MAX17644C [MAXIM]
MAX17644 in 3.3V and 5V Output-Voltage Applications;
| 型号： | MAX17644C |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | MAX17644 in 3.3V and 5V Output-Voltage Applications |
| 文件： | 总19页 (文件大小：1216K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
General Description
The MAX17644 evaluation kit (comprising the
Features
● Wide 4.5V to 36V Input Voltage Range
MAX17644AEVKIT#,
MAX17644BEVKIT#,
and
● MAX17644AEVKIT# Offers High 87.28% Efficiency
MAX17644C5EVKIT# EV kits) provides proven designs to
evaluate the MAX17644A, MAX17644B, and MAX17644C
high-efficiency, high-voltage Himalaya synchronous
DC-DC converters.
(V
= 24V, V
= 3.3V, I
= 2.7A)
IN1
OUT1
OUT1
● MAX17644BEVKIT# Offers High 90.77% Efficiency
(V = 24V, V = 5V, I = 2.7A)
IN2
OUT2
OUT2
● MAX17644C5EVKIT# Offers High 90.77% Efficiency
(V = 24V, V = 5V, I = 2.7A)
The MAX17644AEVKIT# EV kit delivers up to 2.7A, with
IN3
OUT3
OUT3
a fixed 3.3V output (V
operate at 500kHz (f
). The EV kit is configured to
) switching frequency over a
OUT1
SW1
● Enable/UVLO Input, Resistor-Programmable UVLO
Threshold
4.5V to 36V input voltage range.
● Selectable PWM, PFM, and DCM Modes of
The MAX17644BEVKIT# EV kit delivers up to 2.7A, with a
Operation
fixed 5V output (V ). The EV kit is configured to oper-
OUT2
ate at 500kHz (f
36V input voltage range.
) switching frequency over a 6.5V to
SW2
● Adjustable Soft-Start Time
●
RESET Outputs, with Pullup Resistor to Respective
CC
The MAX17644C5EVKIT# EV kit delivers up to 2.7A, with
a configured 5V output (V
figured to operate at 500kHz (f
over a 6.5V to 36V input voltage range.
V
). The EV kit is also con-
OUT3
● Provision to Synchronize the Converters to an
External Clock Source
) switching frequency
SW3
● Overcurrent and Overtemperature Protection
● Proven PCB Layout
The EV kits are configured to demonstrate the optimum
performance and component size. The EV kits pro-
vide provisions for enable/disable settings and selecting
the modes of operation (pulse-width modulation/pulse-
frequency modulation/discontinuous-conduction mode
[PWM/PFM/DCM]). The EV kits feature programmable
input undervoltage-lockout (UVLO), adjustable soft-start,
open-drain RESET signal, and external clock synchroni-
zation. The EV kits also provide a good layout example,
which is optimized for conducted, radiated EMI, and ther-
mal performance. For more details, refer to the Benefits
and Features section in the MAX17644 IC data sheet.
● Fully Assembled and Tested
● Complies with CISPR32 (EN55032) Class B
Conducted and Radiated Emissions
Ordering Information appears at end of data sheet.
319-100722; Rev 0; 3/21
Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
11) Verify that the DMM across the output terminals
displays 3.3V for MAX17644AEVKIT#, 5V for
MAX17644BEVKIT# and MAX17644C5EVKIT#.
Quick Start
Recommended Equipment
●
MAX17644AEVKIT#, MAX17644BEVKIT#, MAX-
17644C5EVKIT#
12) Verify that the DMM across the RESET PCB pad and
SGND PCB displays 5V.
●
●
●
36V, 3A power supply
13) Reduce the input voltage to 3.6V for MAX17644AE-
VKIT# and to 5.3V for MAX17644AEVKIT# and
MAX17644C5EVKIT# which are below the EN/UVLO
falling thresholds.
Load capable of sinking 2.7A at 3.3V and 5V
Two digital multimeters (DMM)
Equipment Setup and Test Procedure
The EV kits are fully assembled and tested. Follow the
steps below to verify the individual board operation:
14) Verify that both the DMMs display 0V.
15) Disable the input power supply.
Caution: Do not turn on power supply until all con-
nections are completed.
Detailed Description of Hardware
The MAX17644AEVKIT#, MAX17644BEVKIT#, and
MAX17644C5EVKIT#EVkitsaredesignedtodemonstrate
the salient features of the MAX17644A, MAX17644B, and
MAX17644C converter ICs, respectively. All the three cir-
cuits are electrically isolated from each other and hosted
on the same PCB. Each of the converter ICs can be eval-
uated by powering them from their respective input pins.
