LTC3543 Datasheet, PDF (2/16 Pages) Linear Technology – 600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum

LTC3543
ABSOLUTE AXI U RATI GS
(Note 1)
V_IN Voltage................................................... –0.3V to 6V
RUN, V_FB, MODE, CAP Voltages...................–0.3V to V_IN
SW Voltage ....................................–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
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
654
7
123
DCB PACKAGE
6-LEAD (2mm × 3mm) PLASTIC DFN
PIN 7 IS GND
T_JMAX = 125°C, θ_JA = 64°C/W
ORDER PART NUMBER DCB PART MARKING
LTC3543EDCB
LCCK
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
RUN
Run Threshold
0.3
1
1.5
V
V_FB
Regulated Feedback Voltage
(Note 4)
● 0.588 0.6 0.612
V
I_VFB
Feedback Pin Current
1
µA
I_PK
Peak Inductor Current
V_IN = 3.6V, V_FB = 0V
0.7
1
1.3
A
V_LOADREG
Output Voltage Load Regulation
0.5
%/mA
V_LINEREG
V_IN
Output Voltage Line Regulation
Input Voltage Range
(Note 4)
● 2.5
0.5
%/V
5.5
V
I_S
Input DC Bias Current
Active Mode
Sleep Mode
Shutdown
(Note 5)
V_OUT = 90%, I_LOAD = 0A
V_OUT = 103%, I_LOAD = 0A
V_RUN = 0V, V_IN = 5.5V
f_OSC
Nominal Oscillator Frequency
375
500
µA
45
70
µA
0.1
1
µA
● 1.80 2.25
MHz
R_PFET
R_DS(ON) of P-Channel FET
I_SW = 100mA
0.45
Ω
R_NFET
R_DS(ON) of N-Channel FET
I_SW = 100mA
0.35
Ω
I_SW
SW Leakage
V_RUN = 0V, V_SW = 0V or 5.5V, V_IN = 5.5V
±1
µA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3543E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature ranges are assured by design, characterization and correlation
with statistical process controls.
Note 3: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula: T_J = T_A + (P_D)(64°C/W)
Note 4: The LTC3543 is tested in a proprietary test mode that connects
V_FB to the output of the error amplifier. This test mode is equivalent to
continuous mode operation.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
3543f
2