MAX5033 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter

19-2979; Rev 2; 5/04
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
General Description
The MAX5033 easy-to-use, high-efficiency, high-voltage,
step-down DC-DC converter operates from an input volt-
age up to 76V and consumes only 270µA quiescent cur-
rent at no load. This pulse-width modulated (PWM)
converter operates at a fixed 125kHz switching frequen-
cy at heavy loads, and automatically switches to pulse-
skipping mode to provide low quiescent current and
high efficiency at light loads. The MAX5033 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 protection, and
thermal shutdown.
The MAX5033 delivers up to 500mA 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 MAX5033A/B/C versions have fixed output
voltages of 3.3V, 5V, and 12V, respectively, while the
MAX5033D features an adjustable output voltage, from
1.25V to 13.2V.
The MAX5033 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
47µF
V_IN
BST
R1
ON
R2
OFF
MAX5033
LX
ON/OFF
SGND
FB
VD
GND
0.1µF
220µH
D1
50SQ100
0.1µF
V_OUT
5V, 0.5A
33µF
Features
o Wide 7.5V to 76V Input Voltage Range
o Fixed (3.3V, 5V, 12V) and Adjustable (1.25V to
13.2V) Voltage Versions
o 500mA 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
PART
MAX5033AUSA
MAX5033AUPA
MAX5033AASA
MAX5033BUSA
MAX5033BUPA
MAX5033BASA
MAX5033CUSA
MAX5033CUPA
MAX5033CASA
MAX5033DUSA
MAX5033DUPA
MAX5033DASA
TEMP RANGE
OUTPUT
PIN-
PACKAGE
VOLTAGE
(V)
0°C to +85°C 8 SO
0°C to +85°C 8 PDIP
3.3
-40°C to +125°C 8 SO
0°C to +85°C 8 SO
0°C to +85°C 8 PDIP
5.0
-40°C to +125°C 8 SO
0°C to +85°C 8 SO
0°C to +85°C 8 PDIP
12
-40°C to +125°C 8 SO
0°C to +85°C 8 SO
0°C to +85°C 8 PDIP
ADJ
-40°C to +125°C 8 SO
Pin Configuration
BST 1
VD 2
SGND 3
FB 4
MAX5033
SO/PDIP
8 LX
7 V_IN
6 GND
5 ON/OFF
________________________________________________________________ Maxim Integrated Products 1
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