Individual device settings can be adjusted to evaluate
their performance under different operating conditions.
1) Set the input power supply voltage at 3.9V for
MAX17644AEVKIT# and at 5.9V for MAX17644BEV-
KIT# and MAX17644C5EVKIT#. Disable the power
supply.
2) Connect the positive terminal of the power supply to
the VIN PCB pad and the negative terminal to the
nearest PGND PCB pad.
3) Connect the positive terminal of the corresponding
load to the respective VOUT PCB pad and the nega-
tive terminal to the nearest PGND PCB pad.
Soft-Start Input (SS)
The EV kits offer an adjustable soft-start function to limit
inrush current during the startup. The soft-start time is
4) Connect one DMM across respective VOUT PCB
pad and the nearest PGND PCB pad, and another
DMM across the respective RESET PCB pad and
the SGND PCB pad.
adjusted by the value of external soft-start capacitors C
SS
connected between SS and SGND. The selected output
capacitance (C ) and the output voltage (V ) deter-
SEL
OUT
mine the minimum value of C
shown in the following equation:
(C106, C206, C306) as
SS
5) Verify that no shunts are installed on jumpers
(JU101, JU201, JU301). See Table 1 for details.
−6
6) Select the shunt position on respective jumpers
(JU102, JU202, JU302) according to the intended
mode of operation. See Table 2 for details.
C
≥ 28×10 × C
× V
SEL OUT
SS
The soft-start time (t ) is related to soft-start capacitor
SS
C
by the following equation:
SS
7) Turn on the input power supply.
8) Enable the load.
C
SS
t
=
SS
−6
9) Observe that both the DMMs display 0V.
5.55×10
10) Increase the input voltage to 4.5V or higher for
MAX17644AEVKIT# and to 6.5V or higher for
MAX17644BEVKIT# and MAX17644C5EVKIT#
which are above the EN/UVLO rising thresholds.
For example, to program a 1ms soft-start time, C
should be 5600pF.
SS
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Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
Choose R
to be 3.32MΩ and then calculate
as follows:
Enable/Undervoltage Lockout Programming
UVL_TOP
R
UVL_BOT
The MAX17644A, MAX17644B, and MAX17644C offer
an enable and adjustable input undervoltage lockout (EN/
UVLO) feature. In the EV kits, for normal operation, leave
the jumpers (JU101, JU201, JU301) open. When jump-
ers are left open, MAX17644A is enabled when the input
voltage rises above 4.4V and MAX17644B, MAX17644C
are enabled when the input voltage rises above 6.4V. To
disable the converters, install shunts across pin 2-3 on
jumpers (JU101, JU201, JU301). See Table 1 for jumper
(JU101, JU201, JU301) settings. The EN/UVLO PCB
pads on the EV kits support external Enable/Disable con-
trol of the device. Leave jumpers (JU101, JU201, JU301)
open when external Enable/Disable control is desired.
R
×1.215
UVL_TOP
R
=
UVL_BOT
V
−1.215
(
)
INU
where R
is in MΩ. For more details about setting
UVL_BOT
the undervoltage lockout level, refer to the MAX17644 IC
data sheet.
Mode Selection (MODE/SYNC)
The EV kits provide jumpers (JU102, JU202, JU302) that
allow the converters to operate in PWM, PFM, and DCM
modes. For more details on the modes of operation, refer
to the MAX17644 data sheet. Table 2 shows the mode
selection jumper (JU102, JU202, JU302) settings that
can be used to configure the desired mode of operation
for each converter.
A potential divider formed by resistors R
(R101,
UVL_TOP
R201, R301) and R
(R102, R202, R302) sets the
UVL_BOT
input voltage (V
) above which the converter is enabled
INU
when jumpers (JU101, JU201, JU301) are left open.
Table 1. Converter EN/UVLO Jumper (JU101, JU201, and JU301) Settings
SHUNT POSITION
EN/UVLO PIN
OUTPUT
1-2
Connected to V
Enabled
IN
Connected to center node of respective
resistive dividers (R101 and R102, R201 and R202,
R301 and R302)
Enabled, UVLO level is set by the resistor-
Not installed*
divider between V and SGND
IN
2-3
Connected to SGND
Disabled
*Default position.
Table 2. Mode Selection Jumper (JU102, JU202, and JU302) Settings
SHUNT POSITION
MODE/SYNC PIN
MODE
1-2
2-3
Connected to V
DCM mode of operation
PWM mode of operation
PFM mode of operation
CC
Connected to SGND
Unconnected
Not installed*
*Default position.
