MAX16974EVKIT+ [MAXIM]
Fully Assembled and Tested;
| 型号： | MAX16974EVKIT+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Fully Assembled and Tested |
| 文件： | 总7页 (文件大小：724K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-5661; Rev 0; 12/10
MAX16974 Evaluation Kit
General Description
Features
S Wide 3.5V to 28V DC Supply Range
S 42V Input Transient Tolerance
S Proven PCB Layout
The MAX16974 evaluation kit (EV kit) provides a proven
design to evaluate the MAX16974 high-voltage, 2.2MHz,
2A automotive step-down controller with low operating
current. It is designed to operate with 3.5V to 28V input
voltages, while using only 35µA quiescent current at no
load. The switching frequency is adjustable from 220kHz
to 2.2MHz and the output voltage is pin selectable at 5V
fixed or 1V to 10V adjustable. This EV kit is initially set up
to operate at 2.2MHz with a 5V output.
S Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX16974EVKIT+
EV Kit
The EV kit PCB comes with a MAX16974AUE/V+ installed.
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
0.1µF Q10%, 6.3V X5R ceramic
capacitor (0402)
TDK C1005X5R0J104K
2.2µF Q10%, 10V X7R ceramic
capacitor (0603)
Murata GRM188R71A225K
CBST
1
1
0
CVL
D1
1
3A, 60V Schottky diode
Diodes Inc. B360B
5600pF Q10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H562K
1
CCOMP1
CCOMP2
JU1
1
0
3-pin header
JU2, JU7
Not installed, 0I jumpers (0603)
Not installed, 120pF Q5%, 50V
C0G ceramic capacitor (0603)
Murata GRM1885C1H121J
JU3, JU6,
RTEST
3
0I Q5% resistors (0603)
100pF Q5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H101J
4.7µH Q20%, 2.8A, 20mI
inductor (7.0mm x 7.5mm)
Panasonic ETQP5M4R7YFM
CCRES
CFB1
CIN1
1
0
1
L1
1
Not installed, ceramic capacitor
(0603)
Not installed, multipurpose test
point
LX
0
1
0
RCOMP
20kI Q1% resistor (0603)
47µF Q20%, 50V electrolytic
capacitor (D8)
Panasonic EEE-FK1H470XP
RFB1, RFB2,
RFB3
Not installed, resistors (0603)
RFOSC
RFSYNC
RRESB
1
1
1
12.1kI Q1% resistor (0603)
20kI Q5% resistor (0603)
10kI Q5% resistor (0603)
0.1µF Q10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H104K
CIN2, CIN3
CIN4, CIN5
COUT, COUT2
CSNUB
2
2
2
0
Not installed, 3I Q5% resistor
(0603)
4.7µF Q10%, 50V X7R ceramic
capacitors (1210)
Murata GRM32ER71H475K
RSNUB
0
High-voltage automotive step-
down converter (16 TSSOP-EP*)
Maxim MAX16974AUE/V+
U1
1
22µF Q20%, 10V X7R ceramic
capacitors (1210)
Murata GRM32ER71A226K
—
1
1
Shunts
PCB: MAX16974 EVALUATION
KIT+
Not installed, 1000pF Q10%, 50V
X7R ceramic capacitor (0603)
Murata GRM188R71H102K
—
*EP = Exposed pad.
/V denotes an automotive qualified part.
_______________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX16974 Evaluation Kit
Component Suppliers
SUPPLIER
Diodes Incorporated
PHONE
WEBSITE
805-446-4800
770-436-1300
800-344-2112
847-803-6100
www.diodes.com
Murata Electronics North America, Inc.
Panasonic Corp.
www.murata-northamerica.com
www.panasonic.com
TDK Corp.
www.component.tdk.com
Note: Indicate that you are using the MAX16974 when contacting these component suppliers.
External Clock Input (FSYNC)
Quick Start
Recommended Equipment
The IC synchronizes to an external clock signal applied
at FSYNC. The signal at FSYNC must have a 10% higher
frequency than the internal clock period for proper
synchronization.
•ꢀ MAX16974ꢀEVꢀkit
•ꢀ 12Vꢀatꢀ2AꢀDCꢀpowerꢀsupply
•ꢀ Digitalꢀvoltmeterꢀ(DVM)
•ꢀ 2AꢀDCꢀloadꢀ(2.5I, 10W)
Output-Voltage/RESET Threshold
Resistive-Divider Network
The output voltage of the IC can be programmed
between 1V and 10V. Although the IC’s output voltage
and reset threshold can be set individually, the EV kit
supports the use of a combined resistive-divider network
to set the desired output voltage and the reset threshold
using three resistors (RFB1, RFB2, and RFB3). Use the
following formula to determine the RFB3 of the resistive-
divider network:
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation:
1) Verify that all jumpers (JU1, JU2, JU3, JU6, and JU7)
are in their default positions, as shown in Table 1.
