Datasheet
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Setup
2.2 Jumper Description
JP1: EN
This jumper enables or disables the LDO outputs. When the jumper is connected between EN and ON,
the power-on sequence is triggered. When it is connected between EN and OFF, the power-down
sequence is triggered.
JP2: VSET
This jumper sets the LDO-1 output voltage setting. When the jumper is installed, LDO-1 is set to 1.9 V.
When the jumper is not installed, LDO-1 is set to 1.8 V.
JP3: SEQ
This jumper connects the sequence select pin to either logic high or low. When no jumper is installed,
the start-up sequence powers up LDO-1 first and LDO-2 second. The shutdown sequence powers
down LDO-2 first and then LDO-1. When the jumper is installed, the start-up sequence powers up
LDO-2 first and then LDO-1; the shutdown sequence powers down LDO-1 first, followed by LDO-2.
2.3 Test Points
TP1: VDET
This test point is connected to the output of the voltage detector that is monitoring the voltage at the
EXT SVS input. When the voltage at EXT SVS drops below approximately 2.35 V, VDET will be logic
low. When the voltage at EXT SVS is above approximately 2.4 V, VDET will be logic high. This
operates independently of the two LDOs and is not enabled or disabled by EN.
TP2: PG
This test point monitors the voltage at the Power-Good output. When VOUT1 and VOUT2 are both
above the respective supervisory threshold voltage for each LDO (V
SVS1
= 1.88 or 1.78 and V
SVS2
=
3.26), PG outputs logic high. If either VOUT1 or VOUT2 falls below its supervisory threshold, then PG
outputs logic low.
TP3: ERR
This test point is connected to the error output. If any error occurs, then ERR drops to logic low. In the
absence of errors, ERR stays at logic high. There are three types of errors that trigger ERR: thermal
shutdown, undervoltage lockout, and current limit.
Thermal Shutdown
Thermal shutdown occurs when the internal junction temperature rises above +160°C. In this case,
ERR only returns to logic high when the temperature drops below +140°C.
Undervoltage Lockout (UVLO)
Undervoltage lockout occurs when VIN drops below 3.6 V. While VIN stays below 3.6 V, ERR is at
logic low. Once VIN rises above 3.6 V, ERR rises to logic high.
Current Limit
If either LDO output current limits, then an error occurs. The current limit for LDO-1 is between
750 mA to 1150 mA, while the current limit for LDO-2 is between 700 mA and 1000 mA.
NOTE: The name of pin 11 has changed from ERR to TEST on the datasheet.
TP4: VSET
This test point monitors the VSET logic input to the integrated circuit (IC). VSET determines the output
voltage of LDO-1. Logic high sets VOUT1 to 1.9 V, and logic low sets VOUT1 to 1.8 V. Installing JP2
increases VSET from logic low to logic high.
TP5: SEQ
This test point is connected to the SEQ input. It is either logic high or low, depending on whether
jumper JP3 is installed or not.
3
SBVU019A–October 2011–Revised October 2011 TPS75005EVM-023
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