Evaluates: MAX17530 (µMAX) in 5V Output Voltage Applications

Evaluates: MAX17530 (µMAX) in 5V Output Voltage Applications
Evaluates: MAX17530 (µMAX) in
5V Output Voltage Applications
MAX17530 5V Output
Evaluation Kit (µMAX)
General Description
The MAX17530 5V evaluation kit (EV kit) (µMAX) is a fully
assembled and tested circuit board that demonstrates the
performance of the 42V, 25mA 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 25mA 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 comes installed with the MAX17530AUB+ in
a 10-pin (3mm x 3mm) lead (Pb)-free/RoHS-compliant
µMAX package.
Procedure
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.
1) Verify that shunts are installed on jumpers JU1, JU2
(EN/UVLO).
2) Verify that JU3 (MODE-PFM operation) is open.
3) Set the electronic load to constant-current mode,
25mA, 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.
Features
●●
6V to 42V Input Voltage Range
7) Connect the power-supply output to the VIN PCB
pad. Connect the supply ground to the GND PCB
pad.
●●
5V Output, 25mA Continuous Current
8) Turn on the power supply.
●●
26µA No-Load Supply Current
9)
●●
EN/UVLO for On/Off Control and Programmable
Input Undervoltage Lockout
10) Vary the input voltage from 6V to 42V.
●●
Programmable Switching Frequency
●●
Internal or Programmable Soft-Start
●●
PFM or Forced-PWM Mode of Operation
●●
Open-Drain RESET Output
●●
Peak Current-Limit Protection
●●
Thermal Shutdown
●●
Proven PCB Layout
●●
Fully Assembled and Tested
Enable the electronic load and verify that output voltage
is 5V with respect to GND.
11) Vary the load current from 1mA to 25mA and verify
that output voltage is 5V with respect to GND.
Recommended Equipment
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 the VOUT pin (-0.3V) to be exceeded. The
resistor (R7) and the capacitor (C5) are included on this
evaluation kit to protect against unintentional violation of
the above mentioned 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 the VOUT pin is not exceeded.
●●
MAX17530 5V EV kit (µMAX)
●●
42V adjustable, 0.5A DC power supply
Ordering Information appears at end of data sheet.
●●
Electronic load up to 25mA
●●
Voltmeter
Quick Start
µMAX is a registered trademark of Maxim Integrated Products, Inc.
19-7693; Rev 0; 6/15
Evaluates: MAX17530 (µMAX) in
5V Output Voltage Applications
MAX17530 5V Output
Evaluation Kit (µMAX)
RESET Output
Detailed Description
The MAX17530 5V EV kit (µMAX) is a fully assembled and
tested circuit board that demonstrates the performance of
the 42V, 25mA 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 25mA 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 provides a PCB pad to monitor the status of
the RESET output. RESET goes high when the 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. A 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
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. 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
MAX17530 IC data sheet for additional information on
setting the UVLO threshold voltage.
PFM or Forced-PWM Mode (MODE)
The EV kit includes a 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 section in the MAX17530
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.
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Maxim Integrated │ 2
Evaluates: MAX17530 (µMAX) in
5V Output Voltage Applications
MAX17530 5V Output
Evaluation Kit (µMAX)
EV Kit Performance Report
90
80
80
60
VIN = 24V
VIN = 12V
EFFICIENCY (%)
EFFICIENCY (%)
90
70
VIN = 36V
50
40
30
toc2
10
1
70
60
VIN = 24V
50
VIN = 36V
