Datasheet

TPS7A6033-Q1, TPS7A6050-Q1
TPS7A6133-Q1, TPS7A6150-Q1
www.ti.com SLVSA62G –MARCH 2010–REVISED MARCH 2012
Low Power Mode protects them from excessive power dissipation. For
example, during a short circuit condition on the
At light loads and high input voltages (V
IN
>~8V such
output; current through the pass element is limited to
that charge pump is off) the device operates in Low
I
CL
to protect the device from excessive power
Power Mode and the quiescent current consumption
dissipation.
is reduced to 25µA (typical) as shown in Table 1.
Thermal Shutdown
Table 1. Typical Quiescent Current Consumption
These devices incorporate a thermal shutdown (TSD)
I
OUT
Charge Pump ON Charge Pump OFF
circuit as a protection from overheating. For
I
OUT
< ~2mA 25 µA
250 µA
continuous normal operation, the junction
(Light load) (Low Power Mode)
temperature should not exceed TSD trip point. If the
I
OUT
> ~2mA
280 µA 70 µA
junction temperature exceeds TSD trip point, the
(Heavy load)
output is turned off. When the junction temperature
falls below TSD trip point, the output is turned on
Under Voltage Shutdown
again. This is shown in Figure 11.
These devices have an integrated under voltage lock
out (UVLO) circuit to shutdown the output if the input
voltage (V
IN
) falls below an internally fixed UVLO
threshold level (V
IN-UVLO
). This ensures that the
regulator is not latched into an unknown state during
low input voltage conditions. The regulator will power
up when the input voltage exceeds V
IN(POWERUP)
level.
Low Voltage Tracking
At low input voltages the regulator drops out of
regulation, the output voltage tracks input minus a
voltage based on the load current (I
OUT
) and switch
resistance (R
SW
). This allows for a smaller input
capacitor and can possibly eliminate the need of
using a boost convertor during cold crank conditions.
Integrated Fault Protection
These devices feature an integrated fault protection
to make them ideal for use in automotive
Figure 11. Thermal Cycling Waveform for
applications. In order to keep them in safe area of
TPS7A6050 (V
IN
= 24 V, I
OUT
= 300 mA, V
OUT
= 5 V)
operation during certain fault conditions, internal
current limit protection and current limit fold back are
used to limit the maximum output current. This
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