TM
MP2359 – 1.2A, 24V, 1.4MHz STEP-DOWN CONVERTER IN A TSOT23-6
Table 2—Suggested Surface Mount Inductors
Dimensions
Current
Rating (A)
Manufacturer
Part Number
Inductance(µH)
Max DCR(ꢀ)
L x W x H (mm3)
Toko
Sumida
Wurth Electronics
A921CY-4R7M
CDRH4D28C/LD
7440530047
4.7
4.7
4.7
0.027
0.036
0.038
1.66
1.5
2.0
6 x 6.3 x 3
5.1 x 5.1 x 3
5.8 x 5.8 x 2.8
TYPICAL APPLICATION CIRCUITS
D3
1N4148
(Optional)
5
1
6
3
V
IN
BS
IN
D2
1N4148
(Optional)
C3
22nF
4
V
OUT
3.3V
EN
SW
MP2359
OFF ON
D1
B230A-13-F
Notes:
1) D3 can be installed if V < 5V
IN
OUT
2) D2 can be installed if V
< 5V
FB
GND
3) No need for both D2 and D3
U1
Figure 3—1.4MHz, 3.3V Output at 1A Step-Down Converter
5
1
6
V
IN
BST
SW
IN
6V-12V
C3
10nF
D1
MP2359
1N5819HW-7
LED1
LED2
LED3
-V
-V
OUT
OUT
4
3
EN
FB
OFF ON
GND
2
-V
OUT
-V
OUT
Figure 4—White LED Driver Application
MP2359 Rev. 1.1
6/23/2006
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