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Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
Hot Plugged to the EV kit input terminals with long input
cables. The equivalent series resistance (ESR) of the
electrolytic capacitor dampens the oscillations caused by
interaction of the inductance of the long input cables and
the ceramic capacitors at the converters’ input.
External Clock Synchronization
(MODE/SYNC)
The EV kits provide MODE/SYNC PCB pads to synchro-
nize the MAX17644A, MAX17644B, and MAX17644C to
an optional external clock. Leave jumpers (JU102, JU202,
JU302) open when external clock signals are applied. In
the presence of a valid external clock for synchronization,
the MAX17644A, MAX17644B, and MAX17644C operate
in PWM mode only. For more details about external clock
synchronization, refer to the MAX17644 IC data sheet.
Electromagnetic Interference
Compliance to conducted emission (CE) standards
requires an electromagnetic interference (EMI) filter at
the input of a switching power converter. The EMI filter
attenuates high-frequency currents drawn by the switch-
ing power converter and limits the noise injected back into
the input power source.
Active-Low, Open-Drain Reset Output
(RESET)
The EV kits provide RESET PCB pads to monitor the sta-
tus of the converters. RESET goes high when VOUT rises
above 95% (typ) of its nominal regulated output voltage.
RESET goes low when VOUT falls below 92% (typ) of its
nominal regulated voltage.
The MAX17644AEVKIT#, MAX17644BEVKIT#, and
MAX17644C5EVKIT# PCBs have designated footprints
for the placement of conducted EMI filter components
as per the optional bill of material (BOM). Use of these
filter components results in lower conducted EMI below
CISPR32 Class B limits. Cut open the trace at L102,
L202, and L302 before installing conducted EMI filter
components. The PCB layouts are also designed to limit
radiated emissions from switching nodes of the power
converter resulting in radiated emissions below CISPR32
Class B limits.
Hot Plug-In and Long Input Cables
The MAX17644AEVKIT#, MAX17644BEVKIT#, and
MAX17644C5EVKIT# EV kit PCB layouts provide an
optional electrolytic capacitor (C101, C201, C301 =
47µF/50V). These capacitors limit the peak voltage at
the input of the converters when the DC input source is
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Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
EV Kits Performance Report
(V
= V
= V
= 24V, f
= f
= f
= 500kHz, T = +25°C, unless otherwise noted)
IN1
IN2
IN3
SW1
SW2
SW3
A
MAX17644A, VOUT1 = 3.3V
EFFICIENCY VS. LOAD CURRENT
MAX17644A, VOUT1 = 3.3V
EFFICIENCY VS. LOAD CURRENT
MAX17644A, VOUT1 = 3.3V
EFFICIENCY VS. LOAD CURRENT
toc02
toc01
toc03
100
80
60
40
20
100
100
90
80
70
60
80
60
40
20
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 4.5V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 4.5V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 4.5V
2.70
2.70
2.70
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
LOAD CURRENT (A)
2.70
0.01
0.01
0.01
0.10
1.00
0.01
0.01
0.01
0.10
1.00
LOAD CURRENT (A)
