MAX17224ENT+ [MAXIM]
Switching Regulator,;
| 型号： | MAX17224ENT+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Switching Regulator, 开关 |
| 文件： | 总22页 (文件大小：1041K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
MAX17220‒MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
General Description
Benefits and Features
● 300nA Quiescent Supply Current Into OUT
The MAX17220–MAX17225 is a family of ultra-low
quiescent current boost (step-up) DC-DC converters with
a 225mA/0.5A/1A peak inductor current limit and True
Shutdown™. True Shutdown disconnects the output from
the input with no forward or reverse current. The output
voltage is selectable using a single standard 1% resistor.
The 225mA (MAX17220), 500mA (MAX17221/MAX17222/
MAX17223), and 1A (MAX17224/MAX17225) peak inductor
current limits allow flexibility when choosing inductors. The
MAX17220/MAX17222/MAX17224 versions have post-
startup enable transient protection (ETP), allowing the
output to remain regulated for input voltages down to
400mV, depending on load current. The MAX17220–
MAX17225 offer ultra-low quiescent current, small total
solution size, and high efficiency throughout the entire load
range. The MAX17220–MAX17225 are ideal for battery
applications where long battery life is a must.
● True Shutdown Mode
• 0.5nA Shutdown Current
• Output Disconnects from Input
• No Reverse Current with V
0V to 5V
OUT
● 95% Peak Efficiency
● 400mV to 5.5V Input Range
● 0.88V Minimum Startup Voltage
● 1.8V to 5V Output Voltage Range
• 100mV/Step
• Single 1% Resistor Selectable Output
● 225mA, 500mA, and 1A Peak Inductor Current Limit
• MAX17220: 225mA I
LIM
• MAX17221/MAX17222/MAX17223: 500mA I
• MAX17224/MAX17225: 1A I
LIM
LIM
● MAX17220/MAX17222/MAX17224 Enable Transient
Applications
Protection (ETP)
● Optical Heart-Rate Monitoring (OHRM) LED Drivers
● Supercapacitor Backup for RTC/Alarm Buzzers
● Primary-Cell Portable Systems
● 2mm x 2mm 6-Pin μDFN
● 0.88mm x 1.4mm 6-Bump WLP (2 x 3, 0.4mm Pitch)
● Tiny, Low-Power IoT Sensors
Typical Operating Circuit
● Secondary-Cell Portable Systems
● Wearable Devices
● Battery-Powered Medical Equipment
● Low-Power Wireless Communication Products
Ordering Information appears at end of data sheet.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
19-8753; Rev 0; 2/17
MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Absolute Maximum Ratings
OUT, EN, IN to GND ...............................................-0.3V to +6V
Continuous Power Dissipation (T = 70°C)
A
RSEL to GND................ -0.3V to Lower of (V
LX RMS Current WLP..............................-1.6Arms to +1.6Arms
LX RMS Current µDFN ..................................-1Arms to +1Arms
+ 0.3V) or 6V
µDFN (derate 4.5mW/°C above +70°C)...................357.8mW
Operating Temperature Range........................... -40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -40°C to +150°C
Soldering Temperature (reflow).......................................+260°C
OUT
Continuous Power Dissipation (T = 70°C)
A
WLP (derate 10.5mW/°C above +70°C)......................840mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
µDFN
PACKAGE CODE
L622+1C
Outline Number
21-0164
90-0004
Land Pattern Number
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
)
223.6°C/W
122°C/W
JA
Junction to Case (θ
)
JC
WLP
PACKAGE CODE
N60E1+1
Outline Number
21-100128
Land Pattern Number
Refer to Application Note 1891
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
)
95.15°C/W
N/A
JA
Junction to Case (θ
)
JC
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Electrical Characteristics
(V = V
= 1.5V, V
= 3V T = -40°C to +85°C, typical values are at T = +25°C, unless otherwise noted. (Note 1))
IN
EN
OUT
,
A
A
PARAMETER
Minimum Input Voltage
Input Voltage Range
SYMBOL
CONDITIONS
Runs from output after startup, I
MIN
TYP
MAX
UNITS
mV
V
= 1mA
OUT
400
IN_MIN
V
IN
Guaranteed by LX Maximum On-Time
R ≥ 3kΩ, Typical Operating Circuit,
0.95
5.5
V
Minimum Startup Input
Voltage
L
V
0.88
0.95
V
V
IN_STARTUP
T = 25°C ,
A
See R
Selection table.
