EVALUATION KIT AVAILABLE
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
General Description Features
The MAX5035 easy-to-use, high-efficiency, high-volt-
Wide 7.5V to 76V Input Voltage Range
age, step-down DC-DC converter operates from an
Fixed (3.3V, 5V, 12V) and Adjustable
input voltage up to 76V and consumes only 270A qui-
(1.25V to 13.2V) Versions
escent current at no load. This pulse-width modulated
(PWM) converter operates at a fixed 125kHz switching 1A Output Current
frequency at heavy loads, and automatically switches
Efficiency Up to 94%
to pulse-skipping mode to provide low quiescent cur-
Internal 0.4 High-Side DMOS FET
rent and high efficiency at light loads. The MAX5035
includes internal frequency compensation simplifying
270A Quiescent Current at No Load, 10A
circuit implementation. The device uses an internal low-
Shutdown Current
on-resistance, high-voltage, DMOS transistor to obtain
Internal Frequency Compensation
high efficiency and reduce overall system cost. This
device includes undervoltage lockout, cycle-by-cycle
Fixed 125kHz Switching Frequency
current limit, hiccup mode output short-circuit protec-
Thermal Shutdown and Short-Circuit Current
tion, and thermal shutdown.
Limit
The MAX5035 delivers up to 1A output current. The out-
8-Pin SO and PDIP Packages
put current may be limited by the maximum power dis-
sipation capability of the package. External shutdown is
Ordering Information
included, featuring 10A (typ) shutdown current. The
Ordering Information
MAX5035A/B/C versions have fixed output voltages of
OUTP UT
3.3V, 5V, and 12V, respectively, while the MAX5035D/E
PIN-
PART TEMP RANGE VOLTA GE
versions have an adjustable output voltage from 1.25V
PACKAGE
( V)
to 13.2V.
MAX5035AUSA 0C to +85C 8 SO
The MAX5035 is available in space-saving 8-pin SO
MAX5035AUPA 0C to +85C 8 PDIP
and 8-pin plastic DIP packages and operates over the
3.3
automotive (-40C to +125C) temperature range.
MAX5035AASA -40C to +125C 8 SO
M AX5035A ASA/ V+ -40C to +125C 8 SO
Applications
MAX5035BUSA 0C to +85C 8 SO
MAX5035BUPA 0C to +85C 8 PDIP
Functional Diagrams
Automotive
5.0
MAX5035BASA -40C to +125C 8 SO
Consumer Electronics
M AX5035B ASA/ V+ -40C to +125C 8 SO
Industrial
/V denotes an automotive qualified part.
Distributed Power
+Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information continued at end of data sheet.
Typical Operating Circuit Pin Configuration
V
IN
7.5V TO 76V
V TOP VIEW
68F IN
BST
0.1F
100H
MAX5035
V
OUT
BST 1 8 LX
LX
R1
5V
D1
50SQ100 VD 2 7 V
IN
MAX5035
ON/OFF
68F
SGND 3 6 GND
ON FB
R2
VD FB 4 5 ON/OFF
OFF SGND GND
0.1F
Pin Configurations appear at end of data sheet.
SO/PDIP
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
19-2988; Rev 5; 5/11
at 1-888-629-4642, or visit Maxims website at www.maxim integrated.com.
AVAILABLEMAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND, unless otherwise specified.) VD Short-Circuit Duration ..............................................Indefinite
V .........................................................................-0.3V to +80V Continuous Power Dissipation (T = +70C)
IN A
SGND ....................................................................-0.3V to +0.3V 8-Pin PDIP (derate 9.1mW/C above +70C)...............727mW
LX.................................................................-0.8V to (V + 0.3V) 8-Pin SO (derate 5.9mW/C above +70C)..................471mW
IN
BST ...............................................................-0.3V to (V + 10V) Operating Temperature Range
IN
BST (transient < 100ns)................................-0.3V to (V + 15V) MAX5035_U_ _ ...................................................0C to +85C
IN
BST to LX................................................................-0.3V to +10V MAX5035_A_ _ ..............................................-40C to +125C
BST to LX (transient < 100ns) ................................-0.3V to +15V Storage Temperature Range .............................-65C to +150C
ON/OFF ..................................................................-0.3V to +80V Junction Temperature......................................................+150C
VD...........................................................................-0.3V to +12V Lead Temperature (soldering, 10s) .................................+300C
FB Soldering Temperature (reflow)
MAX5035A/MAX5035B/MAX5035C ...................-0.3V to +15V Lead(Pb)-free...............................................................+260C
MAX5035D/E ......................................................-0.3V to +12V Containing lead(Pb).....................................................+240C
V Short-Circuit Duration (V 40V)........................Indefinite
OUT IN
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 (MAX5035_U_ _)
(V = +12V, V = +12V, I = 0, T = 0C to +85C, unless otherwise noted. Typical values are at T = +25C. See the
IN ON/OFF OUT A A
Typical Application Circuit.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5035A 7.5 76.0
MAX5035B 7.5 76.0
Input Voltage Range V V
IN
MAX5035C 15 76
MAX5035D/E 7.5 76.0
Undervoltage Lockout UVLO 5.2 V
V = 7.5V to 76V,
IN
MAX5035A 3.185 3.3 3.415
I = 20mA to 1A
OUT
V = 7.5V to 76V,
IN
Output Voltage V MAX5035B 4.85 5.0 5.15 V
OUT
I = 20mA to 1A
OUT
V = 15V to 76V,
IN
MAX5035C 11.64 12 12.36
I = 20mA to 1A
OUT
V = 7.5V to 76V, MAX5035D/E 1.192 1.221 1.250
IN
Feedback Voltage V V
FB
V = 7.5V to 76V, MAX5035E 1.185 1.221 1.250
IN
V = 12V, I = 0.5A, MAX5035A 86
IN LOAD
V = 12V, I = 0.5A, MAX5035B 90
IN LOAD
Efficiency V = 24V, I = 0.5A, MAX5035C 94 %
IN LOAD
V = 12V, V = 5V, I = 0.5A,
IN OUT LOAD
90
MAX5035D/E
V = 3.5V, V = 7.5V to 76V, MAX5035A 270 440
FB IN
V = 5.5V, V = 7.5V to 76V, MAX5035B 270 440
FB IN
Quiescent Supply Current I V = 13V, V = 15V to 76V, MAX5035C 270 440 A
Q FB IN
V = 1.3V, MAX5035D 270 440
FB
V = 1.3V, MAX5035E 340 460
FB
Shutdown Current I V = 0V, V = 7.5V to 76V 10 45 A
SHDN ON/OFF IN
Peak Switch Current Limit I (Note 1) 1.30 1.9 2.50 A
LIM
2 Maxim Integrated