Datasheet

TPS2052C, TPS2062C, TPS2062C-2
TPS2066C, TPS2066C-2, TPS2060C, TPS2064C
TPS2064C-2, TPS2002C, TPS2003C
www.ti.com SLVSAX6G –OCTOBER 2011–REVISED JANUARY 2013
DETAILED DESCRIPTION
OVERVIEW
The TPS20xxC and TPS20xxC-2 dual are current-limited, power-distribution switches providing between 0.5 A
and 2 A of continuous load current in 5-V circuits. These parts use N-channel MOSFETs for low resistance,
maintaining output voltage load regulation. They are designed for applications where short circuits or heavy
capacitive loads are encountered. Device features include UVLO, ON/OFF control (Enable), reverse blocking
when disabled, output discharge when TPS20xxC disabled, overcurrent protection, overtemperature protection,
and deglitched fault reporting. They are pin for pin with existing TI Switch Portfolio.
UNDERVOLTAGE LOCKOUT (UVLO)
The undervoltage lockout (UVLO) circuit disables the power switch when the input voltage is below the UVLO
threshold. Built-in hysteresis prevents unwanted on/off cycling due to input voltage drop from large current
surges. FLTx is high impedance when the TPS20xxC and TPS20xxC-2 dual are in UVLO.
ENABLE (ENx or ENx)
The logic input of ENx or ENx disables all of the internal circuitry while maintaining the power switch OFF. The
supply current of the device can be reduced to less than 1 µA when both switches are disabled. A logic low input
on ENx or a logic high input on ENx enables the driver, control circuits, and power switch of corresponding
channel.
The ENx or ENx input voltage is compatible with both TTL and CMOS logic levels. The FLTx is immediately
cleared and the output discharge circuit is enabled when the device is disabled.
DEGLITCHED FAULT REPORTING
FLTx is an open-drain output that asserts (active low) during an overcurrent or overtemperature condition on
each corresponding channel. The FLTx output remains asserted until the fault condition is removed or the
channel is disabled. The TPS20xxC and TPS20xxC-2 dual eliminates false FLTx reporting by using internal
delay circuitry after entering or leaving an overcurrent condition. The “deglitch” time is typically 10 ms. This
ensures that FLTx is not accidentally asserted under overcurrent conditions with a short time, such as starting
into a heavy capacitive load. Over temperature conditions are not deglitched. The FLTx pin is high impedance
when the device is disabled and in undervoltage lockout (UVLO). The fault circuits are independent so that
another channel continues to operate when one channel is in a fault condition.
OVERCURRENT PROTECTION
The TPS20xxC and TPS20xxC-2 dual responds to overloads by limiting each channel output current to the static
I
OS
levels shown in the Electrical Characteristics table. When an overload condition is present, the device
maintains a constant current (I
OS
) and reduces the output voltage accordingly, with the output voltage falling to
(I
OS
x R
SHORT
). Three possible overload conditions can occur. In the first condition, the output has been shorted
before the device is enabled or before voltage is applied to IN. The device senses over-current and immediately
switches into a constant-current output. In the second condition, a short or an overload occurs while the device is
enabled. At the instant a short -circuit occurs, high currents may flow for several microseconds (t
IOS
) before the
current-limit circuit reacts. The device operates in constant-current mode after the current-limit circuit has
responded. In the third condition, the load is increased gradually beyond the recommended operating current.
The current is permitted to rise until the current-limit threshold is reached. The devices are capable of delivering
current up to the current-limit threshold without damage. Once the threshold is reached, the device switches into
constant-current mode. For all of the above three conditions, the device may begin thermal cycling if the
overcurrent condition persists.
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Product Folder Links: TPS2052C TPS2062C TPS2062C-2 TPS2066C TPS2066C-2 TPS2060C TPS2064C
TPS2064C-2 TPS2002C TPS2003C