SEL
Output Voltage Range
Output Accuracy, LPM
V
1.8
-1.5
1
5
+1.5
4
OUT
For V < V
target. Note 2.
IN
OUT
V
falling, when LX switching frequency
OUT
ACC
%
%
LPM
is > 1MHz. Note 3.
Output Accuracy,
Ultra-Low-Power Mode
V
OUT
falling, when LX switching frequency
ACC
2.5
ULPM
is > 1kHz. Note 4.
MAX17220/2/4
EN = open after startup.
MAX17221/3/5 EN = V
.
T = 25°C.
300
600
900
IN
A
Not switching, V
= 104%
OUT
of V
target.
Quiescent Supply Current
Into OUT
OUT
I
nA
Q_OUT
MAX17220/2/4
EN = open after startup.
MAX17221/3/5 EN = V
.
T
A
= 85°C
470
IN
Not switching, V
= 104%
OUT
of V
target.
OUT
Quiescent Supply Current
Into IN
I
T
= 25°C
0.1
0.5
nA
nA
Q_IN
A
MAX17220/2/4 EN = Open after startup.
MAX17221/3/5 EN = V . Not switching,
V
Total Quiescent Supply
Current into IN LX EN
IN
I
100
100
Q_IN_TOTAL
= 104% of V
target. Total current
OUT
OUT
includes IN, LX, and EN. T = 25ºC.
A
MAX17220/2/3/4/5, R = 3kΩ, V
MAX17221, R = open,V = 0V,
= V = 0V.
EN
L
OUT
Shutdown Current Into IN
I
0.1
0.5
nA
nA
SD_IN
L
E N
T
= 25°C.
A
MAX17220/2/3/4/5, R = 3kΩ. MAX17221,
R = open, V
Includes LX and IN leakage. T = 25°C.
A
L
Total Shutdown Current
into IN LX
I
= 0V, V = V = 3V.
SD_TOTAL
L
EN IN LX
MAX17220
180
0.4
0.8
70
225
0.5
1
270
0.575
1.2
mA
A
Inductor Peak Current
Limit
I
Note 5
MAX17221/2/3
MAX17224/5
PEAK
LX Maximum Duty Cycle
LX Maximum On-Time
DC
Note 6
Note 6
75
%
V
V
V
V
= 1.8V
= 3V
280
270
90
365
300
120
100
450
330
150
120
OUT
OUT
OUT
OUT
t
ns
ON
= 1.8V
= 3V
LX Minimum Off-Time
t
Note 6
ns
OFF
80
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Electrical Characteristics (continued)
(V = V
= 1.5V, V
= 3V T = -40°C to +85°C, typical values are at T = +25°C, unless otherwise noted. (Note 1))
IN
EN
OUT
,
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
= 1.5V,
= 25°C
LX
0.3
T
A
LX Leakage Current
I
V
V
= V = 0V
EN
nA
LX_LEAK
OUT
V
= 5.5V,
LX
30
T = 85°C.
A
MAX17220
124
62
270
135
70
N-Channel On-Resistance
P-Channel On-Resistance
R
R
= 3.3V
= 3.3V
MAX17221/2/3
MAX17224/5
MAX17220
mΩ
DS(ON)
OUT
31
300
150
75
600
300
150
V
V
MAX17221/2/3
MAX17224/5
mΩ
DS(ON)
OUT
Synchronous Rectifier
Zero-Crossing As Percent
of Peak Current Limit
I
= 3.3V, Note 7
2.5
5
7.5
%
ZX
OUT
V
When LX switching stops, EN falling
EN rising
300
500
600
0.1
IL
Enable Voltage Threshold
mV
nA
V
850
IH
MAX17221/3/5, V = 5.5V, T = 25°C
EN
A
Enable Input Leakage
I
EN_LK
MAX17220/2/4, V
MAX17220/2/4
= 0V, T = 25°C,
0.1
EN
A
Enable Input Impedance
100
200
1
kΩ
Required Select Resistor
Accuracy
Use the nearest ±1% resistor from R
Selection Table
SEL
R
-1
%
SEL
Select Resistor Detection
Time
t
V
= 1.8V, C < 2pF, Note 8
RSEL
360
600
1320
μs
RSEL
OUT
Note 1: Limits are 100% production tested at T = +25°C. Limits over the operating temperature range are guaranteed through
A
correlation using statistical quality control (SQC) methods.
