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ZHCSEK7D June 2015 – May 2021 LM53600-Q1 , LM53601-Q1

PRODUCTION DATA

封裝選項

機械數據 (封裝 | 引腳)

DSX|10
- MPDS565C

散熱焊盤機械數據 (封裝 | 引腳)

DSX|10
- QFND662

訂購信息

8.3.5 RESET Function

While the reset function of the LM53600-Q1 and LM53601-Q1 devices resembles a standard power good function, its functionality is designed to replace a discrete reset IC, reducing BOM cost. There are three major differences between the reset function and the normal power good function seen in most regulators:

A delay has been added for release of reset. See waveforms below.
RESET output signals a fault (pulls its output to ground) while the part is disabled.
RESET continues to operate with input voltage as low as 1.5 V. Below this input voltage, RESET output may be high impedance.

Figure 8-5 Reset Output Function Operation

The following table summarizes conditions that cause a fault to be flagged by RESET . Once a fault is flagged, RESET will not be released (become high impedance) until either there is no fault for t_{reset_act} or VIN drops below V_{reset_valid}.

Table showing conditions that cause RESET to signal a fault (pull low).

FAULT CONDITION INITIATED	FAULT CONDITION ENDS (AFTER WHICH T_{reset_act} MUST PASS BEFORE RESET OUTPUT IS RELEASED)
FB below V_{reset_UV} for longer than t_{reset_filt}	FB above V_{reset_UV} + V_{reset_hyst} for longer than t_{reset_filt}
FB above V_{reset_OV} for longer than t_{reset_filt}	FB below V_{reset_OV} - V_{reset_hyst} for longer than t_{reset_filt}
Junction temperature exceeds T_SD	Junction temperature falls below T_SD – T_{SD_hyst}
EN low	t_EN passes after EN becomes high⁽¹⁾
VIN falls below V_{in_UVLO} - V_{in_UVLO _hyst} or VCC pin falls below V_{cc_UVLO} - V_{cc_UVLO_hyst}	Voltage on V_IN exceeds V_{in_UVLO} and VCC exceed V_{cc_UVLO}

(1) As an additional safety feature, RESET remains low until approximately 1ms after soft start ends even if all other conditions in this table are met and t_{reset_act} has passed. Lockout during soft start does not require t_{reset_act} to pass before RESET is released.

The threshold voltage for the RESET function is specified taking advantage of the availability of the LM53600-Q1 internal feedback threshold to the RESET circuit. This allows a maximum threshold of 97% of selected output voltage to be specified at the same time as 95.7% of actual operating point. The net result is a more accurate reset function while expanding the system allowance for transient response without the need for extremely accurate internal circuitry. See output voltage error stack up comparison, below.

Figure 8-6 Reset Threshold Voltage Stack Up