MAX5035_09 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – 1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter

19-2988; Rev 3; 5/09
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1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
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
features 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.
Automotive
Consumer Electronics
Industrial
Distributed Power
Applications
Typical Operating Circuit
V_IN
7.5V TO 76V
68μF
V_IN
BST
R1
ON
R2
OFF
MAX5035
LX
ON/OFF
SGND
FB
VD
GND
0.1μF
100μH
D1
50SQ100
0.1μF
V_OUT
5V
68μF
Features
♦ Wide 7.5V to 76V Input Voltage Range
♦ Fixed (3.3V, 5V, 12V) and Adjustable
(1.25V to 13.2V) Versions
♦ 1A Output Current
♦ Efficiency Up to 94%
♦ Internal 0.4Ω High-Side DMOS FET
♦ 270µA Quiescent Current at No Load, 10µA
Shutdown Current
♦ Internal Frequency Compensation
♦ Fixed 125kHz Switching Frequency
♦ Thermal Shutdown and Short-Circuit Current
Limit
♦ 8-Pin SO and PDIP Packages
Ordering Information
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
3.3
MAX5035AASA -40°C to +125°C 8 SO
MAX5035AASA/V+ -40°C to +125°C 8 SO
MAX5035BUSA
0°C to +85°C 8 SO
MAX5035BUPA
0°C to +85°C 8 PDIP
5.0
MAX5035BASA -40°C to +125°C 8 SO
MAX5035BASA/V+ -40°C to +125°C 8 SO
+Denotes lead(Pb)-free/RoHS-compliant package.
Ordering Information continued at end of data sheet.
Pin Configuration
TOP VIEW
BST 1
VD 2
SGND 3
FB 4
MAX5035
8 LX
7 V_IN
6 GND
5 ON/OFF
SO/PDIP
________________________________________________________________ Maxim Integrated Products 1
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.