MAX17552 [MAXIM]
5V Output Voltage Applications;
| 型号： | MAX17552 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 5V Output Voltage Applications |
| 文件： | 总8页 (文件大小：712K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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Evaluates: MAX17552/MAX17552B (TDFN)
in 5V Output Voltage Applications
MAX17552 5V Output
Evaluation Kit (TDFN)
General Description
Quick Start
The MAX17552 5V evaluation kit (EV kit) (TDFN) is a fully
assembled and tested circuit board that demonstrates the
performance of the MAX17552 60V, 100mA ultra-small,
high-efficiency, synchronous step-down DC-DC converter
in a 10-pin TDFN package. The EV kit operates over a
wide input-voltage range of 6V to 60V and provides up
to 100mA load current at 5V output. It draws only 26µA
supply current under no-load conditions (EN/UVLO con-
Recommended Equipment
● MAX17552 5V EV kit (TDFN)
● 60V adjustable, 0.5A DC power supply
● Electronic load up to 100mA
● Voltmeter
Procedure
nected to V ). The EV kit is programmed to switch at a
IN
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.
frequency of 220kHz and delivers a peak efficiency of
93% with the supplied components. 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.
1) Verify that shunts are installed on jumpers JU1, JU2
(EN/UVLO).
2) Verify that jumper JU3 (MODE-PFM operation) is open.
The EV kit comes installed with the MAX17552ATB+ in
an 10-pin (3mm x 2mm) lead(Pb)-free/RoHS-compliant
TDFN package.
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.
Features and Benefits
● 6V to 60V Input Voltage Range
● 5V Output, 100mA Continuous Current
● 93% Peak Efficiency
5) Connect the voltmeter across the VOUT and GND
PCB pads.
6) Set the power-supply output to 24V. Disable the
power supply.
● 26µA No Load Supply Current
● EN/UVLO for On/Off Control and Programmable
7) Connect the power-supply output to the VIN PCB pad.
Connect the supply ground to the GND PCB pad.
Input Undervoltage Lockout
● 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
8) Turn on the power supply.
9) Enable the electronic load and verify that output volt-
age is 5V with respect to GND.
10) Vary the input voltage from 6V to 60V.
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 short-
circuited load, and thereby cause the absolute maximum
● Proven PCB Layout
● Fully Assembled and Tested
rating of the V
pin (-0.3V) to be exceeded. The
OUT
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
Ordering Information appears at end of data sheet.
TDFN is a registered trademark of Maxim Integrated Products, Inc.
maximum rating of the V
pin is not exceeded.
OUT
19-6905; Rev 2; 11/20
Evaluates: MAX17552/MAX17552B (TDFN)
in 5V Output Voltage Applications
MAX17552 5V Output
Evaluation Kit (TDFN)
RESET Output
Detailed Description
The EV kit provides a PCB pad to monitor the status of
the RESET output. RESET goes high and when the out-
put 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 MAX17552 5V EV kit (TDFN) is a fully assembled and
tested circuit board that demonstrates the performance of
the MAX17552 60V, 100mA ultra-small, high-efficiency,
synchronous step-down DC-DC converter in a 10-pin
TDFN package. The EV kit operates over a wide input
voltage range of 6V to 60V and provides up to 100mA
load current at 5V output. It draws only 26µA supply cur-
rent under no-load conditions (EN/UVLO connected to
VIN). The EV kit is programmed to switch at a frequency
of 220kHz and delivers a peak efficiency of 93% with the
supplied components. 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.
PFM or Forced-PWM Mode (MODE)
The EV kit includes a jumper (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
The EV kit offers a fixed 5ms soft-start time. Connect the
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. A
RESET PCB pad is available for monitoring the RESET
output. The RT/SYNC PCB pad can be used to synchro-
nize the EV kit switching frequency to an external clock
frequency.
capacitor C4 to adjust the soft-start time (t ). Use the
following equation to determine the soft-start capacitance
value (CSS).
SS
CSS = 6.25 x t
SS
where t is in milliseconds and C is in nanofarads.
SS
SS
External Synchronization (RT/SYNC)
The EV kit provides a PCB pad to synchronize the EV
kit switching frequency to an external clock frequency.
Apply the external clock to the RT/SYNC PCB pad
though an AC-coupling capacitor. Refer to the External
Synchronization section in the MAX17552 IC data sheet
for additional information on configuring the external
clock and selecting the AC-coupling capacitor.
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 undervolt-
age lockout (UVLO) threshold. Jumpers JU1 and JU2 con-
figure 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
MAX17552 IC data sheet for additional information on
setting the UVLO threshold voltage.
Table 1. Enable Control (EN/UVLO) (JU1, JU2)
SHUNT POSITION
EN/UVLO PIN
VOUT OUTPUT
JU1
1-2
JU2
Open
1-2
Connected to VIN
Connected to GND
Enabled
Disabled
Open
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
Connected to GND
Unconnected
MODE OF OPERATION
Forced PWM
PFM
1-2
Open*
*Default position.
Maxim Integrated
│ 2
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Evaluates: MAX17552/MAX17552B (TDFN)
in 5V Output Voltage Applications
MAX17552 5V Output
Evaluation Kit (TDFN)
EV Kit Performance Report
EFFICIENCY vs.
LOAD CURRENT
OUTPUT VOLTAGE
vs. LOAD CURRENT
EFFICIENCY vs.
