|
|
PDF MAX17222 Data sheet ( Hoja de datos )
| Número de pieza | MAX17222 | |
| Descripción | nanoPower Synchronous Boost Converter | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX17222 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
|
No Preview Available !
MAX17220‒MAX17225
EVALUATION KIT AVAILABLE
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
General Description
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.
Applications
●● Optical Heart-Rate Monitoring (OHRM) LED Drivers
●● Supercapacitor Backup for RTC/Alarm Buzzers
●● Primary-Cell Portable Systems
●● Tiny, Low-Power IoT Sensors
●● Secondary-Cell Portable Systems
●● Wearable Devices
●● Battery-Powered Medical Equipment
●● Low-Power Wireless Communication Products
Benefits and Features
●● 300nA Quiescent Supply Current Into OUT
●● True Shutdown Mode
• 0.5nA Shutdown Current
• Output Disconnects from Input
• No Reverse Current with VOUT 0V to 5V
●● 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 ILIM
• MAX17221/MAX17222/MAX17223: 500mA ILIM
• MAX17224/MAX17225: 1A ILIM
●● MAX17220/MAX17222/MAX17224 Enable Transient
Protection (ETP)
●● 2mm x 2mm 6-Pin μDFN
●● 0.88mm x 1.4mm 6-Bump WLP (2 x 3, 0.4mm Pitch)
Typical Operating Circuit
Ordering Information appears at end of data sheet.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
19-8753; Rev 1; 4/17
1 page  
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, CIN = 10μF, COUT = 10μF, TA = +25°C, unless otherwise noted.)
TOTAL SYSTEM SHUTDOWN CURRENT
vs. TEMPERATURE
toc01
75
70
65
60 WITH EXTERNAL 33MΩ
RESISTOR FROM IN TO EN
55
50
45
40
-50
-25 0 25 50
TEMPERATURE (ºC)
75 100
400.0
350.0
300.0
250.0
200.0
150.0
100.0
50.0
0.0
0.5
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
toc04
VOUT = 3V,
L = 2.2µH
VOUT = 5V,
L = 2.2µH
VOUT = 3.3V,
L = 2.2µH
1.5 2.5 3.5
INPUT VOLTAGE (V)
4.5
350
300
250
200
150
100
50
0
0.5
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
toc03
VOUT = 3V,
L = 1µH
VOUT = 5V,
L = 1µH
VOUT = 3.3V,
L = 1µH
1.0 1.5 2.0 2.5
INPUT VOLTAGE (V)
3.0
800
700
600
500
400
300
200
100
0.50
INDUCTORCURRENT LIMIT
vs. INPUT VOLTAGE
VOUT = 5V,
L = 1µH
VOUT = 3.3V,
L = 1µH
toc05
VOUT = 3.3V,
L = 2.2µH
VOUT = 5V,
L = 2.2µH
1.00 1.50 2.00 2.50
INPUT VOLTAGE (V)
3.00
OUTPUTVOLTAGEERROR vs.LOADCURRENT
(VOUT = 3.3V)
4 toc06
3 VIN = 2.5V
2 VIN = 2V
1
VIN = 1V
0
VIN = 1.5V
-1
-2 VIN = 0.8V
-3
-4
1
100
10000
1000000
LOAD CURRENT (µA)
EFFICIENCY vs. LOAD CURRENT
100
(VOUT = 3.3V)
toc07
90
80
70
60
VIN
=
2.5V
VIN
=
VIN
2V
=
1.5V
VIN
=
1V
50
40
1
10 100 1000 10000 100000 1000000
LOAD CURRENT (µA)
STARTUP VOLTAGEvs. LOAD CURRENT
(VOUT = 3.3V)
3 toc08
RS IS THE SOURCE RESISTANCE
2.5
2
1.5
1
0.5
0
0.1
RS = 30Ω
RS = 5Ω
RS = 1Ω
10 1000
LOAD CURRENT (µA)
100000
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX17220–MAX17225
400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Enable Transient Protection (ETP) Current
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 VIN
= 1.5V, VOUT = 3V, a 33MΩ pullup resistor and an 85%
efficiency, the IQ_ETP is expected to be 61.3nA.
IQ_ETP
=
(VOUT - VIN)
(RPULLUP + 100k)
×
1
η
×
VOUT
VIN
-1,
(Figure1)
IQ_ETP
=
(3V-1.5V)
(33M +100k)
×
1
0.85
×
3V
1.5
-1
=61.3nA,
(Figure1)
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_ETP = N/A = 0, (Figure 2)
IQ_ETP
=
(R
(VOUT )
PULLUP + 100k)
×
1
η
×
VOUT
VIN
,
(Figure 3)
IQ_ETP
=
(3V)
(33M + 100k)
×
1
0.85
×
3V
1.5V
=213.2nA,
(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
the total system quiescent current IQ_TOTAL_SYSTEM
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
MAX17221/3/5, a VIN = 1.5V, VOUT = 3V, and an 85%
efficiency, the IQ_TOTAL_SYSTEM is 706.4nA.
IQ_TOTAL_SYSTEM = IQ_IN_TOTAL + IQ_OUT
η
×
VIN
VOUT
(MAX17221/3/5)
IQ_TOTAL_SYSTEM
=
0.5nA
+
300nA
0.85
×
1.5V
3V
=
706.4nA,
(MAX17221/3/5)
IQ_TOTAL_SYSTEM = IQ_IN_TOTAL + IQ_OUT + IQ_ETP,
η
×
VIN
VOUT
(MAX17220/2/4)
IQ_TOTAL_SYSTEM
=
0.5nA
+
300nA
0.85
×
1.5V
3V
+
61.3nA
=
767.7nA,
(MAX17220/2/4)
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.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet MAX17222.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX1722 | Step-Up DC-DC Converters | Maxim Integrated |
| MAX17220 | nanoPower Synchronous Boost Converter | Maxim Integrated |
| MAX17221 | nanoPower Synchronous Boost Converter | Maxim Integrated |
| MAX17222 | nanoPower Synchronous Boost Converter | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |