MAX17532 5V Output Evaluation
Kit (µMAX)
General Description
Evaluates: MAX17532 (µMAX) in 5V
Output-Voltage Application
Procedure
The MAX17532 5V evaluation kit (EV kit) (µMAX®) is a
fully assembled and tested circuit board that demonstrates
the performance of the MAX17532 42V, 100mA ultrasmall, high-efficiency, synchronous step-down DC-DC
converter in a 10-pin µMAX package. The EV kit operates over
a wide input voltage range of 6V to 42V and provides
up to 100mA load current at 5V output. It draws only
26µA supply current under no-load conditions (EN/UVLO
connected to VIN). The EV kit is programmed to switch at a
frequency of 220kHz. The device is simple to use and easily
configurable with minimal external components. It
features cycle-by-cycle peak current-limit protection,
undervoltage lockout and thermal shutdown.
The EV kit comes installed with the MAX17532AUB+ in
an 10-pin (3mm x 3mm), lead(Pb)-free/RoHS-compliant
µMAX package.
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation. Caution: Do not turn on
the power supply until all connections are completed.
Features
7) Connect the power-supply output to the VIN PCB
pad. Connect the supply ground to the GND PCB
pad.
●●
6V to 42V Input Voltage Range
●●
5V Output, 100mA Continuous Current
●●
26µA No-Load Supply Current
●●
EN/UVLO for On/Off Control and Programmable
Input Undervoltage Lockout
●●
Programmable Switching Frequency
●●
Internal or Programmable Soft-Start
●●
PFM or Forced-PWM Mode of Operation
●●
RESET Output
●●
Peak Current-Limit Protection
●●
Thermal Shutdown
●●
Proven PCB Layout
●●
Fully Assembled and Tested
Quick Start
Recommended Equipment
●●
●●
●●
●●
MAX17532 5V EV kit (µMAX)
42V adjustable, 0.5A DC power supply
Electronic load up to 100mA
Voltmeter
μMAX is a registered trademark of Maxim Integrated Products,
Inc.
19-7710; Rev 0; 7/15
1) Verify that shunts are installed on jumpers JU1 and
JU2 (EN/UVLO).
2) Verify that JU3 (MODE-PFM operation) is open.
3) Set the electronic load to constant-current mode,
100mA, and disable the electronic load.
4) Connect the electronic load’s positive terminal to the
VOUT PCB pad. Connect the negative terminal to
the GND PCB pad.
5) Connect the voltmeter across the VOUT and GND
PCB pads.
6) Set the power-supply output to 24V. Disable the
power supply.
8) Turn on the power supply.
9) Enable the electronic load and verify that output
voltage is 5V with respect to GND.
10) Vary the input voltage from 6V to 42V.
11) Vary the load current from 1mA to 100mA and verify
that output voltage is 5V with respect to GND.
Note: While performing an output short-circuit test, it is
possible for the ceramic output capacitor to oscillate with
the wiring inductance between the capacitor and shortcircuited load, and thereby cause the absolute maximum
rating of VOUT pin (-0.3V) to be exceeded. The resistor
(R7) and the capacitor (C5) are included on this EV kit
to protect against unintentional violation of the abovementioned rating. In the actual system design, parasitic
board or wiring inductance should be minimized and the
output-voltage waveform under short-circuit operation
should be verified to ensure that the absolute maximum
rating of VOUT pin is not exceeded.
Ordering Information appears at end of data sheet.
Evaluates: MAX17532 (µMAX) in 5V
Output-Voltage Application
MAX17532 5V Output Evaluation Kit
(µMAX)
RESET Output
Detailed Description
The MAX17532 5V EV kit (µMAX) is a fully assembled and
tested circuit board that demonstrates the performance
of the MAX17532 42V, 100mA ultra-small, high-efficiency,
synchronous step-down DC-DC converter in a 10-pin
µMAX package. The EV kit operates over a wide input
voltage range of 6V to 42V and provides up to 100mA
load current at 5V output. It draws only 26µA supply
current under no-load conditions (EN/UVLO connected to
VIN). The EV kit is programmed to switch at a frequency of
220kHz. The device is simple to use and easily configurable
with minimal external components. It features cycle-bycycle peak current-limit protection, undervoltage lockout
and thermal shutdown.
The EV kit provides a PCB pad to monitor the status of
the RESET output. RESET goes high when output voltage rises above 95% (typ) of its nominal regulated output
voltage. RESET goes low when output voltage falls below
92% (typ) of its nominal regulated voltage.
The EV kit includes an EN/UVLO PCB pad and jumpers
JU1 and JU2 to enable control of the converter output.
