RB070M-30TR Просмотр технического описания (PDF) - Seiko Instruments Inc

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RB070M-30TR

STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM / PFM SWITCHABLE SWITCHING REGULATOR

Seiko Instruments Inc 

STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR

S-8363 Series

Rev.2.0_01

 External Parts Selection

1. Inductor

The recommended L value of the S-8363 Series is 2.2 μH.

Caution

When selecting an inductor, be careful about its allowable current. If a current exceeding the

allowable current flows through the inductor, magnetic saturation occurs, substantially lowering

the efficiency and destroying ICs due to large current. Therefore, select an inductor such that IPK

does not exceed the allowable current. The following equations express IPK in the ideal statuses

in the discontinuous and continuous modes :

IPK =

IPK =

2 × IOUT × (VOUT + VD*2 − VIN)

fOSC*1 × L

VOUT + VD*2

VIN

× IOUT +

(VOUT + VD*2 − VIN) × VIN

2 × (VOUT + VD*2) × fOSC*1 × L

(Discontinuous mode)

(Continuous mode)

*1. fOSC : oscillation frequency

*2. VD is the forward voltage of a diode. The reference value is 0.4 V.

However, current exceeding the above equation flows because conditions are practically not ideal.

Perform sufficient evaluation with actual application.

Manufacturer

TDK Corporation

Coilcraft, Inc

Murata Manufacturing

Co., Ltd.

TAIYO YUDEN Co., Ltd.

Table 9 Typical Inductors

Name

VLF302510-2R2M

VLS3010T-2R2M

VLS201610E

MLP2012S2R2M

LPS3010-222ML

LQM2HPN2R2MG0

LQH3NPN2R2NG0

NR3010T2R2M

NR4010T2R2N

BRL2518T2R2M

L value

2.2 μH

2.2 μH

2.2 μH

2.2 μH

2.2 μH

2.2 μH

2.2 μH

2.2 μH

2.2 μH

2.2 μH

Direct resistor Rated current

0.084 Ω max. 1.23 A max.

0.116 Ω max. 1.2 A max.

0.276 Ω max. 0.94 A max.

0.300 Ω max. 0.8 A max.

0.220 Ω max. 1.3 A max.

0.080 Ω±25% 1.3 A max.

0.140 Ω±20% 1.25 A max.

0.114 Ω max. 1.1 A max.

0.180 Ω max. 1.15 A max.

0.1755 Ω max. 0.85 A max.

Size (L × W × H）[mm]

3.0 × 2.5 × 1.0

3.0 × 3.0 × 1.0

2.0 × 1.6 × 0.95

2.0 × 1.25 × 1.0

3.0 × 3.0 × 1.0

2.5 × 2.0 × 1.0

2.7 × 3.0 × 1.0

3.0 × 3.0 ×1.0

4.0 × 4.0 ×1.0

2.5 × 1.8 × 1.2

18

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