Note 2: Guaranteed by the Required Select Resistor Accuracy parameter.
Note 3: Output Accuracy, Low Power mode is the regulation accuracy window expected when I
> I
. See PFM
OUT
OUT_TRANSITION
Control Scheme and V
ERROR vs I
TOC for more details. This accuracy does not include load, line, or ripple.
OUT
LOAD
Note 4: Output Accuracy, Ultra-Low Power mode is the regulation accuracy window expected when I
< I
. See
OUT
OUT_TRANSITION
PFM Control Scheme and V
ERROR vs. I
TOC for more details. This accuracy does not include load, line, or ripple.
OUT
LOAD
Note 5: The maximum current limit parameter accounts for 5% of overcurrent due to propagation delays. This is a static measurement.
See I vs. V TOC.
LIM
IN
Note 6: Guaranteed by measuring LX frequency and duty cycle
Note 7: This is a static measurement.
Note 8: This is the time required to determine RSEL value. This time adds to the startup time. See Output Voltage Selection.
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Typical Operating Characteristics
(MAX17222ELT+, IN = 1.5V, OUT = 3V, L = 2.2μH Coilcraft XFL4020-222, C = 10μF, C
= 10μF, T = +25°C, unless otherwise noted.)
IN
OUT
A
MAXIMUM OUTPUT CURRENT
TOTAL SYSTEM SHUTDOWN CURRENT
vs. INPUT VOLTAGE
vs. TEMPERATURE
toc01
toc03
350
75
70
65
300
VOUT = 3V,
L = 1µH
250
WITH EXTERNAL 33MΩ
RESISTOR FROM IN TO EN
200
150
60
55
50
45
40
VOUT = 3.3V,
L = 1µH
100
VOUT = 5V,
L = 1µH
50
0
0.5
1.0
1.5
2.0
2.5
3.0
-50
0.5
1
-25
0
25
50
75
100
INPUT VOLTAGE (V)
TEMPERATURE (ºC)
OUTPUT VOLTAGE ERROR vs. LOAD CURRENT
(VOUT = 3.3V)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
INDUCTOR CURRENT LIMIT
vs. INPUT VOLTAGE
toc04
toc06
toc05
400.0
350.0
300.0
250.0
200.0
150.0
100.0
50.0
800
700
600
500
400
300
200
100
4
VOUT = 3.3V,
L = 1µH
VIN = 2.5V
3
VOUT = 5V,
L = 1µH
VOUT = 3V,
L = 2.2µH
VIN = 2V
2
1
VIN = 1V
0
VOUT = 5V,
L = 2.2µH
VOUT = 3.3V,
L = 2.2µH
VIN = 1.5V
-1
VOUT = 5V,
L = 2.2µH
-2
-3
-4
VIN = 0.8V
VOUT = 3.3V,
L = 2.2µH
0.0
1.5
2.5
3.5
4.5
0.50
1.00
1.50
2.00
2.50
3.00
1
100
10000
1000000
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
LOAD CURRENT (µA)
STARTUP VOLTAGE vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
(VOUT = 3.3V)
toc08
toc07
3
2.5
2
100
90
80
70
60
50
40
RS IS THE SOURCE RESISTANCE
1.5
1
VIN = 1.5V
VIN = 2.5V
VIN = 1V
RS = 30Ω
VIN = 2V
RS = 5Ω
RS = 1Ω
0.5
0
10
100
1000 10000 100000 1000000
0.1
10
1000
100000
LOAD CURRENT (µA)
LOAD CURRENT (µA)
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Typical Operating Characteristics (continued)
(MAX17222ELT+, IN = 1.5V, OUT = 3V, L = 2.2μH Coilcraft XFL4020-222, C = 10μF, C
= 10μF, T = +25°C, unless otherwise noted.)
A
IN
OUT
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Typical Operating Characteristics (continued)
(MAX17222ELT+, IN = 1.5V, OUT = 3V, L = 2.2μH Coilcraft XFL4020-222, C = 10μF, C
= 10μF, T = +25°C, unless otherwise noted.)