The MODE PCB pad and JU3 are provided for selecting
the mode of operation of the converter. RESET PCB pad
is available for monitoring the RESET output. The RT/
SYNC PCB pad can be used to synchronize the EV kit
switching frequency to an external clock frequency.
The EV kit offers a fixed 5ms soft-start time. Connect the
capacitor C4 to adjust the soft-start time (tSS). The minimum soft-start time is related to the output capacitance
(COUT) and the output voltage (VOUT) by the following
equation:
Enable Control (JU1, JU2)
The EN/UVLO pin on the EV kit serves as an on/off control
while also allowing the user to program the input undervoltage lockout (UVLO) threshold. Jumpers JU1 and JU2
configure the EV kit’s output for turn-on/turn-off control.
See Table 1 for proper JU1, JU2 jumper configurations.
Additionally, resistors R1 and R2 are included to set the
UVLO to a desired turn-on voltage. Refer to the Setting
the Input Undervoltage-Lockout Level section in the
MAX17532 IC data sheet for additional information on
setting the UVLO threshold voltage.
PFM or Forced-PWM Mode (MODE)
The EV kit includes JU3 to select the mode of operation of
the converter. Install a shunt across JU3 before powering
up the EV kit to enable the forced-PWM operation. Keep
JU3 open to enable the light-load PFM operation. See
Table 2 for proper JU3 settings.
Soft-Start
tSS > 0.05 x COUT x VOUT
where tSS is in milliseconds and COUT is in µF.
Use the following equation to determine the soft-start
capacitance value (CSS):
CSS = 6.25 x tSS
where tSS is in milliseconds and CSS is in nanofarads.
External Synchronization (RT/SYNC)
The EV kit provides a PCB pad to synchronize the EV kit
switching frequency to an external clock frequency. Refer
to the External Synchronization (RT/SYNC) section in the
MAX17532 IC data sheet for additional information on
configuring the external clock.
Table 1. Enable Control (EN/UVLO) (JU1, JU2)
SHUNT POSITION
JU1
JU2
EN/UVLO PIN
VOUT OUTPUT
1-2
Open
Connected to VIN
Enabled
Open
1-2
Connected to GND
Disabled
1-2*
1-2
Connected to midpoint of R1/R2 resistor-divider
Enabled at VIN ≥ 6V
*Default position.
Table 2. MODE Control (JU3)
SHUNT POSITION
MODE PIN
MODE OF OPERATION
1-2
Connected to GND
Forced PWM
Open*
Unconnected
PFM
*Default position.
www.maximintegrated.com
Maxim Integrated │ 2
Evaluates: MAX17532 (µMAX) in 5V
Output-Voltage Application
MAX17532 5V Output Evaluation Kit
(µMAX)
EV Kit Performance Report
EFFICIENCY vs. LOAD CURRENT toc1
95
EFFICIENCY vs. LOAD CURRENT
100
toc2
90
80
VIN = 24V
75
VIN = 36V
VIN = 36V
VIN = 24V
50
40
VIN = 12V
20
10
PFM MODE
1
60
30
VIN = 12V
70
65
70
OUTPUT VOLTAGE (V)
85
10
PWM MODE
0
0
100
20
40
60
80
5.04
5.01
VIN = 24V
4.95
4.92
100
0
20
40
60
80
100
LOAD CURRENT (mA)
LOAD TRANSIENT RESPONSE,
PFM MODE (LOAD CURRENT STEPPED
FROM 5mA to 50mA)
LOAD TRANSIENT RESPONSE
PFM OR PWM MODE (LOAD CURRENT
STEPPED FROM 50mA TO 100mA)
toc5
toc4
VIN = 36V
VIN = 12V
4.98
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs. LOAD CURRENT
toc3
PFM MODE
5.07
80
EFFICIENCY (%)
EFFICIENCY (%)
90
OUTPUT VOLTAGE vs. LOAD CURRENT
5.10
toc6
PWM MODE
4.946
OUTPUT VOLTAGE (V)
4.945
4.944
VOUT(AC)
4.944
100mV/div
VIN = 12V VIN = 24V
VIN = 36V
4.943
100mV/div
VOUT(AC)
4.942
4.941
4.940
50mA/div
IOUT
4.941
0
20
40
60
80
100
IOUT
50mA/div
LOAD CURRENT (mA)
200µs/div
LOAD TRANSIENT RESPONSE
PWM MODE (LOAD CURRENT STEPPED
FROM NO LOAD TO 50mA)
SOFT START
toc7
100µs/div
BODE PLOT
toc8
toc9
5V/div
VOUT(AC)
100mV/div
VEN/UVLO
2V/div
PHASE
VOUT
50mA/div
IOUT
50mA/div
100µs/div
www.maximintegrated.com
IOUT
VRESET
5V/div
GAIN
fCR = 8.5kHz,
PHASE MARGIN = 64°
1ms/div
Maxim Integrated │ 3
MAX17532 5V Output Evaluation Kit
(µMAX)
Evaluates: MAX17532 (µMAX) in 5V
Output-Voltage Application
Component Suppliers
SUPPLIER
WEBSITE
Coilcraft, Inc.
