Philips Semiconductors Product specification
TOPFET high side switch BUK205-50Y
SMD version of BUK201-50Y
PROTECTION FUNCTIONS AND STATUS INDICATIONS
Truth table for normal, open-circuit load and overload conditions and abnormal supply voltages.
FUNCTIONS TRUTH TABLE THRESHOLD
SYMBOL CONDITION INPUT STATUS OUTPUT MIN. TYP. MAX. UNIT
Normal on-state 1 1 1
Normal off-state 0 1 0
IL(OC) Open circuit load11 0 1 100 350 600 mA
Open circuit load 0 1 0
Tj(TO) Over temperature21 0 0 150 175 - ˚C
Over temperature300 0
V
BL(TO) Short circuit load41 0 0 9 10.5 12 V
Short circuit load 0 1 0
VBG(TO) Low supply voltage5X1 0345V
V
BG(LP) High supply voltage6X1 0404550V
For input ‘0’ equals low, ‘1’ equals high, ‘X’ equals don’t care.
For status ‘0’ equals low, ‘1’ equals open or high.
For output switch ‘0’ equals off, ‘1’ equals on.
STATUS CHARACTERISTICS
Tmb = 25 ˚C.
The status output is an open drain transistor, and requires an external pull-up circuit to indicate a logic high.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
VSG Status clamping voltage IS = 100 µA; VIG = 0 V 6 7 8 V
VSG Status low voltage IS = 50 µA; VBG = 13 V; VIG = 5 V - 0.7 0.8 V
ISStatus leakage current VSG = 5 V - 0.1 1 µA
ISStatus saturation current7VSS = 5 V; RS = 0 Ω; VBG = 13 V - 5 - mA
Application information
RSExternal pull-up resistor8VSS = 5 V - 100 - kΩ
1 In the on-state, the switch detects whether the load current is less than the quoted open load threshold current. This is for status indication
only. Typical hysteresis equals 140 mA. The thresholds are specified for supply voltage within the normal working range.
2 After cooling below the reset temperature the switch will resume normal operation. The reset temperature is lower than the trip temperature by
typically 10 ˚C.
3 If the overtemperature protection has operated, status remains low to indicate the overtemperature condition even if the input is taken low,
providing the device has not cooled below the reset temperature.
4 After short circuit protection has operated, the input voltage must be toggled low for the switch to resume normal operation.
5 Undervoltage sensor causes the device to switch off. Typical hysteresis equals 0.7 V.
6 Overvoltage sensor causes the device to switch off to protect the load. Typical hysteresis equals 1.3 V.
7 In a fault condition with the pull-up resistor short circuited while the status transistor is conducting.
8 The pull-up resistor also protects the status pin during reverse battery conditions.
July 1996 4 Rev 1.000