LLCC68 datasheet(33/111 Pages) SEMTECH

33 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

33 of 111

Semtech

LLCC68

www.semtech.com

5.1.3 Consideration on the DC-DC Inductor Selection

The inductor is essential to ensure optimal performance of the DC-DC internal block. An incorrect inductor could cause unwanted effects

ranging from ripple currents to early aging of the device, and a degradation of DC-DC regulator efficiency.

The preferred inductor is shielded, presenting a low internal series resistance and a resonance frequency much higher than the DC-DC

switching frequency. When selecting the 15µH inductor, the user should therefore select a part with the following considerations:

• DCR (max) = 2ohms

• Idc (min) = 100mA

• Freq (min) = 20MHz

5.2 Flexible DIO Supply

The transceiver has two power supply pins, one for the core of the transceiver called VBAT and one for the host controller interface (SPI,

DIOs, BUSY) called VBAT_IO. Both power supplies can be connected together in the application. In case a low voltage micro-controller

(typically with IO pads at 1.8V) is used to control the transceiver, the user can:

• Use VBAT at 3.3V for optimal RF performance

• Directly connect VBAT_IO to the same supply used for the micro-controller

• Connect the digital IOs directly to the micro-controller DIOs

At any time, VBAT_IO must be lower than or equal to VBAT

Figure 5-3: Separate DIO Supply

Table 5-3: Recommended 15µH Inductors

Reference

Manufacturer

Value (µH)

Idc max

(mA)

Freq

(MHz)

DCR

(ohm)

Package

(L x W x H in mm)

LPS3010-153

Coilcraft

370

0.95

2.95 x 2.95 x 0.9

MLZ2012N150L

TDK

0.47

2 x 1.25 x 1.25

MLZ2012M150W

TDK

120

0.95

2 x 1.25 x 1.25

VLS2010ET-150M

TDK

440

1.476

2 x 2 x 1

VLS2012ET-150M

TDK

440

1.062

2 x 2 x 1.2

Battery

Typ. 1.8 to 3.7 V

Controller

Regulator 1.8 V

Transceiver

VBAT_IO

VBAT

SPI

DIOx

NRESET

Requirement: VBAT ≥ VBAT_IO

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