MAX16052_10 Datasheet, PDF (8/12 Pages) Maxim Integrated Products – High-Voltage, Adjustable Sequencing/Supervisory Circuits

High-Voltage, Adjustable
Sequencing/Supervisory Circuits
V_CC
V_CC
REF
INTERNAL
V_CC/UVLO
REF
INTERNAL
V_CC/UVLO
IN
OUT
IN
0.5V
CONTROL
LOGIC
0.5V
CONTROL
LOGIC
EN
GND
EN
OUT
250nA
1.0V
250nA
1.0V
GND
MAX16052
CDELAY
Figure 2. Simplified Functional Diagram
CDELAY
MAX16053
Detailed Description
The MAX16052/MAX16053 family of high-voltage,
sequencing/supervisory circuits provide adjustable
voltage monitoring for inputs down to 0.5V. These
devices are ideal for use in power-supply sequencing,
reset sequencing, and power-switching applications.
Multiple devices can be cascaded for complex
sequencing applications.
The MAX16052/MAX16053 perform voltage monitoring
using a high-impedance input (IN) with an internally
fixed 0.5V threshold. When the voltage at IN falls below
0.5V or when the enable input is deasserted (EN = low)
OUT goes low. When V_IN rises above 0.5V and the
enable input is asserted (EN = high), OUT goes high
after a capacitor-adjustable time delay.
With V_IN above 0.5V, the enable input can be used to
turn on or off the output. Table 1 details the output state
depending on the various input and enable conditions.
Table 1. MAX16052/MAX16053
IN
V_IN < V_TH
V_IN < V_TH
V_IN > V_TH
V_IN > V_TH
EN
Low
High
Low
High
OUT
Low
Low
Low
OUT = High Impedance
(MAX16052)
OUT = V_CC (MAX16053)
Supply Input (V_CC)
The device operates with a V_CC supply voltage from
2.25V to 28V. In order to maintain a 1.8% accurate
threshold at IN, V_CC must be above 2.25V. When V_CC
falls below the UVLO threshold, the output deasserts
low. When V_CC falls below 1.2V, the output state is not
guaranteed. For noisy systems, connect a 0.1µF
ceramic capacitor from V_CC to GND as close to the
device as possible.
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