MAX15462B Eval Kit Datasheet by Maxim Integrated

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Evaluates: MAX154623 maxim Integrated ,,
Evaluates: MAX15462B
MAX15462B Evaluation Kit
19-7562; Rev 0; 3/15
General Description
The MAX15462B evaluation kit (EV kit) is a fully assem-
bled and tested circuit board that demonstrates the
performance of the MAX15462B 42V, 300mA ultra-small,
high-efficiency, synchronous step-down converter. The
EV kit operates over a wide 6.5V to 42V input voltage
range, and provides up to 300mA at the preset 5V output.
The device features undervoltage lockout, overcurrent
protection, and thermal shutdown. The EV kit switches
at a fixed frequency of 500kHz, and delivers a peak
efficiency of 92% with the supplied components.
The EV kit comes installed with the MAX15462BATA+
in an 8-pin (2mm x 2mm) lead(Pb)-free/RoHS-compliant
TDFN package.
Benefits and Features
6.5V to 42V Input Voltage Range
5V Output, 300mA Continuous Current
Internal Compensation
EN/UVLO for On/Off Control and Programmable
Input Undervoltage Lockout
92% Peak Efficiency
500kHz Fixed-Frequency PWM Operation
PFM or Forced-PWM Mode of Operation
Hiccup Mode Overcurrent Protection
Open-Drain RESET Output
Thermal Shutdown
Proven PCB Layout
Fully Assembled and Tested
Ordering Information appears at end of data sheet.
Quick Start
Recommended Equipment
MAX15462B EV kit
42V adjustable, 0.5A DC power supply
Electronic load up to 300mA
Voltmeter
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 and
JU2 (EN/UVLO).
2) Verify that jumper JU3 (MODE PFM operation) is open.
3) Set the electronic load to constant-current mode,
300mA, 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.
7) Connect the 24V power supply output to the VIN
PCB pad. Connect the supply ground to the GND
PCB pad.
8) Turn on the power supply and verify that VOUT is at
5V with respect to GND.
9) Enable the electronic load and verify that VOUT is at
5V with respect to GND.
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Evaluates: MAX15462B
MAX15462B Evaluation Kit
Detailed Description
The MAX15462B EV kit is a fully assembled and tested
circuit board that demonstrates the performance of
the MAX15462B 42V, 300mA ultra-small, high-efficien-
cy, synchronous step-down converter. The EV kit oper-
ates over a wide 6.5V to 42V input voltage range,
and provides up to 300mA at the preset 5V output.
The device features undervoltage lockout, overcurrent
protection, and thermal shutdown. The EV kit switches
at a fixed frequency of 500kHz, and delivers a peak
efficiency of 92% with the supplied components.
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 jumper JU3 are provided for
selecting the mode of operation of the converter. The
VCC PCB pad helps measure the internal LDO voltage.
An additional RESET PCB pad is available for monitoring
the open-drain logic output.
Enable Control (JU1, JU2)
The EN/UVLO pin of the device 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. Install a shunt across pins 1-2 on jumper JU2 to
disable VOUT. See Table 1 for proper jumper settings.
Additionally, resistors R1 and R2 are included to set the
UVLO to a desired turn-on voltage. Refer to the Enable
Input (EN/UVLO), Soft-Start section in the MAX15462 IC
data sheet for additional information on setting the UVLO
threshold voltage.
Active-Low, Open-Drain Reset Output (RESET)
The EV kit provides a PCB pad to monitor the status
of the RESET output. RESET goes high when VOUT
rises above 95% (typ) of its nominal regulated output
voltage. When VOUT falls below 92% (typ) of its nominal
regulated voltage, RESET is pulled low.
PFM or Forced-PWM Mode (MODE)
The EV kit includes a jumper (JU3) to program 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 light-load PFM oper-
ation. See Table 2 for proper JU3 configuration.
*Default position.
*Default position.
Table 1. Enable Control (EN/UVLO)
Table 2. Mode Control (JU3)
SHUNT POSITION EN/UVLO PIN VOUT OUTPUT
JU1 JU2
1-2 Open Connected to VIN Enabled
Open 1-2 Connected to GND Disabled
1-2* 1-2* Connected to midpoint of the
R1, R2 resistor-divider Enabled at VIN ≥ 6.5V
SHUNT POSITION MODE PIN MODE OF OPERATION
1-2 Connected to GND Forced PWM
Open* Unconnected PFM
EFFIC‘ENCV vs. LOAD CURRENT spouse URRENT To 15mm espouse RESPONSE— unnem AD CURRENT 0150mA] TO 30mm W
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Evaluates: MAX15462B
MAX15462B Evaluation Kit
20
30
40
50
60
70
80
90
100
110 100
EFFICIENCY (%)
LOAD CURRENT (mA)
EFFICIENCY vs.
LOAD CURRENT
toc01
V
IN
= 36V
V
IN
= 24V
V
IN
= 12V
PFM MODE
4.996
4.997
4.998
4.999
5
5.001
5.002
5.003
050 100 150 200 250 300
OUTPUT VOLTAGE (V)
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs.
LOAD CURRENT toc04
PWM MODE
V
IN
= 36V
V
IN
= 24V
V
IN
= 12V
LOAD TRANSIENT RESPONSE
PWM MODE (LOAD CURRENT
STEPPED FROM NO LOAD TO 150mA)
MAX15462B EV toc07
VOUT (AC)
100mV/div
IOUT
100mA/div
20µs/div
0
10
20
30
40
50
60
70
80
90
100
050 100 150 200 250 300
EFFICIENCY (%)
LOAD CURRENT (mA)
EFFICIENCY vs.
