Texas Instruments LMZM23601 User manual

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User's Guide for the LMZM23601 and LMZM23600 Evaluation Boards
User's Guide
SNVU578A–October 2017–Revised March 2018
User's Guide for the LMZM23601 and LMZM23600
Evaluation Boards
The evaluation modules (EVM) for the LMZM23601 and LMZM23600 are designed as easy-to-use
platforms to help evaluate the features and performance of these DC/DC step-down power modules. This
guide provides an overview of the board settings and board layout along with connection diagrams and
several performance curves for each device in the family.
Contents
1 Description.................................................................................................................... 3
2 Getting Started............................................................................................................... 4
3 Schematic..................................................................................................................... 6
3.1 Adjustable Output Voltage Versions.............................................................................. 6
3.2 Fixed Output Voltage Versions.................................................................................... 7
4 Bill of Materials............................................................................................................... 8
4.1 Adjustable Output Voltage Versions.............................................................................. 8
4.2 Fixed Output Voltage Versions.................................................................................... 9
5 Performance Data.......................................................................................................... 10
5.1 VOUT = 15 V......................................................................................................... 10
5.2 VOUT = 12 V......................................................................................................... 11
5.3 VOUT = 5 V........................................................................................................... 12
5.4 VOUT = 3.3 V ........................................................................................................ 13
5.5 VOUT = 2.5 V ........................................................................................................ 14
6 PCB Layout ................................................................................................................. 15
6.1 Adjustable Output Voltage Versions............................................................................ 15
6.2 Fixed Output Voltage Versions.................................................................................. 19
List of Figures
1 EVM User Interface for the Adjustable Output Voltage Options....................................................... 4
2 EVM User Interface for the Fixed (5-V and 3.3-V) Output Voltage Options ......................................... 4
3 Jumper Configuration Details for Each Board ........................................................................... 5
4 Schematic for the Adjustable Output Voltage Versions of the Module ............................................... 6
5 Schematic for the Fixed Output Voltage Versions of the Module ..................................................... 7
6 Bill Of Materials for the Adjustable Output Voltage Versions of the Module......................................... 8
7 Bill Of Materials for the Fixed Output Voltage Versions of the Module............................................... 9
8 Efficiency for VOUT = 15 V.................................................................................................. 10
9 Load Transient Response for VOUT = 15 V 10% to 100% Load Step, FPWM ...................................... 10
10 Output Ripple for VOUT = 15 V, 20 MHz BW............................................................................. 10
11 Output Ripple for VOUT = 15 V, 250 MHz BW........................................................................... 10
12 Efficiency for VOUT = 12 V ................................................................................................. 11
13 Load Transient Response for VOUT = 12 V 10% to 100% Load Step, FPWM ...................................... 11
14 Output Ripple for VOUT = 12 V, 20 MHz BW............................................................................. 11
15 Output Ripple for VOUT = 12 V, 250 MHz BW........................................................................... 11
16 Efficiency for VOUT = 5 V .................................................................................................. 12
17 Load Transient Response for VOUT = 5 V 10% to 100% Load Step, FPWM........................................ 12

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18 Output Ripple for VOUT = 5 V, 20 MHz BW.............................................................................. 12
19 Output Ripple for VOUT = 5 V, 250 MHz BW............................................................................. 12
20 Efficiency for VOUT = 3.3 V ................................................................................................ 13
21 Load Transient Response for VOUT = 3.3 V 10% to 100% Load Step, FPWM ..................................... 13
22 Output Ripple for VOUT = 3.3 V, 20 MHz BW............................................................................ 13
23 Output Ripple for VOUT = 3.3 V, 250 MHz BW .......................................................................... 13
24 Efficiency for VOUT = 2.5 V................................................................................................. 14
25 Load Transient Response for VOUT = 2.5 V 10% to 100 % Load Step, FPWM..................................... 14
26 Output Ripple for VOUT = 2.5 V, 20 MHz BW............................................................................ 14
27 Output Ripple for VOUT = 2.5 V, 250 MHz BW .......................................................................... 14
28 Adjustable Output Board Layout - Top Overlay........................................................................ 15
29 Adjustable Output Board Layout - Top Soldermask................................................................... 15
30 Adjustable Output Board Layout - Top Layer Copper................................................................. 16
31 Adjustable Output Board Layout - Mid Layer 1 (under top layer) Copper .......................................... 16
32 Adjustable Output Board Layout - Mid Layer 2 (above bottom layer) Copper ..................................... 17
33 Adjustable Output Board Layout - Bottom Layer Copper............................................................. 17
34 Adjustable Output Board Layout - Bottom Soldermask ............................................................... 18
35 Adjustable Output Board Layout - Bottom Overlay .................................................................... 18
36 Fixed Output Board Layout - Top Overlay.............................................................................. 19
37 Fixed Output Board Layout - Top Soldermask......................................................................... 19
38 Fixed Output Board Layout - Top Layer Copper....................................................................... 20
39 Fixed Output Board Layout - Mid Layer 1 (under top layer) Copper ................................................ 20
40 Fixed Output Board Layout - Mid Layer 2 (above bottom layer) Copper ........................................... 21
41 Fixed Output Board Layout - Bottom Layer Copper................................................................... 21
42 Fixed Output Board Layout - Bottom Soldermask ..................................................................... 22
43 Fixed Output Board Layout - Bottom Overlay .......................................................................... 22

