User's Guide
SLVU456B–May 2011–Revised May 2013
TPS22924EVM-532
This user's guide describes the characteristics, operation, and use of the TPS22924EVM-532 evaluation
module (EVM). This EVM demonstrates the Texas Instruments TPS22924 load switch with controlled turn
on. The input voltage range of the TPS22924 is 0.75 V to 3.6 V. An integrated charge pump biases the
NMOS switch to achieve a minimum switch ON resistance. The switch is controlled by an on/off input
(EN), which is capable of interfacing directly with low-voltage control signals. This user's guide includes
setup instructions, schematic diagram, bill of materials, and printed-circuit board layout drawings for the
EVM.
1 Introduction
The TPS22924EVM-532 evaluation module (EVM) helps designers evaluate the operation and
performance of the TPS22924 load switch. The board features the small 6-pin CSP package for a small
solution size.
Table 1. TPS22924 VOUT Rise Time Options
EVM Device Rise Time VIN (V) Max. Enable (ON Quick
(µs) Typical Continuous Pin) Output
Current Discharge
HPA532-001 TPS22924B 100 3.6 2-A Active High Yes
HPA532-002 TPS22924C 840 3.6 2-A Active High Yes
HPA532-003 TPS22924D 6200 3.6 2-A Active High Yes
1.1 Related Documentation From Texas Instruments
TPS22924, ULTRA-SMALL, LOW-INPUT-VOLTAGE, LOW rON LOAD SWITCH data sheets (SLVSA52,
SLVSAR3,SLVSBT4)
2 Setup
This section describes the jumpers and connectors on the EVM as well as how to properly connect, set
up, and use the TPS22924EVM-532.
2.1 J1/J3 – Input Connections
This is the connection for the leads from the input source. Connect the positive connection to the VIN J1
and the negative connection to the GND J3.
2.2 J4/J6 – Output Connections
This is the connection for the output of the TPS22924EVM. Connect the positive connection of the load to
the VOUT J4 and the negative connection to the GND J6.
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Operation
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2.3 JP3 – EN
This is the enable input for the device. Place a shorting jumper across the HI and EN pins of JP3 to
enable the integrated circuit (IC). Place a shorting jumper across the LO and EN pins of JP3 to disable the
IC. A shorting jumper must be installed on JP3 in either the ON or OFF positions, and EN must not be left
unconnected. An external enable source can be applied to the TPS22924 by removing the shunt and
connecting a signal to the center pin of JP3. EN ≥0.75V is required for the ACTIVE or ON state of the
device. A switching signal may also be used and connected at this point.
2.4 J2/J5 – VIN Sense and VOUT Sense
These two connectors are used when very accurate measurements of input or output voltage are required,
Ron measurements should be made using these sense connections and measuring the voltage drop from
VIN to VOUT and then calculating the resistance.
3 Operation
Connect the positive input of the power supply to the VIN J1 and the negative lead of the power supply to
GND J3. The input voltage range of the TPS22924 is 0.75 V to 3.6 V.
Output load can be applied by connecting between J4 VOUT and J6 GND. The TPS22924 is rated for a
maximum continuous current of 2A. Additional output load can be selected using JP6, JP7, and JP8.
Shorting across JP6 selects R1 an 36 ohm on board resistor. JP7 selects R2 an 11 ohm on board resistor.
JP8 selects R3 which is open for customer selection. R1, 2 and 3 are intended for light loads of the
output, observe the 1/8W power rating for these parts. Configure jumper JP3 as required. JP3 must be
installed for proper operation. ON is normal operation. While operating in the ON state the rise time of the
device is internally controlled to avoid inrush current. Different rise times are selected by device types as
shown above in Table 1. In the OFF position, the device is shut down and a 1250-Ωon-chip load resistor
is added for output quick discharge.
4 Test Results
See the Typical Characteristics section of the TPS22924 data sheet.
