT
OUT
OUT
RUN
CC2
CC2
CC1
TRACK
CC1
CC1
A
CC2
CC2
= 25°C. V
= 100mA
= –100mA
= 2.5V, ∆I
= 2.5V, ∆I
= V
= 2.5V
= 0V to 4.2V, 4.2 to 0V
= 90%, I
= 103%, I
= 100%
= 0V
= 0V, V
= 50mA
= 0mA
= 50mA
= 0mA
TRACK
= 2.5V to 5.5V, I
= 2.5V to 5.5V, I
= 0V, V
IN
IN
TRACK
The
< 5.5V, 1mA < I
< 5.5V, 1mA < I
SW
< V
LOAD
●
CC1
= 0V, V
CC1
LOAD
LOAD
LOAD
CC1
= 0V or 5V, V
denotes the specifications which apply over the full operating
= 4V, I
= V
= 0A
– 0.2V
= 0A
= 1mA to 50mA, V
= 1mA to 50mA, V
BACKUP
CC2
LOAD
LOAD
VCCBAT
LOAD
LOAD
= 3.6V, unless otherwise noted.
= 1mA, V
= 1mA, V
= 2.5V
CC1
< 50mA
< 50mA
= 8mA
= 5V
OUT
OUT
OUT
OUT
= 1.2V
= 1.2V
= 1.2V
= 1.2V
●
●
●
0.582
0.582
0.582
0.582
–0.2
MIN
2.85
2.65
1.2
2.4
3
2
0.325
0.45
TYP
220
300
1.5
0.3
0.6
0.3
0.6
2.8
2.5
0.3
23
23
6
1
1
1
0
4
3
8
LTC3445
V
V
V
0.618
0.618
MAX
CC2
CC2
CC1
400
600
1.8
0.3
0.3
0.2
0.2
5.5
6.5
3.1
2.9
2.6
1.3
30
15
30
15
5
5
–
–
–
UNITS
3445fa
3
MHz
kHz
kHz
mV
mV
mV
mV
mA
µA
µA
µA
µA
µA
µA
µs
ns
Ω
Ω
V
V
V
V
V
V
V
V
V
V
V
V
V