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MAX833 Dataheets PDF



Part Number MAX833
Manufacturers Maxim
Logo Maxim
Description 5V/3.3V/3V/Adjustable-Output / 1A / Step-Down / PWM / Switch-Mode DC-DC Regulators
Datasheet MAX833 DatasheetMAX833 Datasheet (PDF)

19-0167; Rev 2; 6/95 5V/3.3V/3V/Adjustable-Output, 1A, Step-Down, PWM, Switch-Mode DC-DC Regulators _______________General Description The MAX830/MAX831/MAX832/MAX833 are monolithic, bipolar, pulse-width-modulation (PWM), switch-mode, stepdown DC-DC regulators. Each is rated at 1A. Very few external components are needed for standard operation because the power switch, oscillator, feedback, and control circuitry are all on-chip. Employing a classic buck topology, these regulators perform high-c.

  MAX833   MAX833


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19-0167; Rev 2; 6/95 5V/3.3V/3V/Adjustable-Output, 1A, Step-Down, PWM, Switch-Mode DC-DC Regulators _______________General Description The MAX830/MAX831/MAX832/MAX833 are monolithic, bipolar, pulse-width-modulation (PWM), switch-mode, stepdown DC-DC regulators. Each is rated at 1A. Very few external components are needed for standard operation because the power switch, oscillator, feedback, and control circuitry are all on-chip. Employing a classic buck topology, these regulators perform high-current step-down functions. These regulators have excellent dynamic and transient response characteristics, while featuring cycle-by-cycle current limiting to protect against overcurrent faults and shortcircuit output faults. They have a wide 8V to 30V input range. Outputs for the MAX831/MAX832/MAX833 are fixed at 5V/3.3V/3V, respectively. The MAX830 output is adjustable. Available in 16-pin SO packages, the MAX830–MAX833 have a preset 100kHz oscillator frequency. In addition, the preset current limit and micropower shutdown can be externally controlled. See the MAX724/MAX726 data sheet for more applications information. NUAL KIT MA ATION U EET L H A S V A E T WS DA FOLLO ___________________________Features o Input Range: Up to 30V o 1A On-Chip Power Switch o Adjustable Output (MAX830) Fixed Outputs: 5V (MAX831) 3.3V (MAX832) 3V (MAX833) o 100kHz Switching Frequency o Excellent Dynamic Characteristics o Few External Components o 8mA Quiescent Current o 16-Pin SO Package o Evaluation Kit Available MAX830–MAX833 ______________Ordering Information PART MAX830CWE MAX831CWE MAX832CWE MAX833CWE TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C PIN-PACKAGE 16 Wide SO 16 Wide SO 16 Wide SO 16 Wide SO _______________________Applications Distributed Power from High-Voltage Buses High-Current, High-Voltage Step-Down Applications Multiple-Output Buck Converter __________Typical Operating Circuit __________________Pin Configuration TOP VIEW INPUT 8V TO 30V 100µF VIN VSW 100µH* OUTPUT 5V AT 1A V IN 1 V IN 2 V IN 3 16 V SW 15 V SW 14 V SW MAX831 VC 10k 0.047µF SENSE MBR350 470µF V IN 4 GND 5 I LIM 6 GND 7 (FB) SENSE 8 MAX830 MAX831 MAX832 MAX833 13 V SW 12 GND 11 V C 10 GND 9 SHUT GND Wide SO Tj (MAX) = +125°C, θjA = +55°C/W* ( ) ARE FOR MAX830 * THIS THERMAL RESISTANCE NUMBER IS WITH THE DEVICE WELL MOUNTED ON 1 oz. COPPER WITH THERMAL PASTE BETWEEN THE IC AND THE UNDERLYING GROUND PLANE. LOWER THERMAL RESISTANCE IS POSSIBLE (SEE APPLICATIONS SECTION). STEP-DOWN CONVERTER * CoilCraft DO3316-104 ________________________________________________________________ Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature. 5V/3.3V/3V/Adjustable-Output, 1A, Step-Down, PWM, Switch-Mode DC-DC Regulators MAX830–MAX833 ABSOLUTE MAXIMUM RATINGS Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Switch Voltage with Respect to Input Voltage. . . . . . . . . . . . . . . . 50V Switch Voltage with Respect to GND (VSW negative) (Note 1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V FB/SENSE Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V, +10V SHUT Voltage (not to exceed VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V Note 1: Do not exceed switch-to-input voltage limitation. 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. ILIM Voltage (forced). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V Operating Temperature Range. . . . . . . . . . . . . . . . . . . . . 0°C to +70°C Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . 0°C to +125°C Storage Temperature Range . . . . . . . . . . . . . . . . . . . -65°C to +160°C Lead Temperature (soldering, 10sec). . . . . . . . . . . . . . . . . . . . +300°C ELECTRICAL CHARACTERISTICS (VIN = 25V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Input Supply Voltage Range Switch-On Voltage (Note 2) Switch-Off Leakage ISW = 0.2A ISW = 1A VIN = 25V, VSW = 0V VIN = 30V, VSW = 0V TA = +25°C 8 140 7.3 3.5 1.2 TA = +25°C 85 TA = +25°C Switching Frequency VFB or VSENSE = 0V (Note 6) Switching-Frequency Line Regulation Error-Amplifier Voltage Gain Error-Amplifier Transconductance Error-Amplifier Source Current VFB = 2.0V (MAX830) or VSENSE = 2.0V (MAX831/832/833) VFB = 2.5V (MAX830) or VSENSE = 5.5V (MAX831/832/833) 8V ≤ VIN ≤ 30V 1V ≤ VC ≤ 4V TA = +25°C TA = +25°C TA = +25°C 3000 100 TA = +25°C 90 85 20 0.03 2000 5000 140 9000 225 0.10 %/V V/V µmho µA 1.7 1.2 0.8 90 10.


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