NCP1402_06 ONSEMI [ON Semiconductor], NCP1402_06 Datasheet - Page 17

• Manufacturer Part Number: NCP1402_06
• Description: 200 mA, PFM Step−Up Micropower Switching Regulator
• Manufacturer: ONSEMI [ON Semiconductor]

PCB Layout Hints
Grounding
return ground, the input power return ground, and the device
switch ground to reduce noise as shown in Figure 62, e.g.:
C2 GND, C1 GND, and U1 GND are connected at one point
in the evaluation board. The input ground and output ground
traces must be thick enough for current to flow through and
for reducing ground bounce.
Power Signal Traces
power carrying traces to reduce power loss so as to improve
Components Supplier
Inductor, L1
Schottky Diode, D1
Output Capacitor, C2
Input Capacitor, C1
One point grounding should be used for the output power
Low resistance conducting paths should be used for the
Parts
GND
10 mF/16 V
V
in
TP1
TP4
Sumida Electric Co. Ltd.
ON Semiconductor Corp.
KEMET Electronics Corp. T494D686K010AS
KEMET Electronics Corp. T491C106K016AS
C1
Figure 62. NCP1402 Evaluation Board Schematic Diagram
Supplier
+
Enable
JP1
On
Off
MBR0520LT1
Part Number
CD54−470L
http://onsemi.com
OUT
NC
CE
2
1
3
NCP1402
NCP1402
47 mH
17
L1
efficiency (short and thick traces for connecting the inductor
L can also reduce stray inductance), e.g.: short and thick
traces listed below are used in the evaluation board:
Output Capacitor
terminals to obtain better smoothing effect on the output
ripple.
The output capacitor should be placed close to the output
Inductor 47 mH / 0.72 A
Schottky Power Rectifier
Low ESR Tantalum Capacitor
68 mF / 10 V
Low Profile Tantalum Capacitor
10 mF / 16 V
1. Trace from TP1 to L1
2. Trace from L1 to Lx pin of U1
3. Trace from L1 to anode pin of D1
4. Trace from cathode pin of D1 to TP2
GND
LX
5
6
D1
MBR0520LT1
Description
+
C2
68 mF/10 V
TP2
TP3
V
GND
out
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(852)−2305−1168
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