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MAX850ESA Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX850ESA Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 8 page _______________General Description The MAX850–MAX853 low-noise, inverting, charge- pump power supplies are ideal for biasing GaAsFETs in cellular telephone transmitter amplifiers. The MAX850–MAX852 offer both preset (-4.1V) and adjustable (-0.5V to -9.0V) output voltages. The MAX853 uses an external positive control voltage to set the negative output voltage. Input voltage range for all four devices is 4.5V to 10V. Output current is 5mA. An internal linear regulator reduces the output voltage ripple to 2mVp-p. With a well-filtered control voltage (VCTRL), the MAX853 achieves typical output ripple of less than 1mVp-p. Supply current is 3mA max, and shutdown current is less than 1µA max over temperature (5µA max for MAX851). ________________________Applications Cellular Phones Negative Regulated Power Supplies Personal Communicators, PDAs Wireless Data Loggers Continuously Adjustable GaAsFET Bias LCD-Bias Contrast Control ____________________________Features o Fixed -4.1V or Adjustable -0.5V to -9V Output at 5mA o 4.5V to 10V Input Voltage Range o 2mVp-p Output Voltage Ripple (MAX850–MAX852) 1mVp-p Output Voltage Ripple (MAX853) o 100kHz Charge-Pump Switching Frequency (MAX850/MAX851/MAX853) o External Synchronizing Clock Input (MAX852) o Logic-Level Shutdown Mode: 1µA Max Over Temperature (MAX850/MAX852/MAX853) o Low Cost, 8-Pin SO Package Low-Noise, Regulated, Negative Charge-Pump Power Supplies for GaAsFET Bias ________________________________________________________________ Maxim Integrated Products 1 1 2 3 4 8 7 6 5 IN GND OUT FB** (MAX850–852) SHDN* (MAX850/853) NEGOUT C1- C1+ MAX850 MAX851 MAX852 MAX853 SO TOP VIEW * SHDN (MAX851) OSC (MAX852) ** CONT (MAX853) __________________Pin Configuration MAX850 MAX851 MAX852 FB OUT SHDN* SHDN OSC NEGOUT C1- C1+ IN GND VIN = 4.5V to 10.0V (4 CELLS) C3 VOUT = -4.1V (VGG of GaAsFET) C4 C1 C2 * MAX850: SHDN MAX851: SHDN MAX852: OSC __________Typical Operating Circuit 19-0238; Rev 2; 4/96 PART MAX850ISA MAX850ESA -40°C to +850°C -25°C to +85°C TEMP. RANGE PIN-PACKAGE 8 SO 8 SO ______________Ordering Information * Dice are specified at TA = +25°C only. For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 MAX851C/D 0°C to +70°C Dice* MAX851ISA -25°C to +85°C 8 SO MAX851ESA -40°C to +85°C 8 SO MAX852C/D MAX852ISA MAX852ESA -40°C to +85°C -25°C to +85°C 0°C to +70°C Dice* 8 SO ise* 8 SO MAX853C/D 0°C to +70°C Dice* MAX853ISA -25°C to +85°C 8 SO MAX853ESA -40°C to +85°C 8 SO MAX850C/D 0°C to +70°C Dice* EVALUATION KIT MANUAL FOLLOWS DATA SHEET |
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