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PDF MAX16041 Data sheet ( Hoja de datos )
| Número de pieza | MAX16041 | |
| Descripción | Sequencing/Supervisory Circuits | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX16041 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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19-0622; Rev 0; 8/06
Dual-/Triple-/Quad-Voltage, Capacitor-
Adjustable, Sequencing/Supervisory Circuits
General Description
The MAX16041/MAX16042/MAX16043 are dual-/triple-/
quad-voltage monitors and sequencers that are offered
in a small thin QFN package. These devices offer enor-
mous design flexibility as they allow fixed and
adjustable thresholds to be selected through logic
inputs and provide sequence timing through small
external capacitors. These versatile devices are ideal
for use in a wide variety of multivoltage applications.
As the voltage at each monitored input exceeds its
www.DraetsapSheecetitv4Ue.ctohmreshold, its corresponding output goes
high after a propagation delay or a capacitor-set time
delay. When a voltage falls below its threshold, its
respective output goes low after a propagation delay.
Each detector circuit also includes its own enable input,
allowing the power-good outputs to be shut off inde-
pendently. The independent output for each detector
has an open-drain configuration capable of supporting
voltages up to 28V, thereby allowing them to interface
to shutdown and enable inputs of various DC-DC regu-
lators. Each detector can operate independently as four
separate supervisory circuits or can be daisy-chained
to provide controlled power-supply sequencing.
The MAX16041/MAX16042/MAX16043 also include a
push-pull reset function that deasserts only after all of
the independently monitored voltages exceed their
threshold. The reset timeout is internally fixed or can be
adjusted externally. These devices are offered in a
4mm x 4mm TQFN package and are fully specified
from -40°C to +125°C.
Applications
Multivoltage Systems
DC-DC Supplies
Servers/Workstations
Storage Systems
Networking/Telecommunication Equipment
Selector Guide
PART
MAX16041
MAX16042
MAX16043
MONITORED INDEPENDENT
VOLTAGES
OUTPUTS
2 2 (Open-drain)
3 3 (Open-drain)
4 4 (Open-drain)
RESET
OUTPUT
Push-pull
Push-pull
Push-pull
Features
o 2.2V to 28V Operating Voltage Range
o Fixed Thresholds for 3.3V, 2.5V, 1.8V, 1.5V, and
1.2V Systems
o 1.5% Accurate Adjustable Threshold Monitors
Voltages Down to 0.5V
o 2.7% Accurate Fixed Thresholds Over
Temperature
o Fixed (140ms min)/Capacitor-Adjustable Delay
Timing
o Independent Open-Drain Outputs/Push-Pull
RESET Output
o Enable Inputs for Each Monitored Voltage
o 9 Logic-Selectable Threshold Options
o Manual Reset and Tolerance Select (5%/10%) Inputs
o Small, 4mm x 4mm TQFN Package
o Fully Specified from -40°C to +125°C
Ordering Information
PART*
TEMP RANGE PIN-
PKG
PACKAGE CODE
MAX16041TE+ -40°C to +125°C 16 TQFN T1644-4
MAX16042TP+ -40°C to +125°C 20 TQFN T2044-3
MAX16043TG+ -40°C to +125°C 24 TQFN T2444-4
+Denotes lead-free package.
*For tape and reel, add a “T” after the “+.” All tape and reel
orders are available in 2.5k increments.