CONDITIONS: PFM MODE
LOAD CURRENT (A)
CONDITIONS: PWM MODE
CONDITIONS: DCM MODE
MAX17644B, VOUT2 = 5V
EFFICIENCY VS. LOAD CURRENT
MAX17644B, VOUT2 = 5V
EFFICIENCY VS. LOAD CURRENT
MAX17644B, VOUT2 = 5V
EFFICIENCY VS. LOAD CURRENT
toc04
toc05
toc06
100
80
100
80
100
95
90
85
80
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 36V
VIN = 24V
VIN = 6.5V
VIN = 12V
60
60
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 6.5V
VIN = 6.5V
40
40
2.70
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
LOAD CURRENT (A)
0.10
1.00
0.10
1.00
LOAD CURRENT (A)
CONDITIONS: DCM MODE
LOAD CURRENT (A)
CONDITIONS: PWM MODE
CONDITIONS: PFM MODE
MAX17644C, VOUT3 = 5V
EFFICIENCY VS. LOAD CURRENT
MAX17644C, VOUT3 = 5V
EFFICIENCY VS. LOAD CURRENT
MAX17644C, VOUT3 = 5V
EFFICIENCY VS. LOAD CURRENT
toc07
toc08
toc09
100
80
100
80
100
95
90
85
80
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 36V
VIN = 24V
VIN = 6.5V
VIN = 12V
60
60
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 6.5V
VIN = 6.5V
40
40
2.70
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
LOAD CURRENT (A)
0.10
1.00
0.10
1.00
LOAD CURRENT (A)
LOAD CURRENT (A)
CONDITIONS: PFM MODE
CONDITIONS: PWM MODE
CONDITIONS: DCM MODE
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Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
EV Kits Performance Report (continued)
(V
= V
= V
= 24V, f
= f
= f
= 500kHz, T = +25°C, unless otherwise noted)
IN1
IN2
IN3
SW1
SW2
SW3
A
MAX17644A, VOUT1 = 3.3V
LOAD AND LINE REGULATION,
MAX17644A, VOUT1 = 3.3V
LOAD AND LINE REGULATION
MAX17644A, VOUT1 = 3.3V
LOAD AND LINE REGULATION
toc10
toc11
toc12
3.33
3.33
3.32
3.31
3.30
3.29
3.28
3.27
3.45
3.40
3.35
3.30
3.25
3.32
3.31
3.30
3.29
3.28
3.27
VIN = 4.5V
VIN = 24V
VIN = 12V
VIN = 12V
VIN = 4.5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 4.5V
VIN = 36V
VIN = 24V
VIN = 36V
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
LOAD CURRENT (A)
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
LOAD CURRENT (A)
LOAD CURRENT (A)
CONDITIONS: PWM MODE
CONDITIONS: PFM MODE
CONDITIONS: DCM MODE
MAX17644B, VOUT2 = 5V
MAX17644B, VOUT2 = 5V
MAX17644B, VOUT2 = 5V
LOAD AND LINE REGULATION
LOAD AND LINE REGULATION
LOAD AND LINE REGULATION
toc13
toc14
toc15
5.02
5.01
5.00
4.99
4.98
4.97
4.96
5.02
5.01
5.00
4.99
4.98
4.97
4.96
5.15
5.10
5.05
5.00
4.95
VIN = 6.5V
VIN = 24V
VIN = 6.5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 6.5V
VIN = 24V
VIN = 12V
VIN = 36V
VIN =12V
VIN = 36V
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
LOAD CURRENT (A)
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
LOAD CURRENT (A)
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
LOAD CURRENT (A)
CONDITIONS: DCM MODE
CONDITIONS: PFM MODE
CONDITIONS: PWM MODE
MAX17644C, VOUT3 = 5V
LOAD AND LINE REGULATION
MAX17644C, VOUT3 = 5V
LOAD AND LINE REGULATION
MAX17644C, VOUT3 = 5V
LOAD AND LINE REGULATION
toc17
toc16
toc18
5.02
5.01
5.00
4.99
4.98
4.97
4.96
5.02
5.01
5.00
4.99
4.98
4.97
4.96
5.15
5.10
5.05
5.00
4.95
VIN = 6.5V
VIN = 24V
VIN = 6.5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 6.5V
VIN = 24V
