AK7903 Datasheet, PDF (8/10 Pages) Asahi Kasei Microsystems – DCDC Step-down Converter for NiH2 Battery

[AK7903]
SYSTEM DESIGN AND RECOMMENDED PARTS
AK7903
Bulk
VIN
Ci=1µF
Current Limit
COMP
PWM
Control
RT
ISET
EN1
VDD
OPOUT
TSD
Current
Monitor
SW3
SW1
SW2
SW
L=4.7µH
SENSE RES
Co=
10µF
GND
FB
SENSE
Battery pack
PIN1（Gain=3.75 times）
PIN2(Gain=1.96 times)
Ci=0.1µF
Figure 2.外部接続回路例
NIN
EN2 CONT
Recommend Parts :
Component
Symbol
Capacitance
Ci
Inductance
L
Capacitance
Co
Value
4.7uF
4.7uH
10uF
Type
C1608JB1E105K
LTF5022
C2012JB1C106K
*) Excellent DC bias characteristic of Ci is recommended.
Low value of Ci is possible to effect stability of AK7903.
Dimensions
1608 type (25v)
5.0×5.2×2.2
2012 type
Supplier
TDK
TDK
TDK
MS1190-E-00
8
2010/6