IN
OUT
A
/div
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Bump Configuration
TOP VIEW
+
OUT
LX
1
2
3
6
5
4
EN
IN
MAX1722x
GND
SEL
µDFN
[6 WLP]
TOP VIEW (BUMP SIDE DOWN)
1
2
3
A
B
OUT
EN
LX
IN
GND
SEL
Bump Description
PIN
NAME
FUNCTION
6 WLP
A1
µDFN
1
2
3
6
OUT
LX
Output Pin. Connect a 10µF X5R ceramic capacitor (minimum 2µF capacitance) to ground.
Switching Node Pin. Connect the inductor from IN to LX.
Ground Pin.
A2
A3
GND
EN
B1
Active-High Enable Input. See Supply Current section for recommended connections.
Input Pin. Connect a 10µF X5R ceramic capacitor (minimum 2µF capacitance) to ground.
Depending on the application requirements, more capacitance may be needed (i.e., BLE).
B2
B3
5
4
IN
Output Voltage Select Pin. Connect a resistor from SEL to GND based on the desired
output voltage. See RSEL Selection table.
SEL
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Functional Diagrams
2.2µH
LX
MAX17220/1/2/3/4/5
OPTIONAL TRUE
SHUTDOWN
IN
STARTUP
OUT
CIN
10µF
COUT
10µF
CURRENT
SENSE
MODULATOR
REFERENCE
OPTIONAL
ENABLE PIN
TRANSIENT
PROTECTION
OUTPUT
VOLTAGE
SELECTOR
EN
SEL
RSEL
GND
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Detailed Description
The MAX17220/1/2/3/4/5 compact, high-efficiency, step-
up DC-DC converters have ultra-low quiescent current,
are guaranteed to start up with voltages as low as 0.95V,
and operate with an input voltage down to 400mV,
depending on load current. True Shutdown disconnects
the input from the output, saving precious battery life.
Every detail of the MAX17220/1/2/3/4/5 was carefully
chosen to allow for the lowest power and smallest solution
size. Such details as switching frequencies up to 2.5MHz,
tiny package options, a single-output setting resistor,
300ns fixed turn-on time, as well as three current limit
options, allow the user to minimize the total solution size.
Supply Current
Figure 1. For All Versions, EN Pin Can Be Driven by an Open-
Drain Microcontroller GPIO.
True Shutdown Current
The total system shutdown current (I
)
SD_TOTAL_SYSTEM
is made up of the MAX17220/1/2/3/4/5's total shutdown
current (I ) and the current through an external pul-
SD_TOTAL
IN
lup resistor, as shown in Figure 1. I
is listed
OUT
SD_TOTAL
in the Electrical Characteristics table and is typically
0.5nA. It is important to note that I includes LX
SD_TOTAL
and IN leakage currents. (See the Shutdown Supply
Current vs. Temperature graph in the Typical Operating
MAX 17221/3/5
VIO
µC
Characteristics section.) I
current can
SD_TOTAL_SYSTEM
be calculated using the formula below. For example, for the
MAX17220/1/2/3/4/5 with EN connected to an open-drain
GPIO of a microcontroller, a V = 1.5V, V
= 3V, and a
IN
SD_TOTAL_SYSTEM
OUT
33M pullup resistor, I
current is 45.9nA.
V
IN
PULLUP
I
= I
+
SD_TOTAL
SD_TOTAL_SYSTEM
R
Figure 2. Only the MAX17221/3/5’s EN Pin Can Be Driven by a
Push-Pull Microcontroller GPIO.
1.5
= 0.5nA +
= 45.9nA, (Figure1)
33MΩ
Figure 2 shows a typical connection of the MAX17221/3/5
to a push-pull microcontroller GPIO. I
current can be calculated using the formula below. For
SD_TOTAL_SYSTEM
IN
OUT
example, a MAX17221/35 with EN connected to a push-
pull microcontroller GPIO, V = 1.5V, and V
= 3V,
IN
OUT
I
current is 0.5nA.
SD_TOTAL_SYSTEM
MAX17220/2/4
I
= I
= 0.5nA
SD_TOTAL
SD_TOTAL_SYSTEM
µC
(Figure2, Figure3)
33M
GPIO
Figure 3 shows a typical connection of the MAX17220/2/4
with a push-button switch to minimize the I
SD_TOTAL_
current. I
current can be
SYSTEM
SD_TOTAL_SYSTEM
calculated using the formula above. For example, a
MAX17220/2/4 with EN connected as shown in Figure 3,
Figure 3. The MAX17220/2/4’s Total System Shutdown Current
Will Only Be Leakage If Able To Use Push-Button As Shown.
with V = 1.5V and V
= 3V, the I
IN
OUT
SD_TOTAL_SYSTEM
current is 0.5nA.
