TLS205B0EJV50
TLS205B0LDV50
Pin Configuration
Data Sheet 5 Rev. 1.1, 2015-01-15
3.2 Pin Definitions and Functions
Pin Symbol Function
1 (DSO-8 EP)
1,2 (TSON-10)
Q Output. Supplies power to the load. For this pin a minimum output capacitor of
3.3 µF is required to prevent oscillations. Larger output capacitors may be
required for applications with large transient loads in order to limit peak voltage
transients or when the regulator is applied in conjunction with a bypass capacitor.
For more details please refer to “Application Information” on Page 19.
2 (DSO-8 EP)
4 (TSON-10)
SENSE Output Sense. The SENSE pin is the input to the error amplifier. This allows to
achieve an optimized regulation performance in case of small voltage drops
R
p
that occur between regulator and load. In applications where such drops are
relevant they can be eliminated by connecting the SENSE pin directly at the load.
In standard configuration the SENSE pin can be directly connected to Q. For
further details please refer to the section “Kelvin Sense Connection” on
Page 19.
3, 7 (DSO-8 EP)
3, 8 (TSON-10)
NC No Connect. The NC Pins have no connection to any internal circuitry. Connect
either to GND or leave open.
4 (DSO-8 EP)
5 (TSON-10)
BYP Bypass. The BYP pin is used to bypass the reference of the TLS205B0 V50 to
achieve low noise performance. The BYP-pin is clamped internally to ±0.6 V (i.e.
one
V
BE
). A small capacitor from the output Q to the BYP pin will bypass the
reference to lower the output voltage noise
1)
. If not used this pin must be left
unconnected.
1) A maximum value of 10 nF can be used for reducing output voltage noise over the bandwidth from 10 Hz to 100 kHz.
5 (DSO-8 EP)
7 (TSON-10)
EN Enable. With the EN pin the TLS205B0 V50 can be put into a low power shutdown
state. The output will be off when the EN is pulled low. The EN pin can be driven
either by 3.3 V or 5 V logic or as well by open-collector logic with pull-up resistor.
The pull-up resistor is required to supply the pull-up current of the open-collector
gate
2)
and the EN pin current
3)
. Please note that if the EN pin is not used it must
be connected to
V
I
. It must not be left floating.
2) Normally several microamperes.
3) Typical value is 1 µA.
6 (DSO-8 EP)
6,(TSON-10)
GND Ground.
8 (DSO-8 EP)
9, 10 (TSON-10)
I Input. The device is supplied by the input pin I. A capacitor at the input pin is
required if the device is more than 6 inches away from the main input filter
capacitor or if a non-negligible inductance is present at the input I
4)
. The
TLS205B0 V50 is designed to withstand reverse voltages on the input pin I with
respect to GND and output Q. In the case of reverse input (e.g. due to a wrongly
attached battery) the device will act as if there is a diode in series with its input. In
this way there will be no reverse current flowing into the regulator and no reverse
voltage will appear at the load. Hence, the device will protect both - the device
itself and the load.
4) In general the output impedance of a battery rises with frequency, so it is advisable to include a bypass capacitor in battery-
powered circuits. Depending on actual conditions an input capacitor in the range of 1 to 10 µF is sufficient.
9 (DSO-8 EP)
11 (TSON-10)
Tab Exposed Pad. To ensure proper thermal performance, solder Pin 11 of TSON-10
to the PCB ground and tie directly to Pin 6. In the case of DSO-8 EP as well solder
Pin 9 (exposed pad) to the PCB ground and tie directly to Pin 6 (GND).
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