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User's Guide for the LMZM23601 and LMZM23600 Evaluation Boards
1 Description
The LMZM23601 and LMZM23600 are miniature, simple, and easy-to-use DC/DC converter modules ideal
for applications where board space is limited and an efficient power conversion is needed. Both the
LMZM23600 and the LMZM23601 support an input range of 4 V to 36 V. This range makes the modules
suitable to be powered from various 5-V, 12-V, or 24-V supplies. The LMZM23600 supports load current
of up to 0.5 A, and the LMZM23601 can deliver up to 1 A of current. Features of the devices include a
precision enable circuit, input UVLO circuit, built-in soft start, light load mode selection for exceptional
power savings or constant frequency operation, switching frequency synchronization to an external clock,
power-good flag, and current limit protection. More details about the operating range, features, and
specifications of the LMZM23601 and LMZM23600 can be found in the device data sheet.
The output voltage for the adjustable (ADJ) version can be configured between 2.5 V and 15 V. There are
also fixed output options of the devices for 5-V and 3.3-V outputs and each voltage option comes in two
output current choices: 0.5 A and 1 A. There are two main evaluation boards - one for the ADJ output
voltage options and one for the fixed 5-V and 3.3-V outputs. The ADJ output board comes in two variants,
one for the 1-A capable devices and one for the 0.5-A current option. The fixed output voltage option
boards also come in two output current variations. Table 1 summarizes the available evaluation boards for
this module family.
Table 1. Available Evaluation Boards
Output Voltage Output
Current Device Evaluation Board Orderable P/N Board ID
ADJ (2.5 V to 15 V) 1 A LMZM23601 LMZM23601EVM BSR017-001
ADJ (2.5 V to 15 V) 0.5 A LMZM23600 LMZM23600EVM BSR017-002
5 V 1 A LMZM23601V5 LMZM23601V5EVM BSR018-001
5 V 0.5 A LMZM23600V5 LMZM23600V5EVM BSR018-002
3.3 V 1 A LMZM23601V3 LMZM23601V3EVM BSR018-003
3.3 V 0.5 A LMZM23600V3 LMZM23600V3EVM BSR018-004

VIN POWER TERMINAL
VIN
SENSE POINT
VOUT TERMINAL
VOUT
SENSE POINT
GND TERMINAL
GND
SENSE POINT
TEST POINTS
ENABLE
CONNECTION
JUMPER
MODE
SELECTION
JUMPER
PGOOD FLAG
PULLUP VOLTAGE
JUMPER
VIN POWER TERMINAL
VIN
SENSE POINT
VOUT TERMINAL
VOUT
SENSE POINT
GND TERMINAL
GND
SENSE POINT
TEST POINTS
ENABLE
CONNECTION
JUMPER
MODE
SELECTION
JUMPER
PGOOD FLAG
PULLUP VOLTAGE
JUMPER
OUTPUT VOLTAGE
SETTING JUMPER
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User's Guide for the LMZM23601 and LMZM23600 Evaluation Boards
2 Getting Started
Figure 1. EVM User Interface for the Adjustable Output Voltage Options
Figure 2. EVM User Interface for the Fixed (5-V and 3.3-V) Output Voltage Options

