The bq51222 device is a fully contained wireless power receiver capable of operating in both the Wireless Power Consortium (WPC) Qi and Power Matters Alliance (PMA) protocols which allows a wireless power system to work with both inductive charging standards. The bq51222 device provides a single device power conversion (rectification and regulation) as well as the digital control and communication for both standards. It also has autonomous detection of protocol and requires no additional active devices. The bq51222 device complies with the WPC v1.2 and PMA communication protocol. Together with the WPC or a PMA primary-side controller, the bq51222 device enables a complete wireless power transfer system for a wireless power supply solution. 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 (MAX) |
---|---|---|
bq51222 | DSBGA (42) | 3.586 mm × 2.874 mm |
SPACER
Changes from * Revision (July 2016) to A Revision
DEVICE | MODE | MORE |
---|---|---|
bq51221 | Dual (WPC v1.1, PMA) | Adjustable output voltage, highest system efficiency, I2C |
bq51222 | Dual (WPC v1.2, PMA) | Adjustable output voltage, highest system efficiency, I2C |
bq51021 | WPC v1.1 | Adjustable output voltage, highest system efficiency, I2C |
bq51020 | WPC v1.1 | Adjustable output voltage, highest system efficiency, standalone |
PIN | TYPE | DESCRIPTION | |
---|---|---|---|
NAME | NUMBER | ||
AC1 | B1, B2, B3 | I | AC input power from receiver resonant tank |
AC2 | B4, B5, B6 | I | |
AD | E2 | I | Adapter sense pin |
AD-EN | E3 | O | Push-pull driver for PFET 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 | |
COMM1 | F1 | O | Open-drain FETs used to communicate with primary by varying reflected impedance |
COMM2 | F6 | O | |
CLAMP1 | E1 | O | Open-drain FETs used to clamp the secondary voltage by providing low impedance across secondary |
CLAMP2 | E6 | O | |
CM_ILIM | G3 | I | Enables or disables communication current limit; can be pulled high or low to disable or enable communication current limit |
FOD | F2 | I | Input that is used for scaling the received power message |
ILIM | G2 | I/O | Output current or overcurrent level programming pin |
LPRB 1 | F5 | O | Open drain – active to help drive RECT voltage high at light load on a PMA TX |
LPRB 2 | G6 | ||
OUT | D1, D2, D3, D4, D5, D6 | O | Output pin, used to deliver power to the load |
PD_DET | G6 | O | Open drain output that allows user to sense when receiver is on transmitter |
PGND | A1, A2, A3, A4, A5, A6 | — | Power and logic ground |
RECT | C2, C3, C4, C5 | O | Filter capacitor for the internal synchronous rectifier |
SCL | E4 | I | SCL and SDA are used for I2C communication |
SDA | F4 | I | |
TERM, LPRBEN | F3 | I | Sets termination current as a percentage of IILIM as TERM pin. When TERM resistor is populated, LPRB pins are enabled with appropriate function |
TMEM | G5 | O | TMEM allows 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) or end of charge (EOC) to TX |
VIREG | E5 | I | Rectifier voltage feedback |
VO_REG | G1 | I | Sets the regulation voltage for output |
WPG | F5 | O | Open-drain output that allows user to sense when power is transferred to load |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Input voltage | AC1, AC2 | –0.8 | 20 | V |
