Datasheet LTC3447 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | I2C Controllable Buck Regulator in 3mm × 3mm DFN |
| Pages / Page | 16 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| File Format / Size | PDF / 578 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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LTC3447
ELECTRICAL CHARACTERISTICS The
●
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 3.6V unless otherwise specifi ed. SYMBOL PARAMETER CONDITION MIN TYP MAX UNITS I2C Interface Timing
fI2C, MAX Maximum I2C Operating Frequency (Note 5) 400 kHz tBUF Bus Free Time Between Stop and Start Condition (Note 5) 1.3 µs tHD,RSTA Hold Time After (Repeated) Start Condition (Note 5) 0.6 µs tSU,RSTA Repeated Start Condition Setup Time (Note 5) 0.6 µs tSU,STOP Stop Condition Setup Time (Note 5) 20 µs tHD,DIN Data Hold Time, Input (Note 5) 0 ns tHD,DOUT Data Hold Time, Output (Note 5) 280 410 670 ns tSU,DAT Data Setup Time (Note 5) 50 ns tSP Pulse Width of Spikes (Note 5) 150 ns Suppressed by Input Filter
Note 1:
Absolute Maximum Ratings are those values beyond which the life This IC includes overtemperature protection that is intended to protect of a device may be impaired. the device during momentary overload conditions. Junction temperature
Note 2:
The LTC3447E is guaranteed to meet performance specifi cations will exceed 125°C when overtemperature protection is active. Continuous from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating operation above the specifi ed maximum operating junction temperature temperature are assured by design, characterization and correlation with may impair device reliability. statistical process controls.
Note 4:
Dynamic supply current is higher due to gate charge being
Note 3:
T delivered at the switching frequency. J is calculated from the ambient temperature, TA, and the power dissipation, PD, according to the following formula:
Note 5:
Determined by design, not production tested. TJ = TA + PD • 43°C/W
Note 6:
The LTC3447 is tested in a proprietary test mode that connects VOUT to FB.
W U W TI I G DIAGRA
SDA t t t SU, DAT SU, STA BUF tHD, DAT tHD, STA tSU, STO tLOW SCL tHD, STA tHIGH tr tf START REPEATED STOP START COMMAND START COMMAND COMMAND COMMAND 3447 F01
Figure 1. Timing Diagram
3447f 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 3.6V unless otherwise specifi ed. SYMBOL PARAMETER CONDITION MIN TYP MAX UNITS I2C Interface Timing
fI2C, MAX Maximum I2C Operating Frequency (Note 5) 400 kHz tBUF Bus Free Time Between Stop and Start Condition (Note 5) 1.3 µs tHD,RSTA Hold Time After (Repeated) Start Condition (Note 5) 0.6 µs tSU,RSTA Repeated Start Condition Setup Time (Note 5) 0.6 µs tSU,STOP Stop Condition Setup Time (Note 5) 20 µs tHD,DIN Data Hold Time, Input (Note 5) 0 ns tHD,DOUT Data Hold Time, Output (Note 5) 280 410 670 ns tSU,DAT Data Setup Time (Note 5) 50 ns tSP Pulse Width of Spikes (Note 5) 150 ns Suppressed by Input Filter
Note 1:
Absolute Maximum Ratings are those values beyond which the life This IC includes overtemperature protection that is intended to protect of a device may be impaired. the device during momentary overload conditions. Junction temperature
Note 2:
The LTC3447E is guaranteed to meet performance specifi cations will exceed 125°C when overtemperature protection is active. Continuous from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating operation above the specifi ed maximum operating junction temperature temperature are assured by design, characterization and correlation with may impair device reliability. statistical process controls.
Note 4:
Dynamic supply current is higher due to gate charge being
Note 3:
T delivered at the switching frequency. J is calculated from the ambient temperature, TA, and the power dissipation, PD, according to the following formula:
Note 5:
Determined by design, not production tested. TJ = TA + PD • 43°C/W
Note 6:
The LTC3447 is tested in a proprietary test mode that connects VOUT to FB.
W U W TI I G DIAGRA
SDA t t t SU, DAT SU, STA BUF tHD, DAT tHD, STA tSU, STO tLOW SCL tHD, STA tHIGH tr tf START REPEATED STOP START COMMAND START COMMAND COMMAND COMMAND 3447 F01
Figure 1. Timing Diagram
3447f 3
