TC1302A_13 Datasheet, PDF (13/26 Pages) Microchip Technology – Low Quiescent Current Dual Output LDO

5.9 TC1302A SHDN2 Timing
V_OUT1 will rise independent of the level of SHDN2 for
the TC1302A. Figure 5-1 is used to define the wake-up
time from shutdown (t_WK) and the settling time (t_S). The
wake-up time is dependant upon the frequency of
operation. The faster the SHDN pin is pulsed, the
shorter the wake-up time will be.
V_IN
SHDN2
t_s
t_wk
V_OUT1
V_OUT2
TC1302A/B
5.11 Device Protection
5.11.1 OVERCURRENT LIMIT
In the event of a faulted output load, the maximum
current the LDO output will permit to flow is limited
internally for each of the TC1302A/B outputs. The peak
current limit for V_OUT1 is typically 1.1A, while the peak
current limit for V_OUT2 is typically 0.5A. During short-
circuit operation, the average current is limited to
200 mA for V_OUT1 and 140 mA for V_OUT2.
5.11.2
OVERTEMPERATURE
PROTECTION
If the internal power dissipation within the TC1302A/B
is excessive due to a faulted load or higher-than-
specified line voltage, an internal temperature-sensing
element will prevent the junction temperature from
exceeding approximately 150°C. If the junction
temperature does reach 150°C, both outputs will be
disabled until the junction temperature cools to
approximately 140°C and the device resumes normal
operation. If the internal power dissipation continues to
be excessive, the device will again shut off.
FIGURE 5-1:
TC1302A Timing.
5.10 TC1302B SHDN1/SHDN2 Timing
For the TC1302B, the SHDN1 input pin is used to
control V_OUT1. The SHDN2 input pin is used to control
V_OUT2, independent of the logic input on SHDN1.
V_IN
t_s
t_wk
SHDN1
V_OUT1
SHDN2
V_OUT2
FIGURE 5-2:
TC1302B Timing.
 2003-2012 Microchip Technology Inc.
DS21333C-page 13