LTC3447 Ver la hoja de datos (PDF) - Linear Technology
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LTC3447 Datasheet PDF : 16 Pages
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LTC3447
ABSOLUTE AXI U RATI GS
(Note 1)
VIN, VCCD Voltages ....................................... –0.3V to 6V
RUN, VOUT, FB Voltages .............................. – 0.3V to VIN
SW Voltage ................................... –0.3V to (VIN + 0.3V)
SCL, SDA Voltages................................... – 0.3V to VCCD
P-Channel Switch Source Current (DC) ...............800mA
N-Channel Switch Sink Current (DC) ...................800mA
Peak SW Sink and Source Current ...........................1.3A
Operating Temperature Range (Note 2) ...–40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
Storage Temperature Range...................–65°C to 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VOUT 1
GND 2
FB 3
PGOOD 4
VIN 5
10 SDA
9 VCCD
11
8 SCL
7 RUN
6 SW
DD PACKAGE
10-LEAD (3mm x 3mm)PLASTIC DFN
EXPOSED PAD IS GND (PIN 11)
MUST BE SOLDERED TO PCB
TJMAX = 125°C, θJA = 43°C/W, θJC = 2.96°C/W
ORDER PART
NUMBER
LTC3447EDD
DD PART
MARKING
LBKB
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
RUN
Run Threshold
0.3
1
1.5
PGOOD
Reports Undervoltage
PGOOD = 0.4V
3
RVOUT
VOUT(MIN)
VOUT(MAX)
VOUT
Feedback Resistance
Regulated Output Voltage
Regulated Output Voltage
Output Voltage Step Size (6-bits)
460
● 0.669 0.69 0.711
● 1.989 2.05 2.112
● 20.3 21.6 22.9
ΔVOUT
Output Voltage Line Regulation
VIN = 2.5V to 5.5V (Note 6)
●
0.2
1.2
0.2
1
IPK
VLOADREG
VIN
IS
fOSC
RPFET
RNFET
ILSW
FB
Peak Inductor Current
Output Voltage Load Regulation
Input Voltage Range
Input DC Bias Current
Burst Mode Operation
Active Mode
Shutdown
Nominal Oscillator Frequency
RDS(ON) of P-Channel FET
RDS(ON) of N-Channel FET
SW Leakage
Optional Start-Up Feedback Voltage
Duty Cycle < 35%, Wafer Level
(Note 4)
ILOAD = 0A
VOUT = 90%, ILOAD = 0A
VRUN = 0V, VIN = 5.5V
VOUT = 100%
VOUT = 0V
ISW = 100mA, Wafer Level
ISW = –100mA, Wafer Level
VRUN = 0V, VSW = 0V or 5V, VIN = 5V
Regulated Feedback Voltage
0.75
1
1.25
0.5
● 2.5
5.5
34
60
280
400
0.1
1
● 0.7
1
1.3
160
0.32
0.22
±0.1
±1
0.6
IFB
SCLTHR
SCLHYST
SDATHR
SDAHYST
Feedback Input Current
I2C Clock Logic Threshold
I2C Clock Logic Hysteresis
I2C Data Logic Threshold
I2C Data Logic Hysteresis
(Note 5)
(Note 5)
(Note 5)
(Note 5)
2.5
10
VCCD/2
300
VCCD/2
300
UNITS
V
mA
kΩ
V
V
mV
%/V
%/V
A
%
V
µA
µA
µA
MHz
kHz
Ω
Ω
µA
V
nA
V
mV
V
mV
3447f
2
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