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MCP1601T-IMS

500 mA Synchronous BUCK Regulator

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MCP1601

DC resistance is another common inductor specifica-

tion. The MCP1601 will work properly with inductor DC

resistance down to 0. The trade-off in selecting an

inductor with low DC resistance is size and cost. To

lower the resistance, larger wire is used to wind the

inductor. The switch resistance in the MCP1601 is

approximately 0.5. Inductors with DC resistance

lower than 0.1 will not have a significant impact on the

efficiency of the converter.

5.3 L and COUT Combinations

When selecting the L-COUT output filter components,

the inductor value range is limited from 10 µH to 22 µH.

However, when using the larger inductor values, larger

capacitor values should be used. The following table

lists the recommended combinations of L and COUT.

TABLE 5-1: L-COUT COMBINATIONS

L

COUT

10 µH

10 µF to 47 µF

15 µH

15 µF to 47 µF

22 µH

22µF to 47 µF

Note:

For proper PFM mode operation, the value

of the external inductor and the external

capacitor should be the same. For exam-

ple, when using a 10 µH inductor, a 10 µF

capacitor should be used. When using a

22 µH inductor, a 22 µF capacitor should

be used.

5.4 Passive Component Suppliers

TABLE 5-2: CERAMIC CAPACITOR

SUPPLIERS

Supplier

Type

Description

Murata®

Murata®

Ceramic 10 µF 0805 X5R 6.3V

#GRM21BR60J106K

Ceramic 10 µF 1206 X5R 6.3V

#GRM319R60J106K

Taiyo

Yuden™

Ceramic 10 µF 1210 X5R 6.3V

JMK325BJ106MD

AVX™

Ceramic 10 µF 0805 X5R 6.3V

#08056D106MAT4A

AVX™

Kemet®

Murata®

Ceramic 10 µF 1206 X5R 6.3V

#12066D106MAT4A

Ceramic 10 µf 1210 6.3V

#C1210C106M9PAC

Ceramic 22 µF 1206 X5R 6.3V

GRM31CR60J226ME20B

Taiyo

Yuden™

Ceramic 22 µF 1210 X5R 6.3V

JMK325BJ226MY

Note: Taiyo Yuden 1210 is a low profile case

(1.15 mm)

TABLE 5-3: ELECTROLYTIC CAPACITOR

SUPPLIERS

Supplier Type

Description

Kemet® Tantalum 47 µF D Case 200 M10V

#T495D476M010AS

AVX™

Sprague®

Sprague®

Sprague®

Tantalum 47 µF C Case 300 M 6.3V

#TPSC476M006S300

Tantalum 47 µF C Case 110 M 16V

594D47X0016C2T

Tantalum 22 µF B Case 380 M 6.3V

594D226X06R3B2T

Tantalum 15 µF B Case 500 M 10V

594D156X0010B2T

DS21762B-page 14

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