ADVANCED INFORMATION
APPLICATION INFORMATION
TK654xx
LBO
OUT
SW
LBI
LBO
OUT
SW
SB
STANDBY
V
GND
V
GND
V
IN
V
IN
V
= 5 V
V
= 3 V
IN
V
= 5 V
IN
OUT
V
= 3 V
OUT
L
1
L
1
100 µH
100 µH
C
1
C
1
22 µF
22 µF
FIGURE 6: MINIMUM DEVICE COUNT
FIGURE 7: CONVERTER WITH STANDBY
V
= 5 V
IN
V
= 5 V
IN
R
1
634 K
R
R
1
3
R
3
634 K
300 k
300 k
LBO
OUT
SW
LBI
LBO
OUT
SW
LBI
LB OUT
LB OUT
R
V
2
GND
R
V
2
GND
287 K
287 K
V
IN
V
IN
V
= 3 V
OUT
V
= 3 V
OUT
L
1
L
1
100 µH
100 µH
C
1
C
1
D
1
(optional)
C
2
22 µF
20 µF
10 µF
FIGURE 8: LOW BATTERY DETECTOR
FIGURE 9: EVALUATION BOARD SCHEMATIC
VOUT
VIN
VOUT
GND
VIN
GND
C1
C1
C2
L1
*
*D Optional
1
LBO
LBO
FIGURE 9C: EVALUATION BOARD COMPONENT
PLACEMENT
FIGURE 9B: EVALUATION BOARD ARTWORK
September 1999 TOKO, Inc.
Page 19
TOKO [ TOKO, INC ]
