MAX16126/MAX16127
Evaluation Kits
Evaluate: MAX16126/MAX16127
Component List
General Description
The MAX16126/MAX16127 evaluation kits (EV kits) dem-
onstrate high overvoltage protection of the MAX16126/
MAX16127 devices for automotive applications that must
survive load-dump and high-voltage transient conditions.
The fully assembled and tested surface-mount EV kit
board provides two circuits: One full-featured solution
and one minimum parts-count circuit. The full-featured
solution exercises all the features of the devices and
allows -60V to +90V protection beyond the 3V to 30V
operating range. The minimum parts-count solution pro-
vides a cost-effective option using a small 3A, dual
MOSFET and reduced 0 to +60V voltage range.
Features
● Dual Circuits
• Full-Featured Solution (-60V to +90V)
• Minimum Parts-Count Solution (0 to +60V)
● Robust Reverse-Battery Protection (Circuit 1)
● Positive Input Supply Voltage Protection Range
Extended Beyond +90V (Circuit 1)
● Adjustable Undervoltage and Overvoltage Thresholds
● Adjustable Undervoltage Set for 8V
● Adjustable Overvoltage Threshold Set for 32.1V
● Enable Input/Flag Output
● Proven PCB Layout
● Fully Assembled and Tested
19-6432; Rev 1; 7/16
Ordering Information appears at end of data sheet.
DESIGNATION QTY DESCRIPTION
C1, C8 2
0.1µF ±10%, 250V X7R ceramic
capacitors (1206)
Murata GRM31CR72E104K
TDK C3216X7R2E104K
C3, C9 0 Not installed, ceramic capacitors
(0805)
C4, C10 2
330µF, 35V electrolytic capacitors
(10mm x 10.2mm x 12mm)
Panasonic EEE-FK1V331GP
C6, C12 2
0.22µF ±10%, 100V X7R ceramic
capacitors (0805)
Murata GRM21AR72A224KAC5#
COM, IN, OUT,
SYSGND (x2) 5
20G tinned copper bus wire from/
into “U” shaped loops
(0.25in off the PCB)
D1 1 75V zener diode (SMA)
Central Semi CMZ5946B
D2, D8 2 5.1V zener Diodes (SOD-123)
D3, D6 2
15V zener diodes (SOT23)
Central Semi CMPZ5245B
Diodes Inc. MMBZ5245B-7-F
D4, D7 2 Green LEDs (1206)
DESIGNATION QTY DESCRIPTION
D5 1
100V, 250mA Schottky diode
(SOD323)
NXP BAT46WJ,115
FLAG, FLAG1,
RUN, RUN1 4 Test points (5000)
IN, OUT,
SYSGND (x2) 4 Banana jacks
JU1–JU4 4 2-pin headers, 0.1in centers
Q1, Q2 2
100V, 50A nMOSFETs (DPAK)
Fairchild FDD86110
IR IRFR4510PbF
Q3 1
Dual nMOSFET
(PowerPAK, 8 SO)
Vishay Si7964DP
R1, R20 2 57.6kΩ ±1% resistors (0603)
R2, R4,
R21, R23 410kΩ ±1% resistors (0603)
R3A, R15A 2 See the EV Kit-Specic
Component List
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Component List (continued)
EV Kit-Specic Component List
*EP = Exposed pad.
Component Suppliers
Note: Indicate that you are using the MAX16126 and/or MAX16127 when contacting these component suppliers.
DESIGNATION QTY DESCRIPTION
R3B, R15B 2 See the EV Kit-Specic
Component List
R5 1 100Ω ±5% resistor (1210)
CRCW1210100RNEAHP
R6, R7,
R25, R26 4100kΩ ±5% resistors (0603)
R8, R17 2 2.2kΩ ±1% resistors (0603)
R9, R16 2 56Ω ±5% resistors (0603)
DESIGNATION QTY DESCRIPTION
R10 1 10Ω ±5% resistor (1210)
R11, R14, R19 0 Not installed, resistors (0603)
R12, R13, R24 3 1kΩ ±5% resistors (0603)
U1, U2 2 See the EV Kit-Specic
Component List
— 4 Shunts
— 1 PCB: MAX16126/7 EVALUATION
KIT
EV KIT DESIGNATION QTY DESCRIPTION
MAX16126EVKIT#
R3A, R15A 0 Not installed, resistors (0603)
R3B, R15B 2 249kΩ ±1% resistors (0603)
U1, U2 2 Load-dump/reverse-voltage protection circuit (12 TQFN-EP*)
Maxim MAX16126TCA+
MAX16127EVKIT#
R3A, R15A 2 249kΩ ±1% resistors (0603)
R3B, R15B 0 Not installed, resistors (0603)
U1, U2 2 Load-dump/reverse-voltage protection circuit (12 TQFN-EP*)
