MAX5033

Wide 7.5V to 76V Input Voltage Range
Fixed (3.3V, 5V, 12V) and Adjustable (1.25V to13.2V) Voltage Versions
500mA Output Current
Efficiency Up to 94%
Internal 0.4 High-Side DMOS FET
270A Quiescent Current at No Load, 10A Shutdown Current
Internal Frequency Compensation
Fixed 125kHz Switching Frequency
Thermal Shutdown and Short-Circuit Current Limit
8-Pin SO and PDIP Packages

(Voltages referenced to GND, unless otherwise specified.)
VIN .........................................................................-0.3V to +80V
SGND .....................................................................-0.3V to +0.3V
LX..................................................................-0.8V to (VIN + 0.3V)
BST ................................................................-0.3V to (VIN + 10V)
BST (transient < 100ns).................................-0.3V to (VIN + 15V)
BST to LX..................................................................-0.3V to +10V
BST to LX (transient < 100ns) ..................................-0.3V to +15V
ON/OFF...........................................................-0.3V to (VIN + 0.3V)
VD..........................................................................-0.3V to +12VFB
MAX5033A/MAX5033B/MAX5033C .............................-0.3V to +15V
MAX5033D .................................................................-0.3V to +12V
VOUT Short-Circuit Duration..............................................Indefinite
VD Short-Circuit Duration .................................................Indefinite
Continuous Power Dissipation (TA = +70°C)
8-Pin PDIP (derate 9.1mW/°C above +70°C)....................727mW
8-Pin SO (derate 5.9mW/°C above +70°C).......................471mW
Operating Temperature Range
MAX5033_U_ _ ........................................................0°C to +85°C
MAX5033_A_ _ ...................................................-40°C to +125°C
Storage Temperature Range ..............................-65°C to +150°C
Junction Temperature.........................................................+150°C
Lead Temperature (soldering, 10s) ....................................+300°C

The MAX5033 easy-to-use, high-efficiency, high-voltage, step-down DC-DC converter operates from an input voltage up to 76V and consumes only 270A 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 pulseskipping 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-onresistance, 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 10A (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.