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PM6680ATR bảng dữ liệu(PDF) 28 Page - STMicroelectronics

tên linh kiện PM6680ATR
Giải thích chi tiết về linh kiện  Dual synchronous step-down controller with adjustable output voltages plus LDO
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PM6680ATR bảng dữ liệu(HTML) 28 Page - STMicroelectronics

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Device description
PM6680A
28/48
7.11
Power up sequencing and operative modes
Let us consider SHDN, EN1 and EN2 low at the beginning. An external voltage is applied as
input voltage. The device is in shutdown mode.
When the SHDN pin voltage is above the shutdown device on threshold (1.5 V typ.), the
controller begins the power-up sequence. All the latched faults are cleared. LDO5
undervoltage control is blanked for 4 ms and the internal regulator LDO5 turns on. If the
LDO5 output is above the UVLO threshold after this time, the device enters in standby
mode. The switching outputs are kept to ground by turning on the low side MOSFETs.
When EN1 and EN2 pins are forced high the switching sections begin their soft start
sequence.
Table 8.
Operatives modes
Mode
Conditions
Description
Run
SHDN is high,
EN1/EN2 pins are high
Switching regulators are enabled; internal linear
regulators outputs are enabled.
Standby
Both EN1/EN2 pins are low
and SHDN pin is high
Internal Linear regulators active (LDO5 is always on).
In Standby mode LGATE1/LGATE2 pins are forced
high while HGATE1/HGATE2 pins are forced low.
Shutdown
SHDN is low
All circuits off.



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