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User’s Guide
LM74501-Q1EVM User's Guide
ABSTRACT
This user’s guide describes the evaluation module (EVM) for TI's reverse polarity protection controller,
LM74501-Q1. This document provides configuration information and test setup details for evaluating
LM74501-Q1 devices. An EVM schematic, board layout images, and bill of materials (BOM) are included.
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Setup........................................................................................................................................................................................2
2.1 I/O Connector Description..................................................................................................................................................2
2.2 Board Setup....................................................................................................................................................................... 3
2.3 Schematic.......................................................................................................................................................................... 4
3 Operation.................................................................................................................................................................................5
3.1 LM74501-Q1EVM Performance Capture........................................................................................................................... 5
4 EVM Board Assembly Drawings and Layout Guidelines....................................................................................................7
4.1 PCB Drawings....................................................................................................................................................................7
4.2 Bill of Materials...................................................................................................................................................................9
5 Revision History....................................................................................................................................................................11
List of Figures
Figure 2-1. LM74501-Q1EVM Typical Application Circuit............................................................................................................2
Figure 2-2. LM74501-Q1EVM......................................................................................................................................................3
Figure 2-3. LM74501-Q1EVM Schematic....................................................................................................................................4
Figure 3-1. LM74501-Q1EVM Startup......................................................................................................................................... 5
Figure 3-2. Startup Reverse Polarity (–12 V)...............................................................................................................................6
Figure 4-1. LM74501-Q1EVM Top Side Placement.....................................................................................................................7
Figure 4-2. LM74501-Q1EVM Bottom Side Placement............................................................................................................... 7
Figure 4-3. LM74501-Q1EVM Top Layer Routing....................................................................................................................... 8
Figure 4-4. LM74501-Q1EVM Bottom Layer Routing..................................................................................................................8
List of Tables
Table 4-1. Bill of Materials............................................................................................................................................................9
Trademarks
All trademarks are the property of their respective owners.
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LM74501-Q1EVM User's Guide
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Introduction
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1 Introduction
The LM74501-Q1 evaluation module (LM74501-Q1EVM) helps designers evaluate the operation and
performance of the LM74501-Q1 reverse polarity protection controller. This evaluation module demonstrates
how an N-channel power MOSFET can emulate a very-low forward voltage diode with low IQ and low-leakage
current flowing through the IC. In this design scheme, the LM74501-Q1 is combined with a MOSFET and used
in series with a battery as a replacement for a Schottky diode and PFET, in reverse-polarity protection circuitry
as shown in Figure 2-1. For more information on the LM74501-Q1 functional and electrical characteristics, see
LM74501-Q1 "TVS Less" Reverse Battery Protection Controller data sheet.
2 Setup
This section describes the jumpers and connectors on the EVM, and how to properly connect, setup, and use
the LM74501-Q1EVM. Ensure the power supply is turned off while making connections on the board.
2.1 I/O Connector Description
VIN
J1: Power input connector to the positive rail of the input power supply
GND1
J3: Ground connection for the power supply
VOUT
J2: Power output connector to the positive side of the load
GND2
J4: Ground connection for the load
EN
J5: Jumper to enable LM74501Q1 gate driver
1-2 position connects EN to Source, 2-3 position connects EN to GND
Test Points
VINA, VOUTA,GATE,ENA,BATT_MON, GND1, and GND2 are test points
High Side Switch
VBAT
VOUT
To
Load
CT
CIN
COUT
SOURCE
GATE
DRAIN
VCAP
SW
LM74501-Q1
EN
R1
ON OFF
BATT_MON
GND
R2
Figure 2-1. LM74501-Q1EVM Typical Application Circuit
2
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Setup
2.2 Board Setup
•
•
•
•
•
Before applying power to the LM74501-Q1EVM, verify all external connections.
Turn off external power supplies and connect them with the proper polarity to the VIN and GND1 connectors.
An electronic or resistive load must be connected at the output VOUT and GND2 connectors.
The tests outlined in this document are conducted with 3-A constant current as the load and 12 V at the input.
Make sure that the external power-supply source for the input voltage is capable of providing enough current
to the output load so that the output voltage can be obtained.
When all connections to the LM74501-Q1EVM are verified, apply power to VIN. Figure 2-2 captures EVM board
setup.
Figure 2-2. LM74501-Q1EVM
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Setup
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2.3 Schematic
Figure 2-3 illustrates the EVM schematic.
Q2
3
4
DNP
1
SQD100N04-3M6_GE3
VINA
VOUTA
3
2
1
J1
Q1
J2
5
BananaJack
4
BananaJack
BUK7Y3R0-40HX
CT
22nF
100V
C4
0.33µF
R3
0
GATE
5A max Current
J5
C1
220nF
25V
PEC03SAAN
2
3
6
GND1
4
SOURCE
VCAP
EN
SW
GATE
DRAIN
NC
GND
1
2.2uF
1
ENA
47uF
7
GND2
5
LM74501QDDFQ1
BananaJack
C3
8
R1
91k
J3
D2
DNP
SMAJ58A
58V
1
C5
0.33µF
C2
U1
1
2
3
5A max Current
J4
BananaJack
BAT T_MON
R2
9.1k
SGND
SGND
SGND
SGND
Figure 2-3. LM74501-Q1EVM Schematic
4
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Operation
3 Operation
3.1 LM74501-Q1EVM Performance Capture
3.1.1 LM74501-Q1EVM Startup
•
•
•
A startup pulse from 0 V to 12 V is applied at the input of the LM74501-Q1EVM.
Figure 3-1 shows the input voltage (CH2) rises from 0 V to 12 V and the gate voltage (CH3) comes up after
input voltage crosses device PoR threshold.