www.coilcraft.com
Murata Americas
www.murata.com
Panasonic Corp.
www.panasonic.com
Component List and Schematic
See the following links for component information and
schematic:
●● MAX17532EV µMAX BOM
●● MAX17532EV µMAX Schematic
www.maximintegrated.com
Maxim Integrated │ 4
MAX17532 5V Output Evaluation Kit
(µMAX)
Figure 1. MAX17532 5V EV Kit (µMAX) Component Placement
Guide—Component Side
Evaluates: MAX17532 (µMAX) in 5V
Output-Voltage Application
Figure 2. MAX17532 5V EV Kit (µMAX) PCB Layout—
Component Side
Figure 3. MAX17532 5V EV Kit (µMAX) PCB Layout—Solder
Side
www.maximintegrated.com
Maxim Integrated │ 5
MAX17532 5V Output Evaluation Kit
(µMAX)
Evaluates: MAX17532 (µMAX) in 5V
Output-Voltage Application
Ordering Information
PART
MAX17532AUBEVKIT#
TYPE
EV Kit
#Denotes RoHS compliant.
www.maximintegrated.com
Maxim Integrated │ 6
MAX17532 5V Output Evaluation Kit
(µMAX)
Evaluates: MAX17532 (µMAX) in 5V
Output-Voltage Application
Revision History
REVISION
NUMBER
REVISION
DATE
0
7/15
DESCRIPTION
Initial release
PAGES
CHANGED
—
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.
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 specifications without notice at any time.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2015 Maxim Integrated Products, Inc. │ 7
U1
MAX17532AUB+
VIN
6V TO 42V
IN
LX
10
1
+
1UF
50V
R1
3.01M
2
2
RT/SYNC
JU1
GND
EN/UVLO VOUT
6
0.22UF
191K
1
22.1
C5
3
4
R3
RT/SYNC
SS
FB
5
R4
261K
R5
49.9K
C4
OPEN
MODE
JU2
RESET
MODE
RESET
7
1
8
VOUT
2
R6
R2
787K
JU3
100K
2
GND
9
C6
47PF
1
EN/UVLO
GND
10UF
6.3V
R7
2
GND
C3
C2
C1
22UF
50V
VOUT
5V,100MA
2
1
1
VOUT
L1
220UH
BILL OF MATERIALS (BOM) Revision 6/15
Serial No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Description
22μF, 50V electrolytic capacitor (6.3mm x 6.3mm)
1μF ±10%, 50V X7R ceramic capacitor (0805)
10μF ±10%, 6.3V X7R ceramic capacitor (1206)
Not installed, OPEN (0402)
0.22µF ±10%, 16V X7R ceramic capacitor (0402)
47pF ±5% 50V COG ceramic capacitor (0402)
2-pin headers
220µH, 235mA inductor
3.01M ohm ±1%, resistor (0402)
787k ohm ±1%, resistor (0402)
191k ohm ±1%, resistor (0402)
261k ohm ±1%, resistor (0402)
49.9k ohm ±1%, resistor (0402)
100k ohm ±1%, resistor (0402)
22.1 ohm ±1%, resistor (0402)
42V, 100mA, ultra-small, highefficiency, synchronous stepdown DC-DC converter with 22μA noload supply current (10
µMAX-EP*) Maxim MAX17532AUB+
Quantity
1
1
1
0
1
1
3
1
1
1
1
1
1
1
1
Designator
C1
C2
C3
C4
C5
C6
JU1-JU3
L1
R1
R2
R3
R4
R5
R6
R7
Part Number
PANASONIC EEEFK1H220P
MURATA GRM21BR71H105K
Murata GRM31CR70J106K
1
U1
MAX17532AUB+
Shunt
3
See Jumper Table
SULLINS STC02SYAN
Murata GRM155R71C224K
MURATA GRM1555C1E470J
Sullins: PTC36SAAN
Coilcraft LPS5030-224M
Jumper Table
JUMPER
JU1
JU2
JU3
SHUNT POSITION
1-2
1-2
OPEN