HOST

NTC

PACK+

PACK-

bq5105xB

BAT

TERM

AD

AD-EN

CHG

EN2

AC1

AC2

COMM2

CLAMP2

RX

COIL

BOOT1

RECT

TS/CTRL

BOOT2

CLAMP1

COMM1

Bi-State

Tri-State

PGND

ILIM

FOD

TI

Wireless

Power

Transmitter

TX

COIL

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

bq51050B, bq51051B, bq51052B

SLUSB42E – JULY 2012 – REVISED MARCH 2015

bq5105xB High-Efficiency Qi v1.1-Compliant Wireless Power Receiver

and Battery Charger

1

1 Features

1

•

Single-Stage Wireless Power Receiver

and Li-Ion/Li-Pol Battery Charger

–

Combines Wireless Power Receiver, Rectifier,

and Battery Charger in a Single, Small

Package

–

4.20-V, 4.35-V, and 4.40-V Output Voltage

Options

–

Supports a Charging Current up to 1.5 A

–

93% Peak AC-DC Charging Efficiency

•

Robust Architecture

–

20-V Maximum Input Voltage Tolerance,

With Input Overvoltage Protection

–

Thermal Shutdown and Overcurrent Protection

–

Temperature Monitoring and Fault Detection

•

Compatible With WPC v1.1 Qi Industry Standard

•

Power Stage Output Tracks Rectifier and Battery

Voltage to Ensure Maximum Efficiency Across the

Full Charge Cycle

•

Available in Small DSGBA and VQFN Packages

2 Applications

•

Battery Packs

•

Cell Phones and Smart Phones

•

Headsets

•

Portable Media Players

•

Other Handheld Devices

3 Description

The bq5105x device is a high-efficiency, Qi-compliant

wireless power receiver with an integrated Li-Ion/Li-

Pol battery charge controller for portable applications.

The bq5105xB devices provide efficient AC-DC

power conversion, integrates the digital controller

required to comply with Qi v1.1 communication

protocol,

and

provides

all

necessary

control

algorithms needed for efficient and safe Li-Ion and Li-

Pol battery charging. Together with the bq500212A

transmitter-side controller, the bq5105x enables a

complete wireless power transfer system for direct

battery

charger

solutions.

By

using

near-field

inductive power transfer, the receiver coil embedded

in the portable device can pick up the power

transmitted by transmitter coil. The AC signal from

the receiver coil is then rectified and conditioned to

apply power directly to the battery. Global feedback

is established from the receiver to the transmitter to

stabilize the power transfer process. This feedback is

established by using the Qi v1.1 communication

protocol.

The bq5105xB devices integrate a low-impedance

synchronous rectifier, low-dropout regulator (LDO),

digital

control,

charger

controller,

and

accurate

voltage and current loops in a single package. The

entire power stage (rectifier and LDO) use low-

resistance N-MOSFETs (100-m

Ω typical Rdson) to

ensure high efficiency and low power dissipation.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

bq51050B

bq51051B

bq51052B

VQFN (20)

4.50 mm × 3.50 mm

DSBGA (28)

3.00 mm × 1.90 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Schematic