|
|
PDF MAX17242 Data sheet ( Hoja de datos )
| Número de pieza | MAX17242 | |
| Descripción | Synchronous Buck Converter | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX17242 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
|
No Preview Available !
MAX17242/MAX17243
EVALUATION KIT AVAILABLE
3.5V–36V, 2A/3A, Synchronous Buck Converter
with 15µA Quiescent Current and Reduced EMI
General Description
The MAX17242/MAX17243 high-efficiency, synchronous
step-down DC-DC converters with integrated MOSFETs
operates over a 3.5V to 36V input voltage range, and
can operate in drop-out condition by running at 99% duty
cycle. The converters deliver up to 2A (MAX17242) and
3A (MAX17243) output current and generate fixed output
voltages of 3.3V/5V, along with the ability to program the
output voltage between 1V to 10V.
The devices use a current-mode-control architecture and
can be operated in the pulse-width modulation (PWM)
or pulse-frequency modulation (PFM) control schemes.
PWM operation provides constant frequency operation at
all loads, and is useful in applications sensitive to switching
frequency. PFM operation disables negative inductor
current and additionally skips pulses at light loads for
high-efficiency operation. The low-resistance, on-chip
MOSFETs ensure high efficiency at full load and simplify
the layout.
The devices are available in a compact 20-pin (5mm x 5mm)
TQFN package with exposed pad. These parts are rated for
-40°C to +85°C operation.
Applications
●● Distributed Supply Regulation
●● Wall Transformer Regulation
●● General-Purpose Point-of-Load
Ordering Information appears at end of data sheet.
Benefits and Features
●● Eliminates External Components and Reduces Total Cost
• No Schottky-Synchronous Operation for High
Efficiency and Reduced Cost
• Simple external RC Compensation for Stable
Operation at Any Output Voltage
• All-Ceramic Capacitor Solution: Ultra-Compact
Layout with as Few as Eight External Components
• PGOOD Output and High-Voltage EN Input
Simplify Power Sequencing
●● Reduces Number of DC-DC Converters to Stock
• Pin Compatibility for 2A/3A Options
• Fixed Output Voltage with ±2% Accuracy (5V/3.3V)
or Externally Resistor Adjustable (1V to 10V) with
±1% FB Accuracy
• 220kHz to 2.2MHz Adjustable Frequency with
External Synchronization
●● Reduces Power Dissipation
• 93% Peak Efficiency
• Shutdown Feature Blocks Current Flow from Input-
to-Output or Vice-Versa
• Less Than 5μA (typ) in Shutdown
• Low 15μA (typ) Quiescent Current in Standby
Mode
●● Operates Reliably
• 42V Input Voltage Transient Protection
• Fixed 8ms Internal Software Start Reduces Input
Inrush Current
• Cycle-by-Cycle Current Limit, Thermal Shutdown
with Automatic Recovery
• Reduced EMI Emission with Spread-Spectrum Control
19-7767; Rev 0; 10/15
1 page  
MAX17242/MAX17243
3.5V–36V, 2A/3A, Synchronous Buck Converter
with 15µA Quiescent Current and Reduced EMI
Electrical Characteristics (continued)
VSUP = VSUPSW = 14V, VEN = 14V, L1 = 2.2µH, CIN = 4.7µF, COUT = 44µF, CBIAS = 2.2µF, CBST = 0.1µF, RFOSC = 12kΩ, TA = TJ =
-40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.
PARAMETER
Enable Input High Threshold
Enable Input Low Threshold
Enable Threshold-Voltage
Hysteresis
SYMBOL
VEN_HI
VEN_LO
VEN_HYS
CONDITIONS
MIN
TYP
MAX UNITS
2.4 V
0.6 V
0.2 V
Enable Input Current
Spread-Spectrum Input High
Threshold
IEN
VSPS_HI
TA = +25°C
0.1
2.0
1
µA
V
Spread-Spectrum Input Low
Threshold
VSPS_LO
0.4 V
Spread-Spectrum Input Current
ISPS
TA = +25°C
POWER-GOOD AND OVERVOLTAGE-PROTECTION THRESOLDS
0.1 1
µA
PGOOD Switching Level
PGOOD Debounce Time
VRISING VFB rising, VPGOOD = high
VFALLING VFB falling, VPGOOD = low
93 95 97
90 92.5 95 %VFB
25 µs
PGOOD Output Low Voltage
PGOOD Leakage Current
Overvoltage Protection
Threshold
ISINK = 5mA
VOUT in regulation, TA = +25°C
VOUT rising (Monitor FB pin)
VOUT falling (Monitor FB pin)
0.4
1
107
104
V
µA
%
Note 2: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
Note 3: Device not in dropout condition.
Note 4: Guaranteed by design; not production tested.
Note 5: Contact the factory for SYNC frequency outside the specified range.
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX17242/MAX17243
3.5V–36V, 2A/3A, Synchronous Buck Converter
with 15µA Quiescent Current and Reduced EMI
FB
AGND
COMP
FOSC
SPS
FSYNC
OUT PGOOD
PGOOD HIGH LEVEL
PGOOD LOW LEVEL
PGOOD
COMPARATOR
FEEDBACK
SELECT
LOGIC
MAX17242
MAX17243
EN SUP
BIAS
INTERNAL BIAS
REGULATOR
SWITCHOVER
LOGIC
PV
PV
INTERNAL
SOFT -START
VREF = 1V
PWM
EAMP
CONTROL
LOGIC
PV
CLK
SPREAD
SPECTRUM
ON/OFF
FSYNC
SELECT
LOGIC
OSCILLATOR
EXTERNAL
CLOCK
SLOPE COMP
LOGIC
CONNECTED HI
(PWM MODE )
CONNECTED LO
(PFM MODE )
ZERO -
CROSSING
COMPARATOR
LX
CURRENT -LIMIT
THRESHOLD
Figure 1. Internal Block Diagram
SUPSW
BST
LX
PGND
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MAX17242.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX1724 | Step-Up DC-DC Converters | Maxim Integrated |
| MAX17242 | Synchronous Buck Converter | Maxim Integrated |
| MAX17243 | Synchronous Buck Converter | Maxim Integrated |
| MAX17244 | Synchronous Buck 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 |