LTC3445 Datasheet, PDF (4/24 Pages) Linear Technology – I2C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN

LTC3445
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC1 = V_CC2 = 3.6V, unless otherwise noted.
SYMBOL
t_SU(RSTA)
t_SU(STOP)
t_HD(DIN)
t_SU(DAT)
V_THR
V_HYS
I_LVTRACK
I_LVBACKUP
I_LADD7
I_LADD6
I_LSCL
I_LSDA
I_LLDO1
I_LLDO2
I_LLDO1FB
I_LLDO2FB
I_LBATTFAULT
I_FB1,2
PARAMETER
Repeated Start Condition Setup Time
Stop Condition Setup Time
Data Hold Time, Input
Data Setup Time
SCL and SDA Logic Input Threshold
SCL and SDA Logic Input Hysteresis
V_TRACK Leakage
V_BACKUP Leakage
ADD7 Leakage
ADD6 Leakage
SCL Leakage
SCL Leakage
LDO1 Leakage
LDO2 Leakage
LDO1FB Leakage
LDO2FB Leakage
BATTFAULT Leakage
LDO Feedback Input Current
CONDITIONS
(Note 5)
(Note 5)
(Note 5)
(Note 5)
(Note 5)
V_CC = 3.6V
V_CC = 3.6V
V_CC = 3.6V
V_CC = 3.6V
V_CC = 3.6V
V_CC = 3.6V
V_CC = 3.6V, RUN = 0
V_CC = 3.6V, RUN = 0
V_CC = 3.6V, RUN = 0
V_CC = 3.6V, RUN = 0
V_CC = 3.6V
V_FB1 = 0.6V
MIN TYP MAX
600
600
0
100
1.8
50
1.44 2.2
●
1
●
1
●
1
●
1
●
1
●
1
●
1
●
1
●
1
●
1
●
1
UNITS
ns
ns
ns
ns
V
mV
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3445EUF is guaranteed to meet performance specifica-
tions from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: T_J is calculated from the ambient temperature, T_A, and power
dissipation, P_D, according to the following formula:
T_J = T_A + P_D • 37°C/W
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: Determined by design, not production tested.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
500
400
ALL ON
300
BUCK
200
ONE LDO
TWO LDOs
100
RUN = HIGH
0
RUN = LOW
2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6
SUPPLY VOLTAGE (V)
3445 G01
4
V_OUT vs DAC
1.6
0mA
1.5
600mA
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0
10 20 30 40 50 60 70 80
DAC VALUE
3445 G02
V_OUT Step Size vs DAC
0.016
0.014
0.012
100mA
0.010
0.008
0.006
0.004
0.002
0
–0.002
0
10 20 30 40 50 60 70 80
DAC VALUE
3445 G03
3445fa