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LTC3549 Datasheet, PDF (2/16 Pages) Linear Technology – 250mA Low VIN Buck Regulator in 2mm × 3mm DFN
◁
LTC3549
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage................................... –0.3V to 6V
RUN, VFB, MODE Voltages .............–0.3V to (VIN + 0.3V)
SW Voltage < 100ns Pulse.............–0.3V to (VIN + 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
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
654
7
123
DCB PACKAGE
6-LEAD (2mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 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 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 = 2.2V.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN
VRUN
IRUN
VMODE
IMODE
VFB
IVFB
ΔVOVL
ΔVFB
ΔVOUT
IPK
Input Voltage Range
● 1.6
5.5
V
RUN Threshold
● 0.3
0.7
1.1
V
RUN Leakage Current
MODE Threshold
VRUN = 0 or 2.2V
0.01
1
µA
● 0.3
0.65
1.1
V
MODE Leakage Current
Regulated Feedback Voltage
Feedback Current
VMODE = 0 or 2.2V
TA = 25°C (Note 4)
0°C ≤ TA ≤ 85°C (Note 4)
–40°C ≤ TA ≤ 85°C (Note 4)
0.01
1
µA
● 0.599 0.611 0.623
V
0.597 0.611 0.623
V
0.596 0.611 0.626
V
●
±30
nA
ΔVFBOVL Overvoltage Lockout
ΔVOVL = ΔVFBOVL – VFB (Note 6)
40
60
80
mV
Reference Voltage Line Regulation
1.6V < VIN < 5.5V (Note 4)
●
0.04 0.4
%/V
Output Voltage Line Regulation
IOUT = 100mA, 1.6V < VIN < 5.5V (Note 7)
0.04 0.4
%/V
Peak Inductor Current
VFB = 0.5V or VOUT = 90%
0.3 0.45 0.6
A
VLOADREG
Output Voltage Load Regulation
Pulse Skip Mode, VOUT = 1.2V,
50mA < ILOAD < 250mA (Note 7)
0.5
%
3549f
2
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