DC-DC Converter. MAX15020 Datasheet

MAX15020 Converter. Datasheet pdf. Equivalent

Part MAX15020
Description Step-Down DC-DC Converter
Feature www.DataSheet4U.com 19-0811; Rev 0; 4/07 KIT ATION EVALU LE B A IL A AV 2A, 40V Step-Down DC-DC Co.
Manufacture Maxim Integrated Products
Datasheet
Download MAX15020 Datasheet



MAX15020
MAX15020
EVALUATION KIT AVAILABLE
2A, 40V Step-Down DC-DC Converter with
Dynamic Output-Voltage Programming
General Description
The MAX15020 high-voltage step-down DC-DC converter
operates over an input voltage range of 7.5V to 40V. The
device integrates a 0.2Ω high-side switch and is capable
of delivering 2A load current with excellent load and line
regulation. The output is dynamically adjustable from
0.5V to 36V through the use of an external reference
input (REFIN). The MAX15020 consumes only 6μA in
shutdown mode.
The device utilizes feed-forward voltage-mode architecture
for good noise immunity in the high-voltage switching envi-
ronment and offers external compensation for maximum
flexibility. The switching frequency is selectable to 300kHz
or 500kHz and can be synchronized to an external clock
signal of 100kHz to 500kHz by using the SYNC input. The
IC features a maximum duty cycle of 95% (typ) at 300kHz.
The device includes configurable undervoltage lockout
(UVLO) and soft-start. Protection features include cycle-
by-cycle current limit, hiccup-mode for output short-circuit
protection, and thermal shutdown. The MAX15020 is avail-
able in a 20-pin TQFN 5mm x 5mm package and is rated
for operation over the -40°C to +125°C temperature range.
Applications
Printer Head Driver Power Supply
Industrial Power Supply
Step-Down Power Supply
Typical Operating Circuit
VIN
(7.5V TO 40V)
Features
● Wide 7.5V to 40V Input Voltage Range
2A Output Current, Up to 96% Efficiency
Dynamic Programmable Output Voltage (0.5V to 36V)
Maximum Duty Cycle of 95% (typ) at 300kHz
100kHz to 500kHz Synchronizable SYNC Frequency
Range
Configurable UVLO and Soft-Start
Low-Noise, Voltage-Mode Step-Down Converter
Programmable Output-Voltage Slew Rate
● Lossless Constant Current Limit with Fixed
Timeout to Hiccup Mode
Extremely Low-Power Consumption (< 6μA typ) in
Shutdown Mode
20-Pin (5mm x 5mm) Thin QFN Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX15020ATP+
-40°C to +125°C
20 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
PWM
INPUT
IN
ON/OFF
REG
DVREG BST
LX
REFOUT
MAX15020
REFIN
EP SS
FB
SYNC GND FSEL PGND COMP
VOUT
(0.5V TO 36V)
19-0811; Rev 2; 4/14



MAX15020
MAX15020
2A, 40V Step-Down DC-DC Converter with
Dynamic Output-Voltage Programming
Absolute Maximum Ratings
IN, ON/OFF to GND........…. ...................................-0.3V to +45V
LX to GND................................................-0.715V to (VIN + 0.3V)
BST to GND .................................................-0.3V to (VIN + 12V)
BST to LX................................................................-0.3V to +12V
PGND, EP to GND.................................................-0.3V to +0.3V
REG, DVREG, SYNC to GND ................................-0.3V to +12V
FB, COMP, FSEL, REFIN, REFOUT,
SS to GND .........................................-0.3V to (VREG + 0.3V)
Continuous Current through Internal Power MOSFET
TJ = +125°C..........................................................................4A
TJ = +150°C.......................................................................2.7A
Continuous Power Dissipation (TA = +70°C)
20-Pin Thin QFN, single-layer board (5mm x 5mm)
(derate 21.3mW/°C above +70°C)..........................1702.1mW
20-Pin Thin QFN, multilayer board (5mm x 5mm)
(derate 34.5mW/°C above +70°C)..........................2758.6mW
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range ............................-60°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
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.
Electrical Characteristics
(VIN = 36V, VREG = VDVREG, VPGND = VGND = VEP = 0V, VSYNC = 0V, CREFOUT = 0.1μF, TA = TJ = -40°C to +125°C, FSEL = REG,
unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
Input Voltage Range
UVLO Rising Threshold
UVLO Falling Threshold
UVLO Hysteresis
Quiescent Supply Current
VIN
UVLORISING
UVLOFALLING
UVLOHYST
Switching Supply Current
Shutdown Current
ON/OFF CONTROL
ISHDN
Input-Voltage Threshold
Input-Voltage Threshold
Hysteresis
VON/OFF
Input Bias Current
Shutdown Threshold Voltage
VSD
INTERNAL VOLTAGE REGULATOR (REG)
Output Voltage
OSCILLATOR
Frequency
fSW
Maximum Duty Cycle
SYNC/FSEL High-Level
Voltage
SYNC/FSEL Low-Level
Voltage
SYNC Frequency Range
DMAX
fSYNC
CONDITIONS
VIN = 40V, VFB = 1.3V
VIN = 40V, VFB = 0V
VON/OFF = 0.2V, VIN = 40V
VON/OFF rising
VON/OFF = 0V to VIN
IREG = 0 to 20mA
VFSEL = 0V
VFSEL = VREG
VFSEL = 0V
VFSEL = VREG
VFSEL = VREG
MIN
7.5
6.80
6.0
TYP
7.20
6.5
0.7
1.6
14.5
6
MAX
40.0
7.45
7.0
2.8
15
UNITS
V
V
V
V
mA
mA
µA
1.200
-250
1.225
120
1.270
+250
0.2
V
mV
nA
V
7.1 8.3 V
450 550
kHz
270 330
85
%
90
2V
0.8 V
100 550 kHz
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