VIN = 12V
VIN = 36V
VIN =12V
VIN = 36V
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
LOAD CURRENT (A)
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
LOAD CURRENT (A)
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
LOAD CURRENT (A)
CONDITIONS: PFM MODE
CONDITIONS: PWM MODE
CONDITIONS: DCM MODE
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Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
EV Kits Performance Report (continued)
(V
= V
= V
= 24V, f
= f
= f
= 500kHz, T = +25°C, unless otherwise noted)
IN1
IN2
IN3
SW1
SW2
SW3
A
MAX17644B, VOUT2 = 5V
SOFT-START/SHUTDOWN THROUGH EN/UVLO
MAX17644A, VOUT1 = 3.3V
SOFT-START/SHUTDOWN THROUGH EN/UVLO
MAX17644A, VOUT1 = 3.3V
SOFT-START/SHUTDOWN WITH PREBIAS VOLTAGE OF 1.65V
toc19
toc21
toc20
VEN/UVLO
VEN/UVLO
5V/div
VEN/UVLO
5V/div
5V/div
3.3V
1.65V
VOUT
2V/div
VOUT
ILX
2V/div
1A/div
VOUT
ILX
2V/div
2A/div
5V/div
ILX
2A/div
5V/div
VRESET
VRESET
VRESET
5V/div
1ms/div
1ms/div
1ms/div
CONDITIONS: 1.22Ω RESISTIVE LOAD
CONDITIONS: PWM MODE, 61Ω RESISTIVE LOAD
CONDITIONS: 1.85Ω RESISTIVE LOAD
MAX17644B, VOUT2 = 5V
MAX17644C, VOUT3 = 5V
MAX17644C, VOUT3 = 5V
SOFT-START/SHUTDOWN WITH PREBIAS VOLTAGE OF 2.5V
SOFT-START/SHUTDOWN THROUGH EN/UVLO
SOFT-START/SHUTDOWN WITH PREBIAS VOLTAGE OF 2.5V
toc22
toc23
toc24
VEN/UVLO
5V/div
5V
VEN/UVLO
VEN/UVLO
5V/div
5V/div
5V
2.5V
2.5V
VOUT
VOUT
VOUT
ILX
2V/div
1A/div
2V/div
2V/div
2A/div
5V/div
ILX
ILX
1A/div
VRESET
VRESET
VRESET
5V/div
5V/div
1ms/div
1ms/div
1ms/div
CONDITIONS: 1.85Ω RESISTIVE LOAD
CONDITIONS: PWM MODE, 92Ω RESISTIVE LOAD
CONDITIONS: PWM MODE, 92Ω RESISTIVE LOAD
MAX17644A, VOUT1 = 3.3V
STEADY STATE PERFORMANCE
MAX17644A, VOUT1 = 3.3V
STEADY STATE PERFORMANCE
MAX17644A, VOUT1 = 3.3V
STEADY STATE PERFORMANCE
toc25
toc26
toc27
VOUT(AC)
20mV/div
VOUT(AC)
20mV/div
20V/div
VOUT(AC)
50mV/div
VLX
20V/div
2A/div
VLX
VLX
20V/div
1A/div
ILX
ILX
ILX
500mA/div
2µs/div
CONDITIONS: PWM MODE, 2.7A LOAD
2µs/div
CONDITIONS: DCM MODE, 54mA LOAD
20µs/div
CONDITIONS: PFM MODE, 54mA LOAD
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Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
EV Kits Performance Report (continued)
(V
= V
= V
= 24V, f
= f
= f
= 500kHz, T = +25°C, unless otherwise noted)
IN1
IN2
IN3
SW1
SW2
SW3
A
MAX17644B, VOUT2 = 5V
MAX17644B, VOUT2 = 5V
MAX17644B, VOUT2 = 5V
STEADY STATE PERFORMANCE
STEADY STATE PERFORMANCE
STEADY STATE PERFORMANCE
toc28
toc29
toc30
VOUT(AC)
20mV/div
20V/div
2A/div
VOUT(AC)
20mV/div
20V/div
VOUT(AC)
50mV/div
20V/div
VLX
VLX
VLX
ILX
ILX
ILX
500mA/div
1A/div
2µs/div
CONDITIONS: PWM MODE, 2.7A LOAD
2µs/div
20µs/div
CONDITIONS: PFM MODE, 54mA LOAD
CONDITIONS: DCM MODE, 54mA LOAD
MAX17644C, VOUT3 = 5V
MAX17644C, VOUT3 = 5V
MAX17644C, VOUT3 = 5V
STEADY STATE PERFORMANCE
STEADY STATE PERFORMANCE
STEADY STATE PERFORMANCE
toc31
toc32
toc33
VOUT(AC)
VOUT(AC)
20mV/div
20V/div
20mV/div
20V/div
2A/div
VOUT(AC)
50mV/div
20V/div
VLX
VLX
VLX
ILX
ILX
500mA/div
1A/div
ILX
2µs/div
20µs/div
2µs/div
CONDITIONS: PFM MODE, 54mA LOAD
CONDITIONS: DCM MODE, 54mA LOAD
CONDITIONS: PWM MODE, 2.7A LOAD
MAX17644A, VOUT1 = 3.3V
