MAX15020 반도체 회로 부품 판매점
Step-Down DC-DC Converter
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 Maxim Integrated Products |
www.DataSheet4U.com
19-0811; Rev 0; 4/07
EVAALVUAAILTAIOBNLEKIT
2A, 40V Step-Down DC-DC Converter with
Dynamic Output-Voltage Programming
General Description
The MAX15020 high-voltage step-down DC-DC con-
verter 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 exter-
nal reference input (REFIN). The MAX15020 consumes
only 6µA in shutdown mode.
The device utilizes feed-forward voltage-mode architec-
ture for good noise immunity in the high-voltage switch-
ing environment and offers external compensation for
maximum flexibility. The switching frequency is selec-
table 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 available 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
Automotive Power Supply
Industrial Power Supply
Step-Down Power Supply
VIN
(7.5V TO 40V)
Features
o Wide 7.5V to 40V Input Voltage Range
o 2A Output Current, Up to 96% Efficiency
o Dynamic Programmable Output Voltage (0.5V to
36V)
o Maximum Duty Cycle of 95% (typ) at 300kHz
o 100kHz to 500kHz Synchronizable SYNC
Frequency Range
o Configurable UVLO and Soft-Start
o Low-Noise, Voltage-Mode Step-Down Converter
o Programmable Output-Voltage Slew Rate
o Lossless Constant Current Limit with Fixed
Timeout to Hiccup Mode
o Extremely Low-Power Consumption (< 6µA typ) in
Shutdown Mode
o 20-Pin (5mm x 5mm) Thin QFN Package
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX15020ATP+
-40°C to +125°C
20 TQFN-EP*
(5mm x 5mm)
T2055-5
+Denotes a lead-free package.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
PWM
INPUT
IN
ON/OFF
REG
DVREG BST
LX
REFOUT
REFIN
EP SS
MAX15020
FB
SYNC GND FSEL PGND COMP
VOUT
(0.5V TO 36V)
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
www.DataSheet4U.com
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
CONDITIONS
Input Voltage Range
UVLO Rising Threshold
UVLO Falling Threshold
UVLO Hysteresis
Quiescent Supply Current
Switching Supply Current
Shutdown Current
ON/OFF CONTROL
VIN
UVLORISING
UVLOFALLING
UVLOHYST
VIN = 40V, VFB = 1.3V
VIN = 40V, VFB = 0V
ISHDN
VON/OFF = 0.2V, VIN = 40V
Input-Voltage Threshold
VON/OFF VON/OFF rising
Input-Voltage Threshold
Hysteresis
Input Bias Current
Shutdown Threshold Voltage
VSD
INTERNAL VOLTAGE REGULATOR (REG)
VON/OFF = 0V to VIN
Output Voltage
OSCILLATOR
IREG = 0 to 20mA
Frequency
Maximum Duty Cycle
SYNC/FSEL High-Level Voltage
fSW
DMAX
VFSEL = 0V
VFSEL = VREG
VFSEL = 0V
VFSEL = VREG
SYNC/FSEL Low-Level Voltage
SYNC Frequency Range
fSYNC
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
2 _______________________________________________________________________________________
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MAX15020 converter
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