2) Connect the DVM between the VOUT and GND pads.
3) Connect the load between the VOUT and GND pads.
4) Connect the power supply between the EXT_VBAT
and GND pads.
RFB3= RFB1+RFB2+RFB3 × V
/V
(
)
REF OUT
where V
= 1V and V
is the desired output voltage.
REF
OUT
5) Enable the 12V power supply.
6) Verify that VOUT = 5V.
RFB2= RFB1+RFB2 +RFB3 × V
/V
− RFB3
(
(
)
)
REF_RES RES
7) Verify that RESB is high.
where V
is 1.2V (refer to the Electrical
REF_RES
Characteristics section in the MAX16974 IC data sheet)
and V is the desired reset threshold in volts.
Detailed Description of Hardware
The MAX16974 EV kit provides a proven layout for the
MAX16974 IC. The EV kit is designed to fully demon-
strate the functionality of the IC as follows:
RES
The precision of the reset-threshold function is depen-
dent on the tolerance of the resistors used for the divider.
Refer to the MAX16974 IC data sheet for details.
•ꢀ Verifyꢀoutput-voltageꢀregulation
Some applications require the addition of a compensa-
tion capacitor at CFB1. Contact the factory for applica-
tions assistance.
•ꢀ Verifyꢀ power-goodꢀ behaviorꢀ andꢀ reset-thresholdꢀ
selection
•ꢀ Easyꢀ programmabilityꢀ ofꢀ differentꢀ outputꢀ voltagesꢀ
The 0I resistors at JU3 and JU6 must be moved to
locations JU2 and JU7 to enable the combined resistive-
divider network. As shipped from the factory, the 0I
resistors are installed at JU3 and JU6, so that FB is tied
to VL and RESETI is tied to ground, selecting the factory
settings.
between 1V and 10V
•ꢀ Startupꢀandꢀshutdownꢀperformance
•ꢀ Current-limitꢀperformance
The following detailed descriptions enable the user to
program the EV kit per application requirements.
2
______________________________________________________________________________________
MAX16974 Evaluation Kit
The RES signal is asserted when RESETI is below 1.2V.
The RFB1, RFB2, and RFB3 values should be chosen to
set RESETI = 1.2V when the OUT voltage is too low. The
recommended resistor-divider bias current is 50FA.
comparator is 1.25V. The CRES pin sources approxi-
mately 10µA current. Placing a capacitor (CCRES) from
CRES to GND programs the delay time of the power-
good indicator.
Reset-Timeout Selection
The CRES pin of the IC is for programming the power-
good delay for the IC. The internal threshold of the CRES
Output-Voltage Selection
Contact the factory for assistance in selecting compo-
nents for other output voltages.
Table 1. Jumper Descriptions (JU1, JU2, JU3, JU6, JU7)
JUMPER
SIGNAL
SHUNT POSITION
DESCRIPTION
EN is tied to VSUP (battery input); normal operation.
EN is tied to GND; shutdown.
1-2*
2-3
JU1
EN
Output voltage is determined by RFB1, RFB2, and RFB3. OUT regulates
FB to 1.00V at the RFB2/RFB3 junction. JU3 must be open.
0I jumper installed
JU2
JU3
JU6
FB
FB
Open*
0I jumper installed*
Open
JU3 should be installed. See the JU3 description.
FB is tied to BIAS; the output voltage is preset to 5V. JU2 must be open.
JU2 should be installed. See the JU2 description.
RESETI is tied to GND; the reset threshold is preset to 90% of VOUT.
JU7 must be open.
0I jumper installed*
Open
RESETI
JU7 should be installed. See the JU7 description.
Reset threshold is determined by RFB1, RFB2, and RFB3. Reset occurs
when RESETI drops down to 1.2V. JU6 must be open.
0I jumper installed
Open*
JU7
RESETI
JU6 should be installed. See the JU6 description.
*Default position.
_______________________________________________________________________________________
3
MAX16974 Evaluation Kit
Figure 1. MAX16974 EV Kit Schematic
4
______________________________________________________________________________________
MAX16974 Evaluation Kit
1.0”
1.0”
Figure 3. MAX16974 EV Kit PCB Layout—Component Side
Figure 2. MAX16974 EV Kit Component Placement Guide—
Component Side
1.0”
Figure 4. MAX16974 EV Kit PCB Layout—Ground Layer 2
_______________________________________________________________________________________
5
MAX16974 Evaluation Kit
1.0”
1.0”
Figure 6. MAX16974 EV Kit PCB Layout—Solder Side
Figure 5. MAX16974 EV Kit PCB Layout—Layer 3
1.0”
Figure 7. MAX16974 EV Kit Component Placement Guide—
Solder Side
6
______________________________________________________________________________________
MAX16974 Evaluation Kit
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
12/10
Initial release
—
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
7
©
2010 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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