5 Pin Configuration and Functions

TPS4811-Q1 DGX
Package,19-Pin
VSSOP(Top
View)

Figure 5-1 DGX Package,19-Pin VSSOP(Top View)

Table 5-1 Pin Functions

PIN			TYPE	DESCRIPTION
NAME	TPS48110-Q1	TPS48111-Q1
NAME	DGX-19 (VSSOP)
EN/UVLO	1	1	I	EN/UVLO input. A voltage on this pin above 1 V enables normal operation. Forcing this pin below 0.3 V shuts down the TPS4811x-Q1, reducing quiescent current to approximately 1.6 µA (typical). Optionally connect to the input supply through a resistive divider to set the undervoltage lockout. When EN/UVLO is left floating an internal pull down of 60 nA pulls EN/UVLO low and keeps the device in OFF state.
OV	2	—	I	Adjustable overvoltage threshold input. Connect a resistor ladder from input supply, OV to GND. When the voltage at OV exceeds the overvoltage cut-off threshold then the PD is pulled down to SRC turning OFF the external FET. When the voltage at OV goes below OV falling threshold then PU gets pulled up to BST, turning ON the external FET. OV must be connected to GND when not used. When OV is left floating an internal pull down of 60 nA pulls OV low and keeps PU pulled up to BST.
INP_G	—	2	I	Input Signal. CMOS compatible input reference to GND that sets the state of G pin. INP_G has an internal pull-down to GND to keep G pulled to SRC when INP_G is left floating. Connect INP_G to GND if the G drive functionality is unused.
INP	3	3	I	Input Signal. CMOS compatible input reference to GND that sets the state of PD and PU pins. INP has an internal pull-down to GND to keep PD pulled to SRC when INP is left floating.
FLT_T	4	4	O	Open Drain Fault Output. This pin asserts low when overtemperature fault is detected.
FLT_I	5	5	O	Open Drain Fault Output. This pin asserts low after the voltage on the TMR pin has reached the fault threshold of 1.1 V. This pin indicates the pass transistor is about to turn off due to an overcurrent condition. The FLT_I pin does not go to a high-impedance state until the overcurrent condition and the auto-retry time expire.
GND	6	6	G	Connect GND to system ground.
IMON	7	7	O	Analog current monitor output. This pin sources a scaled down ratio of current through the external current sense resistor R_SNS. A resistor from this pin to GND converts current proportional to voltage. If unused, connect the pin to GND.
IWRN	8	8	I	Overcurrent detection setting. A resistor across IWRN to GND sets the over current comparator threshold. Connect IWRN to GND if overcurrent protection feature is not desired.
TMR	9	9	I	Fault Timer Input. A capacitor across TMR pin to GND sets the time for fault warning, fault turn-off (FLT_I) and retry periods. Leave it open for fastest setting. Connect TMR to GND to disable overcurrent protection.
DIODE	10	10	I	Diode connection for temperature sensing. Connect this pin to base and collector of an MMBT3904 NPN BJT. Connect DIODE to GND, if remote overtemperature protection feature is not desired.
G	—	11	O	GATE of external pre-charge FET. Connect to the GATE of the external FET. Leave the G pin floating if the G drive functionality is unused.
N.C	11	—	—	No connect.
BST	12	12	O	High Side Bootstrapped Supply. An external capacitor with a minimum value of > Q_g(tot) of the external FET must be connected between this pin and SRC.
SRC	13	13	O	Source connection of the external FET.
PD	14	14	O	High Current Gate Driver Pull-Down. This pin pulls down to SRC. For the fastest turn-off, tie this pin directly to the gate of the external high side MOSFET.
PU	15	15	O	High Current Gate Driver Pull-Up. This pin pulls up to BST. Connect this pin to PD for maximum gate drive transition speed. A resistor can be connected between this pin and the gate of the external MOSFET to control the in-rush current during turn-on.
CS-	17	17	I	Current sense negative input.
CS+	18	18	I	Current sense positive input. Connect a 50 - 100-Ω resistor across CS+ to the external current sense resistor.
ISCP	19	19	I	Short-circuit detection threshold setting. Connect ISCP to CS– if short-circuit protection is not desired.
VS	20	20	Power	Supply pin of the controller.