TC1301A_08 Datasheet, PDF (16/28 Pages) Microchip Technology – Dual LDO with Microcontroller RESET Function

TC1301A/B
5.14 TC1301B RESET Timing
The timing waveforms for the TC1301B RESET output
are shown in Figure 5-4. Note that the RESET
threshold input for the TC1301B is V_OUT1. The V_OUT1
to RESET threshold detector connection is made
internal in the case of the TC1301B.
V_IN
V_TH
V_OUT1
RESET Time
V_OH
RESET
1V
T_RPD
V_OL
FIGURE 5-4:
TC1301B RESET Timing.
5.15 Device Protection
5.15.1 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 TC1301A/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.The V_DET
and RESET circuit will continue to operate in the event
of an overcurrent on either output for the TC1301A.
The voltage detect and RESET circuit will continue to
operate in the event of an overcurrent on V_OUT1 (or
V_OUT2) for the TC1301B. In the event of an overcurrent
on V_OUT1, the RESET will detect the absence of V_OUT1.
5.15.2 OVERTEMPERATURE
PROTECTION
If the internal power dissipation within the TC1301A/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. The device will resume normal
operation. If the internal power dissipation continues to
be excessive, the device will again shut off. The V_DET
and RESET circuit will continue to operate normally
during an overtemperature fault condition for both the
TC1301A and TC1301B.
DS21798C-page 16
© 2008 Microchip Technology Inc.