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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX17521 Datasheet

Synchronous Step-Down DC-DC Converter

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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
C1
2.2μF
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 Effi-
ciency
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
• High Industrial -40°C to +125°C Ambient Operat-
ing Temperature Range/-40°C to +150°C Junction
Temperature Range
VIN
7.5V–60V
C2
2.2μF
VOUT1
5V, 1A
C3
10μF
R1
82.5kΩ
R2
18.2kΩ
C6
1μF
L1
22μH
EN/UVLO1 VIN1
PGND1
PGND2
VIN2 EN/UVLO2
MODE1
VCC1
SGND1
MODE2
C16
VCC2
SGND2
1μF
RESET1
LX1
MAX17521
RESET2
LX2
FB1 SS1
C7
3300pF
C10
33pF
COMP1 FSEL SYNC COMP2
SS2 FB2
C8
3300pF
2700pF
R5
14kΩ
C12
22pF
C9
R8
19.1kΩ
C11
2700pF
L2
15μH
C4
22μF
VOUT2
3.3V, 1A
R9
54.9kΩ
R10
20.5kΩ
L1 = XAL5050-223, 5.3 x 5.5mm
L2 = XAL4040-153, 4 x 4mm
fSW = 560kHz
19-7479; Rev 2; 6/17


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX17521 Datasheet

Synchronous Step-Down DC-DC Converter

No Preview Available !

MAX17521
60V, 1A, Dual-Output, High-Efficiency,
Synchronous Step-Down DC-DC Converter
Absolute Maximum Ratings
VIN_ to PGND_.......................................................-0.3V to +65V
EN/UVLO_ to SGND_.............................. -0.3V to (VIN_ + 0.3V)
LX_ to PGND_......................................... -0.3V to (VIN_ + 0.3V)
FB_, RESET_, FSEL, MODE_,
COMP_, VCC_, SYNC, SS_ to SGND_...............-0.3V to +6V
SGND_ to PGND_................................................-0.3V to +0.3V
LX Total RMS Current.........................................................±1.6A
Continuous Power Dissipation (TA = +70°C)
(derate 28.6mW/°C above +70°C)
(multilayer board).....................................................2285.7mW
Output Short-Circuit Duration.....................................Continuous
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +160°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................+260°C
Note 1: Junction temperature greater than +125°C degrades operating lifetimes.
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
PACKAGE TYPE: 24-PIN TQFN
Package Code
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θJA)
Junction to Case (θJC)
T2445+1C
21-0201
90-0083
35°C/W
1.8°C/W
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.
Electrical Characteristics
(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 = -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
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
INPUT SUPPLY (VIN)
Input Voltage Range
V­IN_
4.5 60 V
Input Shutdown Current
IIN-SH
VEN_ = 0V, shutdown mode
1 3.5 µA
Input Switching Current
IQ_PFM_
IQ_PWM_
VMODE_> 2V
VMODE_< 0.8V,
VCOMP_ = 0.8V
VFSEL > 2V
VFSEL < 0.8V
135 260
5
3.7
µA
mA
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX17521
Description Synchronous Step-Down DC-DC Converter
Maker Maxim Integrated
Total Page 22 Pages
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