TS51111 datasheet(13/22 Pages) SEMTECH

13 / 22 page

TS51111

Final Datasheet

Rev 2.2

April 17, 2015

www.semtech.com

13 of 22

Semtech

Proprietary & Confidential

Functional Description (continued)

Charge Termination

To allow for accurate charge termination in a charging

application, the TS51111 load switch can be reconfigured

to operate as a voltage regulator. In this mode, the switch

source voltage will be regulated to the voltage set by the

VOUTSET<6:0> bits. The switch is put into this mode by

asserting the EN_TOP bit of the configuration register.

Available voltage settings and the corresponding codes are

shown. To support indirect charge applications, the EN_TOP

and IND_SET bits must both be set hi. The output voltage

will still be determined by the VOUTSET<6:0> bits. The

VOUT setpoints are 3.0V to 5.54V in 20mV steps. In addition,

VOUTSET<6:0>=0x64 will select a 5.0V setpoint.

AMUX

To reduce the number of connections required between the

microprocessor and the TS51111, all analog outputs from

the TS51111 are measured from the same analog pin and

selectable via the AMUX register. Signals on the AMUX pin

are buffered using an internal unity gain amplifier. When

unselected, the AMUX pin will be high impedance.

AMUX<2:0>

Analog Signal

000

----

001

PDC_DIV

010

IOSENSE

011

IBSENSE

100

TEMP

101

PACKP_DIV

110

USB_DIV

111

THERM_DIV

Thermistor Driver

An integrated thermistor driver allows system temperature

measurement. When enabled, the thermistor drive will drive

the VREF voltage onto the THERM pin. When disabled, the

THERM pin will be high impedance to allow external drive of

the same thermistor. In the automatic mode, the thermistor

driver is enabled whenever battery charging is enabled. This

is whenever EN_SW or EN_PRE are active. The voltage on the

THERM pin can be measured using the internal voltage divider

and will be visible on the AMUX pin.

TCTRL<1:0>

Thermistor Operation

Disable

Enable

Auto

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