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LM60440 bảng dữ liệu(PDF) 10 Page - Texas Instruments

tên linh kiện LM60440
Giải thích chi tiết về linh kiện  LM604x0 3.8-V to 36-V, 3-A, and 4-A Ultra-Small Synchronous Step-Down Converter
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LM60440 bảng dữ liệu(HTML) 10 Page - Texas Instruments

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High = Power Good
VOUT
PG
Low = Fault
(95%)
(93%)
(107%)
(105%)
VPG-HIGH_UP
VPG-HIGH-DN
VPG-LOW-UP
VPG-LOW-DN
10
LM60440, LM60430
SNVSBN5A – FEBRUARY 2020 – REVISED JUNE 2020
www.ti.com
Product Folder Links: LM60440 LM60430
Submit Documentation Feedback
Copyright © 2020, Texas Instruments Incorporated
8.3 Feature Description
8.3.1 Power-Good Flag Output
The power-good flag function (PG output pin) of the LM604x0 can be used to reset a system microprocessor
whenever the output voltage is out of regulation. This open-drain output goes low under fault conditions, such as
current limit and thermal shutdown, as well as during normal start-up. A glitch filter prevents false flag operation
for short excursions of the output voltage, such as during line and load transients. The timing parameters of the
glitch filter are found in the Electrical Characteristics table. Output voltage excursions lasting less than tPG do not
trip the power-good flag. Power-good operation can best be understood by reference to Figure 1 and Figure 2.
Note that during initial power up, a delay of about 4 ms (typical) is inserted from the time that EN is asserted to
the time that the power-good flag goes high. This delay only occurs during start-up and is not encountered during
normal operation of the power-good function.
The power-good output consists of an open-drain NMOS, requiring an external pullup resistor to a suitable logic
supply. It can also be pulled up to either VCC or VOUT, through a 100-kΩ resistor, as desired. If this function is
not needed, the PG pin must be left floating. When EN is pulled low, the flag output is also forced low. With EN
low, power good remains valid as long as the input voltage is
≥ 2 V (typical). Limit the current into the power-
good flag pin to less than 5 mA D.C. The maximum current is internally limited to about 35 mA when the device
is enabled and about 65 mA when the device is disabled. The internal current limit protects the device from any
transient currents that can occur when discharging a filter capacitor connected to this output.
Figure 1. Static Power-Good Operation


Số phần tương tự - LM60440_V01

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Mô tả tương tự - LM60440_V01

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