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MAX1790 Dataheets PDF



Part Number MAX1790
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description Low-Noise Step-Up DC-DC Converters
Datasheet MAX1790 DatasheetMAX1790 Datasheet (PDF)

19-1563; Rev 3; 9/05 KIT ATION EVALU LE B A IL A AV www.DataSheet4U.com Low-Noise Step-Up DC-DC Converters General Description Features ♦ 90% Efficiency ♦ Adjustable Output from VIN to 12V ♦ 1.6A, 0.21Ω, 14V Power MOSFET (MAX1790) ♦ 2.4A, 0.15Ω, 14V Power MOSFET (MAX8715) ♦ +2.6V to +5.5V Input Range ♦ Pin-Selectable 640kHz or 1.2MHz Switching Frequency ♦ 0.1µA Shutdown Current ♦ Programmable Soft-Start ♦ Small 8-Pin µMAX Package MAX1790/MAX8715 The MAX1790/MAX8715 boost converters incorpor.

  MAX1790   MAX1790


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19-1563; Rev 3; 9/05 KIT ATION EVALU LE B A IL A AV www.DataSheet4U.com Low-Noise Step-Up DC-DC Converters General Description Features ♦ 90% Efficiency ♦ Adjustable Output from VIN to 12V ♦ 1.6A, 0.21Ω, 14V Power MOSFET (MAX1790) ♦ 2.4A, 0.15Ω, 14V Power MOSFET (MAX8715) ♦ +2.6V to +5.5V Input Range ♦ Pin-Selectable 640kHz or 1.2MHz Switching Frequency ♦ 0.1µA Shutdown Current ♦ Programmable Soft-Start ♦ Small 8-Pin µMAX Package MAX1790/MAX8715 The MAX1790/MAX8715 boost converters incorporate high-performance (at 1.2MHz), current-mode, fixed-frequency, pulse-width modulation (PWM) circuitry with a built-in 0.21Ω/0.15Ω n-channel MOSFET to provide a highly efficient regulator with fast response. High switching frequency (640kHz or 1.2MHz selectable) allows easy filtering and faster loop performance. An external compensation pin provides the user flexibility in determining loop dynamics, allowing the use of small, low equivalent-series-resistance (ESR) ceramic output capacitors. The device can produce an output voltage as high as 12V from an input as low as 2.6V. Soft-start is programmed with an external capacitor, which sets the input-current ramp rate. In shutdown mode, current consumption is reduced to 0.1µA. The MAX1790/ MAX8715 are available in a space-saving 8-pin µMAX® package. The ultra-small package and high switching frequency allow the total solution to be less than 1.1mm high. µMAX is a registered trademark of Maxim Integrated Products, Inc. Ordering Information PART MAX1790EUA MAX1790EUA+ MAX8715EUA MAX8715EUA+ TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 8 µMAX 8 µMAX 8 µMAX 8 µMAX Applications LCD Displays PCMCIA Cards Portable Applications Hand-Held Devices + Denotes lead-free package. Typical Operating Circuit VIN 2.6V TO 5V Pin Configuration TOP VIEW COMP IN ON/OFF SHDN 1 2 3 8 7 SS FREQ IN LX VOUT LX FB SHDN MAX1790 MAX8715 FREQ GND MAX1790 MAX8715 6 5 GND 4 μMAX SS COMP FB ________________________________________________________________ Maxim Integrated Products 1 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. www.DataSheet4U.com Low-Noise Step-Up DC-DC Converters MAX1790/MAX8715 ABSOLUTE MAXIMUM RATINGS LX to GND ..............................................................-0.3V to +14V IN, SHDN, FREQ, FB to GND ................................-0.3V to +6.2V SS, COMP to GND .......................................-0.3V to (VIN + 0.3V) RMS LX Pin Current ..............................................................1.2A Continuous Power Dissipation (TA = +70°C) 8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW Operating Temperature Range MAX1790EUA/MAX8715EUA ........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +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 = SHDN = 3V, FREQ = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Input Supply Range VIN Undervoltage Lockout SYMBOL VIN UVLO VIN rising, typical hysteresis is 40mV, LX remains off below this level MAX1790 Quiescent Current IIN MAX8715 Shutdown Supply Current ERROR AMPLIFIER Feedback Voltage FB Input Bias Current Feedback-Voltage Line Regulation Transconductance Voltage Gain OSCILLATOR Frequency Maximum Duty Cycle N-CHANNEL SWITCH Current Limit ILIM VFB = 1V, duty cycle = 65% (Note 1) MAX1790 MAX8715 VLX = 12V MAX1790 MAX8715 MAX1790 MAX8715 1.2 1.8 1.6 2.4 0.21 0.15 0.01 5 2.3 A 3.4 0.5 0.35 20 30 Ω µA fOSC DC FREQ = GND FREQ = IN FREQ = GND FREQ = IN 540 1000 79 640 1220 85 84 740 1500 92 kHz % gm AV VFB IFB Level to produce VCOMP = 1.24V VFB = 1.24V MAX1790 MAX8715 1.222 1.24 0 125 0.05 70 70 140 160 700 1.258 40 190 0.15 240 240 V nA %/V µS V/V IIN SHDN = GND VFB = 1.3V, not switching VFB = 1.0V, switching VFB = 1.3V, not switching VFB = 1.0V, switching CONDITIONS MIN 2.6 2.25 2.38 0.18 2 0.21 2.5 0.1 TYP MAX 5.5 2.52 0.35 5 0.35 5.0 10 µA mA UNITS V V Level to produce VCOMP = 1.24V, 2.6V < VIN < 5.5V ΔI = 5µA MAX1790 MAX8715 On-Resistance Leakage Current RON ILXOFF 2 _______________________________________________________________________________________ www.DataSheet4U.com Low-Noise Step-Up DC-DC Converters ELECTRICAL CHARACTERISTICS (continued) (VIN = SHDN = 3V, FREQ = GND, TA = 0°C to +85°C, unless otherwise noted. T.


MAX8715 MAX1790 856326


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