NCP1410_05 Datasheet, PDF (11/14 Pages) ON Semiconductor – 250 mA Sync-Rect PFM Step-Up DC-DC Converter with Low-Battery Detector

NCP1410
Components Placement
Power components, i.e. input capacitor, inductor and
output capacitor, must be placed as close together as
possible. All connecting traces must be short, direct and
thick. High current flowing and switching paths must be
kept away from the feedback (FB, pin 1) terminal to avoid
unwanted injection of noise into the feedback path.
Feedback Network
Feedback of the output voltage must be a separate trace
detached from the power path. External feedback network
must be placed very close to the feedback (FB, pin 1) pin and
sensing the output voltage directly at the anode of the output
capacitor.
TYPICAL APPLICATION CIRCUIT
V_IN = 1.8 V to 3.0 V
V_BATT
R_FB1
355 K
C_FB
150 pF
L
22 mH
GND
+ ^CIN
10 mF/
10 V
R_LB1
225 K
R_LB2
330 K
R_FB2
200 K
1 _FB
V_OUT ⁸
2 LBI _NCP1410 LX 7
3 LBO
GND 6
4 _REF
C_REF
150 nF
SHDN ⁵
V_OUT = 3.3 V/250 mA max.
V_OUT
R_SHDN
560 K
+ ^COUT
33 mF/
10 V
C_SHDN
56 nF
GND
Figure 28. Typical Application Schematic for 2 Alkaline Cells Supply
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