MAX17644A, VOUT1 = 3.3V
MAX17644A, VOUT1 = 3.3V
LOAD TRANSIENT BETWEEN 0 AND 1A
LOAD TRANSIENT BETWEEN 1.7A AND 2.7A
LOAD TRANSIENT BETWEEN 0.054A AND 1A
toc34
toc35
toc36
VOUT(AC)
VOUT(AC)
VOUT(AC)
100mV/div
100mV/div
100mV/div
2.7A
1.7A
IOUT
IOUT
IOUT
1A/div
500mA/div
500mA/div
200µs/div
100µs/div
100µs/div
CONDITIONS: PWM MODE
CONDITIONS: PWM MODE
CONDITIONS: DCM MODE
Maxim Integrated
│ 8
www.maximintegrated.com
Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
EV Kits Performance Report (continued)
(V
= V
= V
= 24V, f
= f
= f
= 500kHz, T = +25°C, unless otherwise noted)
IN1
IN2
IN3
SW1
SW2
SW3
A
MAX17644A, VOUT1 = 3.3V
LOAD TRANSIENT BETWEEN 0.054A AND 1A,
MAX17644B, VOUT2 = 5V
LOAD TRANSIENT BETWEEN 0 AND 1A
MAX17644B, VOUT2 = 5V
LOAD TRANSIENT BETWEEN 1.7A AND 2.7A
toc37
toc38
toc39
VOUT(AC)
100mV/div
VOUT(AC)
VOUT(AC)
100mV/div
100mV/div
2.7A
1.7A
IOUT
IOUT
IOUT
1A/div
500mA/div
1A/div
100µs/div
200µs/div
100µs/div
CONDITIONS: PWM MODE
CONDITIONS: PFM MODE
CONDITIONS: PWM MODE
MAX17644B, VOUT2 = 5V
LOAD TRANSIENT BETWEEN 0.054A AND 1A
MAX17644B, VOUT2 = 5V
LOAD TRANSIENT BETWEEN 0.054A AND 1A
MAX17644C, VOUT3 = 5V
LOAD TRANSIENT BETWEEN 0 AND 1A
toc42
toc40
toc41
VOUT(AC)
VOUT(AC)
100mV/div
100mV/div
VOUT(AC)
100mV/div
IOUT
IOUT
IOUT
1A/div
1A/div
1A/div
200µs/div
100µs/div
100µs/div
CONDITIONS: PFM MODE
CONDITIONS: DCM MODE
CONDITIONS: PWM MODE
MAX17644C, VOUT3 = 5V
LOAD TRANSIENT BETWEEN 0.054A AND 1A
MAX17644C, VOUT3 = 5V
LOAD TRANSIENT BETWEEN 0.054A AND 1A
MAX17644C, VOUT3 = 5V
LOAD TRANSIENT BETWEEN 1.7A AND 2.7A
toc44
toc43
toc45
VOUT(AC)
VOUT(AC)
100mV/div
100mV/div
VOUT(AC)
100mV/div
2.7A
1.7A
IOUT
IOUT
1A/div
IOUT
1A/div
1A/div
100µs/div
200µs/div
100µs/div
CONDITIONS: PWM MODE
CONDITIONS: DCM MODE
CONDITIONS: PFM MODE
Maxim Integrated
│ 9
www.maximintegrated.com
Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
EV Kits Performance Report (continued)
(V
= V
= V
= 24V, f
= f
= f
= 500kHz, T = +25°C, unless otherwise noted)
IN1
IN2
IN3
SW1
SW2
SW3
A
MAX17644A, VOUT1 = 3.3V
OVERLOAD PROTECTION
MAX17644B, VOUT2 = 5V
OVERLOAD PROTECTION
MAX17644C, VOUT3 = 5V
OVERLOAD PROTECTION
toc46
toc47
toc48
VOUT
VOUT
VOUT
500mV/div
500mV/div
500mV/div
ILX
ILX
ILX
2A/div
2A/div
2A/div
20ms/div
20ms/div
20ms/div
CONDITIONS: 0.2Ω RESISTIVE LOAD
CONDITIONS: 0.2Ω RESISTIVE LOAD
CONDITIONS: 0.2Ω RESISTIVE LOAD
MAX17644A, VOUT1 = 3.3V
MAX17644B, VOUT2 = 5V
EXTERNAL CLOCK SYNCHRONIZATION
EXTERNAL CLOCK SYNCHRONIZATION
toc49
toc50
VSYNC
VSYNC
VOUT(AC)
5V/div
5V/div
VOUT(AC)
50mV/div
50mV/div
VLX
VLX
20V/div
2A/div
20V/div
2A/div
ILX
ILX
4µs/div
4µs/div
CONDITIONS: 2.7A LOAD CURRENT
EXTERNAL CLOCK FREQUENCY = 550kHz
CONDITIONS: 2.7A LOAD CURRENT
EXTERNAL CLOCK FREQUENCY = 550kHz
MAX17644C, VOUT3 = 5V
EXTERNAL CLOCK SYNCHRONIZATION
toc51
MAX17644A, VOUT1 = 3.3V
BODE PLOT
toc52
40
30
160
120
80
PHASE
VSYNC
5V/div
20
VOUT(AC)
50mV/div
10
40
0
0
VLX
GAIN
20V/div
2A/div
-10
-20
-30
-40
-40
-80
-120
-160
GAIN CROSSOVER
ILX
FREQUENCY = 65.33kHz
PHASE MARGIN = 58.72°
4µs/div
1k
10k
100k
CONDITIONS: 2.7A LOAD CURRENT
EXTERNAL CLOCK FREQUENCY = 550kHz