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Test Configurations
5 Test Configurations
5.1 On State Resistance (rON) Test Setup
Figure 1 shows a typical setup for measuring On State Resistance. The voltage drop across the switch is
measured using the sense connections then divided by the current into the load yielding the rON resistance
Figure 1. rON Setup
5.2 Slew Rate Test Setup
Figure 2 shows a test setup for measuring the Slew Rate of the Load Switch. Controlling the ON pin of the
switch with a signal source and then measuring the output with a scope shows the switches ability to
avoid inrush current.
Figure 2. Slew Rate Setup
6 Board Layout, Schematic, and Bill of Materials
This section provides the TPS22924EVM-532 board layout, schematic, and bill of materials.
6.1 Board Layout
For best performance, all traces should be as short as possible. To be most effective, the input and output
capacitors should be placed close to the device to minimize the effects that parasitic trace inductances
may have on normal and short-circuit operation. Using wide traces for VIN, VOUT, and GND helps minimize
the parasitic electrical effects along with minimizing the case to ambient thermal impedance Figure 3 and
Figure 4 show the board layout for the TPS22924EVM-532 PCB.
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Board Layout, Schematic, and Bill of Materials
6.2 Schematic and Bill of Materials
Figure 5. TPS22924EVM-532 Schematic
Table 2. Bill of Materials(1)(2)(3)(4)
-001 -002 -003 RefDes Value Description SIZE Part MFR
COUNT COUNT COUNT Number
1 1 1 -- PCB, 0.9 In x 1.7 In x 0.062 In HPA532 Any
1 1 1 C3 0.1uF Capacitor, Ceramic, 50-V, Y5V 603 GRM188F MuRata
51H104ZA
01D
1 1 1 C2 1uF Capacitor, Ceramic, 25-V, Y5V 603 GRM188F MuRata
51E105A1
2D
0 0 0 C1, C4 OPEN Capacitor, Ceramic 603 Std Std
1 1 1 R1 36 Resistor, 5% 1/8W 805 ERJ- Panasonic
6GEYJ36
0V
1 1 1 R2 11 Resistor, 5% 1/8W 805 ERJ- Panasonic
6GEYJ11
0V
0 0 0 R3 OPEN Resistor, 5% 1/8W 805 Std Std
13 13 13 J1-J6,JP1- PEC02SA Header,2pin, 100mil spacing 0.100 inch PEC02SA Sullins
2,JP4-8 AN x 2 AN
1 1 1 JP3 PEC03SA Header,3pin, 100mil spacing 0.100 inch PEC03SA Sullins
AN x 3 AN
1 0 0 U1 TPS22924 IC, Single Chip, Low Input Voltage Current-Limited Load YZ TPS22924 TI
BYZ Switch with Shut Off Auto-Restart BYZ
0 1 0 U1 TPS22924 IC, Single Chip, Low Input Voltage Current-Limited Load YZP TPS22924 TI
CYZP Switch with Shut Off Auto-Restart CYZP
0 0 1 U1 TPS22924 IC, Single Chip, Low Input Voltage Current-Limited Load YZP TPS22924 TI
DYZP Switch with Shut Off Auto-Restart DYZP
1 1 1 Label (See note 5) 1.25 x THT-13- Brady
0.25 inch 457-10
3 3 3 NA NA Shunt, 100-mil, Black 0.100 929950-00 3M
(1) These assemblies are ESD sensitive, ESD precautions shall be observed.
(2) These assemblies must be clean and free from flux and all contaminants. Use of no clean flux is not acceptable.
(3) These assemblies must comply with workmanship standards IPC-A-610 Class 2.
(4) Ref designators marked with an asterisk (**) cannot be substituted. All other components can be substituted with equivalent components.
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Board Layout, Schematic, and Bill of Materials
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Table 3. Table 3. (continued)
Table 3 Table 3
Assembly number Text HPA532-002 TPS22924CEVM-532
HPA532-001 TPS22924BEVM-532 HPA532-003 TPS22924DEVM-532
5.3 VOUT Rise Time and TON Response
Figure 6. TPS22924B TON and Trise Example
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EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of 0.75 V to 3.6 V and the output voltage range of .
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions
concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.
Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than 50°C. The EVM is designed to operate
properly with certain components above 60°C as long as the input and output ranges are maintained. These components include but are
not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified
using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.
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