Datenblatt für MAX77596 Eval Kit von Analog Devices Inc./Maxim Integrated

Evaluates: MAX77596 maxim Integrated ,,
Evaluates: MAX77596
MAX77596 Evaluation Kit
General Description
The MAX77596 evaluation kit (EV kit) demonstrates the
MAX77596 synchronous step-down converter IC with
integrated switches. The EV kit operates over a wide
input range of 3.5V to 24V and can support loads up to
300mA. The EV kit comes standard with the 3.3V fixed
output voltage version of the IC. It can be easily modified
to evaluate the 5V fixed output version or the adjustable
output voltage version.
The EV kit includes jumpers to enable or disable the
device, as well as to select either forced-PWM mode
(FPWM) or skip-mode operation. A RESETB test point is
available to monitor the voltage quality of the converter’s
output.
Features
● Evaluates Both Fixed-Output and Adjustable-Output
Versions (3.3V Version Is Preinstalled)
●3.5V to 24V Input Voltage Range
● 300mA Maximum Load
●Demonstrates 1.1µA Quiescent Current at 14V Input
●RESET Output Test Point
● Simple Two-Layer Board Serves as a Reference
Design
● Proven PCB Layout
●Fully Assembled and Tested
19-7752; Rev 1; 3/16
Ordering Information appears at end of data sheet.
Quick Start
Required Equipment
●MAX77596 EV kit
●DC power supply capable of supplying 24V, 300mA
●Variable load capable of sinking 300mADC at 3.3V
●Two voltmeters
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation. Read all the steps before
proceeding with step 1.
1) Verify that the IC is enabled by installing a shunt on
pins 1-2 on jumper J1.
2) Verify that IC is operating in skip mode by installing a
shunt on pins 2-3 on jumper J2.
3) Set the DC power supply to 0V.
4) Set the variable load to 0mA.
5) Connect the positive and negative terminals of
the power supply to the VIN and GND1 test pads,
respectively.
6) Connect terminals of the variable load to the VOUT
and GND2 test pads. Observe the positive and
negative polarity requirements of the variable load,
if there are any (VOUT is positive and GND2 is
negative).
7) Attach a voltmeter across the VOUT and GND2 test
pads.
8) Attach a voltmeter across the RESETB and GND2
test pads.
9) Ramp the DC power-supply voltage from 0 to 12V.
10) Verify that the voltmeter connected to VOUT
measures approximately 3.3V.
11) Verify that the voltmeter connected to RESETB
measures approximately 5V.
12) Enable the variable load and ramp the load current
from 0mA to 300mA.
13) Repeat steps 10 and 11.
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Evaluates: MAX77596
MAX77596 Evaluation Kit
Detailed Description of Hardware
The MAX77596 EV kit is a fully assembled and tested
circuit board to evaluate the performance of the MAX77596
step-down converter IC. The EV kit operates over a 3.5V
to 24V input voltage range, while consuming only 1.1µA
of quiescent current at 14VIN and 0mA load (fixed-output
voltage version).
The EV kit can be configured to operate in forced-PWM
mode (FPWM) or low-quiescent current skip mode using
jumper J2. The IC can be enabled or disabled using jump-
er J1. The RESETB test point connects to the IC’s RESET
output, which monitors output-voltage quality. Refer to the
MAX77596 IC data sheet for more information on the IC.
Configuring the Output Voltage (VOUT)
The EV kit comes standard with the fixed 3.3V output
version, but can easily be modified to evaluate the
adjustable-output version of the device or the 5V fixed
version.
To evaluate the 5V fixed output voltage version, replace
U1 with the MAX77596ETBA+ and leave the rest of the
board unchanged.
To evaluate the adjustable-output voltage version, replace
U1 with the MAX77596ETBC+ and remove the 0Ω
resistor on R4. The output voltage of the adjustable
version can be set between 1V and 10V by populating
resistors R3 and R4. Choose R3 to be less than or equal
to 100kΩ. Then calculate R4 for the desired VOUT with
the following equation:
R4 = R3 x [(VOUT/VFB) - 1]
where VFB = 1V.
The feed-forward capacitor (C8) is already installed
for use with the external feedback resistors and the
adjustable version of the IC. C8 is not required for the
fixed-output-voltage version. When evaluating other
versions of the device, the inductor, input capacitors, and
output capacitors might need to change. Refer to the
Applications Information section in the MAX77596 IC data
sheet for more information.
Enable Control
The EV kit uses jumper J1 to control the enable (EN)
input. Connect EN to VIN (SUP) by shunting pins 1-2 to
enable the device. Connect EN to GND by shunting pins
2-3 to disable the device. Table 1 summarizes the opera-
tion of J1.
