EVALUATION KIT AVAILABLE
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
General Description
The MAX5035 easy-to-use, high-efficiency, high-voltage, step-down DC-DC converter operates from an
input voltage up to 76V and consumes only 270µA quiescent current at no load. This pulse-width modulated
(PWM) converter operates at a fixed 125kHz switching
frequency at heavy loads, and automatically switches
to pulse-skipping mode to provide low quiescent current and high efficiency at light loads. The MAX5035
includes internal frequency compensation simplifying
circuit implementation. The device uses an internal lowon-resistance, high-voltage, DMOS transistor to obtain
high efficiency and reduce overall system cost. This
device includes undervoltage lockout, cycle-by-cycle
current limit, hiccup mode output short-circuit protection, and thermal shutdown.
The MAX5035 delivers up to 1A output current. The output current may be limited by the maximum power dissipation capability of the package. External shutdown is
included, featuring 10µA (typ) shutdown current. The
MAX5035A/B/C versions have fixed output voltages of
3.3V, 5V, and 12V, respectively, while the MAX5035D/E
versions have an adjustable output voltage from 1.25V
to 13.2V.
The MAX5035 is available in space-saving 8-pin SO
and 8-pin plastic DIP packages and operates over the
automotive (-40°C to +125°C) temperature range.
Features
o Wide 7.5V to 76V Input Voltage Range
o Fixed (3.3V, 5V, 12V) and Adjustable
(1.25V to 13.2V) Versions
o 1A Output Current
o Efficiency Up to 94%
o Internal 0.4Ω High-Side DMOS FET
o 270µA Quiescent Current at No Load, 10µA
Shutdown Current
o Internal Frequency Compensation
o Fixed 125kHz Switching Frequency
o Thermal Shutdown and Short-Circuit Current
Limit
o 8-Pin SO and PDIP Packages
Ordering Information
Ordering Information
PART
TEMP RANGE
MAX5035AUSA
0°C to +85°C
OUTPUT
VOLTAGE
(V)
8 SO
0°C to +85°C
MAX5035AUPA
MAX5035AASA
PINPACKAGE
8 PDIP
3.3
-40°C to +125°C 8 SO
MAX5035AASA/V+ -40°C to +125°C 8 SO
Applications
Functional Diagrams
Automotive
MAX5035BUSA
0°C to +85°C
8 SO
MAX5035BUPA
0°C to +85°C
8 PDIP
MAX5035BASA
Consumer Electronics
5.0
-40°C to +125°C 8 SO
MAX5035BASA/V+ -40°C to +125°C 8 SO
/V denotes an automotive qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information continued at end of data sheet.
Industrial
Distributed Power
Typical Operating Circuit
Pin Configuration
VIN
7.5V TO 76V
VIN
68µF
TOP VIEW
BST
0.1µF
100µH
MAX5035
LX
R1
D1
50SQ100
FB
R2
VD
SGND
GND
1
8
LX
VD
68µF
ON
BST
2
7
VIN
SGND
3
6
GND
FB
ON/OFF
OFF
VOUT
5V
4
5
ON/OFF
MAX5035
0.1µF
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
SO/PDIP
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-2988; Rev 5; 5/11
