Can ship immediately
Due to market price fluctuations,if you need to purchase or consult the price.You can contact us or emial to us: brenda@hongda-ic.com
1. Describe
The eFuse (Integrated FET Hot Swap Device) family is a highly integrated circuit protection and power management solution in a small package. These devices offer multiple protection modes with minimal external components and are robust against overloads, short circuits, voltage surges, and excessive inrush currents. The output current limit level can be set with a single external resistor. The output load current can also be accurately detected by measuring the voltage drop across the current limiting resistor. Applications with special inrush current requirements can use a single external capacitor to set the output slew rate. Overvoltage events are quickly limited to a safe fixed maximum value by an internal clamp circuit without the need for external components. The TPS259573 variant provides an option to set a user-defined overvoltage cutoff threshold. The fast output discharge function can be implemented in the TPS259525DSGR variant by connecting the OUT pin to the QOD pin. These devices are characterized for operation over a temperature range of –40°C to +125°C.
2. Feature
1. Wide input voltage range: 2.7 V to 18 V
– 20 V absolute maximum
– TPS2595x5 version is 3 V to 18 V
2. Low on-resistance: RON = 34 mΩ (typ)
3. Fast overvoltage protection clamps (3.8-V, 5.7-V, and 13.7V options) with a response time of 5 µs (typ.)
4. TPS2595x0, TPS2595x1, TPS2595x5: active high Enable input with adjustable undervoltage Lock (UVLO)
5. TPS2595x3: Active low enable input with Adjustable Overvoltage Lockout (OVLO)
6. Adjustable current limit with load current Monitor output (ILM)
– Current range: 0.5 A to 4 A
– Current limiting accuracy: ±7.5%
7. Adjustable output slew rate control (dVdt)
8. Over Temperature Protection (OTP)
9. Fault indication pin (FLT)
10. UL 2367 Recognized - File No. E169910
– RILM >= 487 Ω (4.42 A max)
11. IEC 62368-1 certification
12. Safety during single point failure testing (IEC 62368-1)
– ILM pin open/short detection
3. Application
1. Hot plug, hot plug
2. Adapter power supply system
3. Multifunction printer
4. SSDs and HDDs
5. Industrial Systems
6. White goods
7. Set-top box
8. Digital Television
4. Pin configuration
5. Pin Description
6. Function Description
All TPS259525DSGR devices continuously monitor the input supply to ensure that the load is powered only when the voltage is at a sufficient level. In a start-up condition, the device waits for the input supply to rise above a fixed threshold, VUVP, before continuing to turn on the FET. Likewise, in the ON condition, if the input is below the UVP threshold, the FET is turned off. The UVP rising and falling thresholds are slightly different to provide some hysteresis and ensure stable operation around the threshold voltage. The TPS2595x0, TPS2595x1, TPS2595x5 devices provide a user-programmable UVLO mechanism to ensure that the load is powered only when the voltage is at a sufficient level. This can be achieved by dividing the input supply and feeding it to the EN/UVLO pin. Whenever the voltage on the EN/UVLO pin falls below the threshold VUVLO, the device turns off the FET. When the voltage rises above the threshold, the FET turns on again. The rising and falling thresholds on this pin are slightly different to provide some hysteresis and ensure stable operation around the threshold voltage.
The TPS25952x, TPS25953x, TPS25954x devices provide a mechanism to quickly clamp the output voltage to a predefined level when the input voltage exceeds a certain threshold. This ensures that the load is not exposed to high voltages due to any overvoltage on the input supply and in this case reduces the reliance on external protection devices such as TVS/Zener diodes. Once the input supply voltage rises above the OVC threshold voltage, VOVC, the device responds by clamping the voltage to VCLAMP within a very short response time, tOVC. As long as an overvoltage condition exists on the input, the output voltage is clamped to VCLAMP. When the input falls below the output clamp threshold, VOVC, the clamp releases the output voltage.
During a transient short circuit event, the current through the device increases very rapidly. The short-circuit threshold ISC is adjusted according to the selected current limit. When a short circuit is detected, the device quickly limits the current to ILIMIT. Once the load current falls below the programmed ILIMIT threshold, the device stops limiting current. The output voltage drops at the current limiting state, resulting in increased power dissipation in the internal FET and leads to a thermal shutdown if the condition persists for an extended period of time. In this case, the device either stays latched-off or starts an auto retry cycle as explained in the Overtemperature Protection (OTP) section.
Some applications require the output capacitor to be discharged quickly when the eFuse is turned off. This prevents any unpredictable behavior from the downstream devices as the capacitor discharges slowly. The TPS2595x5 device provides a Quick Output Discharge feature that can be enabled by connecting OUT pin to QOD pin. An internal FET provides a fast discharge path for the output capacitor resulting in the OUT voltage falling to 0 V in a short time. The FET initially operates in saturation region and provides a constant current discharge. After the FET enters linear region, it offers a discharge path similar to a resistor.
7. Application Information
The TPS259525DSGR device is an integrated electronic fuse typically used in hot swap and power rail protection applications. The device operates from 2.7 V to 18 V with programmable current limit and undervoltage protection. The device helps control inrush current and provides accurate current limit during overload conditions suitable for systems such as set-top boxes, DTVs, game consoles, SSDs, HDDs and smart meters. The device also provides robust protection against multiple faults on the subsystem rails.
