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LTC3444 Datasheet(PDF) 13 Page - Linear Technology

Part # LTC3444
Description  Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3444 Datasheet(HTML) 13 Page - Linear Technology

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LTC3444
3444fb
Table 1. Shows some typical resistor value combinations
for several VCONTROL vs VOUT voltage ranges. One percent
(1%) resistor tolerances were assumed.
Table 1. Typical Resistor Values for VOUT vs VCONTROL
VCONTROL(V)
VOUT (V)
RESISTANCE (k
Ω)
MIN
MAX
MIN
MAX
R1
R2
R3
0.35
2.4
0.8
4.2
340
271
205
0.35
2.5
0.5
5.0
340
210
162
0.8
2.35
0.8
4.2
340
200
154
0.5
2.5
0.5
4.2
340
249
182
Figure 6. Recommended Component Placement
COMPONENT SELECTION
Recommended Component Placement
Figure 6. Shows a recommended component placement.
Traces carrying high current should be made short and
wide. Trace area at FB and VC pins should be minimized.
Lead lengths to the battery should be kept short. VOUT and
VIN ceramic capacitors should be placed close to the IC
pins. Multiple vias should be used between layers.
OPERATIO
3444 F06
VIN
VIN
VOUT
LTC3444
MULTIPLE VIAS
5
6
7
8
VOUT
VIN
VC
FB
4
3
2
1
SW2
GND
SW1
SHDN
VCONTROL



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