LTC3549EDCB#TRPBF Linear Technology, LTC3549EDCB#TRPBF Datasheet - Page 7

• Manufacturer Part Number: LTC3549EDCB#TRPBF
• Description: IC REG BUCK 250MA 6-DFN
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC3549EDCB#TRPBF

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.61 ~ 5.5 V
• Current - Output: 250mA
• Frequency - Switching: 2.25MHz
• Voltage - Input: 1.6 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 6-DFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

PI FU CTIO S
V
to GND, Pins 2 and 7, with a 4.7µF or greater ceramic
capacitor.
GND (Pin 2): N/C. Ground this pin.
SW (Pin 3): Switch Node Connection to Inductor. This pin
connects to the drains of the internal main and synchronous
power MOSFET switches.
MODE (Pin 4): Mode Select Input. To select pulse-skip-
ping mode, force this pin above 1.1V. Forcing this pin
below 0.3V selects Burst Mode operation. Do not leave
MODE fl oating.
FU CTIO AL DIAGRA
MODE
IN
RUN
V
4
6
5
FB
U
(Pin 1): Main Supply Pin. Must be closely decoupled
U
REFERENCE
U
V
IN
U
SHUTDOWN
OSCILLATOR
U
0.611V
0.671
START
SOFT-
+
+
OVDET
–
–
EA
SLOPE
COMP
W
OV
–
+
OSC
0.4V
RUN (Pin 5): Run Control Input. Forcing this pin above 1.1V
enables the part. Forcing this pin below 0.3V shuts down
the device. In shutdown, all functions are disabled drawing
<1µA supply current. Do not leave RUN fl oating.
V
from an external resistive divider across the output.
GND (Pin 7): Exposed Pad. The Exposed Pad is ground. It
must be soldered to PCB ground to provide both electrical
contact and optimum thermal performance.
RS LATCH
+
–
FB
S
R
BURST
EN
(Pin 6): Feedback Pin. Receives the feedback voltage
Q
Q
SLEEP
SWITCHING
BLANKING
CIRCUIT
LOGIC
AND
0.65V
–
I
SHOOT-
COMP
THRU
ANTI-
I
RCMP
+
–
+
LTC3549
5Ω
3549 FD
1
3
2
7
V
SW
GND
GND
7
IN
3549f