The TPS25923x family of eFuses is a highly integrated circuit protection and power management solution in a tiny package. The devices use few external components and provide multiple protection modes. They are a robust defense against overloads, shorts circuits, voltage surges, excessive inrush current, and reverse current.
Current limit level can be set with a single external resistor. Over voltage events are limited by internal clamping circuits to a safe fixed maximum, with no external components required. Applications with particular voltage ramp requirements can set dV/dT with a single capacitor to ensure proper output ramp rates.
Many systems, such as SSDs, must not allow holdup capacitance energy to dump back through the FET body diode onto a drooping or shorted input bus. The BFET pin is for such systems. An external NFET can be connected “Back to Back (B2B)” with the TPS25923x output and the gate driven by BFET to prevent current flow from load to source (see Figure 43).
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS259230 | VSON (10) | 3.00 mm × 3.00 mm |
TPS259231 |
Changes from A Revision (August 2015) to B Revision
Changes from * Revision (August 2015) to A Revision
PART NUMBER | UV | OV CLAMP | FAULT RESPONSE | STATUS |
---|---|---|---|---|
TPS259231 | 4.3 V | 6.1 V | Auto Retry | Active |
TPS259230 | 4.3 V | 6.1 V | Latched | Active |
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
BFET | 9 | O | Connect this pin to the gate of a blocking NFET. See the Feature Description section. Leave this pin floating if it is not used |
dV/dT | 1 | O | Tie a capacitor from this pin to GND to control the ramp rate of OUT at device turnon |
EN/UVLO | 2 | I | This is a dual function control pin. When used as an ENABLE pin and pulled down, it shuts off the internal pass MOSFET and pulls BFET to GND. When pulled high, it enables the device and BFET. As an UVLO pin, it can be used to program different UVLO trip point via external resistor divider |
GND | Thermal Pad | — | GND |
ILIM | 10 | O | A resistor from this pin to GND sets the overload and short circuit limit |
OUT | 6-8 | O | Output of the device |
VIN | 3-5 | I | Input supply voltage |