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KB3426 Datasheet(PDF) 13 Page - Kingbor Technology Co

Part # KB3426
Description  1.5MHz, 800mA Synchronous Step-Down Regulator in SOT23-5
PDF  16 Pages
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Manufacturer  KINGBOR [Kingbor Technology Co]
Direct Link  http://www.kingbor.com
Logo KINGBOR - Kingbor Technology Co

KB3426 Datasheet(HTML) 13 Page - Kingbor Technology Co

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For the feedback resistors, choose R1 = 316k. R2 can
then be calculated from equation (2) to be:
R
V
Rk
OUT
2
06
1
1 1000
=
=
.
VIN
CIN
10
µF
Tan
VIN
2.7V
TO 6.5V
KB3426
RUN
3
4.7
µH
22pF
1M
316k
5
4
1
2
SW
VFB
GND
COUT**
10
µF
CER
VOUT
2.5V
** TAIYO YUDEN JMK316BJ106ML
Figure 7a
Figure 7b
Figure 7 shows the complete circuit along with its effi-
ciency curve.
OUTPUT CURRENT (mA)
70
80
85
95
100
0.1
10
100
1000
60
1
90
75
65
VOUT = 2.5V
VIN = 2.7V
VIN = 4.2V
VIN = 3.6V
Single Li-Ion 1.5V/800mA Regulator for
High Efficiency and Small Footprint
VIN
CIN
10
µF
Tan
VIN
2.7V
TO 6.5V
KB3426B-1.5
RUN
3
4.7
µH
5
4
1
2
SW
VOUT
GND
COUT1
†
10
µF
CER
VOUT
1.5V
†TAIYO YUDEN JMK316BJ106ML
OUTPUT CURRENT (mA)
70
80
90
95
0.1
10
100
1000
60
1
85
75
65
VOUT = 1.5V
VIN = 2.7V
VIN = 4.2V
VIN = 3.6V
IL
500mA/DIV
ILOAD
500mA/DIV
VOUT
100mV/DIV
AC COUPLED
20
µs/DIV
VIN = 3.6V
VOUT = 1.5V
ILOAD = 0A TO 800mA
IL
500mA/DIV
ILOAD
500mA/DIV
VOUT
100mV/DIV
AC COUPLED
20
µs/DIV
VIN = 3.6V
VOUT = 1.5V
ILOAD = 200mA TO 800mA
KB3426
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
APPLICATIONS INFORMATION
TYPICAL APPLICATION
+
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