Datasheet
40
50
60
70
80
90
100
0
1
2 3
4
5
Efficiency (%)
Power (W)
0
10
20
30
40
50
60
70
80
0 1 2 3 4 5
Efficiency (%)
Power (mW)
bq51013B
SLUSB62A –MARCH 2013–REVISED OCTOBER 2013
www.ti.com
PIN FUNCTIONS (continued)
NAME YFP RHL I/O DESCRIPTION
Programming pin for the over current limit. Connect external resistor to VSS. Size R
ILIM
with the
following equation: R
ILIM
= 250 / I
MAX
where IMAX is the expected maximum output current of the
wireless power supply. The hardware current limit (IILIM) will be 20% greater than IMAX or 1.2 x
ILIM G1 12 I/O
1
MAX
. If the supply is meant to operate in current limit use
R
ILIM
= 300 / I
ILIM
R
ILIM
= R1 + 188
Connect this pin to the wired adapter input. When a voltage is applied to this pin wireless charging
AD G4 9 I is disabled and AD_EN is driven low. Connect to GND through a 1 µF capacitor. If unused,
capacitor is not required and should be grounded directly.
Push-pull driver for external PFET connecting AD and OUT. This node is pulled to the higher of
OUT and AD when turning off the external FET. This voltage tracks approximately 4 V below AD
AD-EN F3 8 O
when voltage is present at AD and provides a regulated VSG bias for the external FET. Float this
pin if unused.
Must be connected to ground via a resistor. If an NTC function is not desired connect to GND with
a 10 kΩ resistor. As a CTRL pin pull to ground to send end power transfer (EPT) fault to the
TS-CTRL F1 13 I transmitter or pull-up to an internal rail (i.e. 1.8 V) to send EPT termination to the transmitter. Note
that a 3-state driver should be used to interface this pin (see the 3-state Driver section for further
description)
EN1 G3 10 I Inputs that allow user to enable/disable wireless and wired charging <EN1 EN2>:
<00> wireless charging is enabled unless AD voltage > 3.6 V
<01> Dynamic communication current limit disabled
EN2 G2 11 I
<10> AD-EN pulled low, wireless charging disabled
<11> wired and wireless charging disabled.
Input for the recieved power measurement. Connect to GND with a 188 Ω resistor. Please refer
FOD F2 14 I
FOD section for more detail.
Open-drain output – active when output current is being delivered to the load (i.e. when the output
CHG F4 7 O
of the supply is enabled).
Spacer
TYPICAL CHARACTERISTICS
Figure 5. Rectifier Efficiency Figure 6. System Efficiency from DC Input to DC Output
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