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Part: MAX5035
Category:
Power Management
-> DC-DC Converters
-> Step-down
Description: 1a, 76v, High-efficiency Maxpower Step-down DC-DC Converter
Company: Maxim Integrated Products
Datasheet: Download MAX5035 datasheet File size : 371 kB
Request For quote: Find where to buy MAX5035
Datasheet text preview:
19-2988; Rev 0; 9/03
1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter
General Description
The MAX5035 easy-to-use, high-efficiency, high-volta g e , step-down DC-DC converter operates from an input voltage up to 76V and consumes only 350µA 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 pulse-skipping mode to provide low quiescent current and high efficiency at light loads. The MAX5035 includes internal frequency compensation simplifying circuit implementation. The device uses an internal lowon-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 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. o Fixed (3.3V, 5V, 12V) and Adjustable (1.25V to 13.2V) Versions o 1A Output Current o Efficiency Up to 94% o Internal 0.4 High-Side DMOS FET o 350µA 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
Features
o Wide 7.5V to 76V Input Voltage Range
MAX5035
Ordering Information
PART MAX5035AUSA 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 PINPACKAGE 8 SO 8 PDIP 8 SO 8 PDIP 8 SO 8 PDIP 8 SO 8 PDIP OUTPUT VOLTAGE (V) 3.3 5.0 12 ADJ
Applications
Consumer Electronics Industrial Distributed Power
MAX5035AUPA MAX5035BUSA MAX5035BUPA MAX5035CUSA MAX5035CUPA MAX5035DUSA MAX5035DUPA
Typical Operating Circuit
VIN 7.5V TO 76V 68µF VIN BST 0.1µF 100µH LX ON/OFF ON R2 OFF SGND GND FB VD 0.1µF D1 50SQ100
Pin Configuration
MAX5035
R1
VOUT 5V 68µF
TOP VIEW
BST VD SGND FB 1 2 3 4 8 LX VIN GND ON/OFF 7 6 5
MAX5035
SO/PDIP
________________________________________________________________ Maxim Integrated Products
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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.
1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter MAX5035
ABSOLUTE MAXIMUM RATINGS
(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 FB MAX5035A/MAX5035B/MAX5035C ..........-0.3V to +15V MAX5035D .........-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 MAX5035_U_ _ .........0°C to +85°C Storage Temperature Range .....-65°C to +150°C Junction Temperature ......+150°C Lead Temperature (soldering, 10s) .........+300°C
Stresses 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.
ELECTRICAL CHARACTERISTICS
(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.)
PARAMETER SYMBOL MAX5035A Input Voltage Range VIN MAX5035B MAX5035C MAX5035D Undervoltage Lockout UVLO MAX5035A Output Voltage V OUT MAX5035B MAX5035C Feedback Voltage VFB VIN = 7.5V to 76V, IOUT = 20mA to 1A VIN = 7.5V to 76V, IOUT = 20mA to 1A VIN = 15V to 76V, IOUT = 20mA to 1A 3.185 4.85 11.64 1.192 CONDITIONS MIN 7.5 7.5 15 7.5 5.2 3.3 5.0 12 1.221 86 90 94 90 350 350 350 350 460 460 460 460 µA % 3.415 5.15 12.36 1.250 V V TYP MAX 76.0 76.0 76 76.0 V V UNITS
VIN = 7.5V to 76V, MAX5035D VIN = 12V, ILOAD = 0.5A, MAX5035A VIN = 12V, ILOAD = 0.5A, MAX5035B
Efficiency
VIN = 24V, ILOAD = 0.5A, MAX5035C VIN = 12V, VOUT = 5V, ILOAD = 0.5A, MAX5035D VFB = 3.5V, VIN = 7.5V to 76V, MAX5035A VFB = 5.5V, VIN = 7.5V to 76V, MAX5035B VFB = 13V, VIN = 15V to 76V, MAX5035C VFB = 1.3V, MAX5035D
Quiescent Supply Current
IQ
2
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1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter
ELECTRICAL CHARACTERISTICS (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.)
PARAMETER Shutdown Current Peak Switch Current Limit Switch Leakage Current Switch On-Resistance PFM Threshold FB Input Bias Current ON/OFF CONTROL INPUT ON/OFF Input-Voltage Threshold ON/OFF Input-Voltage Hysteresis ON/OFF Input Current OSCILLATOR Oscillator Frequency Maximum Duty Cycle VOLTAGE REGULATOR Regulator Output Voltage Dropout Voltage Load Regulation Thermal Resistance (Junction to Ambient) THERMAL SHUTDOWN Thermal-Shutdown Junction Temperature Thermal-Shutdown Hysteresis TSH THYST +160 20 °C °C VD/IVD PACKAGE THERMAL CHARACTERISTICS JA SO package (JEDEC 51) DIP package (JEDEC 51) 170 110 °C/W VD VIN = 8.5V to 76V, IL = 0mA 7.5V VIN 8.5V, IL = 1mA 0 to 5mA 6.9 7.8 2.0 150 8.8 V V mV/mA fOSC D MAX MAX5035D 109 125 95 135 kHz % VON/OFF V HYST ION/OFF VON/OFF = 0V to VIN Rising trip point 1.53 1.69 100 10 150 1.85 V mV nA SYMBOL IS H D N ILIM IOL RDS(ON) IPFM IB (Note 1) VIN = 76V, VON/OFF = 0V, VLX = 0V ISWITCH = 1A Minimum switch current in any cycle MAX5035D 55 -12 CONDITIONS VON/OFF = 0V, VIN = 7.5V to 76V MIN TYP 10 1.80 1 0.40 85 +0.01 0.80 110 +12 MAX 45 2.40 UNITS µA A µA mA nA
MAX5035
Note 1: Switch current at which current limit is activated.
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