RECT, COMM1, COMM2, OUT, LPRB1, LPRB2, CLAMP1, CLAMP2, WPG, PD_DET | –0.3 | 20 | ||
AD, AD-EN | –0.3 | 30 | ||
BOOT1, BOOT2 | –0.3 | 20 | ||
SCL, SDA, TERM, CM_ILIM, FOD, TS/CTRL, ILIM, TMEM, VIREG, VO_REG, LPRBEN | –0.3 | 7 | ||
Input current | AC1, AC2 (RMS) | 2.5 | A | |
Output current | OUT | 1.5 | A | |
Output sink current | LPRB1, LPRB2 | 15 | mA | |
Output sink current | COMM1, COMM2 | 1 | A | |
Junction temperature, TJ | –40 | 150 | °C | |
Storage temperature, Tstg | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD)(1) | Electrostatic discharge | Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(2), 100 pF, 1.5 kΩ | ±2000 | V |
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(3) | ±500 |
MIN | MAX | UNIT | ||
---|---|---|---|---|
VRECT | RECT voltage range | 4 | 10 | V |
IOUT | Output current | 1 | A | |
IAD-EN | Sink current | 1 | mA | |
ICOMM | COMMx sink current | 500 | mA | |
TJ | Junction temperature | 0 | 125 | ºC |
THERMAL METRIC(1) | bq51222 | UNIT | |
---|---|---|---|
YFP (DSBGA) | |||
42 PINS | |||
RθJA | Junction-to-ambient thermal resistance(2) | 49.7 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance(3) | 0.2 | °C/W |
RθJB | Junction-to-board thermal resistance(4) | 6.1 | °C/W |
ψJT | Junction-to-top characterization parameter(5) | 1.4 | °C/W |
ψJB | Junction-to-board characterization parameter(6) | 6 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance(7) | N/A | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
VUVLO | Undervoltage lockout | VRECT: 0 to 3 V | 2.8 | 2.9 | V | |
VHYS-UVLO | Hysteresis on UVLO | VRECT: 3 to 2 V | 393 | mV | ||
VRECT-OVP | Input overvoltage threshold | VRECT: 5 to 16 V | 14.6 | 15.1 | 15.6 | V |
VHYS-OVP | Hysteresis on OVP | VRECT: 16 to 5 V | 1.5 | V | ||
VRECT(REG) | Voltage at RECT pin set by communication with primary | VOUT + 0.12 | VOUT + 2 | V | ||
VRECT(TRACK) | VRECT regulation above VOUT | VILIM = 1.2 V | 140 | mV | ||
ILOAD-HYS | ILOAD hysteresis for dynamic VRECT thresholds as a % of IILIM | ILOAD falling | 4% | |||
VRECT-DPM | Rectifier under voltage protection, restricts IOUT at VRECT-DPM | 3 | 3.1 | 3.2 | V | |
VRECT-REV | Rectifier reverse voltage protection with a supply at the output | VRECT-REV = VOUT – VRECT, VOUT = 10 V | 8.8 | 9.2 | V | |
ILPRB1-dis | Current at which LPRB1 is disabled | IOUT 0 to 200 mA | 125 | mA | ||
ILPRB2-dis | Current at which LPRB2 is disabled | IOUT 0 to 400 mA | 322 | mA | ||
QUIESCENT CURRENT | ||||||
IOUT(standby) | Quiescent current at the output when wireless power is disabled | VOUT ≤ 5 V, 0°C ≤ TJ ≤ 85°C | 20 | 35 | µA | |
ILIM SHORT CIRCUIT | ||||||
RILIM-SHORT | Highest value of RILIM resistor considered a fault (short). Monitored for IOUT > 100 mA | RILIM: 200 to 50 Ω. IOUT latches off, cycle power to reset | 215 | 230 | Ω | |
tDGL-Short | Deglitch time transition from ILIM short to IOUT disable | 1 | ms | |||
ILIM_SC | ILIM-SHORT,OK enables the ILIM short comparator when IOUT is greater than this value | ILOAD: 0 to 200 mA | 110 | 125 | 140 | mA |
ILIM-SHORT,OK HYSTERESIS | Hysteresis for ILIM-SHORT,OK comparator | ILOAD: 200 to 0 mA | 20 | mA | ||