EN connected to GND
The converter is OFF
EN connected to VIN
The converter is ON when the VIN
voltage is above the VIN UVLO
rising threshold
EN connected to VIN through a resistor divider
The converter is ON when the divider voltage is
above the EN rising threshold and the VIN
voltage is above the VIN UVLO
EN connected to the xEN terminal
Provide enable signal at the xEN
to turn the device ON
MODE connected to VIN
FPWM is enabled
MODE connected to GND
Auto PFM is enabled
Provide external clock at
SYNC to synchronize the
switching frequency
PGOOD pullup voltage
connected to VOUT
PGOOD pullup voltage connected to Vx
Provide external voltage at Vx for the
PGOOD flag logic HIGH level
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Figure 3. Jumper Configuration Details for Each Board
Before applying power to the EVM, ensure that all of the jumpers are in place and are properly positioned
for the intended feature setting and output voltage operation. Always shut down the input power supply
before changing any of the jumper settings. Figure 1 and Figure 3 above provide an overview of the board
connection terminals, jumper setting options, and test points.
Use the "VIN POWER TERMINAL" and "GND TERMINAL" turrets to connect the board to the input
supply. Connect the load between the "VOUT TERMINAL" and "GND TERMINAL".
For the adjustable output version of the board, the output voltage setting jumper configures the feedback
resistor divider pair for various popular output voltages: 2.5 V, 3.3 V, 5 V, 12 V, or 15 V. Voltage sense
points are provided to help read the input voltage and output voltage directly at the regulator. The sense
lines should not be used for power connections. There are several test points provided on the left hand
side of the board. They can be used to monitor the voltage signals at the MODE, EN, and PG pins of the
device.
The EN selection jumper allows the user to select the desired enabling scheme for the end application.
The LMZM23600 and LMZM23601 feature a precision enable input which can be used to set the input
UVLO point with a voltage divider from the input voltage. Alternatively, the enable input can be driven by a
logic signal or it could be tied directly to VIN for an always-on operation.
The MODE selection jumper sets the DC/DC converter mode of operation at light load. When Auto PFM
mode is selected, the converter will enter PFM mode at light load and reduce the switching frequency in
order to maintain high conversion efficiency. Some applications may require that the regulator maintains
constant switching frequency across the entire load range. In such cases the mode pin can be used to set
forced PWM operation at light load. The mode terminal can also be used to synchronize the converter
switching frequency to an external clock. If frequency synchronization is used, the converter will operate in
forced PWM mode at light load.
The PGOOD flag jumper allows the user to either connect the PGOOD pullup resistor to VOUT or provide
an external voltage rail for the logic HIGH voltage level.

LMZM23601SILR
LMZM23600SILR
Schematic www.ti.com
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3 Schematic
3.1 Adjustable Output Voltage Versions
Figure 4. Schematic for the Adjustable Output Voltage Versions of the Module

LMZM23601V5SILR
LMZM23600V5SILR
LMZM23601V3SILR
LMZM23600V3SILR
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3.2 Fixed Output Voltage Versions
Figure 5. Schematic for the Fixed Output Voltage Versions of the Module