FREQUENCY (Hz)
CONDITIONS: 1.22Ω RESISTIVE LOAD
Maxim Integrated
│ 10
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Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
EV Kits Performance Report (continued)
(V
= V
= V
= 24V, f
= f
= f
= 500kHz, T = +25°C, unless otherwise noted)
IN1
IN2
IN3
SW1
SW2
SW3 A
MAX17644B, VOUT2 = 5V
BODE PLOT
MAX17644C, VOUT3 = 5V
BODE PLOT
toc53
toc54
40
30
20
10
0
160
120
80
40
30
160
120
80
PHASE
PHASE
20
40
10
40
0
0
0
GAIN
GAIN
-10
-20
-30
-40
-80
-120
-160
-10
-20
-30
-40
-40
-80
-120
-160
GAIN CROSSOVER
GAIN CROSSOVER
FREQUENCY = 62.13kHz
FREQUENCY = 49.54kHz
PHASE MARGIN = 67.57°
PHASE MARGIN = 71.43°
-40
1k
10k
100k
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
CONDITIONS: 1.85Ω RESISTIVE LOAD
CONDITIONS: 1.85Ω RESISTIVE LOAD
MAX17644C, VOUT3 = 5V, 2.7A LOAD CURRENT
CONDUCTED EMISSIONS CURVE
RADIATED EMISSIONS CURVE
toc55
toc56
80
0
0
0
70
60
70
60
CISPR32 CLASS B QP LIMIT
CISPR32 CLASS B AVG LIMIT
500
40
50
40
0
CISPR32 CLASS B QP LIMIT
VERTICAL SCAN
30 0
PEAK
EMISSIONS
30
20
10
0
20
10 0
0
0
HORIZONTAL SCAN
AVERAGE EMISSIONS
0
-10 0
30
1
10
0.15
FREQUENCY (MHz)
MEASURED ON MAX17644C5EVKIT# with
L302 = 15µH, C315 = C316 = C317 = 4.7µF/50V/1206/X7R
1000
30
100
FREQUENCY (MHz)
MEASURED ON MAX17644C5EVKIT#
Component Suppliers
Ordering Information
SUPPLIER
WEBSITE
PART
TYPE
Coilcraft
www.coilcraft.com
www.murata.com
www.panasonic.com
www.tdk.com
MAX17644AEVKIT#
MAX17644BEVKIT#
MAX17644C5EVKIT#
#Denotes RoHS compliance.
EV Kit
EV Kit
EV Kit
Murata Americas
Panasonic
TDK corp.
SullinsCorp
www.sullinscorp.com
Note: Indicate that you are using the MAX17644A/MAX17644B/
MAX17644C when contacting these component suppliers.
Maxim Integrated
│ 11
www.maximintegrated.com
Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
MAX17644 EV Kit Bill of Materials
S.No
DESIGNATOR
DESCRIPTION
QUANITITY
MANUFACTURER PART NUMBER
PANASONIC EEE-TG1H470UP
MURATA GRM31CR71H475KA12
MURATA GRM188R72A104KA35
TDK C1005C0G2A151J050BA
MURATA GRM188R71A225KE15
MURATA GRM155R71E562KA01
TDK C1005X7R1C104K050BC
MURATA GRM32ER71A476KE15
TDK C3225X7R1C226M250AC
SULLINS PEC03SAAN
1
C101, C201, C301
47µF; 20%; 50V; Electrolytic Capacitor
4.7µF±10%; 50V; X7R; Ceramic Capacitor (1206)
0.1µF±10%; 100V; X7R; Ceramic Capacitor (0603)
150pF±5%; 100V; C0G; Ceramic Capacitor (0402)
2.2µF±10%; 10V; X7R; Ceramic Capacitor (0603)
5600pF±10%; 25V; X7R; Ceramic Capacitor (0402)
0.1µF±10%; 16V; X7R; Ceramic Capacitor (0402)
47µF±10%; 10V; X7R; Ceramic Capacitor (1210)
22µF±20%; 16V; X7R; Ceramic Capacitor (1210)
3-pin Header (2.54mm)
3
3
6
6
3
3
6
1
2
6
1
2
3
1
3
3
5
2
1
1
6
2
C102, C202, C302
3
C103, C113, C203, C213, C303, C313
C104, C112, C204, C212, C304, C312
C105, C205, C305
4
5
6
C106, C206, C306
7
C107, C110, C207, C210, C307, C310
C108
8
9
C208, C308
10
11
12
13
14
15
16
17
18
19
20
21
JU101, JU102, JU201, JU202, JU301, JU302
L101
5.6µH±20%; IRMS = 7.2A; Inductor (5.3mmx5.5mm)
8.2µH±20%; IRMS = 4.5A; Inductor (5.3mmx5.5mm)
3.32MΩ ±1%; 0.063W, Resistor (0402)
1.37MΩ±1%; 0.063W, Resistor (0402)
40.2kΩ±1%; 0.063W, Resistor (0402)