The gate of external N-FET is fully enhanced and FET is turned on. Output voltage (CH1) rises smoothly from
0 V to 12 V.
Figure 3-1. LM74501-Q1EVM Startup
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Operation
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3.1.2 Startup Reverse Polarity (–12 V)
•
•
•
A –12-V source is connected to the VIN input of the LM74501-Q1EVM.
Figure 3-2 shows that the output voltage remains at a constant 0 V in this situation.
This test simulates the event of connecting a 12-V battery in the reverse direction; therefore, protecting the
load from negative input voltages.
Figure 3-2. Startup Reverse Polarity (–12 V)
6
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EVM Board Assembly Drawings and Layout Guidelines
4 EVM Board Assembly Drawings and Layout Guidelines
4.1 PCB Drawings
Figure 4-1 through Figure 4-4 show component placement and layout of this EVM.
Figure 4-1. LM74501-Q1EVM Top Side Placement
Figure 4-2. LM74501-Q1EVM Bottom Side Placement
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EVM Board Assembly Drawings and Layout Guidelines
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Figure 4-3. LM74501-Q1EVM Top Layer Routing
Figure 4-4. LM74501-Q1EVM Bottom Layer Routing
8
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EVM Board Assembly Drawings and Layout Guidelines
4.2 Bill of Materials
Table 4-1 lists the LM74501-Q1EVM BOM.
Table 4-1. Bill of Materials
Designator
Quantity
!PCB
1
Value
Description
Package Reference
Printed Circuit
Board
BATT_MON,
5
ENA, GATE,
VINA, VOUTA
Test Point,
Miniature,
SMT
Part Number
Manufacturer
PSIL135
Any
Testpoint_Keystone_Miniatu 5015
re
Keystone
C1
1
0.1uF
CAP, CERM,
0603
0.1 uF, 25 V,
+/- 10%, X7R,
AEC-Q200
Grade 1, 0603
CGA3E2X7R1E104K080A
A
C2
1
2.2uF
CAP, CERM,
2.2 uF, 100 V,
+/- 10%, X7R,
AEC-Q200
Grade 1,
CGA6N3X7R2A225K230A TDK
B
C3
1
47uF
CAP, AL, 47
D8xL10.2mm
uF, 63 V, +/20%, AECQ200 Grade 2,
SMD
EEE-HA1J470UP
Panasonic
C4, C5
2
0.33uF
CAP, CERM,
1206
0.33 µF, 50
V,+/- 10%,
X8R, AECQ200 Grade 0,
1206
CGA5L2X8R1H334K160A
A
TDK
CT
1
0.022uF
CAP, CERM,
0603
0.022 uF, 100
V, +/- 10%,
X7R, AECQ200 Grade 1,
0603
CGA3E2X7R2A223K080A
A
TDK
GND1, GND2
2
TEST POINT
SLOTTED .11
8", TH
H1, H2, H3,
H4
4
Machine
Screw
Screw, Round,
#4-40 x 1/4,
Nylon, Philips
panhead
NY PMS 440 0025 PH
B&F Fastener
Supply
H5, H6, H7,
H8
4
Standoff, Hex, Standoff
0.5"L #4-40
Nylon
1902C
Keystone
J1, J2, J3, J4
4
Standard
Banana Jack,
Uninsulated,
8.9mm
575-8
Keystone
Test point, TH Slot Test point 1040
Keystone575-8
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TDK
Keystone
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EVM Board Assembly Drawings and Layout Guidelines
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Table 4-1. Bill of Materials (continued)
Designator
Quantity
J5
LBL1
Value
Description
Package Reference
Part Number
Manufacturer
1
Header,
100mil, 3x1,
Tin, TH
Header, 3 PIN, 100mil, Tin
PEC03SAAN
Sullins
Connector
Solutions
1
Thermal
PCB Label 0.650 x 0.200
Transfer
inch
Printable
Labels, 0.650"
W x 0.200" H -
THT-14-423-10
Brady
N-Channel
SOT669
40V 120A (Ta)
172W (Ta)
Surface Mount
LFPAK56,
Power-SO8
BUK7Y3R0-40HX
Nexperia
10,000 per roll
Q1
1
R1
1
91k
RES, 91 k,
0603
5%, 0.1 W,
AEC-Q200
Grade 0, 0603
CRCW060391K0JNEA
Vishay-Dale
R2
1
9.1k
RES, 9.1 k,
0603
5%, 0.1 W,
AEC-Q200
Grade 0, 0603
CRCW06039K10JNEA
Vishay-Dale
R3
1
0
RES, 0, 5%,
0.1 W, 0603
ERJ-3GEY0R00V
Panasonic
SH-J1
1
1x2
Shunt, 100mil, Closed Top 100mil Shunt
Flash Gold,
Black
SPC02SYAN
Sullins
Connector
Solutions
U1
1
Low IQ
SOT23-8
Reverse
Battery
Protection
Controller with
Integrated
VDS Clamp
LM74501QDDFQ1
Texas
Instruments
D2
0
Diode, TVS,
Uni, 58 V,
SMA
SMAJ58A
Diodes Inc.
FID1, FID2,
FID3, FID4,
FID5, FID6
0
Fiducial mark. N/A
There is
nothing to buy
or mount.
N/A
N/A
Q2
0
N-Channel
TO-252
40V 100A (Tc)
136W (Tc)
Surface Mount
TO-252AA
SQD100N04-3M6_GE3
Vishay
10
58V
LM74501-Q1EVM User's Guide
0603
SMA
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Revision History
5 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision * (May 2021) to Revision A (September 2021)
Page
• Updated Figure 2-2 ............................................................................................................................................3
• Updated Figure 2-3 ............................................................................................................................................4
• Updated Figure 4-1 through Figure 4-4 ............................................................................................................. 7
• Updated Table 4-1 ............................................................................................................................................. 9
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