SNVS950C April 2014 – July 2016 LM5066I
PRODUCTION DATA.
PIN | DESCRIPTION | |
---|---|---|
NAME | NO. | |
Exposed Pad | Pad | Exposed pad of TSSOP package Solder to the ground plane to reduce thermal resistance |
OUT | 1 | Output feedback Connect to the output rail (external MOSFET source). Internally used to determine the MOSFET VDS voltage for power limiting and to monitor the output voltage. |
GATE | 2 | Gate drive output Connect to the external MOSFET's gate. |
SENSE | 3 | Current sense input The voltage across the current sense resistor (RSNS) is measured from VIN_K to this pin. If the voltage across RSNS reaches overcurrent threshold the load current is limited and the fault timer activates. |
VIN_K | 4 | Positive supply Kelvin pin The input voltage is measured on this pin. |
VIN | 5 | Positive supply input This pin is the input supply connection for the device. |
N/C | 6 | No connection |
UVLO/EN | 7 | Undervoltage lockout An external resistor divider from the system input voltage sets the undervoltage turn-on threshold. An internal 20-µA current source provides hysteresis. The enable threshold at the pin is nominally 2.48 V. This pin can also be used for remote shutdown control. |
OVLO | 8 | Overvoltage lockout An external resistor divider from the system input voltage sets the overvoltage turn-off threshold. An internal 21-µA current source provides hysteresis. The disable threshold at the pin is 2.46 V. |
AGND | 9 | Circuit ground Analog device ground. Connect to GND at the pin. |
GND | 10 | Circuit ground |
SDAI | 11 | SMBus data input pin Data input pin for SMBus. Connect to SDAO if the application does not require unidirectional isolation devices. |
SDAO | 12 | SMBus data output pin Data output pin for SMBus. Connect to SDAI if the application does not require unidirectional isolation devices. |
SCL | 13 | SMBus clock Clock pin for SMBus |
SMBA | 14 | SMBus alert line Alert pin for SMBus, active low |
VREF | 15 | Internal reference Internally generated precision reference used for analog-to-digital conversion. Connect a 1-µF capacitor on this pin to ground for bypassing. |
DIODE | 16 | External diode Connect this to a diode-configured MMBT3904 NPN transistor for temperature monitoring. |
VAUX | 17 | Auxiliary voltage input Auxiliary pin allows voltage telemetry from an external source. Full-scale input of 2.97 V. |
ADR2 | 18 | SMBUS address line 2 Tri-state address line. Should be connected to GND, VDD, or left floating. |
ADR1 | 19 | SMBUS address line 1 Tri-state address line. Should be connected to GND, VDD, or left floating. |
ADR0 | 20 | SMBUS address line 0 Tri-state address line. Should be connected to GND, VDD, or left floating. |
VDD | 21 | Internal sub-regulator output Internally sub-regulated 4.85-V bias supply. Connect a 1-µF capacitor on this pin to ground for bypassing. |
CL | 22 | Current limit range Connect this pin to GND or leave floating to set the nominal over-current threshold at 50 mV. Connecting CL to VDD sets the overcurrent threshold to be 26 mV. |
FB | 23 | Power Good feedback An external resistor divider from the output sets the output voltage at which the PGD pin switches. The threshold at the pin is nominally 2.46 V. An internal 20-µA current source provides hysteresis. |
RETRY | 24 | Fault retry input This pin configures the power up fault retry behavior. When this pin is connected to GND or left floating, the device will continually try to engage power during a fault. If the pin is connected to VDD, the device will latch off during a fault. |
TIMER | 25 | Timing capacitor An external capacitor connected to this pin sets insertion time delay, fault timeout period, and restart timing. |
PWR | 26 | Power limit set An external resistor connected to this pin, in conjunction with the current sense resistor (RSNS), sets the maximum power dissipation allowed in the external series pass MOSFET. |
N/C | 27 | No connection |
PGD | 28 | Power Good indicator An open-drain output. This output is high when the voltage at the FB pin is above VFBTH (nominally 2.46 V) and the input supply is within its undervoltage and overvoltage thresholds. Connect to the output rail (external MOSFET source) or any other voltage to be monitored. |