COILCRAFT XAL5050-562ME
COILCRAFT XAL5050-822ME
L201, L301
R101, R201, R301
R102
R103, R203, R303
R104, R204, R304
10kΩ±1%; 0.063W, Resistor (0402)
R105, R107, R206, R207, R306
R202, R302
0; Jumper; 0.1W, Resistor (0402)
825kΩ±1%; 0.063W, Resistor (0402)
R307
200kΩ±1%; 0.063W, Resistor (0402)
R308
44.2kΩ±1%; 0.1W, Resistor (0402)
SU101, SU102, SU201, SU202, SU301, SU302
Jumper Socket (2.54mm)
SULLINS STC02SYAN
High-Efficiency, Synchronous Step-Down DC-DC Converter (16
22
23
24
U101
U201
U301
1
1
1
MAXIM INTEGRATED MAX17644AATE+
Pin TQFN, 3mmx3mm)
High-Efficiency, Synchronous Step-Down DC-DC Converter (16
MAXIM INTEGRATED MAX17644BATE+
MAXIM INTEGRATED MAX17644CATE+
Pin TQFN, 3mmx3mm)
High-Efficiency, Synchronous Step-Down DC-DC Converter (16
Pin TQFN, 3mmx3mm)
25
26
27
28
29
30
31
C315-C317
L302
Optional: 4.7µF±10%; 50V; X7R; Ceramic Capacitor (1206)
Optional: 15μH±20%; IRMS = 2.2A, Inductor (4mm x 4mm)
Open: Capacitor (1210)
3
1
0
0
0
0
0
MURATA GRM31CR71H475KA12
COILCRAFT XAL4040-153ME
C115-C117, C215-C217
L102, L202
Open: Inductor (4mmx4mm)
C109, C209, C309
Open: Capacitor (1210)
C111, C114, C211, C214, C311, C314
R106, R108, R205, R208, R305
Open: Capacitor (0402)
Open: Resistor (0402)
DEFAULT JUMPER TABLE
JUMPER
SHUNT POSITION
Open
JU101, JU201, JU301
JU102, JU202, JU302
Open
Maxim Integrated
│ 12
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Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
MAX17644 EV Kit Schematics
MAX17644AEVKIT# Schematic Diagram
E P
1 7
E X T V C C
9
V I N
1 6
P G N D
1 4
V I N
1 5
P G N D
1 3
E N / U V L O
2
1
S S
5
1
3
+
1
2
Maxim Integrated
│ 13
www.maximintegrated.com
Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
MAX17644 EV Kit Schematics (continued)
MAX17644BEVKIT# Schematic Diagram
E P
1 7
E X T V C C
9
V I N
1 6
P G N D
1 4
V I N
1 5
P G N D
S S
1 3
E N / U V L O
2
1
5
1
3
+
1
2
Maxim Integrated
│ 14
www.maximintegrated.com
Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
MAX17644 EV Kit Schematics (continued)
MAX17644C5EVKIT# Schematic Diagram
E P
1 7
E X T V C C
9
V I N
1 6
P G N D
1 4
V I N
1 5
P G N D
1 3
E N / U V L O
2
1
S S
5
1
3
+
1
2
Maxim Integrated
│ 15
www.maximintegrated.com
Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
MAX17644 EV Kit PCB Layout
ꢀꢁ
MAX17644 EV Kits–Silk Top
ꢀꢁ
MAX17644 EV Kits–Top
Maxim Integrated
│ 16
www.maximintegrated.com
Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
MAX17644 EV Kit PCB Layout (continued)
ꢀꢁ
MAX17644 EV Kits–L2 GND
ꢀꢁ
MAX17644 EV Kits–L3 GND
Maxim Integrated
│ 17
www.maximintegrated.com
Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
MAX17644 EV Kit PCB Layout (continued)
ꢀꢁ
MAX17644 EV Kits–Bottom
ꢀꢁ
MAX17644 EV Kits–Silk Bottom
Maxim Integrated
│ 18
www.maximintegrated.com
Evaluate: MAX17644 in 3.3V and
5V Output-Voltage Applications
MAX17644A/MAX17644B/MAX17644C
Evaluation Kits
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
3/21
Initial release
—
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.
2021 Maxim Integrated Products, Inc.
│ 19
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