IOUT-CL | Maximum output current limit | Maximum ILOAD that can be delivered for 1 ms when ILIM is shorted | 3.7 | A | ||
OUTPUT | ||||||
VO_REG | Feedback voltage set point | ILOAD = 1000 mA | 0.495 | 0.5013 | 0.5075 | V |
ILOAD = 1 mA | 0.4951 | 0.5014 | 0.5076 | |||
KILIM | Current programming factor for hardware short circuit protection | RILIM = KILIM / IILIM, where IILIM is the hardware current limit IOUT = 850 mA |
842 | AΩ | ||
IOUT_RANGE | Current limit programming range | 1500 | mA | |||
ICOMM | Output current limit during communication | IOUT ≥ 400 mA | IOUT – 50 | mA | ||
100 mA ≤ IOUT < 400 mA | IOUT + 50 | |||||
IOUT < 100 mA | None | |||||
tHOLD-OFF | Hold off time for the communication current limit during startup | 1 | s | |||
TS/CTRL | ||||||
VTS-Bias | TS bias voltage (internal) | ITS-Bias < 100 µA and communication is active (periodically driven, see tTS/CTRL-Meas) | 1.8 | V | ||
VCTRL-HI | CTRL pin threshold for a high | VTS/CTRL: 50 to 150 mV | 90 | 105 | 120 | mV |
TTS/CTRL-Meas | Time period of TS/CTRL measurements, when TS is being driven | TS bias voltage is only driven when power packets are sent | 1700 | ms | ||
VTS-HOT | Voltage at TS pin when device shuts down | 0.38 | V | |||
THERMAL PROTECTION | ||||||
TJ(OFF) | Thermal shutdown temperature | 155 | °C | |||
TJ(OFF-HYS) | Thermal shutdown hysteresis | 20 | °C | |||
OUTPUT LOGIC LEVELS ON WPG | ||||||
VOL | Open drain WPG pin | ISINK = 5 mA | 550 | mV | ||
IOFF,STAT | WPG leakage current when disabled | VWPG = 20 V | 1 | µA | ||
COMM PIN | ||||||
RDS-ON(COMM) | COMM1 and COMM2 | VRECT = 2.6 V | 1 | Ω | ||
ƒCOMM | Signaling frequency on COMMx pin for WPC | 2.00 | Kb/s | |||
IOFF,COMM | COMMx pin leakage current | VCOMM1 = 20 V, VCOMM2 = 20 V | 1 | µA | ||
CLAMP PIN | ||||||
RDS-ON(CLAMP) | CLAMP1 and CLAMP2 | 0.5 | Ω | |||
ADAPTER ENABLE | ||||||
VAD-EN | VAD rising threshold voltage | VAD 0 V to 5 V | 3.5 | 3.6 | 3.8 | V |
VAD-EN-HYS | VAD-EN hysteresis | VAD 5 V to 0 V | 450 | mV | ||
IAD | Input leakage current | VRECT = 0 V, VAD = 5 V | 50 | μA | ||
RAD_EN-OUT | Pullup resistance from AD-EN to OUT when adapter mode is disabled and VOUT > VAD | VAD = 0 V, VOUT = 5 V | 230 | 350 | Ω | |
VAD_EN-ON | Voltage difference between VAD and VAD-EN when adapter mode is enabled | VAD = 5 V, 0°C ≤ TJ ≤ 85°C | 4 | 4.5 | 5 | V |
VAD = 9 V, 0°C ≤ TJ ≤ 85°C | 3 | 6 | 7 | V | ||
SYNCHRONOUS RECTIFIER | ||||||
ISYNC-EN | IOUT at which the synchronous rectifier enters half synchronous mode | IOUT: 200 mA to 0 mA | 100 | mA | ||
ISYNC-EN-HYST | Hysteresis for IOUT,RECT-EN (full-synchronous mode enabled) | IOUT 0 mA to 200 mA | 40 | mA | ||
VHS-DIODE | High-side diode drop when the rectifier is in half synchronous mode | IAC-VRECT = 250 mA, and TJ = 25°C |
0.7 | V | ||
I2C | ||||||
VIL | Input low threshold level SDA | V(PULLUP) = 1.8 V, SDA | 0.4 | V | ||
VIH | Input high threshold level SDA | V(PULLUP) = 1.8 V, SDA | 1.4 | V | ||
VIL | Input low threshold level SCL | V(PULLUP) = 1.8 V, SCL | 0.4 | V | ||
VIH | Input high threshold level SCL | V(PULLUP) = 1.8 V, SCL | 1.4 | V | ||
I2C speed | Typical | 100 | kHz |
Register 0x01 (B0, B1, B2) | ||
1-mA Load |
Register 0x01 (B0, B1, B2) | ||
1-A Load |