MAX5033CASA ,500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC ConverterFeatures Wide 7.5V to 76V Input Voltage Range The MAX5033 easy-to-use, high-efficiency, high-volta ..
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MAX5033DUSA+ ,500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC ConverterFeaturesThe MAX5033 easy-to-use, high-efficiency, high-voltage, ● Wide 7.5V to 76V Input Voltage Ra ..
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MAX5033BUSA-MAX5033CASA-MAX5033DASA
500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter
General DescriptionThe 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.
ApplicationsAutomotive
Consumer Electronics
Industrial
Distributed Power
FeaturesWide 7.5V to 76V Input Voltage Range Fixed (3.3V, 5V, 12V) and Adjustable (1.25V to
13.2V) Voltage Versions500mA Output CurrentEfficiency Up to 94%Internal 0.4ΩHigh-Side DMOS FET270µA Quiescent Current at No Load, 10µA
Shutdown CurrentInternal Frequency CompensationFixed 125kHz Switching FrequencyThermal Shutdown and Short-Circuit Current Limit8-Pin SO and PDIP Packages
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
Ordering Information19-2979; Rev 2; 5/04
Pin Configuration
Typical Operating Circuit
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(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 +12V
MAX5033A/MAX5033B/MAX5033C...................-0.3V to +15V
MAX5033D.........................................................-0.3V to +12V
VOUTShort-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
ELECTRICAL CHARACTERISTICS (MAX5033_U_ _)(VIN= +12V, VON/OFF= +12V, IOUT= 0, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C. See the
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
ELECTRICAL CHARACTERISTICS (MAX5033_U_ _) (continued)(VIN= +12V, VON/OFF= +12V, IOUT= 0, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C. See the
Typical Application Circuit.)
ELECTRICAL CHARACTERISTICS (MAX5033_A_ _)(VIN= +12V, VON/OFF= +12V, IOUT= 0, TA
= TJ= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
ELECTRICAL CHARACTERISTICS (MAX5033_A_ _)(VIN= +12V, VON/OFF= +12V, IOUT= 0, TA
= TJ= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See
Note 1:Switch current at which the current limit is activated.
Note 2:All limits at -40°C are guaranteed by design, not production tested.
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
Typical Operating Characteristics(VIN= 12V, VON/OFF= 12V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical
Application Circuit, if applicable.)
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
Typical Operating Characteristics (continued)(VIN= 12V, VON/OFF= 12V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical
Application Circuit, if applicable.)
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
Typical Operating Characteristics (continued)(VIN= 12V, VON/OFF= 12V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical
Application Circuit, if applicable.)
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
Simplified Block Diagram
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
Detailed DescriptionThe MAX5033 step-down DC-DC converter operates
from a 7.5V to 76V input voltage range. A unique volt-
age-mode control scheme with voltage feed-forward
and an internal switching DMOS FET provides high effi-
ciency over a wide input voltage range. This pulse-
width modulated converter operates at a fixed 125kHz
switching frequency. The device also features automat-
ic pulse-skipping mode to provide low quiescent cur-
rent and high efficiency at light loads. Under no load,
the MAX5033 consumes only 270µA, and in shutdown
mode, consumes only 10µA. The MAX5033 also fea-
tures undervoltage lockout, hiccup-mode output short-
circuit protection, and thermal shutdown.
Shutdown ModeDrive ON/OFFto ground to shut down the MAX5033.
Shutdown forces the internal power MOSFET off, turns
off all internal circuitry, and reduces the VINsupply cur-
rent to 10µA (typ). The ON/OFFrising threshold is
1.69V (typ). Before any operation begins, the voltage at
ON/OFFmust exceed 1.69V (typ). The ON/OFFinput
has 100mV hysteresis.
Undervoltage Lockout (UVLO)Use the ON/OFFfunction to program the UVLO thresh-
old at the input. Connect a resistive voltage-divider
from VINto GND with the center node to ON/OFFas
shown in Figure 1. Calculate the threshold value by
using the following formula:
The minimum recommended VUVLO(TH)is 6.5V, 7.5V,
and 13V for the output voltages of 3.3V, 5V, and 12V,
respectively. The recommended value for R2 is less
than 1MΩ.
If the external UVLO threshold-setting divider is not used,
an internal undervoltage-lockout feature monitors the
supply voltage at VINand allows operation to start when
VINrises above 5.2V (typ). This feature can be used only
when VINrise time is faster than 2ms. For slower VINrise
time, use the resistive divider at ON/OFF.
Boost High-Side Gate Drive (BST)Connect a flying bootstrap capacitor between LX and
BST to provide the gate-drive voltage to the high-side
n-channel DMOS switch. The capacitor is alternately
charged from the internally regulated output-voltage VD
and placed across the high-side DMOS driver. Use a
0.1µF, 16V ceramic capacitor located as close to the
device as possible.
On startup, an internal low-side switch connects LX to
ground and charges the BST capacitor to VD. Once the
BST capacitor is charged, the internal low-side switch
is turned off and the BST capacitor voltage provides
the necessary enhancement voltage to turn on the
high-side switch.
Thermal-Overload ProtectionThe MAX5033 features integrated thermal-overload
protection. Thermal-overload protection limits total
power dissipation in the device, and protects the
device in the event of a fault condition. When the die
temperature exceeds +160°C, an internal thermal sen-
sor signals the shutdown logic, turning off the internal
power MOSFET and allowing the IC to cool. The ther-
mal sensor turns the internal power MOSFET back on
after the IC’s die temperature cools down to +140°C,
resulting in a pulsed output under continuous thermal-
overload conditions.
Applications Information
Setting the Output VoltageThe MAX5033A/B/C have preset output voltages of 3.3V,
5.0V, and 12V, respectively. Connect FB to the preset
output voltage (see the Typical Operating Circuit).
The MAX5033D offers an adjustable output voltage. Set
the output voltage with a resistive voltage-divider con-
nected from the circuit’s output to ground (Figure 1).
Connect the center node of the divider to FB. Choose
R4 less than 15kΩ, then calculate R3 as follows:
Figure 1. Adjustable Output Voltage
