Datasheet

LTC3547
2
3547fa
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
(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 noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
V
IN
Operating Voltage
●
2.5 5.5 V
V
UV
V
IN
Undervoltage Lockout V
IN
Low to High
●
2.0 2.5 V
I
FB
Feedback Pin Input Current LTC3547, V
FB
= V
FBREG
LTC3547-1, V
FB
= V
FBREG
●
●
3
30
6
nA
µA
V
FBREG1
Regulated Feedback Voltage (V
FB1
) 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
●
●
0.590
0.588
1.770
1.764
0.600
0.600
1.800
1.800
0.610
0.612
1.830
1.836
V
V
V
V
V
FBREG2
Regulated Feedback Voltage (V
FB2
) 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
●
●
0.590
0.588
1.180
1.176
0.600
0.600
1.200
1.200
0.610
0.612
1.220
1.224
V
V
V
V
ΔV
LINEREG
Reference Voltage Line Regulation V
IN
= 2.5V to 5.5V 0.3 0.5 %/V
ΔV
LOADREG
Output Voltage Load Regulation I
LOAD
= 0mA to 300mA 0.5 %
I
S
Input DC Supply Current
Active Mode (Note 3)
Sleep Mode
Shutdown
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
450
40
0.1
700
60
1
µA
µA
µA
f
OSC
Oscillator Frequency V
FB
= 0.6V
●
1.8 2.25 2.7 MHz
I
LIM
Peak Switch Current Limit
Channel 1 (300mA)
Channel 2 (300mA)
V
IN
= 3V, V
FB
< V
FBREG
, Duty Cycle < 35%
400
400
550
550
mA
mA
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
TOP VIEW
9
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
5
6
7
8
4
3
2
1V
FB1
RUN1
V
IN
SW1
V
FB2
RUN2
SW2
GND
T
JMAX
= 125°C, θ
JA
= 76°C/W
EXPOSED PAD (PIN 9) IS GND MUST BE SOLDERED TO PCB
ORDER PART NUMBER DDB PART MARKING
LTC3547EDDB
LTC3547EDDB-1
LCDP
LCPC
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.