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PDF MAX17521 Data sheet ( Hoja de datos )
| Número de pieza | MAX17521 | |
| Descripción | Synchronous Step-Down DC-DC Converter | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX17521 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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MAX17521
EVALUATION KIT AVAILABLE
60V, 1A, Dual-Output, High-Efficiency,
Synchronous Step-Down DC-DC Converter
General Description
The MAX17521 dual-output, high-efficiency, high-voltage,
synchronous step-down DC-DC converter with integrated
MOSFETs operates over a 4.5V to 60V input. The converter
can deliver up to 1A at each output. Each output is
programmable from 0.9V to 92%VIN. The feedback voltage
regulation accuracy over -40°C to +125°C is ±1.7%.
The MAX17521 uses peak-current-mode control. Each
output can be operated in the pulse-width modulation
(PWM) or pulse-frequency modulation (PFM) control
schemes.
The MAX17521 is available in a 24-pin (4mm x 5mm)
TQFN package. Simulation models are available.
Applications
●● Industrial Control Power Supplies
●● CPU, DSP, or FPGA Power
●● Distributed Supply Regulation
●● General-Purpose Point of Load
Ordering Information appears at end of data sheet.
Typical Application Circuit
Benefits and Features
●● Reduces External Components and Total Cost
• No Schottky—Synchronous Operation
• All-Ceramic Capacitors, Compact Layout
●● Reduces Number of DC-DC Regulators to Stock
• Wide 4.5V to 60V Input
• Each Output Adjustable From 0.9V to 92%VIN
• Pin-Selectable 560kHz or 300kHz Switching
Frequency
• Independent Input Voltage Pin for Each Output
●● Reduces Power Dissipation
• Peak Efficiency > 90%
• PFM Mode Enables Enhanced Light-Load Efficiency
• 1μA Shutdown Current
●● Operates Reliably in Adverse Industrial Environments
• Hiccup Mode Overload Protection
• Adjustable Soft-Start Pin for Each Output
• Built-In Output Voltage Monitoring with RESET for
Each Output
• Adjustable EN/UVLO Threshold for Each Output
• Monotonic Startup Into Prebiased Load
• Overtemperature Protection
• -40°C to +125°C Operation
C1
2.2μF
VIN
7.5V–60V
C2
2.2μF
VOUT1
5V, 1A
C3
10μF
R1
82.5kΩ
R2
18.2kΩ
C6
1μF
L1
22μH
EN/UVLO 1 VIN1
PGND 1
PGND 2
VIN2 EN/UVLO2
MODE 1
VCC1
SGND 1
RESET 1
LX1
MAX17521
MODE 2
C16
VCC2
SGND 2
1μF
RESET 2
LX2
L2
15μH
C4
22μF
FB1 SS1
C7
3300 pF
C10
33pF
COMP1 FSEL SYNC COMP2
SS2 FB2
C8
3300 pF
2700 pF
R5
14kΩ
C12
22pF
C9
R8
19.1k Ω
C11
2700 pF
VOUT2
3.3V, 1A
R9
54.9kΩ
R10
20.5kΩ
19-7479; Rev 0; 3/15
1 page  
MAX17521
60V, 1A, Dual-Output, High-Efficiency,
Synchronous Step-Down DC-DC Converter
Electrical Characteristics (continued)
(VIN_ = +24V, VSGND_ = VPGND_ = VFSEL = 0V, CIN_ = 2.2μF, CVCC_ = 1μF, VEN/UVLO_ = 1.5V, CSS_ = 0.01μF, FB_ = 0.98 x VFB-REG,
COMP_ = unconnected, LX_ = unconnected, RESET_ = unconnected. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical
values are at TA = +25°C. All voltages are referenced to SGND_, unless otherwise noted.) (Note 2)
PARAMETER
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
SYMBOL
CONDITIONS
Temperature rising
MIN TYP MAX UNITS
165 °C
10 °C
Note 2: Limits are 100% tested at TA = +25°C. Limits over the operating temperature range and relevant supply voltage range are
guaranteed by design and characterization.
Note 3: Guaranteed by design, not production tested.
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX17521
Pin Configuration
60V, 1A, Dual-Output, High-Efficiency,
Synchronous Step-Down DC-DC Converter
TOP VIEW
PGND1 1
VIN1 2
EN/UVLO1 3
VCC1 4
FB1 5
SS1 6
SGND1 7
24 23 22 21 20
+
MAX17521
EP
19 PGND2
18 VIN2
17 EN/UVLO2
16 VCC2
15 FB2
14 SS2
13 SGND2
8 9 10 11 12
TQFN
(4mm × 5mm)
Pin Description
PIN NAME
1 PGND1
2 VIN1
3 EN/UVLO1
4 VCC1
5 FB1
6 SS1
7 SGND1
8 COMP1
FUNCTION
Power Ground Connection of Converter 1. Connect PGND1 externally to the power ground plane.
Connect SGND and PGND pins together at the ground return path of the VCC bypass capacitors.
Power-Supply Input of Converter 1. The input supply range is from 4.5V to 60V. Decouple to PGND1
with a 2.2μF capacitor; place the capacitor close to the VIN1 and PGND1 pins.
Enable/Undervoltage Lockout Input for Converter 1. Drive EN/UVLO1 high to enable converter 1.
Connect to the center of the resistive divider between VIN1 and SGND1 to set the input voltage at which
the converter 1 turns on. Pull up to VIN1 for always-on operation.
5V LDO Output for Converter 1. Bypass VCC1 with 1μF ceramic capacitance to SGND1.
Feedback Input for Converter 1. Connect FB1 to the center of the resistive divider between VOUT1 and
SGND1. See the Adjusting Output Voltage section for more details.
Soft-start Input for Converter 1. Connect a capacitor from SS1 to SGND1 to set the soft-start time for
converter 1.
Analog Ground Connection for Converter 1.
Loop Compensation Pin for Converter 1. Connect an RC network from COMP1 to SGND1. See the
Loop Compensation section for more details.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MAX17521.PDF ] | |
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