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PDF MAX16126 Data sheet ( Hoja de datos )
| Número de pieza | MAX16126 | |
| Descripción | (MAX16126 / MAX16127) Load-Dump/Reverse-Voltage Protection Circuits | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-6053; Rev 0; 11/11
MAX16126/MAX16127
Load-Dump/Reverse-Voltage Protection Circuits
General Description
The MAX16126/MAX16127 load-dump/reverse-voltage
protection circuits protect power supplies from dam-
aging input voltage conditions, including overvoltage,
reverse-voltage, and high-voltage transient pulses. Using
a built-in charge pump, the devices control two exter-
nal back-to-back n-channel MOSFETs that turn off and
isolate downstream power supplies during damaging
input conditions, such as an automotive load-dump pulse
or a reverse-battery condition. Operation is guaranteed
down to 3V to ensure proper operation during automo-
tive cold-crank conditions. These devices feature a flag
output (FLAG) that asserts during fault conditions.
For reverse-voltage protection, external back-to-back
MOSFETs outperform the traditional reverse-battery
diode, minimizing the voltage drop and power dissipa-
tion during normal operation.
The MAX16126/MAX16127 use external resistors to
adjust the overvoltage and undervoltage comparator
thresholds for maximum flexibility.
The MAX16127 provides limiter-mode fault manage-
ment for overvoltage and thermal shutdown conditions;
whereas the MAX16126 provides switch-mode fault
management for overvoltage and thermal shutdown con-
ditions. In the limiter mode, the output voltage is limited
and FLAG is asserted low during a fault. In the switch
mode, the external MOSFETs are switched off and FLAG
is asserted low after a fault. The switch mode is available
in four options: latch mode, 1 autoretry mode, 3 autoretry
mode, and always autoretry mode.
The MAX16126/MAX16127 are available in 12-pin TQFN
packages. These devices operate over the automotive
temperature range (-40NC to +125NC).
Applications
Automotive
Industrial
Avionics
Telecom/Server/Networking
Benefits and Features
S Operates Down to +3V, Riding Out Cold-Crank
Conditions
S -30V to +90V Wide Input Voltage Protection Range
S Minimal Operating Voltage Drop Reverse-Voltage
Protection
S Fast Gate Shutoff During Fault Conditions with
Complete Load Isolation
S Adjustable Undervoltage/Overvoltage Thresholds
S Thermal Shutdown Protection
S Low Supply Current and Low Shutdown Current
S Charge-Pump Circuit Enhances External
n-Channel MOSFETs
S FLAG Output Identifies Fault Condition
S Automotive Qualified
S -40NC to +125NC Operating Temperature Range
S Available in 3mm x 3mm, 12-Pin TQFN Package
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX16126.related.
����������������������������������������������������������������� Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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1 page  
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MAX16126/MAX16127
Load-Dump/Reverse-Voltage Protection Circuits
Typical Operating Characteristics (continued)
(VIN = 12V, TA = +25NC, unless otherwise noted.)
OVSET THRESHOLD vs. TEMPERATURE
1.5
RISING
1.3
UVSET THRESHOLD vs. TEMPERATURE
1.5
RISING
1.3
FLAG OUTPUT LOW VOLTAGE
vs. CURRENT
0.5
0.4
1.1
FALLING
0.9
1.1
FALLING
0.9
0.3
0.2
0.7 0.7 0.1
0.5
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0.5
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0
0 0.5 1.0 1.5
FLAG CURRENT (mA)
OVERVOLTAGE FAULT TO GATE
PROPAGATION DELAY vs. TEMPERATURE
1.00
VOVSET PULSED FROM
(VTH - 100mV) TO (VTH + 100mV)
0.75
REVERSE CURRENT
vs. REVERSE VOLTAGE
30
25
20
2.0
0.50 15
10
0.25
5
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0
0 5 10 15 20 25 30
REVERSE VOLTAGE (V)
����������������������������������������������������������������� Maxim Integrated Products 5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
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MAX16126/MAX16127
Load-Dump/Reverse-Voltage Protection Circuits
Table 1. Summary of ISO7637 Pulses
NAME
DESCRIPTION
Pulse 1
Pulse 2a
Pulse 3a
Pulse 3b
Inductive load disconnection
Inductive wiring disconnection
Switching transients
Pulse 4
Cold crank
Pulse 5a
Pulse 5b
Load dump (unsuppressed)
Load dump (suppressed)
*Relative to system voltage.
PEAK VOLTAGE (V) (max)*
12V SYSTEM
-100
50
-150
100
-7
-6
87
(Varies, but less than pulse 5a)
DURATION
1ms to 2ms
0.05ms
0.2Fs
100ms (initial)
Up to 20s
400ms (single)
Refer to the ISO7637-2 specification for details on pulse
waveforms, test conditions, and test fixtures.
Setting Overvoltage and Undervoltage
Thresholds (MAX16126)
The MAX16126 uses an external resistive divider to
set the overvoltage and undervoltage thresholds. The
MAX16126 operates in switch mode in which the internal
overvoltage comparator monitors the input voltage. It
uses three resistors in a single resistive divider to set the
undervoltage and overvoltage thresholds. The top of the
resistive divider connects to TERM (see Figure 1).
The MAX16126 includes internal undervoltage and over-
voltage comparators for window detection. GATE is
enhanced and the n-channel MOSFETs are on when
the IN voltage is within the selected window. When the
monitored voltage falls below the lower limit (VTRIPLOW)
or exceeds the upper limit (VTRIPHIGH) of the window,
the GATE voltage goes to GND, turning off the MOSFETs.
The circuit in Figure 1 shows the MAX16126 enabling the
DC-DC converter when the monitored voltage is in the
selected window.
The resistor values R1, R2, and R3 can be calculated as
follows:
VTRIPLOW
=
(VTH
-
VTH-HYS)
R TOTAL
R2 + R3
VTRIPHIGH
=
VTH
R
TOTAL
R3
where RTOTAL = R1 + R2 + R3, VTH is the 1.225V OVSET/
UVSET threshold, VTH-HYS is the hysteresis.
Use the following steps to determine the values for R1,
R2, and R3:
1) Choose a value for RTOTAL, the sum of R1, R2, and R3.
2) Calculate R3 based on RTOTAL and the desired upper
trip point:
R3
=
VTH × R TOTAL
VTRIPHIGH
3) Calculate R2 based on RTOTAL, R3, and the desired
lower trip point:
R2
=
(VTH
-
VTH-HYS) × RTOTAL
VTRIPLOW
- R3
4) Calculate R1 based on RTOTAL, R2, and R3:
R1 = R TOTAL - R2 - R3
���������������������������������������������������������������� Maxim Integrated Products 11
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11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX16126.PDF ] | |
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