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
the total system quiescent current IQ_TOTAL_SYSTEM
Enable Transient Protection (ETP) Current
using the efficiency η from the flat portion of the
efficiency graph in the Typical Operating Characteristics
section while the device is in ULPM. See the PFM control
scheme section for more info on ULPM. Do not use the
efficiency for your actual load current. To calculate the
IQ_ETP for the MAX17220/2/4, see the Enable Transient
Protection (ETP) Current section. If you are using the
versions of the part without enable input transient protection
(using MAX17221/3/5) or if you are using any part version
and the electrical path from the EN pin is opened after startup,
then the IQ_ETP current will be zero. For example, for the
The MAX17220/2/4 have internal circuitry that helps
protect against accidental shutdown by transients on the
EN pin. Once the part is started up, these parts allow the
voltage at IN to drop as low as 400mV while still keeping
the part enabled, depending on the load current. This
feature comes at the cost of slightly higher supply
current that is dependent on the pullup resistor resistance.
The extra supply current for this protection option can be
calculated by the equation below. For example, for the
MAX17220/2/4 used in the Figure 1 connection, a V
IN
= 1.5V, V
= 3V, a 33MΩ pullup resistor and an 85%
OUT
MAX17221/3/5, a V = 1.5V, V
= 3V, and an 85%
IN
OUT
efficiency, the IQ_ETP is expected to be 61.3nA.
efficiency, the IQ_TOTAL_SYSTEM is 706.4nA.
(V
- V
)
V
OUT
V
IN
1
OUT
IN
IQ_OUT
IQ_ETP =
×
×
-1 ,
IQ_TOTAL_SYSTEM = IQ_IN_TOTAL +
(MAX17221/3/5)
(R
+100k)
η
PULLUP
V
IN
η×
(Figure1)
V
OUT
(3V-1.5V)
1
3V
IQ_ETP =
×
×
-1 = 61.3nA,
300nA
IQ_TOTAL_SYSTEM = 0.5nA +
= 706.4nA,
(33M+100k) 0.85 1.5
1.5V
0.85×
(Figure1)
3V
(MAX17221/3/5)
Use the efficiency η from the flat portion of the efficiency
typical operating curves while the device is in ultra-low-
power mode (ULPM). See the PFM Control Scheme
section for more info on ULPM. Do not use the efficiency
for your actual load current. If you are using the versions
of the part without enable input transient protection (using
MAX17221/3/5), or if you are using any part version and
the electrical path from the EN pin is opened after startup,
then there is no IQ_ETP current and it will be zero.
IQ_OUT
IQ_TOTAL_SYSTEM = IQ_IN_TOTAL +
+ IQ_ETP,
V
IN
η×
V
OUT
(MAX17220/2/4)
300nA
IQ_TOTAL_SYSTEM = 0.5nA +
+ 61.3nA = 767.7nA,
1.5V
0.85×
3V
(MAX17220/2/4)
IQ_ETP = N A = 0, (Figure 2)
/
PFM Control Scheme
The MAX17220/1/2/3/4/5 utilizes a fixed on-time, current-
limited, pulse-frequency-modulation (PFM) control
scheme that allows ultra-low quiescent current and high
efficiency over a wide output current range. The inductor
current is limited by the 0.225A/0.5A/1A N-channel
current limit or by the 300ns switch maximum on-time.
During each on cycle, either the maximum on-time or the
maximum current limit is reached before the off-time of
the cycle begins. The MAX17220/1/2/3/4/5's PFM control
scheme allows for both continuous conduction mode
(CCM) or discontinuous conduction mode (DCM). When
the error comparator senses that the output has fallen
below the regulation threshold, another cycle begins. See
the MAX17220/1/2/3/4/5 simplified functional diagram.
