MAX5035 Maxim, MAX5035 Datasheet
MAX5035
Manufacturer Part Number
MAX5035
Description
1A / 76V / High-Efficiency MAXPower Step-Down DC-DC Converter
Manufacturer
Maxim
Datasheet
1.MAX5035.pdf
(17 pages)
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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 350µA 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. 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
industrial (0°C to +85°C) temperature range.
19-2988; Rev 0; 9/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
7.5V TO 76V
OFF
Consumer Electronics
Industrial
Distributed Power
V
IN
68µF
ON
R1
R2
Typical Operating Circuit
ON/OFF
________________________________________________________________ Maxim Integrated Products
V
SGND
IN
MAX5035
General Description
GND
BST
VD
LX
FB
1A, 76V, High-Efficiency MAXPower
0.1µF
0.1µF
Applications
D1
50SQ100
100µH
Step-Down DC-DC Converter
68µF
V
5V
OUT
o Wide 7.5V to 76V Input Voltage Range
o Fixed (3.3V, 5V, 12V) and Adjustable
o 1A Output Current
o Efficiency Up to 94%
o Internal 0.4Ω High-Side DMOS FET
o 350µA Quiescent Current at No Load, 10µA
o Internal Frequency Compensation
o Fixed 125kHz Switching Frequency
o Thermal Shutdown and Short-Circuit Current
o 8-Pin SO and PDIP Packages
MAX5035AUSA
MAX5035AUPA
MAX5035BUSA
MAX5035BUPA
MAX5035CUSA
MAX5035CUPA
MAX5035DUSA
MAX5035DUPA
(1.25V to 13.2V) Versions
Shutdown Current
Limit
TOP VIEW
PART
SGND
BST
VD
FB
TEMP RANGE
0°C to +85°C
0°C to +85°C
0°C to +85°C
0°C to +85°C
0°C to +85°C
0°C to +85°C
0°C to +85°C
0°C to +85°C
1
2
3
4
Ordering Information
MAX5035
SO/PDIP
Pin Configuration
PIN-
PACKAGE
8 SO
8 PDIP
8 SO
8 PDIP
8 SO
8 PDIP
8 SO
8 PDIP
8
7
6
5
LX
V
GND
ON/OFF
IN
Features
VOLTAGE
OUTPUT
ADJ
(V)
3.3
5.0
12
1
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