BQ25046 Datasheet, PDF (1/19 Pages) Texas Instruments – 1.1A, Single-Input 5-V Power Supply IC for Wireless Power Applications

bq25046
www.ti.com
SLUSA83 – SEPTEMBER 2010
1.1A, Single-Input 5-V Power Supply IC for Wireless Power Applications
Check for Samples: bq25046
FEATURES
1
• 30V Input Rating, with 15V Over-Voltage
Protection (OVP) Threshold
• Integrated Charge Current Sense for Wireless
Power Transfer Efficiency Monitoring
• 3.3V, 15mA integrated Low Dropout Linear
Regulator (VDD3.3) Supplies Power to
MSP430BQ1010 Directly
• 2% Output Voltage Regulation
• Pin Selectable 100mA and 400mA Current
Limit Enables Robust Communication in
Wireless Power Systems at any Output
Current Level
• Soft-Start Feature to Reduce Inrush Current
• Status Indication – Power Good (PG) and
Output Enabled (CHG)
• Available in Small 2mm × 3mm DFN-10
Package
APPLICATIONS
• Wireless Power Applications
• Smart Phones
• PDAs
• MP3 Players
• Low-Power Handheld Devices
DESCRIPTION
The bq25046 is a highly integrated linear power
supply IC targeted at both wired and wireless power
applications. With an accurate 5-V regulated output
and integrated 3.3-V LDO, the bq25046 is an ideal
solution for wireless power supply solutions up to 5
W.
The bq25046 integrates several functions which
enable a wireless charging solution within a small
area and low component count. These include a
3.3-V LDO which drives an MSP430BQ1010 wireless
controller, high-accuracy current sense for calculating
receiver-side power usage, 100mA/400mA current
limits enable robust communication at all load current
levels, and integrated pass FET acts as load
disconnect switch and 5-V regulator to protect
downstream circuitry. In addition, the bq25046 has an
absolute maximum input voltage of 30 V and an OVP
threshold of 15 V, which enables safe and robust
operation in inductive power transfer systems that
use either resistive or capacitive load modulation.
APPLICATION SCHEMATIC
RX Resonant
Coil Caps
Discrete Rectifier
20 mF
IN
ISET
VDD3.3
OUT
EN1
EN2
BQ25046
5-V
Output
Communication
Modulator
EN1
ISET_SCALE
EN2
VIN_DIV
DISABLE_
HI
COMM_ILIM
LO
COMM
MSP430BQ1010
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010, Texas Instruments Incorporated