Datasheet

LTC3447
2
3447f
ABSOLUTE AXI U RATI GS
W
WW
U
FOR ATIOPACKAGE/ORDER I
UUW
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RUN Run Threshold 0.3 1 1.5 V
PGOOD Reports Undervoltage PGOOD = 0.4V 3 mA
R
VOUT
Feedback Resistance 460 kΩ
V
OUT(MIN)
Regulated Output Voltage ● 0.669 0.69 0.711 V
V
OUT(MAX)
Regulated Output Voltage ● 1.989 2.05 2.112 V
V
OUT
Output Voltage Step Size (6-bits) ● 20.3 21.6 22.9 mV
ΔV
OUT
Output Voltage Line Regulation V
IN
= 2.5V to 5.5V (Note 6) ● 0.2 1.2 %/V
0.2 1 %/V
I
PK
Peak Inductor Current Duty Cycle < 35%, Wafer Level 0.75 1 1.25 A
V
LOADREG
Output Voltage Load Regulation 0.5 %
V
IN
Input Voltage Range ● 2.5 5.5 V
I
S
Input DC Bias Current (Note 4)
Burst Mode Operation I
LOAD
= 0A 34 60 µA
Active Mode V
OUT
= 90%, I
LOAD
= 0A 280 400 µA
Shutdown V
RUN
= 0V, V
IN
= 5.5V 0.1 1 µA
f
OSC
Nominal Oscillator Frequency V
OUT
= 100% ● 0.7 1 1.3 MHz
V
OUT
= 0V 160 kHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 100mA, Wafer Level 0.32 Ω
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –100mA, Wafer Level 0.22 Ω
I
LSW
SW Leakage V
RUN
= 0V, V
SW
= 0V or 5V, V
IN
= 5V ±0.1 ±1 µA
FB Optional Start-Up Feedback Voltage Regulated Feedback Voltage 0.6 V
I
FB
Feedback Input Current 2.5 10 nA
SCL
THR
I
2
C Clock Logic Threshold (Note 5) V
CCD/2
V
SCL
HYST
I
2
C Clock Logic Hysteresis (Note 5) 300 mV
SDA
THR
I
2
C Data Logic Threshold (Note 5) V
CCD/2
V
SDA
HYST
I
2
C Data Logic Hysteresis (Note 5) 300 mV
V
IN
, V
CCD
Voltages .......................................–0.3V to 6V
RUN, V
OUT
, FB Voltages .............................. –0.3V to V
IN
SW Voltage ................................... –0.3V to (V
IN
+ 0.3V)
SCL, SDA Voltages ...................................– 0.3V to V
CCD
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
T
JMAX
= 125°C, θ
JA
= 43°C/W, θ
JC
= 2.96°C/W
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
LBKB
LTC3447EDD
(Note 1)
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V unless otherwise specifi ed.
TOP VIEW
10
9
6
7
811
4
5
3
2
1
SDA
V
CCD
SCL
RUN
SW
V
OUT
GND
FB
PGOOD
V
IN
DD PACKAGE
10-LEAD (3mm x 3mm)PLASTIC DFN
EXPOSED PAD IS GND (PIN 11)
MUST BE SOLDERED TO PCB