ADP1610 データシートの表示（PDF） - Analog Devices

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ADP1610

1.2 MHz DC-to-DC Step-Up Switching Converter

Analog Devices 

ADP1610

Table 4. Recommended Capacitor and Inductor Manufacturers

Vendor Part

Maximum

L (μH) C (μF)/Rating (V) DC Current

Sumida CMD4D11-2R2MC

2.2

0.95

CMD4D11-4R7MC

4.7

0.75

CDRH4D28-100

10

1.00

CDRH5D18-220

22

0.80

CR43-4R7

4.7

1.15

CR43-100

10

1.04

Coilcraft DS1608-472

4.7

1.40

DS1608-103

10

1.00

Toko

D52LC-4R7M

4.7

1.14

D52LC-100M

10

0.76

Murata GRM32ER61A226KE20L

22/10

Maximum

DCR (mΩ)

116

216

128

290

109

182

60

75

87

150

GRM31CR61E106KA12L

10/25

GRM31CR61A106KA01L

10/10

GRM31CR71E475KA88L

4.7/25

Height (mm)

1.2

1.2

3.0

2.0

3.5

3.5

2.9

2.9

2.0

2.0

Comments

Used only for 3.3 V

input and 5 V output

Used for 9 V, 10 V,

and 12 V outputs

Used for inputs and

outputs of 5 V

Using the duty cycle and switching frequency (FSW), the on-time

is calculated using the following equation:

D

tON =

(4)

f SW

The inductor ripple current (ΔIL) in steady state is calculated

using the following equation:

ΔIL = VIN × tON

(5)

L

The inductance value (L) is calculated using the following

equation:

L = VIN ×tON

(6)

ΔI L

The peak inductor current (the maximum input current plus

half the inductor ripple current) must be less than the rated

saturation current of the inductor. Likewise, the maximum

rated rms current of the inductor must be greater than the

maximum dc input current to the regulator.

For duty cycles greater than 50%, which occur with input

voltages greater than one-half the output voltage, slope compensa-

tion is required to maintain stability of the current-mode regulator.

For stable current-mode operation, ensure that the selected

inductance is equal to or greater than LMIN using the following

equation:

L > LMIN

=

VOUT − VIN

1.8A × fSW

(7)

CHOOSING THE INPUT AND OUTPUT CAPACITORS

The ADP1610 requires input and output bypass capacitors to

supply transient currents while maintaining constant input and

output voltage. To prevent noise at the ADP1610 input, a low

ESR (equivalent series resistance), 10 μF or greater input capacitor

is to be used. Place the capacitor between IN and GND as close to

the ADP1610 as possible. Ceramic capacitors are preferred because

of their low ESR characteristics. Alternatively, use a high value,

medium ESR capacitor in parallel with a 0.1 μF low ESR capacitor

as close to the ADP1610 as possible.

The output capacitor maintains the output voltage and supplies

current to the load while the ADP1610 switch is on. The value

and characteristics of the output capacitor greatly affect the

output voltage ripple and stability of the regulator. Use a low

ESR output capacitor; ceramic dielectric capacitors are preferred.

The input bypass capacitor limits the high frequency impedance

of the input voltage source. The value of this capacitor may

need to be increased if the wire length from the input voltage

source to the applications board is longer than 18” to optimize

the transient performance.

Rev. A | Page 11 of 20

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