Pin Configurations
TOP VIEW
18 17 16 15 14 13
MR 19
12 TH1
CRESET 20
11 EN4
CDLY4 21
CDLY3 22
MAX16043
10 EN3
9 EN2
CDLY2 23
8 EN1
CDLY1 24
7 GND
+1 2 3 4 5 6
TQFN
(4mm x 4mm)
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Dual-/Triple-/Quad-Voltage, Capacitor-
Adjustable, Sequencing/Supervisory Circuits
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
RESET OUTPUT HIGH VOLTAGE
vs. SOURCE CURRENT
3.5
3.0
2.5
www.DataSh2.0eet4U.com
1.5
1.0
0.5
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
SOURCE CURRENT (mA)
ENABLE TURN-OFF
MAX16041 toc11
CRESET = VCC
CDLY_ = OPEN
EN_
5V/div
4µs/div
OUT_
5V/div
RESET
5V/div
ENABLE TURN-ON
MAX16041 toc12
CRESET = VCC
CDLY_ = OPEN
EN_
5V/div
40ms/div
OUT_
5V/div
RESET
5V/div
RESET TIMEOUT DELAY
MAX16041 toc13
CRESET = VCC
CDLY_ = OPEN
IN_
5V/div
100ms/div
OUT_
5V/div
RESET
5V/div
MR FALLING vs. RESET
MAX16041 toc14
CRESET = VCC
CDLY_ = OPEN
MR
5V/div
RESET
5V/div
4µs/div
MR RISING vs. RESET
MAX16041 toc15
CRESET = VCC
CDLY_ = OPEN
MR
5V/div
RESET
5V/div
40ms/div
MAXIMUM TRANSIENT DURATION
vs. THRESHOLD OVERDRIVE
100
90 OUTPUT ASSERTED ABOVE THIS LINE
80
70
60
50
40
30
20
10
0
1 10 100 1000
THRESHOLD OVERDRIVE (mV)
_______________________________________________________________________________________ 5
5 Page 
Dual-/Triple-/Quad-Voltage, Capacitor-
Adjustable, Sequencing/Supervisory Circuits
Adjustable Reset Timeout Period
(CRESET)
All of these parts offer an internally fixed reset timeout
(140ms min) by connecting CRESET to VCC. The reset
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.
Calculate the reset timeout period as follows:
www.DataSheet4U.com
tRP
=
VTH−RESET
ICH−RESET
× CCRESET
+ 30 × 10−6
where VTH-RESET is 0.5V, ICH-RESET is 0.5µA, tRP is in
seconds, and CCRESET is in Farads. To ensure timing
accuracy and proper operation, minimize leakage at
CCRESET.
Adjustable Delay (CDLY_)
When VIN rises above VTH with EN_ high, the internal
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 (tDELAY) from when VIN rises above
VTH (with EN_ high) to OUT_ going high according to
the equation:
tDELAY
=
VTH−CDLY
ICH−CDLY
× CCDLY
+ 35 × 10−6
where VTH-CDLY is 1V, ICH-CDLY is 0.25µA, CCDLY is in
Farads, and tDELAY is in seconds. To ensure timing
accuracy and proper operation, minimize leakage
at CDLY.
Manual-Reset Input (MR)
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
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.
Pullup Resistor Values
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
VCC = 2.25V and the pullup voltage is 28V, keep the
sink current less than 0.5mA as shown in the Electrical
Characteristics. 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 VCC supply voltage.
Power-Supply Bypassing
The device operates with a VCC supply voltage from
2.2V to 28V. When VCC falls below the UVLO threshold,
all the outputs go low and stay low until VCC falls below
1.2V. For noisy systems or fast rising transients on VCC,
connect a 0.1µF ceramic capacitor from VCC to GND
as close to the device as possible to provide better
noise and transient immunity.
Ensuring Valid Reset Output
with VCC Down to 0V
When VCC falls below 1.2V, the ability for the output to
sink current decreases. To ensure a valid output as
VCC falls to 0V, connect a 100kΩ resistor from RESET
to GND.
Typical Application Circuits
Figures 4 and 5 show typical applications for the
MAX16041/MAX16042/MAX16043. In high-power appli-
cations, using an n-channel device reduces the loss
across the MOSFETs as it offers a lower drain-to-source
on-resistance. However, an n-channel MOSFET
requires a sufficient VGS voltage to fully enhance it for a
low RDS_ON. The application in Figure 4 shows the
MAX16042 configured in a multiple-output sequencing
application. Figure 5 shows the MAX16043 in a power-
supply sequencing application using n-channel
MOSFETs.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX16041.PDF ] | |
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