Maxim MAX16127TC+
SUPPLIER WEBSITE
Central Semiconductor Corp. www.centralsemi.com
Diodes Incorporated www.diodes.com
Fairchild Semiconductor www.fairchildsemi.com
International Rectier www.irf.com
Murata Electronics North America, Inc. www.murata.com
NXP Semiconductors www.nxp.com
Panasonic Corp. www.panasonic.com
TDK Corp. www.component.tdk.com
Vishay www.vishay.com
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MAX16126/MAX16127
Evaluation Kits
Evaluate: MAX16126/MAX16127
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Quick Start
Recommended Equipment
● MAX16126/MAX16127 EV kit
● ±25V, 50W DC power supply
● Electronic load
● Oscilloscope
● Digital voltmeter
Procedure (Full-Featured Solution: Circuit 1)
The EV kit is fully assembled and tested. Follow the steps
below to verify operation. Caution: Do not turn on the
power supply until all connections are completed.
1) Connect a DC power supply (0 to +35V) across the IN
and SYSGND PCB pads.
2) Connect a voltmeter or oscilloscope and a load (if
desired) between the OUT and SYSGND PCB pads.
3) Verify that a shunt is installed across jumper JU1,
connecting SHDN to IN.
4) Turn on the power supply and increase the input
voltage. The output turns on when the input voltage
exceeds +8V, the undervoltage set point. Increase the
input voltage; for the MAX16126, the output turns off
when the input voltage exceeds +32.1V, the overvolt-
age set point. For the MAX16127, the output stays lim-
ited at +32V at the overvoltage condition. Refer to the
MAX16126/MAX16127 IC data sheet for more details.
Detailed Description of Hardware
The MAX16126/MAX16127 EV kits demonstrate a high
overvoltage protection circuit for automotive applications
that must survive load-dump and high-voltage transient
conditions. Additional zener diodes at the input of the
ICs provide extended positive voltage-range protection
against higher voltage transients. The EV kits provide two
separate circuits for evaluation: A full-featured solution
and a minimum parts-count solution. The full-featured
solution provides a robust -60V to +90V protection range.
The minimum parts-count solution supports a protection
range of 0 to +60V.
The dual MOSFET (circuit #2) supplies 3A, while the
MOSFETs of the full-featured circuit (circuit #1) will
supply 5A when the input voltage remains between the
input UVP and OVP limits.
Overvoltage Protection
The devices feature overvoltage protection that monitors
either the input (MAX16126) or the output (MAX16127)
for overvoltage conditions through a resistive divider.
The MAX16126 features switch-mode fault management
for overvoltage conditions, while the MAX16127 features
voltage limiter-mode fault management for overvoltage
conditions.
Switch-Mode Fault Protection (MAX16126)
The MAX16126 features a switch-mode fault protection
that monitors the input voltage and turns off the back-to-
back MOSFETs by pulling the GATE to ground when an
overvoltage or undervoltage condition occurs. Depending
on the device configuration, during an overvoltage condi-
tion, the MAX16126 either latches off or enters an autore-
try mode during the overvoltage condition. Refer to the
MAX16126/MAX16127 IC data sheet for more details.
For the latchoff version, the latch is cleared by cycling the
input voltage (IN) below the undervoltage-lockout thresh-
old or by toggling SHDN. Use the following formula to set
a different overvoltage threshold for the MAX16126:
( )
OVTH
TH
V R4
R3B R4 700
V

