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| LTC3445_15 Datasheet, PDF (3/24 Pages) Linear Technology – I2C Controllable Buck Regulator with Two LDOs | |||
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LTC3445
ELECTRICAL CHARACTERISTICS The â denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC1 = VCC2 = 3.6V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
IS
Additional Input DC Bias Current For Buck (Note 4)
Active Mode
VOUT = 90%, ILOAD = 0A
Sleep Mode
VOUT = 103%, ILOAD = 0A
fOSC
Nominal Oscillator Frequency
VOUT = 100%
â
VOUT = 0V
RPFET
RDS(ON) of P-Channel FET
ISW = 100mA
RNFET
RDS(ON) of N-Channel FET
ISW = â100mA
ILSW
SW Leakage
VRUN = 0V, VSW = 0V or 5V, VCC1 = 5V
LDO1
IS
Additional DC Bias for LDO1
VOUT
Regulated Output Voltage
2.5V < VIN < 5.5V, 1mA < ILOAD < 50mA
VFB
LDO2
IS
VOUT
Line Regulation
Load Regulation
Dropout Voltage
LDO Feedback Voltage
Additional DC Bias for LDO2
Regulated Output Voltage
âVCC2 = 2.5V to 5.5V, ILOAD = 1mA, VOUT = 1.2V
VCC2 = 2.5V, âILOAD = 1mA to 50mA, VOUT = 1.2V
ILOAD = 50mA
ILOAD = 0mA
â
2.5V < VIN < 5.5V, 1mA < ILOAD < 50mA
Line Regulation
Load Regulation
Dropout Voltage
VFB
LDO Feedback Voltage
PowerPath Controller
VTRACK
Tracked Input Voltage
âVCC2 = 2.5V to 5.5V, ILOAD = 1mA, VOUT = 1.2V
VCC2 = 2.5V, âILOAD = 1mA to 50mA, VOUT = 1.2V
ILOAD = 50mA
ILOAD = 0mA
â
VTRACK â
VCC BATT
Tracked Output Voltage at VCC BATT
VBACKUP Backup Battery Voltage
IBACKUP
Backup Battery Bias Current
VCC BATT VCC BATT Output
IVCCBATT Max VCC BATT Output Current
BATTFAULT VCC1 High Level (Good)
VCC1 Low Level (Bad)
Hysteresis
I2C Interface
fI2C(MAX) Maximum I2C Operating Frequency
tBUF
Bus Free Time Between Stop and Start
Condition
tHD(RSTA)
Hold Time After (Repeated)
Start Condition
3V < VTRACK < VCC1 â 0.2V
VCC1 = VTRACK = 0V, VBACKUP = 2.5V
VTRACK = 0V, VCC1 = 4V, IVCCBAT = 8mA
VCC1 = 2.5V
Where BATTFAULT Goes High
Where BATTFAULT Goes Low
VCC1 = 0V to 4.2V, 4.2 to 0V
(Note 5)
(Note 5)
(Note 5)
MIN
1.2
0.582
0.582
0.582
0.582
3
â 0.2
2
2.85
2.65
2.4
TYP MAX
220
6
1.5 1.8
300
0.45
0.325
1
23
30
VCC2 â
0.3
1
5
15
0.3
0.6 0.618
23
30
VCC2 â
0.3
1
5
15
0.3
0.6 0.618
VCC1 â
0.2
0
0.2
5.5
4
6.5
3
3.1
8
2.8 2.9
2.5 2.6
0.3
400
1.3
600
UNITS
µA
µA
MHz
kHz
â¦
â¦
µA
µA
V
mV
mV
V
V
µA
V
mV
mV
V
V
V
V
V
µA
V
mA
V
V
V
kHz
µs
ns
3445fa
3
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