3.7V lithium battery boost to 5v1a, fs2114 boost conversion chip design layout

FS2114 Of PCB Layout design suggestions - The basic chapter
A common problem with switching power supply is “ unstable ” Switching waveform . Sometimes , Obvious waveform jitter , Noise can be heard from the magnetic elements
The sound . If the problem is with the PCB （PCB） Layout related , It is difficult to determine the cause . EMC Also pay attention to （PCB） Layout , This is for
What is the correct layout in the early stage of switching power supply design PCB The crucial reason . Its importance cannot be overstated .
Schematic wiring
Placement of main components
Connect a bypass capacitor in parallel 0.1uF
LX node
FB Feedback resistance R1,R2
COUT capacitance
Easy to affect the output wiring
Recommended pad patterns for power components
GND Power ground PCB wiring
Inductor selection

summary
FS2114 Yes, boost DC-DC converter . Built in 0.2Ω power MOSFET Of PWM circuit , So that the regulator has high efficiency . The internal compensation network can also
Less 6 Number of external components . 0.6V Precision reference voltage , The internal soft start function can reduce the surge current . FS2114 use SOT23-6L encapsulation , Save space for applications
between PCB.
characteristic ：
l Adjustable output up to 12V
l Internal fixation PWM frequency ： 1.0MHz
l Accurate feedback reference voltage ： 0.6V（±2%）
l Inside 0.2Ω、 2.5A、 16V power MOSFET
l Shutdown current ： 0.1μA
l Over temperature protection
l Over voltage protection
l Adjustable overcurrent protection ： 0.5A~2.5A（ Input end ）
Schematic wiring
• Good layout design optimizes power efficiency , Reduce thermal stress , most important of all , Minimize noise and interaction between wiring and components .
• To begin PCB Before the layout , A good practice is to highlight the schematic wiring of high current wiring , Flat core micro products Datasheet In a typical application circuit , special
Marked prominently for customer reference ： Black thick line .
Placement of main components
• Switching power supply circuit can be divided into power stage circuit and small signal control circuit . The power stage circuit consists of components that conduct large currents . Usually , These components should be placed first
(PW5300 chip , L1, D1, CIN and COUT). Then, the small signal control circuit FB Place in a specific location in the layout . The high current wiring of inductance shall be short and wide , With the most
Miniaturization PCB inductance , Resistance and voltage drop .
• CIN Need to approach PW5300 Of VIN Pin PIN5, It is not recommended to place on the back of the via . COUT When conditions are limited , It can be placed on the back of the through hole .