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LTC3445 Datasheet(PDF) 3 Page - Linear Technology

Part # LTC3445
Description  I2C Controllable Buck Regulator with Two LDOs in a 4mm 횞 4mm QFN
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3445 Datasheet(HTML) 3 Page - Linear Technology

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



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