MP2112 Просмотр технического описания (PDF) - Monolithic Power Systems
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MP2112 Datasheet PDF : 8 Pages
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TM
MP2112 – 1MHz, 1A SYNCHRONOUS STEP-DOWN CONVERTER
Manufacturer
Coilcraft
Toko
Sumida
Table 2—Suggested Surface Mount Inductors
Part Number
D63CB
D53LC
CDC5D23B
Inductance (µH)
4.7
4.7
4.7
Max DCR (Ω)
0.026
0.026
0.062
Saturation
Current (A)
2.0
2.0
1.6
Dimensions
LxWxH (mm3)
6.3X6.3X3.5
6.3X6.3X3.5
6.0X6.0X2.5
Table 3—Inductors for Improved Efficiency at 25mA, 50mA, under 100mA Load.
Manufacturer
Coilcraft
Murata
Sumida
Sumida
Part Number
DO1605T-103MX
LQH4C100K04
CR32-100
CR54-100
Inductance (µH)
10
10
10
10
Max DCR (Ω)
0.3
0.2
0.2
0.1
Saturation
Current (A)
1.0
1.2
1.0
1.2
IRMS (A)
0.9
0.8
0.7
1.4
Input Capacitor Selection
The input capacitor (C1) reduces the surge
current drawn from the input and switching
noise from the device. The input capacitor
impedance at the switching frequency must be
less than input source impedance to prevent
high frequency switching current passing to the
input. Ceramic capacitors with X5R or X7R
dielectrics are highly recommended because of
their low ESR and small temperature
coefficients. For most applications, a 4.7µF
capacitor is sufficient.
Output Capacitor Selection
The output capacitor (C2) keeps output voltage
ripple small and ensures regulation loop stable.
The output capacitor impedance should remain
low at the switching frequency. Ceramic
capacitors with X5R or X7R dielectrics are
recommended. The output ripple ∆VOUT is
approximately:
( ) ∆VOUT
≤
VOUT × VIN − VOUT
VIN × fOSC × L
×
⎜⎜⎝⎛ESR
+
8
×
1
fOSC
×
C2
⎟⎟⎠⎞
MP2112 Rev. 1.2
www.MonolithicPower.com
7
3/6/2006
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