Mode Control
The EV kit uses jumper J2 to configure the IC in either
forced-PWM (FPWM) mode or skip mode. Connect the
MODE pin to BIAS by installing a shunt in positions 1-2
on J2 to enable FPWM mode. Connect MODE to GND
by installing a shunt in positions 2-3 on J2 to enable skip
mode. Table 2 summarizes the operation of J2.
RESET Output
The EV kit provides a RESETB test point to monitor
the status of the RESET pin. RESET becomes high
impedance and is pulled to the BIAS voltage level through
resistor R1 after the regulator output increases above
92% of the nominal regulated voltage. RESET goes
low when the regulator output drops below 90% of the
nominal regulated voltage.
Table 1. Enable Control (J1) Table 2. Mode Control (J2)
SHUNT
POSITION EN PIN VOUT
1-2 Connected to VIN
(SUP) Enabled
2-3 Connected to GND
(PGND) Disabled
Not
installed
Connected to an
external source
Enabled with logic-high
Disabled with logic-low
SHUNT
POSITION MODE PIN MODE
1-2 Connected to BIAS Forced-PWM mode
2-3 Connected to GND Skip mode
Not
installed Floating Internally pulled down to
GND, skip mode
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Evaluates: MAX77596
MAX77596 Evaluation Kit
#Denotes RoHS compliant.
Note: Indicate that you are using the MAX77596 when contacting these component suppliers.
Component Suppliers
Ordering Information
PART TYPE
MAX77596EVKIT# EV Kit
SUPPLIER PHONE WEBSITE
Murata Americas 800-241-6574 www.murataamericas.com
TOKO, Inc. 847-297-0070 www.toko.co.jp
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Evaluates: MAX77596
MAX77596 Evaluation Kit
MAX77596 BOM
PART QTY DESCRIPTION
J1, J2 23-pin headers
R1 1100kΩ ±5% resistor (0402)
R3 0Not installed, resistor (0402)
R4 10Ω resistor (0402)
C7 022µF± 10%, 35V tantalum capacitor (7343),
not installed
U1 1MAX77596ETBB+ (10 TDFN-EP)
— 2 Shunts
— 1 PCB: MAX77596 EV KIT
4.7µF ±10%, 35V X5R ceramic capacitor (0603)
Murata GRM188R6YA475KE15D
1µF ±10%, 25V X5R ceramic capacitor (0603)
Murata GRM188R61A105KA61D
0.1µF ±10%, 10V X5R ceramic capacitor (0402)
Murata GRM155R61A104KA01D
22µF ±20%, 10V X5R ceramic capacitors (0603)
Murata GRM188R61A226ME15D
5.6pF ±20%, 50V X5R ceramic capacitor (0603)
Murata GRM1555C1H5R6BA01D
10µH ±30%, 1.4A inductor (2520)
TOKO DFE252012F-100M
C4–C6 3
C8 1
L1 1
C1 1
C2 1
C3 1
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Evaluates: MAX77596
MAX77596 Evaluation Kit
MAX77596 Schematics
35V
10V
35V
22UF
C7
DNI
C8
50V
0
5.6PF
10V10V10V
VOUT
GND2
21
R4
21
L1
C5C4 C6
10UH
22UF 22UF 22UF
1UF
C2
BIAS
RESETB
TP
6
5
8
1
10
11
3
7
9
4
2
U1
MAX77596ETBB+
J2
3
2
1
100K
R1
BIAS
BIAS
C1
4.7UF
0.1UF
C3
10V
J1
3
2
1
R3
OPEN
GND1
VIN
EP
EN
BIAS
LX
PGND
OUT/FB
RESET
BST
MODE
AGND
SUP
+
o «om-o MAX77596 EVKIT J1- VIN EN 6ND VIN 3 ca FPWM a 4 BIAS E4 I 3 MODEE 6ND I K GND 6 5 " SKIP H N @ :8 ca RESETB o z > o mummwmu m 1405750171000 am LB 05/15 arazaw K1
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Evaluates: MAX77596
MAX77596 Evaluation Kit
MAX77596 PCB Layout
SILKSCREEN TOP TOP
BOTTOM SILKSCREEN BOTTOM
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. © 2016 Maxim Integrated Products, Inc.
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Evaluates: MAX77596
MAX77596 Evaluation Kit
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 9/15 Initial release —
1 3/16 Updated General Description, Features, and Configuring the Output Voltage
(VOUT) sections 1, 2
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.