LOAD CURRENT
toc1
toc2
toc3
100
90
100
90
80
70
60
50
40
30
20
10
0
5.08
5.05
5.02
4.99
4.96
80
VIN = 12V
VIN = 24V
VIN = 12V
VIN = 36V
70
60
50
40
30
20
10
0
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 48V, 60V
VIN = 24V
PWM MODE
PFM MODE
PFM MODE
80 100
1
10
100
0
20
40
60
80
100
0
20
40
60
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD TRANSIENT RESPONSE,
PFM MODE (LOAD CURRENT STEPPED
LOAD TRANSIENT RESPONSE
PFM OR PWM MODE (LOAD CURRENT
STEPPED FROM 50mA TO 100mtAoc)6
OUTPUT VOLTAGE
vs. LOAD CURRENT
FROM 5mA to 50mA)
toc5
toc4
4.994
4.992
4.99
VOUT
(AC)
VOUT
(AC)
100mV/div
100mV/div
VIN
12V
=
VIN = 24V
VIN = 48V
VIN = 36V
4.988
4.986
4.984
IOUT
50mA/div
VIN = 60V
IOUT
50mA/div
PWM MODE
80 100
0
20
40
60
200µs/div
100µs/div
LOAD CURRENT (mA)
LOAD TRANSIENT RESPONSE
PWM MODE (LOAD CURRENT STEPPED
SOFT-START
FROM NO LOAD TO 50mA)
toc7
toc8
BODE PLOT
toc9
5V/div
2V/div
VEN/UVLO
VOUT
(AC)
100mV/div
PHASE
GAIN
VOUT
50mA/div
5V/div
fCR = 8.5KHz,
PHASE MARGIN = 64°
IOUT
IOUT
50mA/div
VRESET
100µs/div
1ms/div
FREQUENCY
(Hz)
Maxim Integrated
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Evaluates: MAX17552/MAX17552B (TDFN)
in 5V Output Voltage Applications
MAX17552 5V Output
Evaluation Kit (TDFN)
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
3.01MΩ ±1% resistor (0402)
787kΩ ±1% resistor (0402)
191kΩ ±1% resistor (0402)
261kΩ ±1% resistor (0402)
49.9kΩ ±1% resistor (0402)
100kΩ ±1% resistor (0402)
22.1Ω ±1% resistor (0402)
R1
R2
R3
R4
R5
R6
R7
1
1
1
1
1
1
1
22µF, 100V electrolytic capacitor
(8.3mm x 8.3mm)
Panasonic EEVFK2A220P
C1
C2
1
1
1µF ±10%, 100V X7R ceramic
capacitor (1206)
Murata GRM31CR72A105K
10µF ±10%, 6.3V X7R ceramic
capacitor (1206)
Murata GRM31CR70J106K
C3
C4
C5
1
0
1
60V, 100mA, ultra-small, high-
efficiency, synchronous step-down
DC-DC converter with 22µA no-
load supply current (10 TDFN-EP*)
Maxim MAX17552ATB+
Not installed, ceramic capacitor
U1
1
0.22uF ±10%, 16V X7R ceramic
capacitor (0402)
Murata GRM155R71C224K
—
—
3
1
Shunts
JU1–JU3
L1
3
1
2-pin headers
PCB: MAX17552ATB-5V
EVALUATION KIT
220µH, 235mA inductor
Coilcraft, Inc. LPS5030-224ML
Component Suppliers
SUPPLIER
Coilcraft, Inc.
PHONE
WEBSITE
847-639-6400
770-436-1300
800-344-2112
www.coilcraft.com
Murata Americas
www.murataamericas.com
www.panasonic.com
Panasonic Corp.
Note: Indicate that you are using the MAX17552ATB when contacting these component suppliers.
Maxim Integrated
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Evaluates: MAX17552/MAX17552B (TDFN)
in 5V Output Voltage Applications
MAX17552 5V Output
Evaluation Kit (TDFN)
MAX17552 5V EV Kit (TDFN) Schematic
U1
MAX17552ATB
VOUT
VIN
6V TO 60V
VOUT
5V,100MA
L1
220UH
1
10
1
2
VIN
LX
C3
10UF
6.3V
C2
1UF
C1
22UF
R1
3.01M
100V
9
6
GND
100V
GND
GND
R7
22.1
2
EN/UVLO
VOUT
C5
0.22UF
RT/SYNC
R4
261K
JU1
R5
3
4
EN/UVLO
GND
RT/SYNC
SS
5
7
R3
191K
FB
49.9K
C4
OPEN
MODE
RESET
JU2
8
MODE
EP
RESET
VOUT
R6
JU3
R2
787K
100K
Maxim Integrated
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Evaluates: MAX17552/MAX17552B (TDFN)
in 5V Output Voltage Applications
MAX17552 5V Output
Evaluation Kit (TDFN)
MAX17552 5V EV Kit (TDFN) PCB Layout
MAX17552 5V EV Kit (TDFN) PCB Layout—Component Side
MAX17552 5V EV Kit (TDFN) Component Placement Guide—
Component Side
MAX17552 5V EV Kit (TDFN) PCB Layout—Solder Side
Maxim Integrated
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Evaluates: MAX17552/MAX17552B (TDFN)
in 5V Output Voltage Applications
MAX17552 5V Output
Evaluation Kit (TDFN)
Ordering Information
PART
TYPE
MAX17552ATBEVKIT#
#Denotes RoHS compliance.
EV Kit
Maxim Integrated
│ 7
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Evaluates: MAX17552/MAX17552B (TDFN)
in 5V Output Voltage Applications
MAX17552 5V Output
Evaluation Kit (TDFN)
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
DESCRIPTION
CHANGED
0
1
2
1/14
4/14
Initial release
—
Updated Ordering Information table
7
11/20
Updated the General Description and the title
1‒8
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
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.
2014 Maxim Integrated Products, Inc.
│ 8
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