VIN = 12V
40
30
0
5.00
OUTPUT VOLTAGE
vs. LOAD CURRENT
5
10
15
20
4.94
25
VIN = 24V
VIN = 36V
PFM MODE
0
5
10
15
20
25
LOAD CURRENT (mA)
LOAD TRANSIENT RESPONSE
PFM OR PWM MODE (LOAD CURRENT
STEPPED FROM 12.5mA TO 25mA)
LOAD TRANSIENT RESPONSE,
PFM MODE (LOAD CURRENT STEPPED
toc5
FROM 5mA to 17.5mA)
toc4
VIN = 12V
4.98
LOAD CURRENT (mA)
LOAD CURRENT (mA)
4.96
5.02
4.96
PWM MODE
0
10
toc3
5.04
10
PFM MODE
OUTPUT VOLTAGE
vs. LOAD CURRENT
5.06
20
20
0
EFFICIENCY vs. LOAD CURRENT
100
OUTPUT VOLTAGE (V)
EFFICIENCY vs. LOAD CURRENT toc1
100
toc6
4.96
VOUT
(AC)
OUTPUT VOLTAGE (V)
4.96
4.96
VIN = 12V
4.95
VIN = 24V
VOUT (AC)
50mV/div
IOUT
10mA/div
FIGURE6
APPLICATION CIRCUIT
VOUT=5V
4.95
4.95
100mV/div
VIN = 36V
4.95
IOUT
4.95
4.94
10mA/div
PWM MODE
0
5
10
15
20
25
400µs/div
LOAD CURRENT (mA)
LOAD TRANSIENT RESPONSE
PWM MODE (LOAD CURRENT STEPPED
FROM NO LOAD TO 12.5mA)
SOFT START
toc7
200µs/div
BODE PLOT
toc8
toc9
5V/div
VEN/UVLO
VOUT
10mA/div
IOUT
IOUT
10mA/div
200µs/div
www.maximintegrated.com
PHASE
2V/div
fCR = 10.6kHz,
PHASE MARGIN = 62°
GAIN
PHASE (°)
50mV/div
GAIN (dB)
VOU T(AC)
5V/div
VRESET
1ms/div
FREQUENCY(Hz)
Maxim Integrated │ 3
MAX17530 5V Output
Evaluation Kit (µMAX)
Evaluates: MAX17530 (µMAX) in
5V Output Voltage Applications
Component Suppliers
SUPPLIER
WEBSITE
Coilcraft, Inc.
www.coilcraft.com
Murata Americas
www.murata.com
Panasonic Corp.
www.panasonic.com
Note: Indicate that you are using the MAX17530AUB when contacting these component suppliers.
Component List and Schematic
See the following links for component information and
schematic:
●● MAX17530EV µMAX BOM
●● MAX17530EV µMAX Schematic
www.maximintegrated.com
Maxim Integrated │ 4
MAX17530 5V Output
Evaluation Kit (µMAX)
Figure 1. MAX17530 5V EV Kit (µMAX) Component Placement
Guide—Component Side
Evaluates: MAX17530 (µMAX) in
5V Output Voltage Applications
Figure 2. MAX17530 5V EV Kit (µMAX) PCB Layout—
Component Side
Figure 3. MAX17530 5V EV Kit (µMAX) PCB Layout—
Solder Side
www.maximintegrated.com
Maxim Integrated │ 5
Evaluates: MAX17530 (µMAX) in
5V Output Voltage Applications
MAX17530 5V Output
Evaluation Kit (µMAX)
Ordering Information
PART
MAX17530AUBEVKIT#
TYPE
EV Kit
#Denotes RoHS compliant.
www.maximintegrated.com
Maxim Integrated │ 6
MAX17530 5V Output
Evaluation Kit (µMAX)
Evaluates: MAX17530 (µMAX) in
5V Output Voltage Applications
Revision History
REVISION
NUMBER
REVISION
DATE
0
6/15
DESCRIPTION
Initial release
PAGES
CHANGED
—
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
MAX17530AUB+
VIN
6V TO 42V
IN
LX
10
1
+
50V
1UF
R1
3.01M
50V
2
GND
2
EN/UVLO VOUT
9
6
C6
47PF
3
4
RT/SYNC
SS
FB
5
R4
261K
R5
49.9K
1
R3
191K
GND
R7
22.1
C5
0.22UF
1
EN/UVLO
GND
2
RT/SYNC
JU1
C4
OPEN
MODE
JU2
RESET
MODE
RESET
7
1
8
VOUT
2
R6
R2
787K
JU3
100K
2
GND
C3
10UF
6.3V
C2
C1
22UF
VOUT
5V,0.025A
2
1
1
VOUT
L1
1000UH
BILL OF MATERIALS (BOM) 5/15 Revision
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 (0805)
Not installed, OPEN (0402)
0.22µF ±10%, 16V X7R ceramic capacitor (0402)
47pF ±5% 50V COG ceramic capacitor (0402)
2-pin headers
1000µH, 110mA 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, 25mA, ultra-small, highefficiency, synchronous step-down DC-DC
converter with 22μA noload supply current (10 µMAX-EP*) Maxim
MAX17530AUB+
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 GRM21BR70J106K
1
U1
MAX17530AUB+
Shunt
3
See Jumper
Table
SULLINS STC02SYAN
Murata GRM155R71C224K
MURATA GRM1555C1E470J
Sullins: PTC36SAAN
Coilcraft LPS5030-105M
Jumper Table
JUMPER
JU1
JU2
JU3
SHUNT POSITION
1-2
1-2
OPEN
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