Designator Quantity Value
Description Part Number Manufacturer
C1 1 10uF Input capacitor, 10 µF, 50 V, +/- 20%, X7R, 1210 C3225X7R1H106M250AC TDK
C2 1 47uF
Output capacitor, 47 µF, 16 V, +/- 15%, X5R,
1206
C3216X5R1C476M160AB TDK
C3 1 22uF
Output capacitor, 22 µF, 25 V, +/- 10%, X5R,
1206
GRM31CR61E226KE15L MuRata
J1 1 Header, 100mil, 4x2, Gold, TH TSW-104-07-G-D Samtec
J2 1 Header, 100mil, 3x2, Gold, TH TSW-103-07-G-D Samtec
J3 1 Header, 100mil, 3x1, Gold, TH HTSW-103-07-G-S Samtec
J4 1 Header, 100mil, 5x2, Gold, TH TSW-105-07-G-D Samtec
R1 1 25.5k Resistor, 25.5 k, 1%, 0.063 W, 0402 CRCW040225K5FKED Vishay-Dale
R2 1 38.3k Resistor, 38.3 k, 1%, 0.063 W, 0402 CRCW040238K3FKED Vishay-Dale
R3 1 20.5k Resistor, 20.5 k, 1%, 0.063 W, 0402 CRCW040220K5FKED Vishay-Dale
R4 1 43.2k Resistor, 43.2 k, 1%, 0.063 W, 0402 CRCW040243K2FKED Vishay-Dale
R5 1 178k Resistor, 178 k, 1%, 0.063 W, 0402 CRCW0402178KFKED Vishay-Dale
R6 1 76.8k Resistor, 76.8 k, 1%, 0.063 W, 0402 CRCW040276K8FKED Vishay-Dale
R7 1 887k Resistor, 887 k, 1%, 0.1 W, 0603 CRCW0603887KFKEA Vishay-Dale
R8, R9 2 100k Resistor, 100 k, 1%, 0.1 W, 0603 CRCW0603100KFKEA Vishay-Dale
SH-J1, SH-J2, SH-
J3, SH-J4
4
1x2 Shunt, 100mil, Gold plated, Black SNT-100-BK-G Samtec
TP1, TP2, TP3 3 Terminal, Turret, TH, Triple 1598-2 Keystone
TP4, TP6, TP9,
TP10, TP12,
TP13, TP15, TP17
8
Test Point, Multipurpose, Red, TH 5010 Keystone
TP5, TP7, TP8,
TP11, TP14, TP16
6
Test Point, Multipurpose, Black, TH 5011 Keystone
U1 1
Nano Module with 36 V Maximum Input Voltage,
SIL0010A (uSIP-10)
LMZM23601SILR for 1.0A
or LMZ23600SILR for 0.5A
Texas Instruments
Bill of Materials www.ti.com
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4 Bill of Materials
4.1 Adjustable Output Voltage Versions
Figure 6. Bill Of Materials for the Adjustable Output Voltage Versions of the Module

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4.2 Fixed Output Voltage Versions
Figure 7. Bill Of Materials for the Fixed Output Voltage Versions of the Module

VOUT Ripple
Time (1 µs/DIV)
(5 mV/DIV)
20MHz BW
VOUT Ripple
Time (1 µs/DIV)
(20 mV/DIV)
250MHz BW
VOUT
Time (500 µs/DIV)
(100 mV/DIV)
IOUT
(500 mA/DIV)
Output Current (A)
Efficiency (%)
0.0001 0.001 0.01 0.1 1 10
0
10
20
30
40
50
60
70
80
90
100
D006
VIN = 18V PFM
VIN = 18V FPWM
VIN = 22 V PFM
VIN = 22 V FPWM
VIN = 24 V PFM
VIN = 24 V FPWM
VIN = 36 V PFM
VIN = 36 V FPWM
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5 Performance Data
The following section demonstrates the LMZM23601 evaluation board performance using the adjustable
output voltage option of the device.
5.1 VOUT = 15 V
Figure 8. Efficiency for VOUT = 15 V Figure 9. Load Transient Response for VOUT = 15 V
10% to 100% Load Step, FPWM
Figure 10. Output Ripple for VOUT = 15 V, 20 MHz BW Figure 11. Output Ripple for VOUT = 15 V, 250 MHz BW

VOUT Ripple
Time (1 µs/DIV)
(5 mV/DIV)
20MHz BW
VOUT Ripple
Time (1 µs/DIV)
(20 mV/DIV)
250MHz BW
VOUT
Time (500 µs/DIV)
(100 mV/DIV)
IOUT
(500 mA/DIV)
Output Current (A)
Efficiency (%)
0.0001 0.001 0.01 0.1 1 10
0
10
20
30
40
50
60
70
80
90
100
D004
VIN = 15V PFM
VIN = 15V FPWM
VIN = 18 V PFM
VIN = 18 V FPWM
VIN = 24 V PFM
VIN = 24 V FPWM
VIN = 36 V PFM
VIN = 36 V FPWM
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5.2 VOUT = 12 V
Figure 12. Efficiency for VOUT = 12 V Figure 13. Load Transient Response for VOUT = 12 V
10% to 100% Load Step, FPWM
Figure 14. Output Ripple for VOUT = 12 V, 20 MHz BW Figure 15. Output Ripple for VOUT = 12 V, 250 MHz BW

