LTC3406B-2ES5#TRM Linear Technology, LTC3406B-2ES5#TRM Datasheet - Page 11

• Manufacturer Part Number: LTC3406B-2ES5#TRM
• Description: IC SYNC BUCK REG 600MA TSOT23-5
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC3406B-2ES5#TRM

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 5.5 V
• Current - Output: 600mA
• Frequency - Switching: 2.25MHz
• Voltage - Input: 2.5 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-5, TSOT-5, TSOP-5
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Other names: LTC3406B-2ES5; LTC3406B-2ES5

APPLICATIO S I FOR ATIO
A second, more severe transient is caused by switching in
loads with large (>1µF) supply bypass capacitors. The
discharged bypass capacitors are effectively put in parallel
with C
deliver enough current to prevent this problem if the load
switch resistance is low and it is driven quickly. The only
solution is to limit the rise time of the switch drive so that
the load rise time is limited to approximately (25 • C
Thus, a 10µF capacitor charging to 3.3V would require a
250µs rise time, limiting the charging current to about
130mA.
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
OUT
, causing a rapid drop in V
U
U
V
OUT
W
OUT
V
OUT
L1
. No regulator can
BOLD LINES INDICATE HIGH CURRENT PATHS
–
+
Figure 6. LTC3406B-2 Suggested Layout
Figure 5. LTC3406B-2 Layout Diagram
SW
PIN 1
C
U
OUT
L1
C
OUT
LOAD
1
2
3
LTC3406B-2
RUN
SW
LTC3406B-2
GND
GND
).
VIA TO V
V
V
LTC3406B-2. These items are also illustrated graphically
in Figures 5 and 6. Check the following in your layout:
1. The power traces, consisting of the GND trace, the SW
2. Does the V
3. Does the (+) plate of C
4. Keep the switching node, SW, away from the sensitive
5. Keep the (–) plates of C
C
IN
FB
IN
IN
C
IN
trace and the V
wide.
resistors? The resistive divider R1/R2 must be con-
nected between the (+) plate of C
possible? This capacitor provides the AC current to the
internal power MOSFETs.
V
5
4
FB
node.
C
R1
R2
R2
FWD
VIA TO GND
FB
C
3406B F05
FWD
IN
pin connect directly to the feedback
trace should be kept short, direct and
R1
V
+
–
V
IN
3406B F06
IN
IN
IN
and C
connect to V
VIA TO V
OUT
OUT
OUT
LTC3406B-2
as close as possible.
and ground.
IN
as closely as
sn3406b2 3406b2fs
11