LTC3547
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V
FB1
1
RUN1 2
V
IN
3
SW1 4
9
8 V
FB2
7 RUN2
6 SW2
5 GND
V
IN
............................................................... –0.3V to 6V
V
FB1
, V
FB2
......................................... –0.3V to V
IN
+0.3V
RUN1, RUN2 ..................................... –0.3V to V
IN
+0.3V
SW1, SW2 (DC) ................................ –0.3V to V
IN
+0.3V
P-Channel Switch Source Current (DC) ...............500mA
N-Channel Switch Sink Current (DC) ...................500mA
Peak SW Sink and Source Current (Note 5) .........700mA
Ambient Operating Temperature Range ... –40°C to 85°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range................... –65°C to 125°C
DDB PACKAGE
8-LEAD (3mm
×
2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 76°C/W
EXPOSED PAD (PIN 9) IS GND MUST BE SOLDERED TO PCB
ORDER PART NUMBER
LTC3547EDDB
LTC3547EDDB-1
DDB PART MARKING
LCDP
LCPC
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
V
UV
I
FB
V
FBREG1
PARAMETER
V
IN
Operating Voltage
V
IN
Undervoltage Lockout
Feedback Pin Input Current
Regulated Feedback Voltage (V
FB1
)
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, unless otherwise noted.
CONDITIONS
●
MIN
2.5
●
●
●
●
●
●
●
TYP
2.0
3
MAX
5.5
2.5
30
6
0.610
0.612
1.830
1.836
0.610
0.612
1.220
1.224
0.5
UNITS
V
V
nA
µA
V
V
V
V
V
V
V
V
%/V
%
V
IN
Low to High
LTC3547, V
FB
= V
FBREG
LTC3547-1, V
FB
= V
FBREG
LTC3547, 0°C ≤ T
A
≤ 85°C
LTC3547, –40°C ≤ T
A
≤ 85°C
LTC3547-1, 0°C ≤ T
A
≤ 85°C
LTC3547-1, –40°C ≤ T
A
≤ 85°C
LTC3547, 0°C ≤ T
A
≤ 85°C
LTC3547, –40°C ≤ T
A
≤ 85°C
LTC3547-1, 0°C ≤ T
A
≤ 85°C
LTC3547-1, –40°C ≤ T
A
≤ 85°C
V
IN
= 2.5V to 5.5V
I
LOAD
= 0mA to 300mA
V
FB1
= V
FB2
= 0.95V
×
V
FBREG
V
FB1
= V
FB2
= 1.05V
×
V
FBREG
, V
IN
= 5.5V
RUN1 = RUN2 = 0V, V
IN
= 5.5V
V
FB
= 0.6V
V
IN
= 3V, V
FB
< V
FBREG
, Duty Cycle < 35%
0.590
0.588
1.770
1.764
0.590
0.588
1.180
1.176
0.600
0.600
1.800
1.800
0.600
0.600
1.200
1.200
0.3
0.5
450
40
0.1
V
FBREG2
Regulated Feedback Voltage (V
FB2
)
Δ
V
LINEREG
Δ
V
LOADREG
I
S
Reference Voltage Line Regulation
Output Voltage Load Regulation
Input DC Supply Current
Active Mode (Note 3)
Sleep Mode
Shutdown
Oscillator Frequency
Peak Switch Current Limit
Channel 1 (300mA)
Channel 2 (300mA)
700
60
1
2.7
f
OSC
I
LIM
●
1.8
400
400
2.25
550
550
3547fa
2
U
µA
µA
µA
MHz
mA
mA
W
U
U
W W
W
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
