LTC3547 Datasheet, PDF (2/16 Pages) Linear Technology – Dual Monolithic 300mA Synchronous Step-Down Regulator

LTC3547
ABSOLUTE AXI U RATI GS
(Note 1)
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
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V_FB1 1
8 V_FB2
RUN1 2
7 RUN2
9
V_IN 3
6 SW2
SW1 4
5 GND
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 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 specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS 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.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_IN
V_UV
I_FB
V_FBREG1
V_FBREG2
ΔV_LINEREG
ΔV_LOADREG
I_S
f_OSC
V_IN Operating Voltage
V_IN Undervoltage Lockout
Feedback Pin Input Current
Regulated Feedback Voltage (V_FB1)
Regulated Feedback Voltage (V_FB2)
Reference Voltage Line Regulation
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
● 2.5
5.5
V
●
2.0
2.5
V
●
30
nA
●
3
6
µA
0.590 0.600 0.610
V
● 0.588 0.600 0.612
V
1.770 1.800 1.830
V
● 1.764 1.800 1.836
V
0.590 0.600 0.610
V
● 0.588 0.600 0.612
V
1.180 1.200 1.220
V
● 1.176 1.200 1.224
V
0.3
0.5
%/V
Output Voltage Load Regulation
I_LOAD = 0mA to 300mA
0.5
%
Input DC Supply Current
Active Mode (Note 3)
Sleep Mode
Shutdown
Oscillator Frequency
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
700
µA
40
60
µA
0.1
1
µA
V_FB = 0.6V
● 1.8
2.25
2.7
MHz
I_LIM
Peak Switch Current Limit
V_IN = 3V, V_FB < V_FBREG, Duty Cycle < 35%
Channel 1 (300mA)
400 550
mA
Channel 2 (300mA)
400 550
mA
3547fa
2