MAX16026TE+ Maxim Integrated Products, MAX16026TE+ Datasheet - Page 11

• Manufacturer Part Number: MAX16026TE+
• Description: IC SUPERVISORY CIRC DL 16TQFN
• Manufacturer: Maxim Integrated Products
• Type: Sequencerr

Specifications of MAX16026TE+

• Number Of Voltages Monitored: 2
• Output: Push-Pull, Totem Pole
• Reset: Active Low
• Reset Timeout: 140 ms/Adjustable Minimum
• Voltage - Threshold: 9 Selectable Threshold Combinations
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Undervoltage Threshold: Adjustable
• Overvoltage Threshold: Adjustable
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Supply Voltage (max): 28 V
• Supply Voltage (min): 2.2 V
• Supply Current (typ): 52 uA
• Maximum Power Dissipation: 2000 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Calculate the reset timeout period as follows:
where V
seconds, and C
accuracy and proper operation, minimize leakage at
C
When V
250nA current source begins charging an external
capacitor connected from CDLY_ to GND. When the
voltage at CDLY_ reaches 1V, OUT_ goes high. When
OUT_ goes high, CDLY_ is immediately held low.
Adjust the delay (t
V
the equation:
where V
Farads, t
nal propagation delay of the device. To ensure timing
accuracy and proper operation, minimize leakage
at CDLY.
Many µP-based products require manual-reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic-low on MR
asserts RESET low. RESET remains asserted while MR
is low and during the reset timeout period (140ms fixed
or capacitor adjustable) after MR returns high. The MR
input has a 500nA internal pullup, so it can be left
unconnected, if not used. MR can be driven with TTL or
CMOS logic levels, or with open-drain/collector outputs.
Connect a normally open momentary switch from MR to
GND to create a manual-reset function. External
TH
CRESET
(with EN_ high) to OUT_ going high according to
t
IN
t
Adjustable, Sequencing/Supervisory Circuits
TH-CDLY
TH-RESET
RP
DELAY
.
DELAY
rises above V
=
V
I
CH RESET
TH RESET
=
is in seconds, and t
CRESET
is 1V, I
−
−
V
I
is 0.5V, I
______________________________________________________________________________________
CH CDLY
TH CDLY
DELAY
−
−
Adjustable Delay (CDLY_)
Manual-Reset Input ( MR )
CH-CDLY
is in Farads. To ensure timing
TH
×
Dual-/Triple-/Quad-Voltage, Capacitor-
) from when V
C
CH-RESET
CRESET
with EN_ high, the internal
×
C
CDLY
is 0.25µA, C
DELAY+
+
+
is 0.5µA, t
35 10
35 10
×
IN
×
rises above
is the inter-
−
6
CDLY
−
6
RP
is in
is in
debounce circuitry is not required. If MR is driven from
long cables or if the device is used in a noisy environ-
ment, connect a 0.1µF capacitor from MR to GND to
provide additional noise immunity.
The exact value of the pullup resistors for the open-
drain outputs is not critical, but some consideration
should be made to ensure the proper logic levels
when the device is sinking current. For example, if
V
sink current less than 0.5mA as shown in the Electrical
Characteristics table. As a result, the pullup resistor
should be greater than 56kΩ. For a 12V pullup, the
resistor should be larger than 24kΩ. Note that the ability
to sink current is dependent on the V
The device operates with a V
2.2V to 28V. When V
all the outputs go low and stay low until V
1.2V. For noisy systems or fast rising transients on V
connect a 0.1µF ceramic capacitor from V
as close to the device as possible to provide better
noise and transient immunity.
When V
sink current decreases. In order to ensure a valid out-
put as V
OUT/RESET to GND.
Figures 4 and 5 show typical applications for the
MAX16025–MAX16030. In high-power applications,
using an n-channel device reduces the loss across the
MOSFETs as it offers a lower drain-to-source on-resis-
tance. However, an n-channel MOSFET requires a suffi-
cient V
The application in Figure 4 shows the MAX16027 con-
figured in a multiple-output sequencing application.
Figure 5 shows the MAX16029 in a power-supply
sequencing application using n-channel MOSFETs.
0V (MAX16026/MAX16028/MAX16030 Only)
CC
Ensuring Valid Output with V
= 2.25V and the pullup voltage is 28V, keep the
GS
CC
CC
voltage to fully enhance it for a low R
falls below 1.2V, the ability for the output to
falls to 0V, connect a 100kΩ resistor from
Typical Application Circuits
CC
Power-Supply Bypassing
falls below the UVLO threshold,
Pullup Resistor Values
CC
supply voltage from
CC
supply voltage.
CC
CC
CC
falls below
Down to
to GND
DS_ON
CC
11
,
.