Features: Features of the SP2026 device include current limiting, a +2.4V undervoltage lockout,overtemperature shutdown, error flag output,soft start, a switch-on resistance of 100m and a supply current of 100mA. The SP2026-1 device has an active-high enable. The SP2026-2 device has an active-low enable.
ApplicationBypass Capacitors
A 0.1F to 1.0F bypass capacitor from the IN pin to the GND pin is recommended to control power supply transients. Refer to Figure 4. Without a bypass capacitor, an output short may cause sufficient ringing and damage the device. Without a bypass capacitor, excessive supply lead inductance is also a concern.
Input or output transients must not exceed the absolute maximum supply voltage of VIN(MAX) =+6.0V even for a short duration to avoid risk of damage to the device.
Soft Start Condition
The soft start feature of the SP2026 is implemented by holding the output turn-on rise time to 1ms. When off, the device has high impedance MOSFET channels that slowly become low impedance as the device powers on. This prevents an inrush current from causing voltage drops that result from charging a capacitive load and can pull the USB voltage bus below specified levels. This satisfies the USB voltage droop requirements for bus-powered applications.Refer to the circuit in Figure 6.
The SP2026 can provide inrush current limiting for applications with large load capacitances where CBULK > 10F. Refer to the circuit in Figure 7 for a configuration that will meet USB transient regulation specifications with large load capacitances.
Enable Input
The ENA and ENB control pins must be driven to a logic high or logic low for a clearly defined signal input. Floating these control lines maycause unpredictable operation.
Pinout
SpecificationsSupply Voltage ............................................. -0.3V, +6.0V
Operating Temperature ....................... -40°C to +85°C
Storage Temperature ........................ -65°C to +150°C
Power Dissipation Per Package 8-pin NSOIC
derate 6.14mW/OC above+70OC) ......................500mW
8-pin PDIP
(derate 11.8mW/OC above+70OC). ..................1000mW
Fault Flag Voltage .................................................... +6V
Fault Flag Current ..................................................25mA
Output Voltage ........................................................ +6V
Output Current .................................. Internally Limited
Enable Input ....................................... -0.3V to VIN +3VDescriptionThe SP2026 is a dual +2.7V to +5.5V supervisory power control switch that is current limited to 1.25A and has thermal shutdown to protect itself and the load. A device is disabled in thermal shutdown until the excessive current load is removed, the appropriate enable pins are toggled, or the die temperature cools to 120°C. The undervoltage lockout feature disables the output switches until a valid input voltage, VIN = 2.4V, is present. Once a valid input voltage is present and the SP2026 is enabled, a 1ms soft start prevents momentary voltage drops caused by charging a capacitive load. The SP2026 has a low on resistance, 100m, and supplies a 500mA minimum output current per switch. In overcurrent and thermal shutdown,error flags may be asserted for overtemperature.
SP2026 Data Sheet