(V
)
V
OUT
V
IN
1
OUT
IQ_ETP =
×
×
,
(R
+100k)
η
PULLUP
(Figure 3)
(3V)
1
3V
IQ_ETP =
×
×
= 213.2nA,
(33M +100k) 0.85 1.5V
(Figure 3)
Quiescent Current
The MAX17220/1/2/3/4/5 has ultra-low quiescent current
and was designed to operate at low input voltages by
bootstrapping itself from its output by drawing current
from the output. Use the equation below to calculate
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
The MAX17220/1/2/3/4/5 automatically switches between
the ULPM, low-power mode (LPM) and high-power mode
(HPM), depending on the load current. Figure 4 and
Figure 5 show typical waveforms while in each mode.
The output voltage, by design, is biased 2.5% higher
while in ULPM so that it can more easily weather a future
large load transient. ULPM is used when the system is
in standby or an ultra-low-power state. LPM and HPM
are useful for sensitive sensor measurements or during
wireless communications for medium output currents
and large output currents respectively. The user can cal-
culate the value of the load current where ULPM transi-
Figure 4. ULPM, LPM, and HPM Waveforms (Part 1).
Figure 5. ULPM, LPM, and HPM Waveforms (Part 2).
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
tions to LPM using the equation below. For example, for
= 1.5V, V = 3V and L = 2.2µH, the UPLM to LPM
transition current happens at approximately 1.49mA and
a no-load frequency of 11.5Hz. The MAX17220/1/2/3/4/5
enters HPM when the inductor current transitions from
DCM to CCM.
our customers to stock just one part in their inventory
system and use it in multiple projects with different output
voltages just by changing a single standard 1% resistor.
Lastly, RSEL eliminates wasting current continuously through
feedback resistors for ultra low power battery operated
products. Select the RSEL resistor value by choosing the
desired output voltage in the table below.
V
IN
OUT
2
RSEL Selection Table
300ns
2L
V
η
IN
IOUT_TRANSITION =
×
×
V
V
STD RES
1% (kΩ)
17.5µs
OUT
OUT
-1
(V)
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
V
IN
OPEN
909
768
634
536
452
383
324
267
226
191
162
133
113
2
300ns
1.5V
3V
0.85
17.5µs
=
×
×
= 1.49mA
2× 2.2µH
-1
1.5V
The minimum switching frequency can be calculated by
this equation below:
1
IQ
f
=
×
SW(MIN)
17.5µs IOUT_TRANSITION
1
300nA
f
=
×
= 11.5Hz
SW(MIN)
17.5µs 1.49mA
Design Procedure
Output Voltage Selection
The MAX17220/1/2/3/4/5 has a unique single-resistor output
selection method known as RSEL, as shown in Figure 6.
At startup, the MAX17220/1/2/3/4/5 uses up to 200µA
only during the select resistor detection time, typically for
600µs, to read the RSEL value. RSEL has many benefits,
which include lower cost and smaller size, since only one
resistor is needed versus the two resistors needed in typi-
cal feedback connections. Another benefit is RSEL allows
95.3
80.6
66.5
56.2
47.5
40.2
34
28
23.7
20
16.9
14
11.8
10
8.45
7.15
5.9
4.99
SHORT
Figure 6. Single RSEL Resistor Sets the Output Voltage.
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
good starting point is to use the same capacitance value at
Inductor Selection
the input as for the output.
A2.2µH inductor value provides the best size and efficiency
tradeoff in most applications. Smaller inductance values
typically allow for the smallest physical size and larger
inductance values allow for more output current assuming
continuous conduction mode (CCM) is achieved. Most
applications are expected to use a 2.2µH, as shown in
the example circuits. For low input voltages, 1µH will
work best. If one of the example application circuits do not
provide enough output current, use the equations below
to calculate a larger inductance value that meets the
output current requirements, assuming it is possible to
The minimum output capacitance that ensures stability is
2µF. At minimum a standard 10µF X5R (or X7R) ceramic
capacitor is recommended for most applications. Due to
DC bias effects the actual capacitance can be 80% lower
than the nominal capacitor value. The output ripple can be
calculated with the equation below. For example, For the
MAX17220/1/2/3/4/5 with a V = 1.5V, V
an effective capacitance of 5µF, a capacitor ESR of 4mΩ,
the expected ripple is 7mV.
