The TPS25982 family of eFuses is a highly integrated circuit protection and power management solution in a small package. The devices are operational over a wide input voltage range. A single part caters to low-voltage systems needing minimal I*R voltage drop as well as higher voltage, high current systems needing low power dissipation. They are a robust defense against overloads, short-circuits, voltage surges and excessive inrush current.
Overvoltage events are limited by internal cutoff circuits, with multiple device options to choose the overvoltage threshold.
Multiple device options exist to choose between the response to overcurrent conditions, circuit breaker or active current limiter. The overcurrent limit and fast-trip (short-circuit) threshold can be set with a single external resistor. The devices intelligently manage the overcurrent response by distinguishing between transient events and actual faults, thereby allowing the system to function uninterrupted during line and load transients without compromising on the robustness of the protection against faults. The device can be configured to stay latched off or retry automatically after a fault shutdown. The number of auto-retries as well as the retry delay are configurable with capacitors. This enables remote systems to automatically recover from temporary faults while ensuring that power supplies are not stressed indefinitely due to a persistent fault.
The TPS25982 devices are available in a small 4 mm × 4 mm QFN package. The devices are characterized for operation over a junction temperature range of –40˚C to 125˚C.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS25982 | QFN (24) | 4.0 mm × 4.0 mm |
Changes from B Revision (January 2020) to C Revision
Changes from A Revision (June 2019) to B Revision
Changes from * Revision (October 2018) to A Revision
PART NUMBER | OVERVOLTAGE LOCKOUT THRESHOLD | OVERCURRENT RESPONSE |
---|---|---|
TYPICAL (V) | ||
TPS259822LNRGE | 3.7 | Active Current Limiter |
TPS259823LNRGE | 7.6 | Active Current Limiter |
TPS259824LNRGE | 16.9 | Active Current Limiter |
TPS259827LNRGE | No OVLO | Active Current Limiter |
TPS259822ONRGE | 3.7 | Circuit Breaker |
TPS259823ONRGE | 7.6 | Circuit Breaker |
TPS259824ONRGE | 16.9 | Circuit Breaker |
TPS259827ONRGE | No OVLO | Circuit Breaker |
PIN | TYPE | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
OUT | 17, 18, 19, 20, 21, 22, 23, 24 | Power | Power Output |
IN | 1, 2, 3, 16, Pad 1 | Thermal / Power | Power Input. The exposed pad must be soldered to input power plane uniformly to ensure proper heat dissipation and to maintain optimal current distribution through the device. |
GND | 4, 5, 14,
Pad 2 |
Ground | Connect to System Ground |
EN/UVLO | 6 | Analog Input | Active High Enable for the device. A resistor divider on this pin from input supply to GND can be used to adjust the Undervoltage Lockout threshold. Do not leave floating. |
ITIMER | 7 | Analog Output | A capacitor from this pin to GND sets the overcurrent blanking interval during which the output current can temporarily exceed set current limit (but lower than fast-trip threshold) before the device overcurrent response takes action. Leave this pin open for fastest response to overcurrent events. Refer to ITIMER Functional Mode Summary for more details. |
ILIM | 8 | Analog Output | An external resistor from this pin to GND sets the output current limit threshold and fast trip threshold. Do not leave floating. |
IMON | 9 | Analog Output | Analog output load current monitor. This pin sources a current proportional to the load current. This can be converted to a voltage signal by connecting an appropriate resistor from this pin to GND. |
RETRY_DLY | 10 | Analog Output | A capacitor from this pin to GND sets the time period that has to elapse after a fault shutdown before the device attempts to restart automatically. Connect this pin to GND for latch-off operation (no auto-retries) after a fault. Refer to Fault Response section for more details. |
NRETRY | 11 | Analog Output | A capacitor from this pin to GND sets the number of times the part attempts to restart automatically after shutdown due to fault. Connect this pin to GND if the part should retry indefinitely. Refer to Fault Response section for more details. |
LDSTRT | 12 | Analog Input | Load Detect/Handshake Signal. A capacitor from this pin to GND sets the time period after PG assertion within which the pin has to be pulled low for the device to remain ON. Connect to GND if the load detect/handshake feature is not used. Refer to Load Detect/Handshake (LDSTRT) section for more details. Do not leave floating. |
PG | 13 | Digital Output | Active High Power Good Indication. This pin is asserted when the FET is fully enhanced and output has reached maximum voltage. It is an open drain output that requires an external pull-up resistor to an external supply. This pin remains logic low when VIN < VUVP. |
dVdt | 15 | Analog Output | A capacitor from this pin to GND sets the output turn on slew rate. Leave this pin floating for the fastest slew rate during start up. |