mp2359dt MPS, mp2359dt Datasheet - Page 7

• Manufacturer Part Number: mp2359dt
• Description: 1.2a, 24v, 1.4mhz Step-down Converter In A Tsot23-6
• Manufacturer: MPS

MP2359 Rev. 1.2
5/26/2008
Wurth Electronics
Manufacturer
PGND
R2
Sumida
Toko
C1
R1
Figure 2—PCB Layout
D1
CDRH4D28C/LD
A921CY-4R7M
Part Number
7440530047
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
Table 2—Suggested Surface Mount Inductors
MP2359 – 1.2A, 24V, 1.4MHz STEP-DOWN CONVERTER IN A TSOT23-6
SGND
L1
C2
Inductance(µH)
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4.7
4.7
4.7
Max DCR(Ω)
External Bootstrap Diode
An external bootstrap diode may enhance the
efficiency of the regulator, the applicable
conditions of external BST diode are:
In these cases, an external BST diode is
recommended from the output of the voltage
regulator to BST pin, as shown in Fig.3
The recommended external BST diode is
IN4148, and the BST cap is 0.1~1µF.
Figure 3—Add Optional External Bootstrap
0.027
0.036
0.038
V
Duty cycle is high: D=
OUT
MP2359
=5V or 3.3V; and
Diode to Enhance Efficiency
BST
SW
Rating (A)
Current
1.66
1.5
2.0
C
External BST Diode
BST
L
V
IN4148
V
OUT
C
IN
OUT
L x W x H (mm
>65%
5.8 x 5.8 x 2.8
Dimensions
5.1 x 5.1 x 3
6 x 6.3 x 3
5V or 3.3V
3
)
7