Datasheet

AVAILABLE
Functional Diagrams
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.
For pricing, delivery, and
ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
EVALUATION KIT AVAILABLE
General Description
The MAX5035 easy-to-use, high-efficiency, high-volt-
age, step-down DC-DC converter operates from an
input voltage up to 76V and consumes only 270µA qui-
escent 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 cur-
rent and high efficiency at light loads. The MAX5035
includes internal frequency compensation simplifying
circuit implementation. The device uses an internal low-
on-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 protec-
tion, and thermal shutdown.
The MAX5035 delivers up to 1A output current. The out-
put current may be limited by the maximum power dis-
sipation 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.
Applications
Automotive
Consumer Electronics
Industrial
Distributed Power
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
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
Ordering Information
19-2988; Rev 5; 5/11
PART TEMP RANGE
PIN-
PACKAGE
OU TPU T
VO LTA GE
( V)
MAX5035AUSA 0°C to +85°C 8 SO
MAX5035AUPA 0°C to +85°C 8 PDIP
MAX5035AASA -40°C to +125°C 8 SO
M AX 5035AAS A/V + -40°C to +125°C 8 SO
3.3
MAX5035BUSA 0°C to +85°C 8 SO
MAX5035BUPA 0°C to +85°C 8 PDIP
MAX5035BASA -40°C to +125°C 8 SO
M AX 5035BAS A/V + -40°C to +125°C 8 SO
5.0
1
2
3
4
BST
VD
SGND
FB
8
7
6
5
LX
TOP VIEW
V
IN
GND
ON/OFF
MAX5035
SO/PDIP
Pin Configuration
MAX5035
GND
BST
LX
V
IN
SGND
FB
D1
50SQ100
VD
100µH
V
OUT
5V
V
IN
7.5V TO 76V
68µF
0.1µF
0.1µF
68µF
ON
OFF
R1
R2
ON/OFF
Typical Operating Circuit
/V denotes an automotive qualified part.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information continued at end of data sheet.
MAX5035
Ordering Information