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LTC3447

3447f

ABSOLUTE

AXI U

RATI GS

FOR ATIO

PACKAGE/ORDER I

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

RUN

Run Threshold

0.3

1.5

PGOOD

Reports Undervoltage

PGOOD = 0.4V

RVOUT

Feedback Resistance

460

kΩ

VOUT(MIN)

Regulated Output Voltage

●

0.669

0.69

0.711

VOUT(MAX)

Regulated Output Voltage

●

1.989

2.05

2.112

VOUT

Output Voltage Step Size (6-bits)

●

20.3

21.6

22.9

ΔVOUT

Output Voltage Line Regulation

VIN = 2.5V to 5.5V (Note 6)

●

0.2

1.2

%/V

0.2

%/V

IPK

Peak Inductor Current

Duty Cycle < 35%, Wafer Level

0.75

1.25

VLOADREG

Output Voltage Load Regulation

0.5

VIN

Input Voltage Range

●

2.5

5.5

Input DC Bias Current

(Note 4)

Burst Mode Operation

ILOAD = 0A

µA

Active Mode

VOUT = 90%, ILOAD = 0A

280

400

µA

Shutdown

VRUN = 0V, VIN = 5.5V

0.1

µA

fOSC

Nominal Oscillator Frequency

VOUT = 100%

●

0.7

1.3

MHz

VOUT = 0V

160

kHz

RPFET

RDS(ON) of P-Channel FET

ISW = 100mA, Wafer Level

0.32

RNFET

RDS(ON) of N-Channel FET

ISW = –100mA, Wafer Level

0.22

ILSW

SW Leakage

VRUN = 0V, VSW = 0V or 5V, VIN = 5V

±0.1

±1

µA

Optional Start-Up Feedback Voltage

Regulated Feedback Voltage

0.6

IFB

Feedback Input Current

2.5

SCLTHR

I2C Clock Logic Threshold

(Note 5)

VCCD/2

SCLHYST

I2C Clock Logic Hysteresis

(Note 5)

300

SDATHR

I2C Data Logic Threshold

(Note 5)

VCCD/2

SDAHYST

I2C Data Logic Hysteresis

(Note 5)

300

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

ORDER PART

NUMBER

DD PART

MARKING

TJMAX = 125°C, θJA = 43°C/W, θJC = 2.96°C/W

Consult LTC Marketing for parts speciﬁed with wider operating temperature ranges.

LBKB

LTC3447EDD

(Note 1)

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.

TOP VIEW

SDA

VCCD

SCL

RUN

VOUT

GND

PGOOD

VIN

DD PACKAGE

10-LEAD (3mm x 3mm)PLASTIC DFN

EXPOSED PAD IS GND (PIN 11)

MUST BE SOLDERED TO PCB

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