The bq51025 device is a fully-contained wireless power receiver capable of operating in the Wireless Power Consortium (WPC) Qi protocol, which allows a wireless power system to deliver 5 W to the system with Qi inductive transmitters and up to 10 W when operating with the bq500215 primary-side controller. The bq51025 device provides a single device power conversion (rectification and regulation) as well as the digital control and communication as per WPC v1.2 specification. With market-leading 84% system efficiency and adjustable output voltage, the bq51025 device allows for unparalleled system optimization. With a maximum output voltage of 10 V, the bq51025 offers a flexible solution that offers a wireless power solution for 2S battery application and allows optimal thermal performance of the system. The I2C interface allows system designers to implement new features such as aligning a receiver on the transmitter surface or detecting foreign objects on the receiver. The bq51025 device complies with the WPC v1.2 communication protocol making it compatible with all WPC transmitter solutions. The receiver allows for synchronous rectification, regulation and control, and communication to all exist in a market-leading form factor, efficiency, and solution size.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
bq51025 | DSBGA (42) | 3.60 mm × 2.89 mm |
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Changes from B Revision (March 2015) to C Revision
Changes from A Revision (September 2014) to B Revision
Changes from * Revision (September 2014) to A Revision
DEVICE | MODE | DESCRIPTION |
---|---|---|
bq51221 | Dual (WPC v1.2, PMA) | Autonomous mode detection, I2C control, adjustable output voltage |
bq51020 | WPC v1.2 | Stand-alone solution, adjustable output voltage, highest system efficiency |
bq51025 | WPC v1.2, Proprietary 10 W | I2C control, adjustable output voltage, 10-W maximum output power |
PIN | TYPE | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
AC1 | B1 | I | AC input power from receiver resonant tank |
B2 | |||
B3 | |||
AC2 | B4 | I | |
B5 | |||
B6 | |||
AD | E2 | I | Adapter sense pin |
AD-EN | E3 | O | Push-pull driver for dual PFET circuit that can pass AD input to the OUT pin; used for adapter MUX control |
BOOT1 | C1 | O | Bootstrap capacitors for driving the high-side FETs of the synchronous rectifier |
BOOT2 | C6 | O | |
CLAMP1 | E1 | O | Open-drain FETs used to clamp the secondary voltage by providing low impedance across secondary |
CLAMP2 | E6 | O | |
COMM1 | F1 | O | Open-drain FETs used to communicate with primary by varying reflected impedance |
COMM2 | F6 | O | |
CM_ILIM | G3 | I | Enables communication current limit when pulled low or left floating. |
FOD | F2 | I | Input that is used for scaling the received power message |
ILIM | G2 | I/O | Output current or overcurrent level programming pin |
OUT | D1 | O | Output pin, used to deliver power to the load |
D2 | |||
D3 | |||
D4 | |||
D5 | |||
D6 | |||
PD_DET | G6 | O | Open-drain output that allows user to sense when receiver is on transmitter |
PGND | A1 | — | Power and logic ground |
A2 | |||
A3 | |||
A4 | |||
A5 | |||
A6 | |||
RECT | C2 | O | Filter capacitor for the internal synchronous rectifier |
C3 | |||
C4 | |||
C5 | |||
SCL | E4 | I | SCL and SDA are used for I2C communication. Connect to ground if not needed. |
SDA | F4 | I/O | |
PMODE | F3 | O | Indicates receiver mode of operation: Low = Proprietary 10-W mode, High = Low-power mode. Gate drive output for external current limit switch. Connect 5-MΩ resistor to ground. Leave floating if unused. |
TMEM | G5 | O | TMEM allows the capacitor to be connected to GND so energy from transmitter ping can be stored to retain memory of state. |
TS/CTRL | G4 | I | Temperature sense. Can be pulled high to send end power transfer (EPT) – charge complete to TX. Can be pulled low to send EPT – over temperature |
VO_REG | G1 | I | Sets the regulation voltage for output. Default value is 0.5 V. |
VIREG | E5 | I | Rectifier voltage feedback |
WPG | F5 | O | Open-drain output that allows user to sense when power is transferred to load |