VOUT Ripple
Time (1 µs/DIV)
(5 mV/DIV)
20MHz BW
VOUT Ripple
Time (1 µs/DIV)
(20 mV/DIV)
250MHz BW
VOUT
Time (500 µs/DIV)
(50 mV/DIV)
IOUT
(500 mA/DIV)
Output Current (A)
Efficiency (%)
0.0001 0.001 0.01 0.1 1 10
0
10
20
30
40
50
60
70
80
90
100
D002
VIN = 6.5V PFM
VIN = 6.5V FPWM
VIN = 12 V PFM
VIN = 12 V FPWM
VIN = 24 V PFM
VIN = 24 V FPWM
VIN = 36 V PFM
VIN = 36 V FPWM
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5.3 VOUT = 5 V
Figure 16. Efficiency for VOUT = 5 V Figure 17. Load Transient Response for VOUT = 5 V
10% to 100% Load Step, FPWM
Figure 18. Output Ripple for VOUT = 5 V, 20 MHz BW Figure 19. Output Ripple for VOUT = 5 V, 250 MHz BW

VOUT Ripple
Time (1 µs/DIV)
(5 mV/DIV)
20MHz BW
VOUT Ripple
Time (1 µs/DIV)
(20 mV/DIV)
250MHz BW
VOUT
Time (500 µs/DIV)
(50 mV/DIV)
IOUT
(500 mA/DIV)
Output Current (A)
Efficiency (%)
0.0001 0.001 0.01 0.1 1 10
0
10
20
30
40
50
60
70
80
90
100
D003
VIN = 5 V PFM
VIN = 5 V FPWM
VIN = 12 V PFM
VIN = 12 V FPWM
VIN = 24 V PFM
VIN = 24 V FPWM
VIN = 36 V PFM
VIN = 36 V FPWM
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5.4 VOUT = 3.3 V
Figure 20. Efficiency for VOUT = 3.3 V Figure 21. Load Transient Response for VOUT = 3.3 V
10% to 100% Load Step, FPWM
Figure 22. Output Ripple for VOUT = 3.3 V, 20 MHz BW Figure 23. Output Ripple for VOUT = 3.3 V, 250 MHz BW

VOUT Ripple
Time (1 µs/DIV)
(5 mV/DIV)
20MHz BW
VOUT Ripple
Time (1 µs/DIV)
(20 mV/DIV)
250MHz BW
VOUT
Time (500 µs/DIV)
(20 mV/DIV)
IOUT
(500 mA/DIV)
Output Current (A)
Efficiency (%)
0.0001 0.001 0.01 0.1 1 10
0
10
20
30
40
50
60
70
80
90
100
D005
VIN = 5 V PFM
VIN = 5 V FPWM
VIN = 12 V PFM
VIN = 12 V FPWM
VIN = 24 V PFM
VIN = 24 V FPWM
VIN = 36 V PFM
VIN = 36 V FPWM
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5.5 VOUT = 2.5 V
Figure 24. Efficiency for VOUT = 2.5 V Figure 25. Load Transient Response for VOUT = 2.5 V
10% to 100 % Load Step, FPWM
Figure 26. Output Ripple for VOUT = 2.5 V, 20 MHz BW Figure 27. Output Ripple for VOUT = 2.5 V, 250 MHz BW

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6 PCB Layout
This section of the user's guide describes the PCB layout of the LMZM23601 boards. The layout is the
same for the LMZM23600 versions.
The boards have 4 copper layers. The boards dimensions are 58 mm (2.3 inches) × 70 mm (2.75 inches).
6.1 Adjustable Output Voltage Versions
Figure 28. Adjustable Output Board Layout - Top Overlay
Figure 29. Adjustable Output Board Layout - Top Soldermask

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Figure 30. Adjustable Output Board Layout - Top Layer Copper
Figure 31. Adjustable Output Board Layout - Mid Layer 1 (under top layer) Copper

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Figure 32. Adjustable Output Board Layout - Mid Layer 2 (above bottom layer) Copper
Figure 33. Adjustable Output Board Layout - Bottom Layer Copper

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Figure 34. Adjustable Output Board Layout - Bottom Soldermask
Figure 35. Adjustable Output Board Layout - Bottom Overlay

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6.2 Fixed Output Voltage Versions
Figure 36. Fixed Output Board Layout - Top Overlay
Figure 37. Fixed Output Board Layout - Top Soldermask

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Figure 38. Fixed Output Board Layout - Top Layer Copper
Figure 39. Fixed Output Board Layout - Mid Layer 1 (under top layer) Copper