×
= −+Ω


where R4 is 10kΩ (typ), VTH is +1.225V for the OVSET
threshold, VOVTH is the desired overvoltage threshold,
and 700Ω is the typical on-resistance of the TERM switch.
This equation applies to the full-featured solution circuit
(circuit 1). For the minimum parts-count solution (bottom
portion), replace R3B = R15B and R4 = R23.
Voltage Limiter-Mode Fault
Protection (MAX16127)
The MAX16127 features a limiter-mode fault protection
that monitors the output voltage for an overvoltage condi-
tion using a resistive divider between OUT and OVSET.
During the overvoltage condition, the output is regulated at
the overvoltage-threshold voltage and continues to supply
power to downstream devices. If the overvoltage condition
lasts long enough to heat the MOSFETs, the MAX16127
could reach thermal limit and pull the GATE low until the
device cools by 20°C. Use the following formula to set a
different overvoltage threshold for the MAX16127:
( )
OVTH
TH
V R4
R3A R4 ,
V

×
= −


where R4 is 10kΩ (typ), VTH is +1.225V for the OVSET
threshold, and VOVTH is the desired overvoltage thresh-
old. This equation applies to the full-featured solution
circuit (top portion). For the minimum parts-count solution
(circuit 2), replace R3A = R15A and R4 = R23.
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Undervoltage Protection
The devices monitor the input voltage for undervoltage
conditions using a resistive divider between TERM and
UVSET (TERM connects to IN through an internal switch
when VSHDN goes high). When the input voltage drops
below the programmed threshold, the GATE voltage goes
low and the MOSFETs turn off. When the input voltage
exceeds the undervoltage threshold, the GATE voltage
goes high turning on the MOSFETs. Use the following
formula to set a different undervoltage threshold:
( )
UVTH
TH
V R2
R1 R2 700 ,
V

×
= −+Ω


where R2 is 10kΩ (typ), VTH is +1.225V for the UVSET
threshold, and 700Ω is the typical on-resistance of the
TERM switch. This equation applies to the full-featured
solution circuit (circuit 1). For the minimum parts-count
solution (circuit 2), replace R1 = R20 and R2 = R20.
Extended Input-Voltage
Protection Range (Circuit 1)
The full-featured solution tolerates -60V to +90V
transients. To increase the positive input-voltage pro-
tection range beyond the positive absolute maximum
ratings, the EV kit includes a zener diode (D1) between the
input supply (IN) of the device and COM. To increase the
negative input-voltage protection range, a diode between
COM (ground of the protection device) and SYSGND
(ground carrying load current), D5 must be installed. A series
surface-mount resistor (R5) from IN to the supply input of
the EV kit limits the current drawn by the zener diodes.
The size of the series resistor is critical to the proper oper-
ation of the device. Higher resistor values support high
overvoltage transients, but interfere with the undervoltage-
threshold set point. However, lower resistor values contrib-
ute to the power loss through the zener diodes.
Load Dump
Load dump is a common event in automotive systems
and occurs when the alternator charging the battery
suddenly disconnects from the battery terminals, caus-
ing the alternator voltage to spike due to the large
capacitance of the battery removed. As the battery is
disconnected, the alternator voltage jumps very high and
the devices protect the sensitive circuit blocks during this
event.
Shutdown Input (SHDN)
The devices feature a shutdown input. For normal opera-
tion, a shunt should be installed across jumpers JU1 and
JU3. To disable the output, remove the shunts on JU1 and
JU3 and an internal 1µA shutdown current pulls SHDN
low or drives the RUN/RUN1 test points low. See Table 1
for JU1 and JU3 jumper settings.
Optional RC Load at GATE for Inrush Control
The EV kits feature an optional RC (R13/C6 and R24/
C12) at the GATE pin of the device that is connected
through jumpers JU2 and JU4. If necessary to slow down
the turn-on time of the GATE of the MOSFET(s), install a
shunt across JU2 and JU4. By default, JU2 and JU4 are
not connected.
Table 1. Shutdown Input (SHDN Jumper
JU1, JU3 Settings
*Default position.
SHUNT
POSITION SHDN PIN DEVICES
Installed* Connected to IN Enabled
Not installed
Internally pulled low through
1µA shutdown current or the
RUN/RUN1 test point can be
driven low.
Disabled
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Evaluation Kits
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Figure 1a. MAX16126/MAX16127 EV Kit Schematic (Sheet 1 of 2)—Circuit 1
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Figure 1b. MAX16126/MAX16127 EV Kit Schematic (Sheet 2 of 2)—Circuit 2
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Evaluation Kits
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Figure 2. MAX16126/MAX16127 EV Kit Component Placement
Guide—Component Side
Figure 3. MAX16126/MAX16127 EV Kit PCB Layout—
Component Side
1.0’’ 1.0’’
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Evaluation Kits
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Figure 4. MAX16126/MAX16127 EV Kit PCB Layout—Solder
Side
1.0’’
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Evaluation Kits
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#Denotes RoHS compliant.
Ordering Information
PART TYPE
MAX16126EVKIT# EV Kit
MAX16127EVKIT# EV Kit
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time.
MAX16126/MAX16127
Evaluation Kits
Evaluate: MAX16126/MAX16127
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Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 4/13 Initial release —
1 8/16 Updated BOM and schematic 1, 2, 5, 6
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.