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MAX1676 Dataheets PDF



Part Number MAX1676
Manufacturers Maxim Integrated
Logo Maxim Integrated
Description Step-Up DC-DC Converters
Datasheet MAX1676 DatasheetMAX1676 Datasheet (PDF)

AVAILABLE EVALUATION KIT AVAILABLE MAX1674/MAX1675/MAX1676 High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters General Description The MAX1674/MAX1675/MAX1676 compact, high-efficiency, step-up DC-DC converters fit in small µMAX packages. They feature a built-in synchronous rectifier, which improves efficiency and reduces size and cost by eliminating the need for an external Schottky diode. Quiescent supply current is only 16µA. The input voltage ranges from 0.7V to VOUT, whe.

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AVAILABLE EVALUATION KIT AVAILABLE MAX1674/MAX1675/MAX1676 High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters General Description The MAX1674/MAX1675/MAX1676 compact, high-efficiency, step-up DC-DC converters fit in small µMAX packages. They feature a built-in synchronous rectifier, which improves efficiency and reduces size and cost by eliminating the need for an external Schottky diode. Quiescent supply current is only 16µA. The input voltage ranges from 0.7V to VOUT, where VOUT can be set from 2V to 5.5V. Start-up is guaranteed from 1.1V inputs. The MAX1674/MAX1675/ MAX1676 have a preset, pin-selectable output for 5V or 3.3V. The outputs can also be adjusted to other voltages using two external resistors. All three devices have a 0.3Ω N-channel MOSFET power switch. The MAX1674 has a 1A current limit. The MAX1675 has a 0.5A current limit, which permits the use of a smaller inductor. The MAX1676 comes in a 10-pin µMAX package and features an adjustable current limit and circuitry to reduce inductor ringing. ________________________Applications Pagers Wireless Phones Medical Devices Hand-Held Computers PDAs RF Tags 1 to 3-Cell Hand-Held Devices Functional Diagrams Typical Operating Circuit INPUT 0.7V TO VOUT ON OFF SHDN LX MAX1674 OUT MAX1675 OUTPUT 3.3V, 5V, OR ADJ (2V TO 5.5V) UP TO 300mA LOW-BATTERY DETECT IN LBI LBO REF FB GND LOW-BATTERY DETECT OUT Pin Configuration0s.1µaFppear at end of data sheet. Functional Diagrams continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. ____________________________Features o 94% Efficient at 200mA Output Current o 16µA Quiescent Supply Current o Internal Synchronous Rectifier (no external diode) o 0.1µA Logic-Controlled Shutdown o LBI/LBO Low-Battery Detector o Selectable Current Limit for Reduced Ripple o Low-Noise, Anti-Ringing Feature (MAX1676) o 8-Pin and 10-Pin µMAX Packages o Preassembled Evaluation Kit (MAX1676EVKIT) _______________Ordering Information PART MAX1674EUA MAX1675EUA MAX1676EUB TEMP. RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 8 µMAX 8 µMAX 10 µMAX TOP VIEW Pin Configurations FB 1 LBI 2 LBO 3 REF 4 MAX1674 MAX1675 8 OUT 7 LX 6 GND 5 SHDN µMAX FB 1 LBI 2 LBO 3 CLSEL 4 REF 5 MAX1676 µMAX 10 OUT 9 LX 8 GND 7 BATT 6 SHDN For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. 19-1360; Rev 3; 3/00 MAX1674/MAX1675/MAX1676 High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters ABSOLUTE MAXIMUM RATINGS Supply Voltage (OUT to GND) ..............................-0.3V to +6.0V Switch Voltage (LX to GND) .....................-0.3V to (VOUT + 0.3V) Battery Voltage (BATT to GND).............................-0.3V to +6.0V SHDN, LBO to GND ..............................................-0.3V to +6.0V LBI, REF, FB, CLSEL to GND ...................-0.3V to (VOUT + 0.3V) Switch Current (LX) ...............................................-1.5A to +1.5A Output Current (OUT) ...........................................-1.5A to +1.5A Continuous Power Dissipation (TA = +70°C) 8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW 10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +165°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 (VBATT = 2V, FB = OUT (VOUT = 3.3V), RL = ˙∞, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Minimum Input Voltage Operating Voltage Start-Up Voltage Start-Up Voltage Tempco Output Voltage Output Voltage Range Steady-State Output Current (Note 2) Reference Voltage Reference Voltage Tempco Reference Voltage Load Regulation SYMBOL CONDITIONS VIN TA = +25°C TA = +25°C, RL = 3kΩ (Note 1) VOUT FB = OUT FB = GND IOUT VREF TEMPCO FB = OUT (VOUT = 3.3V) MAX1674, MAX1676 (CLSEL = OUT) MAX1675, MAX1676 (CLSEL = GND) FB = GND (VOUT = 5V) MAX1674, MAX1676 (CLSEL = OUT) MAX1675, MAX1676 (CLSEL = GND) IREF = 0 VREF_LOAD IREF = 0 to 100µA MIN 1.1 3.17 4.80 2 TYP 0.7 0.9 -2 3.30 5 MAX 5.5 1.1 3.43 5.20 5.5 UNITS V V V mV/°C V V 300 420 150 220 180 285 mA 90 1.274 130 1.30 0.024 3 1.326 V mV/°C 15 mV Reference Voltage Line Regulation FB, LBI Input Threshold Internal NFET, PFET On-Resistance LX Switch Current Limit (NFET) .


MAX1675 MAX1676 K2958


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