= 3V, and
IN
OUT
V_RIPPLE = IL_PEAK ×ESR_COUT
achieve. For the equations below, choose an I between
IN
0.9 x I
and half I . It is not recommended to use an
LIM
LIM
1
2
1
+
IL_PEAK × t
×
OFF
inductor value smaller than 1µH or larger than 4.7µH. See
the Typical Operating Characteristics section for choosing
the value of efficiency η using the closest conditions for
your application. An example calculation has been
C
(Effective)
OUT
Where,
provided for the MAX17222 that has an I
= 500mA,
LIM
V
1.5V
IN
IL_PEAK =
× t
=
× 300ns = 204mA
a V (min) = 1.8V, a V
= 3V, and a desired I
ON
IN
OUT
OUT
L
2.2µH
of 205mA, which is beyond one of the 2.2µH example
circuits. The result shows that the inductor value can be
changed to 3.3µH to achieve a little more output current.
V
1.5V
IN
-V
V
×I
3V × 205mA
0.85×1.8V
OUT OUT
t
= t
×
ON
= 300ns×
= 300ns
OFF
I
=
=
= 402mA;
IN
V
3V -1.5V
OUT IN
η× V
IN
I
< I < 0.9 × I
LIM
LIM IN
C
(Effective) = 5µF, ESR_COUT for Murata
OUT
∆I=(I
- I )× 2 = (500mA - 402mA)× 2 = 196mA
GRM155R61A106ME44 is 4mΩ from 200kHz to 2MHz
LIM IN
1
V_RIPPLE = 204mA × 4mΩ + 204mA
V
× t
ON(MAX)
1.8V × 300ns
IN
2
L
=
=
= 2.76µH
MIN
∆I
196mA
1
× 300ns×
= 7mV
= > 3.3µH closest standard value
5µF
Capacitor Selection
PCB Layout Guidelines
Input capacitors reduce current peaks from the battery
and increase efficiency. For the input capacitor, choose a
ceramic capacitor because they have the lowest equivalent
series resistance (ESR), smallest size, and lowest cost.
Choose an acceptable dielectric such as X5R or X7R.
Other capacitor types can be used as well but will have
larger ESR. The biggest down side of ceramic capacitors is
their capacitance drop with higher DC bias and because
of this at minimum a standard 10µF ceramic capacitor
is recommended at the input for most applications. The
minimum recommended capacitance (not capacitor) at
the input is 2µF for most applications. For applications
that use batteries that have a high source impedance
greater than 1Ω, more capacitance may be needed. A
Careful PC board layout is especially important in a nano-
current DC-DC converters. In general, minimize trace
lengths to reduce parasitic capacitance, parasitic resistance
and radiated noise. Remember that every square of 1oz
copper will result in 0.5mΩ of parasitic resistance. The
connection from the bottom of the output capacitor and
the ground pin of the device must be extremely short
as should be that of the input capacitor. Keep the main
power path from IN, LX, OUT, and GND as tight and short
as possible. Minimize the surface area used for LX since
this is the noisiest node. Lastly, the trace used for RSEL
should not be too long nor produce a capacitance of more
than a few pico Farads.
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Applications Information
Primary Cell Bluetooth Low Energy (BLE) Temperature Sensor Wearable
OPTIONAL LDO
400mV* TO 1.6V
2.75V
3V
MAX1725
LDO
MAX30205
X
MEDICAL GRADE
TEMP SENSOR
MAX1722
BOOST
BATTERY
SILVER OXIDE
ZINC AIR
AAAA
AAA
AA
I2C PORT
BLE RADIO
CORTEX
M4
FLASH
RAM
* LOAD CURRENT DEPENDENT
LP BLE/NFC uC W/
INTERNAL BUCK
DC-DC
BUCK
1.3V
NFC
3V
GND
Figure 7. MAX1722x/MAX30205 Temperature Sensor Wearable Solution
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Primary Cell Bluetooth Low Energy (BLE) Optical Heart Rate Monitoring (OHRM) Sensor Wearable
0.8V TO 1.6V
3.3V LED SUPPLY
(OR ADJ TO 5V)
MAX30110
MAX30101
MAX30102
OHRM
X
MAX1722
BOOST
BATTERY
SILVER OXIDE
ZINC AIR
AAAA
AAA
AA
I2C PORT
BLE RADIO
CORTEX
M4
FLASH
RAM
LP BLE/NFC uC W/
INTERNAL BUCK
DC-DC
BUCK
1.3V
3.3V
3.6V MAX
NFC
GND
Figure 8. MAX1722x/MAX30110/MAX30101/MAX30102 Optical Heart Rate Monitor (OHRM) Sensor Wearable Solution for Primary Cells.
