Datasheet

LTC3549
2
3549f
Input Supply Voltage ................................... –0.3V to 6V
RUN, V
FB
, MODE Voltages .............–0.3V to (V
IN
+ 0.3V)
SW Voltage < 100ns Pulse .............–0.3V to (V
IN
+ 0.3V)
Operating Temperature Range (Note 2) ... –40°C to 85°C
Junction Temperature (Note 3) ........................... 125°C
Storage Temperature Range .................. –65°C to 125°C
(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
= 2.2V.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range
●
1.6 5.5 V
V
RUN
RUN Threshold
●
0.3 0.7 1.1 V
I
RUN
RUN Leakage Current V
RUN
= 0 or 2.2V 0.01 1 µA
V
MODE
MODE Threshold
●
0.3 0.65 1.1 V
I
MODE
MODE Leakage Current V
MODE
= 0 or 2.2V 0.01 1 µA
V
FB
Regulated Feedback Voltage T
A
= 25°C (Note 4)
0°C ≤ T
A
≤ 85°C (Note 4)
–40°C ≤ T
A
≤ 85°C (Note 4)
●
0.599
0.597
0.596
0.611
0.611
0.611
0.623
0.623
0.626
V
V
V
I
VFB
Feedback Current
●
±30 nA
ΔV
OVL
ΔV
FBOVL
Overvoltage Lockout ΔV
OVL
= ΔV
FBOVL
– V
FB
(Note 6) 40 60 80 mV
ΔV
FB
Reference Voltage Line Regulation 1.6V < V
IN
< 5.5V (Note 4)
●
0.04 0.4 %/V
ΔV
OUT
Output Voltage Line Regulation I
OUT
= 100mA, 1.6V < V
IN
< 5.5V (Note 7) 0.04 0.4 %/V
I
PK
Peak Inductor Current V
FB
= 0.5V or V
OUT
= 90% 0.3 0.45 0.6 A
V
LOADREG
Output Voltage Load Regulation Pulse Skip Mode, V
OUT
= 1.2V,
50mA < I
LOAD
< 250mA (Note 7)
0.5 %
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
TOP VIEW
V
FB
RUN MODE
V
IN
GND
SW
DCB PACKAGE
6-LEAD (2mm × 3mm) PLASTIC DFN
4
5
7
6
3
2
1
T
JMAX
= 125°C, θ
JA
= 64°C/W
EXPOSED PAD (PIN 7) IS GND
MUST BE SOLDERED TO PCB
ORDER PART NUMBER DCB PART MARKING
LTC3549EDCB LBZR
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.