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MAX15020ATP+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
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
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
MAX15020
2A, 40V Step-Down DC-DC Converter with
Dynamic Output-Voltage Programming
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
MAX15020
ON/OFF
IN
DVREG
V
OUT
(0.5V TO 36V)
LX
REFOUT
REFIN
EP
SS
PWM
INPUT
V
IN
(7.5V TO 40V)
BST
FB
COMP
SYNC GND FSEL
PGND
REG
Typical Operating Circuit
19-0811; Rev 1; 5/11
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
PART TEMP RANGE PIN-PACKAGE
MAX15020ATP+ -40°C to +125°C 20 TQFN-EP*
Pin Configuration appears at end of data sheet.
EVALUATION KIT
AVAILABLE
MAX15020
2A, 40V Step-Down DC-DC Converter with
Dynamic Output-Voltage Programming
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 36V, V
REG
= V
DVREG
, V
PGND
= V
GND
= V
EP
= 0V, V
SYNC
= 0V, C
REFOUT
= 0.1μF, T
A
= T
J
= -40°C to +125°C, FSEL = REG,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
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.
IN, ON/OFF to GND........…. ...................................-0.3V to +45V
LX to GND................................................-0.715V to (V
IN
+ 0.3V)
BST to GND ..................................................-0.3V to (V
IN
+ 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 (V
REG
+ 0.3V)
Continuous Current through Internal Power MOSFET
T
J
= +125°C..........................................................................4A
T
J
= +150°C.......................................................................2.7A
Continuous Power Dissipation (T
A
= +70°C)
Thin QFN, single-layer board (5mm x 5mm)
(derate 21.3mW/°C above +70°C)...........................1702.1mW
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
Soldering Temperature (reflow) .......................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage Range V
IN
7.5 40.0 V
UVLO Rising Threshold UVLO
RISING
6.80 7.20 7.45 V
UVLO Falling Threshold UVLO
FALLING
6.0 6.5 7.0 V
UVLO Hysteresis UVLO
HYST
0.7 V
Quiescent Supply Current V
IN
= 40V, V
FB
= 1.3V 1.6 2.8 mA
Switching Supply Current V
IN
= 40V, V
FB
= 0V 14.5 mA
Shutdown Current I
SHDN
V
ON/OFF
= 0.2V, V
IN
= 40V 6 15 μA
ON/OFF CONTROL
Input-Voltage Threshold V
ON/OFF
V
ON/OFF
rising 1.200 1.225 1.270 V
Input-Voltage Threshold
Hysteresis
120 mV
Input Bias Current V
ON/OFF
= 0V to V
IN
-250 +250 nA
Shutdown Threshold Voltage V
SD
0.2 V
INTERNAL VOLTAGE REGULATOR (REG)
Output Voltage I
REG
= 0 to 20mA 7.1 8.3 V
OSCILLATOR
V
FSEL
= 0V 450 550
Frequency f
SW
V
FSEL
= V
REG
270 330
kHz
V
FSEL
= 0V 85
Maximum Duty Cycle D
MAX
V
FSEL
= V
REG
90
%
SYNC/FSEL High-Level Voltage 2 V
SYNC/FSEL Low-Level Voltage 0.8 V
SYNC Frequency Range f
SYNC
V
FSEL
= V
REG
100 550 kHz
MAX15020
2A, 40V Step-Down DC-DC Converter with
Dynamic Output-Voltage Programming
_______________________________________________________________________________________ 3
Note 1: Limits are 100% production tested at T
A
= T
J
= +25°C. Limits at -40°C and +125°C are guaranteed by design.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SOFT-START/REFIN/REFOUT/FB
Soft-Start Current I
SS
81526μA
REFOUT Output Voltage 0.97 0.98 1.01 V
REFIN Input Range 0 3.6 V
REFIN = REFOUT 0.97 0.98 1.01 V
FB Accuracy
FB = COMP, V
REFIN
= 0.2V to 3.6V
V
REFIN
- 5mV
V
REFIN
V
REFIN
+ 5mV
mV
FB Input Current V
SS
= 0.2V, V
FB
= 0V -250 +250 nA
Open-Loop Gain 80 dB
Unity-Gain Bandwidth 1.8 MHz
f
SYNC
= 100kHz, V
IN
= 7.5V 9.4
PWM Modulator Gain (V
IN
/
V
RAMP
)
f
SYNC
= 500kHz, V
IN
= 40V 8.9
V/V
CURRENT-LIMIT COMPARATOR
Cycle-by-Cycle Switch Current
Limit
I
ILIM
2.5 3.5 4.5 A
Number of ILIM Events to Hiccup 4
—
Hiccup Timeout 512
Clock
periods
POWER SWITCH
Switch On-Resistance V
BST
- V
LX
= 6V 0.18 0.35 Ω
BST Leakage Current V
BST
= V
LX
= V
IN
= 40V 10 μA
Switch Leakage Current V
IN
= 40V, V
LX
= V
BST
= 0V 10 μA
Switch Gate Charge V
BST
- V
LX
= 6V 10 nC
THERMAL SHUTDOWN
Thermal Shutdown Temperature T
SHDN
+160 °C
Thermal Shutdown Hysteresis 20 °C
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 36V, V
REG
= V
DVREG
, V
PGND
= V
GND
= V
EP
= 0V, V
SYNC
= 0V, C
REFOUT
= 0.1μF, T
A
= T
J
= -40°C to +125°C, FSEL = REG,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX15020ATP+

Mfr. #:
Buy MAX15020ATP+
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 2A 40V Step-Down w/Dynamic Output-V
Lifecycle:
New from this manufacturer.
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