Maxim Integrated
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Secondary Rechargable Lithium Cell Bluetooth Low Energy (BLE) Optical Heart Rate Monitor
(OHRM) Sensor Wearable
2.7V TO 4.2V
OPTIONAL LDO LED SUPPLY
4.5V
5V
MAX8880
MAX30110
MAX30101
MAX30102
OHRM
LDO
OR
ADJ
X
MAX1722
BOOST
uC
BATTERY
LI+
MAX32625/26
MAX32620/21
I2C
Figure 9. MAX1722x/MAX30110/MAX30101/MAX30102 Optical Heart Rate Monitor (OHRM) Sensor Wearable Solution for
Secondary Cells.
Supercap Backup Solution For Real-Time Clock (RTC) Preservation
Figure 10. MAX1722x/MAX14575/DS1341 RTC Backup Solution.
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Supercap Backup Solution To Maintain Uniform Sound for Alarm Beeper Buzzers
Figure 11. MAX1722x/MAX14575 Solution For Alarm Beeper Buzzers.
Zero Reverse Current In True Shutdown for Multisource Applications
Figure 12. MAX1722x Has Zero Reverse-Current in True Shutdown.
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Typical Application Circuits
Smallest Solution Size – 0603 Inductor – MAX17221/2/3 500mA ILIM (Part 1)
IN
IN
1.8V TO 3V
0.8V TO 3V
L1 2.2µH
L1 1µH
OUT
OUT
CIN
10µF
CIN
10µF
EN
EN
3.3V, 160mA
3V, 185mA
3.3V,16mA
3V, 20mA
COUT
10µF
MAX17221/2/3
COUT
10µF
MAX17221/2/3
GND
GND
STARTUP
0.88 (TYP)
RSEL
RSEL
L1 1UH/0603 MURATA DFE160808S-1R0M
L1 2.2UH/0603 MURATA MFD160810-2R2M
CIN 10UF/0402/X5R/6.3V MURATA GRM155R60J106ME44
COUT 10UF/0402/X5R/10V MURATA GRM155R61A106ME44
3.3V OUTPUT RSEL 80.6K ±1%
CIN 10UF/0402/X5R/6.3V MURATA GRM155R60J106ME44
COUT 10UF/0402/X5R/10V MURATA GRM155R61A106ME44
3.3V OUTPUT RSEL 80.6K +/-1%
3V OUTPUT RSEL 133K +/-1%
3V OUTPUT RSEL 133K ±1%
Smallest Solution Size – 0603 Inductor – MAX17221/2/3 500mA ILIM (Part 2)
DFM18PAN2R2MG0L
DFM18PAN2R2MG0L
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Typical Application Circuits (continued)
Highest Efficiency Solution – 4mm x 4mm Inductor – MAX17221/2/3 500mA ILIM (Part 1)
Highest Efficiency Solution – 4x4mm Inductor – MAX17221/2/3 500mA ILIM (Part 2)
Maxim Integrated
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Ordering Information
INPUT PEAK
CURRENT
IPEAK
ENABLE TRANSIENT
PROTECTION
(ETP)
TEMPERATURE
PART NUMBER
PIN-PACKAGE
TRUE SHUTDOWN
RANGE
MAX17220ENT+*
MAX17221ENT+*
MAX17222ENT+*
MAX17223ENT+*
MAX17224ENT+*
MAX17225ENT+*
MAX17220ELT+*
MAX17221ELT+*
MAX17222ELT+
MAX17223ELT+*
MAX17224ELT+*
MAX17225ELT+*
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
6 WLP
6 WLP
6 WLP
6 WLP
6 WLP
6 WLP
6 μDFN
6 μDFN
6 μDFN
6 μDFN
6 μDFN
6 μDFN
225mA
0.5A
0.5A
0.5A
1A
Yes
—
Yes
—
Yes
Yes
Yes
Yes
Yes
—
Yes
—
Yes
—
1A
225mA
0.5A
0.5A
0.5A
1A
Yes
—
Yes
Yes
Yes
Yes
Yes
—
Yes
—
1A
*Future product—contact factory for availability.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
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MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
2/17
Initial release
—
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.
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. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2017 Maxim Integrated Products, Inc.
│ 22
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