MAX16026TE+ Maxim Integrated Products, MAX16026TE+ Datasheet - Page 10

• 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

The MAX16025–MAX16030 feature a pin-selectable
threshold tolerance. Connect TOL to GND to select the
thresholds 5% below the nominal value. Connect TOL to
V
nominal voltage. Do not leave TOL unconnected.
These devices offer several monitoring options with
both fixed and/or adjustable reset thresholds (see
Table 2). For the adjustable threshold inputs, the
threshold voltage (V
typically 0.5V (TOL = GND) or 0.472V (TOL = V
monitor a voltage V
work to the circuit as shown in Figure 3 and use the fol-
lowing equation to calculate the threshold voltage:
Choosing the proper external resistors is a balance
between accuracy and power use. The input to the volt-
age monitor is a high-impedance input with a small
100nA leakage current. This leakage current con-
tributes to the overall error of the threshold voltage
where the output is asserted. This induced error is pro-
portional to the value of the resistors used to set the
threshold. With lower value resistors, this error is
reduced, but the amount of power consumed in the
resistors increases.
Dual-/Triple-/Quad-Voltage, Capacitor-
Adjustable, Sequencing/Supervisory Circuits
Figure 3. Setting the Adjustable Input
10
CC
V
INTH
______________________________________________________________________________________
to select the threshold tolerance 10% below the
R1
R2
IN_
Applications Information
V
INTH
INTH
TH
) at each adjustable IN_ input is
=
, connect a resistive divider net-
V
V
TH
TH
×
⎛
⎜
⎝
1
+
Adjustable Input
R
R
R1 = R2 x
1
2
⎞
⎟
⎠
MAX16025–
MAX16030
(
Tolerance
V
V
INTH
TH
-1
CC
)
). To
The following equation is provided to help estimate the
value of the resistors based on the amount of accept-
able error:
where e
absolute resistive divider error attributable to the input
leakage current (use 0.01 for ±1%), V
age at which the output (OUT_) should assert, and I
the worst-case IN_ leakage current (see the Electrical
Characteristics ). Calculate R2 as follows:
Connect any unused IN_ and EN_ inputs to V
An OUT_ goes low when its respective IN_ input voltage
drops below its specified threshold or when its EN_ goes
low (see Table 1). OUT_ goes high when EN_ is high and
V
MAX16025/MAX16027/MAX16029 feature open-drain,
outputs while the MAX16026/MAX16028/MAX16030
have push-pull outputs. Open-drain outputs require an
external pullup resistor to any voltage from 0 to 28V.
RESET asserts low when any of the monitored voltages
(IN_) falls below its respective threshold, any EN_ goes
low, or MR is asserted. RESET remains asserted for the
reset timeout period after all of the monitored voltages
exceed their respective threshold, all EN_ are high, all
OUT_ are high, and MR is deasserted. The MAX16025/
MAX16027/MAX16029 have an open-drain, active-low
reset output, while the MAX16026/MAX16028/
MAX16030 have a push-pull, active-low reset output.
Open-drain RESET requires an external pullup resistor to
any voltage from 0 to 28V.
All of these parts offer an internally fixed reset timeout
(140ms min) by connecting CRESET to V
timeout can also be adjusted by connecting a capaci-
tor from CRESET to GND. When the voltage at CRESET
reaches 0.5V, RESET goes high. When RESET goes
high, CRESET is immediately held low.
IN_
is above its threshold after a time delay. The
A
is the fraction of the maximum acceptable
Adjustable Reset Timeout Period
R
R
1
2
=
=
e
V
A
INTH
V
TH
×
I
L
V
INTH
×
−
R
V
1
TH
Unused Inputs
RESET Output
OUT_ Output
INTH
CC
(CRESET)
. The reset
is the volt-
CC
.
L
is