Datasheet

TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
Table 8-1. Main Charge Electrical Characteristics
VBAT = 3.6 V, R
S
= 0.22 Ω, unless otherwise specified (continued)
Parameter Test Conditions Min Typ Max Unit
Battery Rs ESR (including FUSE) 0.5 Ω
8.3.2 Precharge
During slow precharge and fast precharge, a precharge voltage loop is always enabled and limits the
battery voltage charge to 3.6 V typical. To use the constant voltage loop, a battery voltage prescaler is
also always enabled. The voltage loop is nonlinear. A fast comparator switches off the external power
portable media operating system (PMOS) when VBAT is higher than 3.6 V and switches on the PMOS
when VBAT is lower than 3.6 V. When the USB charger is used, fast precharge is not available (to comply
with USB standards).
In precharge mode, the threshold of the ac charger overvoltage detection is forced to 6.8 V.
Table 8-2 lists the precharge electrical characteristics.
Table 8-2. Precharge Electrical Characteristics
R
S
= 0.22 Ω, unless otherwise specified
Parameter Test Conditions Min Typ Max Unit
ICTLAC1 output voltage swing I
ICTLAC1
= –10 μA, VBAT = 1.5 V, VCCS = VBAT+200 mV, VAC–0.3 V
(precharge) VAC = 5.4 V, SYSACTIV = 0
I
ICTLAC1
= 10 μA, VBAT = 1.5 V, VCCS = VBAT, 0.35
VAC = 5.4 V, SYSACTIV = 0
ICTLUSB1 output voltage I
ICTLUSB1
= –10 μA, VBAT = 1.5 V, VCCS = VBAT+200 mV, VAC–0.3 V
swing (precharge) VAC = 0.0 V, VBUS = 5 V, SYSACTIV = 0
I
ICTLUSB1
= 10 μA, VBAT = 1.5 V, VCCS = VBAT, 0.35
VAC = 0.0 V, VBUS = 5 V, SYSACTIV = 0
ICTLAC2 output voltage swing I
ICTLAC2
= –10 μA, VBAT = 1.5 V, VCCS = VBAT+200 mV, VCCS–0.3 V
(precharge) VAC = 5.4 V, SYSACTIV = 0
I
ICTLAC2
= 10 μA, VBAT = 1.5 V, VCCS = VBAT, 0.35
VAC = 5.4 V, SYSACTIV = 0
ICTLUSB2 output voltage I
ICTLUSB2
= –10 μA, VBAT = 1.5 V, VCCS = VBAT+200 mV, VCCS–0.3 V
swing (precharge) VAC = 0.0 V, VBUS = 5 V, SYSACTIV = 0
I
ICTLUSB2
= 10 μA, VBAT = 1.5 V, VCCS = VBAT, 0.35
VAC = 0.0 V, VBUS = 5 V, SYSACTIV = 0
ac precharge battery removal In fast precharge, Rlimit = 700 kΩ, VAC = 5.4 V, 150 μs
switch-off time VBAT threshold = 3.6 V, measure charge current from
removal to 10%
USB precharge battery removal In precharge, Rlimit = 500 kΩ, VBUS = 5.0 V, 150 μs
switch-off time VBAT threshold = 3.6 V, measure charge current from
removal to 10%
PCHGPOR voltage threshold VAC = 5.4 V or VBUS = 5.0 V, PCHGPOR raise when 1.2 V
VPRECH voltage higher than the voltage threshold
PCHGCLK click frequency VAC = 5.4 V or VBUS = 5.0 V (including temperature 18.5 32 45.4 kHz
variation)
VAC = 5.4 V or VBUS = 5.0 V (at room temperature) 24.3 32 39.68
PCHGVREF band gap voltage VAC = 5.4 V or VBUS = 5.0 V 0.7125 0.75 0.7875 V
VPRECH regulator output VAC = 5.4 V or VBUS = 5.0 V 1.4 1.5 1.6 V
Small precharge output current VBAT = 0.0 V, VAC = 5.4 V or (VBUS = 5.0 V and 3 5 7 mA
USBSLOWPCHG = 1)
Slow precharge loop accuracy After TRIMinG, VAC = 5.4 V or VBUS = 5.0 V, 14 17.2 20.3 mV
VBAT = 1.5 V, VCCS–VBATS rising voltage, monitoring
ICTLAC1 or ICTLUSB1
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