LOAD CURRENT toc02
V
IN
= 36V
V
IN
= 24V
V
IN
= 12V
PWM MODE
LOAD TRANSIENT RESPONSE
PFM MODE (LOAD CURRENT
STEPPED FROM 5mA TO 150mA)
MAX15462B EV toc05
VOUT (AC)
100mV/div
IOUT
100mA/div
100µs/div
SOFT-START
MAX15462B EV toc08
EN/UVLO
5V/div
IOUT
100mA/div
VOUT
1V/div
1ms/div
RESET
5V/div
4.98
5
5.02
5.04
5.06
5.08
5.1
050 100 150 200 250 300
OUTPUT VOLTAGE (V)
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs.
LOAD CURRENT toc03
PFM MODE
V
IN
= 36V
V
IN
= 24V
V
IN
= 12V
LOAD TRANSIENT RESPONSE—
PFM OR PWM MODE (LOAD CURRENT
STEPPED FROM 150mA TO 300mA)
MAX15462B EV toc06
VOUT (AC)
IOUT
A/div
20µs/div
BODE PLOT
MAX15462B EV toc09
2 4 6 8 1 2 4 6 8 1 2
GAIN (dB)
PHASE (°)
FREQUENCY (kHz)
1 10 100
-50
-40
-30
-20
-10
0
10
20
30
40
50
-180
-144
-108
-72
-36
0
36
72
108
144
180
GAIN
PHASE
fCR = 47kHz,
PHASE MARGIN = 60°
EV Kit Performance Report
Wm. MAXI5ASZB EVKIT Hun am mun. lemuxmn m 1mg um um CI [- JU1> -'5 EN/WLU 1 +K_l - 2 Jul (:2 vcc 1 2 El I U -2 g llfl- MODE JU3 “I -1 02/15 EA 2 REV—A k a: w z . (do 2'. m
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Evaluates: MAX15462B
MAX15462B Evaluation Kit
Figure 1. MAX15462B EV Kit Component Placement Guide—
Component Side
Figure 2. MAX15462B EV Kit PCB Layout—Component Side
Figure 3. MAX15462B EV Kit PCB Layout—Solder Side
1.0’’ 1.0’’
1.0’’
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Evaluates: MAX15462B
MAX15462B Evaluation Kit
#Denotes RoHS compliant.
PART TYPE
MAX15462BEVKIT# EVKIT
Ordering Information
Note: Indicate that you are using the MAX15462B when contacting these component suppliers.
SUPPLIER WEBSITE
Coilcraft, Inc. www.coilcraft.com
Murata Americas www.murata.com
Panasonic Corp. www.panasonic.com
Component Suppliers
Component Information and Schematic
See the following links for component information and
schematic:
MAX15462B EV BOM
MAX15462B EV Schematic
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.
6
Evaluates: MAX15462B
MAX15462B Evaluation Kit
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 3/15 Initial release
Revision History
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.
. . a Integrated m TITLE: REV: MAX15462E3 EVKIT A DRAWN: DATED: 2/15/2015 PCB PART NO. SIZE: SHEET I OF I B 5.5V to 60V APPROVAL DATED: 4%” 5v. 300nm LX HI “”5“” REVISION: DATED: EN/UVLO GND EN/UVLD 2 VOUT R3 VCC REVISION: DATED: IDDk R2 (sex 3 s "‘ x _ VCC VCC RESET m RESET 7 i REVISION: DATED: VCC MODE REVISION: DATED: REVISION: DATED: REVISION: DATED:
5.5V to 42V
Serial Mm Description Quantity 22;», suv Electro‘yu: capacitors 15.5mm x 6.5mm case we) CAP,1uF,10%,SOV,X7R,12UE CAP,luF,10%,6.3V,X7R,0503 CAP,1UuF,10%,6.3V,X7R,1206 INDUCTORAAAH, 550w: Rsswaszmnmmoz RES+,758KQ,1%,0402 RES+,IDDKQ,1%,0402 2 Pin Headersm 1m centers} POSITION nesignamr JULJUZJUB Pan Number MURATA GRMalMRnH 105K MURATA GRMISSWDJIDSK MURATA GRM31cR701106K COILCRAFT LP540187473ML
Serial No. Description Quantity Designator Part Number
1
22µF, 50V Electrolytic capacitors
(6.6mm x 6.6mm case size)
1C1 PANASONIC EEEFK1H220P
2CAP,F,10%,50V,X7R,1206 1C2 MURATA GRM31MR71H105K
3CAP,F,10%,6.3V,X7R,0603 1C3 MURATA GRM188R70J105K
4CAP,10µF,10%,6.3V,X7R,1206 1C4 MURATA GRM31CR70J106K
5INDUCTOR,47µH, 560mA 1L1 COILCRAFT LPS4018-473ML
6RES#,3.32M,1%,0402 1R1
7RES+,768K,1%,0402 1R2
8RES+,100K,1%,0402 1R3
942V, 300mA, High Efficiency, Integrated MOSFET,
Synchronous Step-Down Regulator (8 TDFN) 1U1 MAXIM MAX15462BATA+
10 2 Pin Headers(0.1in centers) 3JU1, JU2, JU3
11 SHORTING JUMPER, 2 POSITION, 0.1 CENTER 3SU1-SU3 Sullins STC02SYAN
Jumper Table
JUMPER
SHUNT
POSITION
JU1 1,2 SHORT
JU2 1,2 SHORT
JU3 OPEN
BILL OF MATERIALS (BOM) Revision 3/15

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